Multi Tech Systems Welder MMV1600 User Manual

MultiMux™

MMV1600/3200 Series

Data/Voice/Fax Priority Statistical

Multiplexer

Owner'sManual

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Owner’s Manual

82020109 Revision J

MultiMux (#MMV1600C) (#MMV3200C)

This publication may not be reproduced, in whole or in part, without prior expressed written permission from Multi-Tech

Multi-Tech Systems, Inc. makes no representations or warranties with respect to the contents hereof and specifically

disclaims any implied warranties of merchantability or fitness for any particular purpose. Furthermore, Multi-Tech

Systems, Inc. reserves the right to revise this publication and to make changes from time to time in the content hereof

without obligation of Multi-Tech Systems, Inc. to notify any person or organization of such revisions or changes.

Record of Revisions

Revision

Description

(4/15/96)

Manual revised with minor editorial comments.

(9/30/96)

Manual revised to include CE Mark and minor editorial

comments. All pages at Revision I.

Manual revised to include new command. All pages at Revision J.

(4/27/97)

(8/07/97)

Patents

This Product is covered by one or more of the following U.S. Patent Numbers: 5.301.274; 5.309.562; 5.355.365;

5.355.653; 5.452.289; 5.453.986. Other Patents Pending.

TRADEMARK

Trademark of Multi-Tech Systems, Inc. are as follows: MultiMux, MultiModem and the Multi-Tech logo.

Multi-Tech Systems, Inc.

2205 Woodale Drive

Mounds View, Minnesota 55112

(763) 785-3500 or (800) 328-9717

Fax 763-785-9874

Tech Support (800) 972-2439

Internet Address: http://www.multitech.com

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Table of Contents

Chapter 1 - Introduction and Description

1.1 Introduction .......................................................................................... 1-1

1.2 About This Manual ............................................................................... 1-1

1.3 Background .......................................................................................... 1-3

1.3.1 Description of Statistical Multiplexing ...................................... 1-4

1.4 Product Description.............................................................................. 1-6

1.5 System Features .................................................................................. 1-10

1.5.1 Voice/Fax ................................................................................ 1-10

1.5.2 Networking .............................................................................. 1-10

1.5.3 Dual Composite Links ............................................................. 1-10

1.5.4 Dynamic Load Balance ........................................................... 1-11

1.5.5 Channel Flexibility ................................................................... 1-11

1.5.6 Flow Control ............................................................................ 1-11

1.5.7 Channel Switching .................................................................. 1-12

1.5.8 Parameter Memory.................................................................. 1-12

1.5.9 Command Modem ................................................................... 1-12

1.5.10 Downline Parameter Loading .................................................. 1-12

1.5.11 Diagnostics .............................................................................. 1-13

1.5.12 Operational Statistics and Auto-Reporting .............................. 1-13

1.5.13 Dynamic Buffering ................................................................... 1-13

1.5.14 Response Time Control........................................................... 1-14

1.5.15 Synchronous Data Channel .................................................... 1-14

1.6 FCC Regulations for Telephone Line In terconnection........................ 1-15

1.7 DOC Terminal Equipment .................................................................... 1-16

1.8 Specifications ....................................................................................... 1-17

1.8.1 Async Channels ...................................................................... 1-17

1.8.2 System Control ........................................................................ 1-17

1.8.3 Composite Link........................................................................ 1-18

1.8.4 Internal DSU ............................................................................ 1-18

1.8.5 Sync Data Channel ................................................................. 1-18

1.8.6 Voice Channel ......................................................................... 1-18

1.8.7 Command Modem ................................................................... 1-19

1.8.8 Electrical/Physical ................................................................... 1-19

1.8.9 Compatibility ............................................................................ 1-20

Chapter 2 - Configuration

2.1 Introduction .......................................................................................... 2-1

2.2 Configuration 1 .................................................................................... 2-2

2.3 Configuration 2 .................................................................................... 2-4

2.4 Configuration 3 .................................................................................... 2-5

2.5 Configuration 4 .................................................................................... 2-8

2.6 Configuration 5 .................................................................................... 2-11

2.7 Configuration 6 .................................................................................... 2-13

2.8 Configuration 7 .................................................................................... 2-15

2.9 Configuration 8 .................................................................................... 2-17

Chapter 3 - Front and Rear Panel Descriptions

3.1 Introduction .......................................................................................... 3-1

3.2 Front Panel .......................................................................................... 3-1

3.3 Back Panel ........................................................................................... 3-5

3.3.1 ON/OFF Switch ....................................................................... 3-5

3.3.2 Power Connector..................................................................... 3-5

3.3.3 2400 BPS Modem Dial-Up Line Connector............................. 3-5

3.3.4 Command Port Terminal/PC Connector ................................. 3-6

3.3.5 Composite Link A Internal DSU Connector ............................. 3-6

3.3.6 Composite Link A External Modem/DSU Connector............... 3-6

3.3.7 Composite Link B Internal DSU Connector ............................. 3-6

3.3.8 Composite Link B External Modem/DSU Connector............... 3-6

3.3.9 Voice/Fax Channel 2 E&M Connector .................................... 3-6

3.3.10 Voice/Fax Channel 2 FXS Connector ..................................... 3-7

3.3.11 Voice/Fax Channel 2 FXO Connector ..................................... 3-7

3.3.12 Voice/Fax Channel 1 E&M Connector .................................... 3-7

3.3.13 Voice/Fax Channel 1 FXS Connector ..................................... 3-7

3.3.14 Voice/Fax Channel 1 FXO Connector ..................................... 3-8

3.4 DIP Switches and Shunt ...................................................................... 3-9

3.4.1 Aggregate Board Switch SW-5 ............................................... 3-10

3.4.2 Channel Board Number of Channels Switch........................... 3-10

3.4.4 V.24/V.35 Shunt ...................................................................... 3-11

Chapter 4 - Installation

4.1 Introduction .......................................................................................... 4-1

4.2 Unpacking ............................................................................................ 4-1

4.3 Installation Procedure .......................................................................... 4-1

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Chapter 5 - Commands

5.1 Introduction .......................................................................................... 5-1

5.2 Command Description ......................................................................... 5-5

5.2.1 General Commands ................................................................ 5-5

5.2.2 Channel Parameter Commands .............................................. 5-9

5.2.3 Composite Link Speed and Clocking Commands ................... 5-16

5.2.4 Additional Composite Link Commands ................................... 5-18

5.2.5 Voice/Fax Commands ............................................................. 5-21

5.2.6 Test Commands ...................................................................... 5-26

5.2.7 Command Modem Commands ............................................... 5-28

Chapter 6 - Operating Procedures

6.1 Introduction .......................................................................................... 6-1

6.2 MultiMux Operating Procedures .......................................................... 6-1

6.3 Voice/FaxOperating Procedures.......................................................... 6-5

6.4 Command Modem Operating Procedures ........................................... 6-7

Chapter 7 - Troubleshooting

7.1 Introduction .......................................................................................... 7-1

7.2 Importance of Composite Statistics ..................................................... 7-1

7.3 Test Cables .......................................................................................... 7-2

7.4 Troubleshooting Guide ........................................................................ 7-3

7.5 Channel Device Testing....................................................................... 7-11

7.6 DSU and Communications Line Testing .............................................. 7-12

7.7 MultiMux Functional Testing Procedures............................................. 7-13

7.8 Voice/Fax Channel Testing.................................................................. 7-14

7.9 Sync Data Channel Testing ................................................................. 7-16

Chapter 8 - Service, Warranty and Tech Support

8.1 Introduction .......................................................................................... 8-1

8.2 Limited Warranty .................................................................................. 8-1

8.3 Tech Support ....................................................................................... 8-2

Appendices

Appendix A ASCII Character Code/Hex/Decimal Conversion Chart ........... A-1

Appendix B RS232C Interface Specification ............................................. B-1

Appendix C Cabling Diagrams ................................................................... C-1

Appendix D Command Modem Commands............................................... D-1

Appendix E Command Modem S-Register Functions ............................... E-1

Appendix F Flow Control Background ....................................................... F-1

Figures

1-1 MultiMux MMV1600 Series .................................................................. 1-1

1-2 Simple Communications Network ........................................................ 1-3

1-3 MultiMux MMV1600/3200 Series Block Diagram ................................ 1-7

2-1 Configuration 1 .................................................................................... 2-2

2-2 Configuration 2 .................................................................................... 2-4

2-3 Configuration 3 .................................................................................... 2-5

2-4 Configuration 4 (FXO to FXS) .............................................................. 2-8

2-5 Configuration 5 (E&M I-V) .................................................................... 2-11

2-6 Configuration 6 (FXS to FXS) .............................................................. 2-13

2-7 Configuration 7 (E&M I-V to FXS) ........................................................ 2-15

2-8 Configuraiton 8 (LAN to LAN) .............................................................. 2-17

3-1 MultiMux Front Panel ........................................................................... 3-1

3-2 Back Panel ........................................................................................... 3-5

3-3 Switches and Shunts ........................................................................... 3-9

3-4 RS232C/V.35 Shunts ........................................................................... 3-11

4-1 Back Panel ........................................................................................... 4-2

4-2 Composite Link Cabling ....................................................................... 4-4

4-3 PC Board Removal .............................................................................. 4-5

4-4 Shunts .................................................................................................. 4-5

7-1 Off Line Test Modes............................................................................. 7-2

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Tables

3-1 LED Indicators ..................................................................................... 3-2

4-1 Cabling Procedure ............................................................................... 4-1

4-2 V.35 Interface....................................................................................... 4-4

4-3 Configuration Procedure ...................................................................... 4-7

5-1 Command Summary ............................................................................ 5-2

6-1 MultiMux Operating Procedures .......................................................... 6-1

6-2 Voice/Fax Operating Procedures......................................................... 6-5

6-3 Command Modem Operating Procedures ........................................... 6-7

7-1 Data Troubleshooting Guide ................................................................ 7-4

7-2 Voice/Fax Troubleshooting Guide ....................................................... 7-8

7-3 Channel Device Testing Procedure ..................................................... 7-11

7-4 DSU and Communications Line Testing Procedure ............................ 7-12

7-5 MultiMux Functional Testing Procedures............................................. 7-13

7-6 Voice/Fax Channel Testing Procedures .............................................. 7-15

7-7 Sync Data Channel Testing Procedure ............................................... 7-16

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1.1

Introduction

Congratulations! Your new MultiMux MMV1600/3200 series is one of the finest statistical multiplexers on the market

today. The MMV1600/3200 series high speed Priority Statistical Multiplexer (PSM) supports up to 16 or 32

asynchronous input channels, two synchronous composite links or a synchronous composite link and a sync data

channel, and two voice/fax channels. The MultiMux is completely software driven and is controlled by you through its

command port. This gives you great flexibility and ease of operation. This Owner’s Manual will help you to install and

use your MultiMux, and also provide you with a valuable information resource in the future.

Figure 1-1. MultiMux MMV1600 Series

1.2

AboutThisManual

This manual is comprised of eight chapters. There are also several appendices at the end of the manual, most of

which is a condensed version of the information contained in the chapters. These appendices can be used as a quick

reference. The information contained in each chapter is as follows:

Chapter 1 - Introduction

This chapter is an introduction to the world of multiplexing. Since you have already acquired the MultiMux, you may

have an extensive background in multiplexing. In which case, this introduction will provide a good review.

Chapter 2 - Configuration

This chapter defines the configurations of the MMV1600/3200 series and provides some typical examples of how the

MultiMux is configured. The MMV1600/3200 series is available in several models; 16 and 32 channel units with

internal command modem, composite link digital service units (DSUs) supporting synchronous communications, and

two optional voice/fax channels. The typical examples explain how the MultiMux can be used in various environments.

Chapter 3 - Front and Back Panel Descriptions

Chapter 3 describes the front panel indicators, the switches and jumpers within the cabinet and the back panel

connections. The front panel indicators are divided into channel, composite link, command modem and voice/fax

channel groups. The back panel provides all the cable connections.

Chapter 4 - Installation

Chapter 4 provides the procedures for unpacking, installing and cabling your MultiMux. After your MultiMux is cabled,

an initial power on procedure is provided for you to display and modify the channel and composite link parameters to fit

your configuration.

Chapter 5 - Commands

The MultiMux is software-driven and controlled through its command port and the supervisory console. This chapter

describes the AT commands and the impact each has on your system’s operation.

Chapter 6 - Operating Procedures

Chapter 6 provides the operational information for your MultiMux. The MultiMux operating procedures address the

channel and composite link parameters. The command modem operating procedures address the command modem

access, dialing, and remote access procedures.

Chapter 7 - Troubleshooting

This chapter is a guide to troubleshooting your MultiMux. It contains a listing of error conditions, probable causes and

suggested fixes or steps designed to isolate the failing unit in your communications network.

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Chapter 8- Service, Warranty and Tech Support

Chapter 8 provides instructions on getting service for the MultiMux at the factory, a statement of the limited warranty,

information about our user bulletin board service, and space for recording information about your multiplexer prior to calling

Multi-Tech's Technical Support.

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1.3

Background

Any data communications environment that has more than one asynchronous line going between common locations

can probably benefit by installing a pair of statistical multiplexers (stat muxes). A stat mux performs the function of

combining several asynchronous data communication channels into one composite synchronous signal that can be

transmitted between two locations more inexpensively than the cost of the individual lines. Figure 1-2 shows a simple

communications network. Individual users connect to asynchronous channels and the composite (or aggregate)

communications line between the two locations is the "link". Link protocol is the communications discipline used

between the two multiplexers and typically operates at a speed higher than the individual asynchronous units

connected to each multiplexer.

Figure 1-2. Simple Communications Network

One reason that a stat mux works is that typically an asynchronous terminal device is not used to its capacity. Studies

show that as little as 10 to 15% utilization of such lines is a common occurrence. These percentages indicate that the

most efficient combination of lines in a muxed asynchronous environment is between four and eight lines.

Although the primary reason for installing a mux is to save on communications costs, two other benefits are also

present. One is the inherent error correction existing in muxed data and the other is data security. Since a mux

functions by taking individual asynchronous data and transmitting it as synchronous data packets, there is an error

detection and retransmission scheme built in. Error correction is so vital in many transmission types, such as graphic

data and program transmission, that many muxes are used mainly for their error correction capabilities. The other

benefit is data security which is achieved by the fact that the individual data streams are encrypted into a single

communication line on one end of the link and then broken up into individual components on the other end. Someone

wishing to "tap" into a muxed signal must not only have the link protocol, which is typically a proprietary version of High

Level Data Link Control (HDLC), but must also know the individual channel assignment schemes and data formats.

1.3.1

Description of Statistical Multiplexing

A statistical multiplexer (also known as a stat mux) is a device that allows several other devices (usually computer

terminals or PCs) to communicate over a single transmission line. Sometimes called concentrators, they take data from

different devices and combine it into a single stream that can be transmitted, via a synchronous modem, to an identical

multiplexer at another location, where the stream is then separated back into its original form. Physically, a mux looks

like a box with a bunch of serial ports and some LEDs. The most typical task of the MultiMux is to connect a group of

PCs or terminals at one site to a mini or mainframe computer at another site via a single set of modems rather than

using individual modems for each PC or terminal.

1.3.1.1

Statistical Multiplexing

Statistical multiplexing is sometimes referred to as statistical time-division multiplexing (STDM). The use of the voice-

grade phone line (or any other communications link) is based not on peak data rates, but on effective (or average) data

rates.

During the peaks, when the sum of the data rates of the channels being served exceeds the data rate of the composite

link, a statistical multiplexer saves the excess data in buffers (in effect, allowing individual channel buffers to expand).

The buffers are emptied as soon as the activity falls off. The proper allocation of buffer space, plus the implementation

of “flow control” and “pacing” techniques to accommodate unusually high peaks, allows the use of composite link

speeds that are less than the sum of the individual channel speeds.

In effect, a statistical multiplexer services only active channels. However, the efficiency thus realized is not the only

benefit of the technique. Because composite link activity need not be synchronized with the activity on the individual

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channels, there is considerable flexibility in the choice of the composite channel protocol and speed. The use of a

synchronous protocol like HDLC provides for error detection and retransmission over the composite link. Thus,

asynchronous terminals, which have no inherent error-recovery capability, can enjoy end-to-end data integrity.

With the implementation of voice and fax information streams into the STDM, an additional technology was needed to

accommodate the time-sensitive nature of voice and fax transmissions. This new technology is called Priority

Statistical Multiplexing™ (PSM) by Multi-Tech. With this new technology, data packets are limited in length and voice

and fax packets are given priority. The length of the data packet is determined dynamically according to the link speed

preserving the time requirements of normal speech and non-error correcting fax transmissions.

1.3.1.2

Communications

The basic functions of multiplexing are to make communications more efficient, to provide a means of improving

accuracy of asynchronous communications by using synchronous techniques, and to improve data security by

encrypting several data streams into one coded link. Communications using the MMV1600/3200 can be point-to-point

or multipoint. In point-to-point, a MultiMux at a host site is connected to a MultiMux at a remote site. Communications

which you need to concern yourself with include those between the two MultiMuxes designed to carry the data traffic

(composite link), the command modem communications between sites used to control both locations from one location

and any communications between terminals and computers connected to the MultiMuxes.

The channel devices can be any asynchronous RS232 compatible units, from “dumb terminals” to personal computers

running asynchronous communications software. The connection between the channel devices and the MultiMux is

made through an RS232 interface cable. Asynchronous modems (long haul or short haul), asynchronous modem

emulators and asynchronous line drivers (DCE devices) can be used in this connection (up to 19.2K bps) to extend the

distance between the channel devices and the MultiMux. Due to the channel switching feature of the MultiMux,

channels can be switched to any channels on the remote end. This adds considerable flexibility to your point-to-point

communications. You cannot interconnect channels on the same local MultiMux unit.

The connection between the two MultiMuxes is the composite link with a Data Service Unit (DSU) providing the

interface between the MultiMux and the Digital Data Service (DDS) or dedicated network. The composite data link is

full-duplex and synchronous using HDLC protocol. The composite link can use either dedicated (leased) or DDS lines.

In addition to the internal DSU's available on the MMV1600/3200, you can use any compatible external DSU or

modem. The internal DSU processes serial synchronous digital data over a DDS network, or other four wire unloaded

twisted-pair wiring system. Data transmission on the composite link starts at 2400 bps, doubles to 4800, 9600, 19,200

and finally to 56,000 bps in multipoint and point-to-point applications.

1.4

Product Description

The MultiMux MMV1600/3200 series is available in two basic models: a 16 channel or 32 channel unit with internal

command modem, optional composite link DSUs and two optional voice/fax channels. The MMV1608 MultiMux can

connect up to eight async devices and the MMV1616 up to 16 async devices to its asynchronous channels that transfer

data at speeds up to 19.2K bits per second (bps). The MMV3200 series can connect up to 32 async devices to its

channels. The command modem allows you to configure your async channels, composite link, origin and destination of

the voice channels, and the voice mode of operation. The composite link can be configured for either one or two

internal Digital Service Units (DSUs) or equivalent external DSUs or modems for digital communications over a Digital

Data Service (DDS) or dedicated network. The voice/fax channels allow voice and fax traffic over the same composite

link without the need for a separate voice network.

The MMV1600/3200 series has three types of pc boards; the main pc board is called the aggregate pc board, the board

that interfaces to the asynchronous channel devices is the channel board, and the third pc board is the voice/fax board

that connects to the telephone and fax equipment. A simplified block diagram of a MultiMux is shown in Figure 1-3.

The aggregate pc board is in the center of the figure and connects the other two pc boards. The aggregate board is

the mind of the MultiMux; that is, it provides the control and data paths from the channel devices and the voice and fax

traffic from the telephone equipment and fax machines to the composite link and on to the remote location. This board

also provides the interface to the command port for the supervisory console and the command modem interface.

The channel board provides the interface to the asynchronous devices such as pcs, printers, modems, if a device is

remote, and work stations. Each channel board connects up to eight devices to the MultiMux. An MMV1608 MultiMux

has one channel board, MMV1616 has two channel boards to connect up to 16 devices and the maximum is 32 devices

on a MMV3232 MultiMux. The channel board is connected to the aggregate board by two ribbon cables that carry data

and control information between the aggregate board and the channels. Any device with a serial interface can be

connected to a channel board. Each channel board has eight RS232C connectors to connect to the devices.

The voice/fax board connects telephone and fax type equipment to the MultiMux for transmission over the composite

link to a remote location. This board takes the analog voice or fax traffic and converts it to digital information for use by

the aggregate board. Digitized voice or fax traffic from the remote location can also be converted to analog signals and

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received by the local telephone or fax machine. The voice/fax board has two identical voice/fax channels. Each

channel can connect to a private branch exchange (PBX, a small telephone switch), a telephone or fax machine. Each

channel has three connectors labeled E&M, FXO and FXS. The E&M (Ear and Mouth) connection is for connecting to

the E&M trunk side of a PBX. The FXO (Foreign Exchange Office) connection is to the station side of a PBX and

assumes that an FXS (Foreign Exchange Station) connection is made at the remote location. The type of voice/fax

connection depends on the

Figure 1-3. MultiMux MMV1600/3200 Series Block Diagram

application of the MultiMux. That is, if both the local and remote MultiMuxes are connected to the E&M trunk side of

the PBXs, then the E&M connection is used. If the local MultiMux is connected to a local PBX and only one instrument

(telephone set or fax machine) at the remote location, then the FXO connection is used. The local FXO connection is

to the station side of the PBX and the remote instrument is connected to the FXS connection. The FXO connection to

the PBX uses a station number on the PBX. The local FXO connection accepts the ringing voltage from the PBX and

the remote FXS connection outputs a ringing voltage. If the application is to have a dedicated instrument at both

locations, then the FXS connection is used. When the calling instrument goes off hook in a FXS connection, the called

instrument rings and the voice conversation begins or the fax transmission starts.

To setup a MultiMux MMV1600/3200 series, the async devices have to be connected to the channels, the telephone

and fax machines connected to the voice/fax channels, and the composite link(s) connected to the public data network

(PDN). The MultiMux then needs to be configured for the channel devices, the origin and destination of the voice

channels and the mode of operation for the voice channels, and the composite links for synchronous and full duplex

communication over a DDS or dedicated network. The async devices are connected to CHANNEL 1 through CHANNEL

8 connectors on the back panel of the MultiMux MMV1608 with RS232 cables. The MultiMux MMV1616 has eight

additional channel connectors for connecting up to 16 devices.

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When the voice/fax board is used, connections can be made for either channel 1 or channel 2 or both channels and the

types of connections are the same for both channels. If a PBX is being used at both the local and remote locations and

an E&M trunk connection is desired, then the E&M connections are used for the desired channels. If a PBX is being

used at the local location and a dedicated instrument (telephone or fax machine) is used at the remote location, then

the FXO connection is made to the station side of the PBX and the remote location is connected to the FXS connector

on the back panel of the remote MultiMux. If a dedicated instrument is being used at the both the local and remote

locations for either voice or fax communications over the composite link, then the FXS connection is used.

The composite links need to be connected to a PDN either with internal 56K bps DSUs or equivalent external DSUs or

synchronous modems. If both composite links are being used, they both have to be connected to the PDN. The

internal DSUs are connected to the PDN through the COMPOSITE LINK A or B INTERNAL DSU connector on the back

panel. External DSUs or modems are connected to the PDN by the COMPOSITE LINK A or B EXTERNAL MODEM/

DSU connector on the back panel and if the DSU or modem is V.35 compatible, the shunt on the aggregate board

needs to be moved from the RS232C position to the V.35 position. There is a shunt for composite link A and composite

link B.

The supervisory console is connected to the aggregate board through the COMMAND PORT connector on the back

panel. The supervisory console connection is also an RS232 connection. This completes a typical hardware setup for

a MultiMux. Now the MultiMux has to be configured to talk to the channel devices and communicate over the

composite link.

Configuration of a MultiMux is accomplished through a combination of setting DIP switches behind the front panel and

software commands entered through the supervisory console. The DIP switches determine whether the MultiMux is an

eight, sixteen, twenty-four or thirty-two channel multiplexer, whether the composite link devices are internal DSUs or

external devices, whether or not the command modem will accept remote access, etc. The DIP switches control the

hardware setup and the operating setup is controlled through software commands. The software commands are

entered at a terminal connected to the COMMAND PORT which are transferred to either the command processor or

command modem in the MultiMux. The software commands are AT commands that configure the channel devices to

communicate with the MultiMux and configure the composite link devices to communicate with the PDN. To configure

a channel device, the correct channel speed has to be established, number of data and stop bits in a word determined,

the type of flow control used and whether or not pacing is active. These are just some of the AT commands that are

used to configure the channel devices.

When the MultiMux MMV1600/3200 series is powered up, the command processor transfers the stored configuration of

the channel devices to the data processor. The data processor takes the configuration information and configures each

channel for its particular conditions. The composite link has to be configured for its parameters before data can be

transferred.

The composite link parameters are determined by more than just AT commands transferred to the command processor.

The composite link parameters are determined by what type of device is used, whether it is internal or external, speed,

what type of remote multiplexer we are communicating with and a number of line conditioning parameters. The type of

device used as the composite link device is determined by whether the device is internal or external which is

established by DIP switch settings and by the type of device installed in the MultiMux or connected to the EXTERNAL

COMPOSITE LINK RS232C/V.35 connector on the back panel. If an internal composite link DSU is installed in the

MultiMux, the DIP switch would be set for an internal composite link DSU and a DSU speed select AT command

($DSUA/BSPxxxxx) would determine the operational speed of the DSU. The MultiMux MMV1600/3200 series is now

ready to transfer data from its async devices through an internal composite link DSU.

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1.5

System Features

1.5.1

Voice/Fax

With the addition of the voice/fax board into the MultiMux, you now can have voice and fax traffic along with your

normal data communications on the same composite link. The two voice/fax channels provide all the necessary

interfaces to access a private branch exchange (PBX, a small telephone switch) and all the services provided by the

PBX. If a voice/fax channel is connected to the trunk side of the PBX, the remote location has free access to the local

public switched telephone network (PSTN). With the addition of voice/fax, a free voice or fax communication can be

established on top of the data communication over the same leased data communications network.

1.5.2

Networking

The networking feature adds the capability to design complex networks, it also meets a very basic need: saving phone

line costs. Networking MultiMuxes allows the stringing of several MultiMux units together via dual composite links,

using "pass-through" channel connections, to any MultiMux in a multinode network. The MultiMux checks for a code

that will instruct it to receive the data or pass it on to the next node. Each composite link on a mux can establish

rerouted connections with up to four other muxes in a network. Voice/fax channels must currently be connected point-

to-point. However, voice/fax channel networking will be available as a future enhancement.

1.5.3

Dual Composite Links

The composite links of the MultiMux are capable of synchronous and full duplex communications over a digital data

services (DDS) or dedicated network. The MultiMux has two composite links in which either integral 56K bps DSUs or

equivalent external DSUs or synchronous modems can be connected. With dual composite links, another feature is

added to the MultiMux in the way of networking. Networking MultiMuxes allows the stringing of several MultiMux units

together via their composite links. This feature allows data to be routed over the composite links using pass-through

channel connection to any MultiMux in the multinode network. The MultiMux checks for a code that will instruct it to

receive the data or pass it on to the next node. Each composite link on a mux can establish rerouted connections with

up to four other muxes in a network.

1.5.4

Dynamic Load Balance

A feature of MultiMux MMV1600/MMV3200 series multilink multiplexers is their ability to balance data flow between two

composite links to utilize each to its maximum efficiency. To activate the feature you select D (for dynamic) as the

composite link for each channel using the MLD command. At that point the MultiMux processor picks the least busy

link for transmission. This feature can only be used in a point-to-point network using two MultiMuxes.

1.5.5

Channel Flexibility

The MultiMux permits a great deal of flexibility in configuring channel parameters. You can mix up channel options,

including speed, word length, stop bits, parity, flow control, pacing methods, echo and pass-through. Channel control

commands let you change single channels or all channels with a single command. By using the downline loading

capability or the command modem, channels can be configured at the other end of the network.

1.5.6

Flow Control

Flow control regulates the volume of data entering the buffers. When a particular channel buffer is almost full, a flow

control command is issued which stops further activity until the buffer is emptied. The most common flow control

methods currently used are Xon/Xoff, RS232C signal control (using DTR or CTS) and ENQ/ACK. The MultiMux

supports all three.

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MUX INITIATED

FLOW CONTROL

CHANNEL DEVICE

INITIATED PACING

DATA

Channel

Device

Channel

Device

Mux

Pacing stops the output

of data from the mux

Flow control stops the

input of data to the mux

1.5.7

Channel Switching

A feature of the MultiMux MMV1600/MMV3200 series is its ability to switch channels between mux units. That is, an

individual channel on a source node can be switched to any channel on its destination node. The only restriction on

channel switching is that the channel can only pass thoroughly six nodes on its way to its destination. Channel

switching adds flexibility to the MultiMux by allowing you to build networks matched to your user needs.

1.5.8

Parameter Memory

A nonvolatile memory for storing configurations and options means that the MultiMux remains configured until you

change it. Using this feature, you can configure a MultiMux and save the parameters to memory, turn it off, ship it and

use it without having to reconfigure it.

1.5.9

Command Modem

The MultiMux can connect to a dial-up phone network through an integral 2400/1200/300 bps V.22bis-compatible

modem called the “command modem”. The command modem is an asynchronous modem used for remote

configuration of the mux. The command modem is not to be confused with the “link modem”, which is either an internal

or external synchronous device handling the data transfers over the composite link between two muxes.

By using the command modem, you get the equivalent of a remote Command Port console. Your MultiMux can be

dialed into from a remote location for remote testing and configuration. The command modem will automatically answer

incoming calls.

1.5.10

Downline Parameter Loading

Operational parameters for both the local and remote MultiMux units can be set from one location. The MMV1600/3200

series can downline load parameters for the data channels, but not for the voice/fax channels. Data channel

parameters can be downline loaded to the MMV1600/MMV3200, MMH1600/MMH3200 and the MMH900 series units.

When power is first applied (or a Reset command is executed) to the local or remote MultiMux, operational parameters

are automatically sent over the composite link to the remote MultiMux. For this function to work, the 8-position DIP

switch SW1 on the local (sending) MultiMux must be set to the OPEN position and on the remote (receiving) MultiMux

the 8-position DIP switch SW1 must be set to the CLOSED position.

1.5.11

Diagnostics

Diagnostics in a multiplexer network are of considerable importance. When a multiplexer fails there is not just one

operator down, but many. That is why the MultiMux is equipped with several diagnostic modes that will test every

aspect of the network. The diagnostics include easy-to-execute tests for each channel, the composite link and for

various components of the MultiMux unit itself. There are ten different test modes to ensure error free operation. They

include Local and Remote Digital Loop tests, switch and LED tests, Nonvolatile Memory test, three other tests, a

“Watch-dog Timer” reset test, and the voice/fax loopback test.

1.5.12

Operational Statistics and Auto-Reporting

Operational statistics provides the activity report for the MultiMux network, and Auto-Reporting provides a means to

report on these statistics through the supervisory console on a set periodic time cycle. Statistics such as receive-block

errors pinpoint modem or line problems, and flow control time totals indicate channel devices being set at excessive

speeds. Two simple commands are all that is necessary to select statistical reporting and time cycle. If your command

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port is also connected to a printer, the reports can provide an easy means of generating data for better network

management.

1.5.13

Dynamic Buffering

A basic requirement of all muxes is some sort of buffering capability to temporarily hold channel data while it is being

assembled into a block. In the early days, a mux was sometimes judged by the size of its buffers. Large buffers are

unnecessary in newer designs that include sophisticated dynamic buffer allocation techniques where the amount of

buffer per channel is assigned on an as-needed basis.

In the MultiMux, each channel is assigned 1K of buffer, but in the case where more buffer is needed, the MultiMux will

start assigning additional buffers from the channels not requiring it. In this way a single channel can have up to 8K of

buffer if required. When dynamic buffering is combined with efficient flow control and the automatic transmission of

data from each channel at set intervals, as in the MultiMux, very smooth operation for each user is the result.

1.5.14

Response Time Control

Response time control is the technique used by a mux to make sure that no user experiences undue delays in

performance due to a specific channel using too much link time. This can occur if one of the channels is performing a

high volume batch function, such as a print dump or program transfer.

There are a variety of priority control (response time) schemes in use by different mux vendors. Some vendors use a

switch selection approach where each channel can be given a high, medium or low setting with the low used for those

channels requiring higher volume batch transfers. There are also software-sensing response time techniques where the

microprocessor actually monitors channel activity, and when a high volume is sensed, that channel is given a lower

priority so it will not crowd out the others.

The MultiMux response time control method is one where data is transferred from each channel on a timed basis while

limiting the amount sent with each transmission.

This insures that interactive users will not experience undue delays but, on the other hand, batch activity can still be

accommodated. This, combined with a Response Time command and the ability to shut off channels not being used,

gives the MultiMux a very efficient priority control system.

1.5.15

Synchronous Data Channel

The synchronous data channel feature allows synchronous data to be multiplexed along with the async data and voice.

For example, this feature allows a LAN bridge to be connected to the synchronous data channel and transfer LAN data

along with the normal MultiMux async data and voice/fax services over the high speed composite link. The

synchronous data channel feature supports synchronous HDLC protocols up to 128K bps.

With this feature, composite link B is converted to a synchronous data channel (port B) to which the sync device is

connected. The sync data channel is controlled by commands for speed and clocking that allow the synchronous data

to flow smoothly along with the async data and the voice/fax traffic. The three types of data are prioritized so that the

quality of voice/fax transmissions, the timeliness of synchronous data, and the integrity of asynchronous data are all

preserved.

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1.6

FCC Regulations for Telephone Line Interconnection

1. This equipment complies with Part 68 of the FCC rules. On the outside surface of this equipment is a label that contains, among

other information, the FCC registration number and ringer equivalence number (REN). If requested, this information must be provided

to the telephone company.

2. A suitable jack (USOC connecting arrangement) for this equipment is shown. If applicable, the facility interface codes (FIC) and

service order codes (SOC) are described.

3. The ringer equivalence number (REN) is used to determine the quality of devices which may be connected to the telephone line.

Excessive REN’s on the telephone line may result in the devices not ringing in response to an incoming call. In most, but not all

areas, the sum of the REN’s should not exceed five (5.0). To be certain of the number of devices that may be connected to the line,

as determined by the total REN’s, contact the telephone company to determine the maximum REN for the calling area.

4. If this equipment causes harm to the telephone network, the telephone company will notify you in advance. But if advance notice

isn’t practical, the telephone company will notify the customer as soon as possible. Also, you will be advised of your right to file a

complaint with the FCC if you believe it is necessary.

5. The telephone company may make changes in its facilities, equipment, operations, or procedures that could affect the operation of

the equipment. If this happens, the telephone company will provide advance notice in order for you to make necessary modifications

in order to maintain uninterrupted service.

6. If trouble is experienced with this equipment (the model of which is indicated below) please contact Multi-Tech Systems, Inc. at the

address shown below for details of how to have repairs made. If the trouble is causing harm to the telephone network, the telephone

company may request you remove the equipment from the network until the problem is resolved.

7. No repairs are to be made by you. Repairs are to be made only by Multi-Tech Systems or its licensees. Unauthorized repairs void

registration and warranty.

8. This equipment cannot be used on public coin service provided by the telephone company. Connection to Party Line Service is

subject to state tariffs. (Contact the state public utility commission, public service commission or corporation commission for

information.)

9. If so required, this equipment is hearing aid compatible.

Manufacturer:

Model Number:

Multi-Tech Systems, Inc.

#MMV16XXC/56/56/V

#MMV32XXC/56/56/V

FCC Registration Number: AU7USA-18883-DE-N (DSU)

AU7USA-20328-MD-E

Ringer Equivalence:

Modular Jack (USOC)

0.3B (Command modem)

RJ11C or RJ11W (single line)

Service Center in U.S.A. Multi-Tech Systems Inc.

2205 Woodale Drive

Mounds View, MN 55112 USA

(612) 785-3500 or (800) 328-9717

U.S. Fax (612) 785-9874

1.7

DOC Terminal Equipment

Notice: The Canadian Department of Communications label identifies certificated equipment. This certification means

that the equipment meets certain telecommunications network protective, operational and safety requirements. The

department does not guarantee the equipment will operate to the user’s satisfaction.

Before installing this equipment, users should ensure that it is permissible to be connected to the facilities of the local

telecommunications company. The equipment must also be installed using an acceptable method of connection. In

some cases, the company’s inside wiring associated with a single line individual service may be extended by means of

a certified connector assembly (telephone extension cord). The customer should be aware that compliance with the

above conditions may not prevent degradation of service in some situations.

Repairs to certified equipment should be made by an authorized Canadian facility designated by the Supplier. Any

repairs or alterations made by the user to this equipment; or equipment malfunctions, may give the telecommunications

company cause to request the user to disconnect the equipment.

Users should insure for their own protection that the electrical ground connections of the power utility, telephone lines

and internal metallic water pipe system, if present, are connected together. This precaution may be particularly

important in rural areas.

Caution: Users should not attempt to make such connections themselves, but should contact the appropriate electric

inspection authority, or electrician, as appropriate.

The Load Number (LN) assigned to each terminal device denotes the percentage of the total load to be connected to a

telephone loop which is used by the device, to prevent overloading. The termination on a loop may consist of any

combinations of devices subject only to the requirement that the total of the Load Numbers of all the devices does not

exceed 100. The load number for the Command Modem is 7.

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1.8

Specifications

1.8.1

Async Data Channels

Number of Channels

Up to sixteen (#MMV16XXC), or

up to thirty-two (#MMV32XXC)

19,200 bps

Maximum Speed

All Channels

Channel Speeds

Data Format

Parity

All standard speeds from 300 bps to 19.2K bps

Asynchronous: 5, 6, 7, or 8 data bits, with 1,1.5, or 2 stop bits

Odd, even, or none

Local Echo

Flow Control

Pacing

On or off selectable for each channel

Xon/Xoff, CTS on/off, or HP ENQ/ACK selectable for each channel

On or off selectable for each channel, DTR on/off, or Xon/Xoff

RS232C/CCITT V.24; 25-pin female D connectors

Interface

1.8.2

System Control

Local Access

Through MultiMux’s RS232C “Command Port”

Remote Access

Through MultiMux’s internal dial-up CCITT V.22bis/V.22, Bell 212A/103 (2400/1200/300

bps) command modem Device

Any asynchronous keyboard terminal, PC in terminal mode (local access), or any standard

dial-up 2400/1200/300bps V.22bis/V.22, 212A/103 modem (remote access)

Menu-driven/help screen approach. Commands to select channel speeds, flow

control methods, listing of parameters, help screens, storing of configurations, downline

loading, status reporting, echo controls, resets, pacing, parity, stop bits, response time

priorities, test modes, modem configurations, and other parameters.

Memory tests, Local and Remote Digital Loop tests, Switch test, LED test, Non-Volatile RAM

test, Watchdog Timer, and Voice/fax Channel Loopback test.

Command Functions

Diagnostics

1.8.3

Composite Link

Number of Links

Data Format

Link Speeds

Link Protocol

Error Correction

Interface

Two (Links A and B)

Synchronous

Up to 256K bps

Proprietary modified HDLC

16-bit CRC block check with ARQ

RS232C/CCITT V.35/V.24, or use MultiMux integral DSU

1.8.4

Internal DSU:

Description

Integral card DSU, synchronous and full duplex over DDS network, 4-wire non-loaded

metallic wire pairs or LADS (Local Area Data Set) at transmission speeds of 2400,4800, 9600,

19,200 or 56,000 bps

Line Interface

DDS interface with a RJ48S 8-position keyed jack

1.8.5

Sync Data Channel

Number of Channels

Data Format

Channel Speed

One (Port B)

Synchronous

Up to 128K bps

Channel ProtocolAny Synchronous HDLC

Interface RS232C/CCITT V.35/V.24; 25-pin male D connector

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1.8.6

Voice Channels

Number of Channels

Two independent channels

Voice Digitization Rates 9600 and 16K bps

Automatic Fax

Modulation/

Demodulation

Interfaces

Group 3 Fax Rates

(2400, 4800, 7200 and 9600)

E&M 2 and 4 wire, FXS, FXO

Signaling

DTMF

Line Interface

RJ48 Jack for E&M and RJ11 Jacks for FXS and FXO

1.8.7

Command Modem:

Description

Bell 212A/103 & CCITT V.22bis/V.22 compatible asynchronous, full duplex over dial-

up lines

Speeds

Line Interface

2400, 1200 and 0-300 bps

RJ11C jack for dial-up line

1.8.8

Electrical/Physical:

Voltage

115 volts AC (standard), 240 volts AC (optional)

47 to 63 Hz

50 watts (16 channel), 57 watts (32 channel)

3AG, 1 Amp S/B (slo-blo)

Frequency

Power Consumption

Fuse

Dimensions

6.7" high x 15.1" wide x 13" deep (MMV16xx)

17 cm high x 38.4 cm wide x 33cm deep

10" high x 15.1" wide x 13" deep (MMV32xx)

25.4 cm high x 38.4 cm wide x 33 cm deep

24 pounds (10.9kg) (MMV16xx)

Weight

30 pounds (13.6kg) (MMV32xx)

1.8.9

Compatibility

Communicate With

MMH1600/MMH3200 and MMH900 Series for data only and MMV800 Series for data and

voice/fax communications.

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2.1

Introduction

The MultiMux MMV1600/MMV3200 Series is available in two models, a sixteen and thirty-two channel unit with an

internal command modem, optional composite link DSUs and two optional voice/fax channels, dial-up capability from a

remote location into the command modem and a command port for local AT command configuration information.

The MultiMux MMV1600/MMV3200 Series is capable of communicating with Multi-Tech's MultiMux MMH1600/

MMH3200 Series and the MultiMux MMH900 Series for data communications.

The configuration of the MultiMux MMV1600/MV3200 series is as follows:

Model

Description

MMV1608C

MMV1616C

MMV3208C

MMV3216C

MMV3224C

MMV3232C

MMVXXXXC/56

MMVXXXXC/56/56

MMVXXXXC/V

MMVXXXXC/56/V

MMVXXXXC/56/56/V

Eight channel unit with internal command modem

Sixteen channel unit with internal command modem

Eight channel unit with internal command modem

Sixteen channel unit with internal command modem

Twenty-four channel unit with internal command modem

Thirty-two channel unit with internal command modem

Internal 56K bps composite link DSU

Two internal 56K bps composite link DSUs

Two internal voice/fax channels

Internal 56K bps composite link DSU and two internal voice/fax channels

Two internal 56K bps composite link DSUs and two voice/fax channels

Valid voice/fax configurations are as follows:

Configuration

Description

E&M to E&M

FXS to FXS

FXS to FXO

Any phone or fax machine connected to the PBX at one site can call any phone or fax

machine connected to a PBX at the other end.

No number needs to be dialed. If the phone or fax machine on one end goes off hook,

the phone or fax machine on the other end rings.

The phone and fax machine at the FXS site acts as though they are extensions of the

PBX at the FXO site.

FXS Loop Start to

E&M Dial

When the phone or fax machine at the FXS site

goes off hook, it connects to the PBX at the E&M site.

FXS Ground Start to

E&M Wink

When the phone or fax machine at the FXS site

goes off hook, it connects to the PBX at the E&M site. This phone circuit needs to be a

ground start circuit.

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2.2

Configuration 1

Configuration 1 is a data-only configuration. This configuration has two Multi-Tech MultiMux MMV1616C/56 which are

sixteen channel multiplexers with internal 56K bps composite link DSUs linking sites one and two over a Digital Data

Service (DDS) network provided by your telco facility. The local site has the MMV1616C/56 connected to a host

minicomputer. The remote site has fourteen terminals and two shared printers connected to the asynchronous

channels of the remote mux. At the remote site, the terminals are communicating with the remote mux on 19.2K bps

asynchronous channels, and the printers are configured for one setting above its cps rating. Configuration 1 is shown

in Figure 2-1.

Asynchronous

Channel

Asynchronous

Channel

Composite Link

PDN

Channel

MultiTech

Systems

Channel

MultiTech

Systems

Channel

Composite Link

Command Modem

Composite Link

MultiMux 16

Data/Voice/Fax

Composite Link

Command Modem

Composite Link

MultiMux 16

Statistical Multiplexer

Data/Voice/Fax

Voice/Fax Channel

Statistical Multiplexer

Digital Line

Voice/Fax Channel

MultiMux MMV1616

Minicomputer

Local Site

Printer

(Node 1)

Terminal

Printer

Terminal

Printer

Terminal

Remote Site

(Node 2)

Figure 2-1. Configuration 1

The local async channels can be configured to communicate with any of the async channels at the remote site. The

asynchronous channels of the local mux are configured with XON/XOFF software flow control enabled, so that the

channel buffers in the local mux do not lose data from the host. With flow control enabled at the local mux, the local

mux can tell the host when it feels that it's dynamic buffers are becoming full. For the same reasoning, pacing should

be enabled at the remote site printer channels to ensure that all data is received by the printers. Pacing allows the

printer to tell the remote mux not to send any more data until its buffers are cleared. Pacing may also be enabled at

the remote site terminal channels if it appears that data is being lost at the terminals. The first set of parameters in the

following examples are for the local mux and the second set are for the remote mux.

Local Channel Parameters/ Node # 01

STP

FLOW

CTRL

ENQ/

PASS PASS DEST DEST LINK

XON CHN NODE A/B

CHN SPD WD BIT PAR

ACK ECHO PACE EIA

01 19200

02 19200

03 19200

04 19200

05 19200

06 19200

07 19200

08 19200

09 19200

10 19200

11 19200

12 19200

13 19200

14 19200

15 19200

16 19200

NONE XON/XOFF OFF

OFF

OFF OFF

OFF

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Configuration 1 Local Site Channel Parameters

Local Channel Parameters/ Node #02

STP

FLOW

CTRL

ENQ/

PASS PASS DEST DEST LINK

XON CHN NODE A/B

CHN SPD WD BIT PAR

ACK ECHO PACE EIA

01 19200

02 19200

03 19200

04 19200

05 19200

06 19200

07 19200

08 4800

09 19200

10 19200

11 19200

12 19200

13 19200

14 19200

15 19200

16 4800

NONE XON/XOFF OFF

OFF

OFF OFF

ON OFF

OFF OFF

ON OFF

OFF

Configuration 1 Remote Site Channel Parameters

DSU

LOOP

TYPE

INTERNAL 56000

SPEED CLOCKING

DDS

BACK

OFF

Configuration 1 Composite Link Configuration

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2.3

Configuration 2

Configuration 2 is two MultiMux MMV1616C sixteen channel multiplexers with two external Multi-Tech 56K bps Digital

Service Units (DSUs) linking the two sites over a Digital Data Service (DDS) network. The RS232C interface on The

DSUs is connected to COMPOSITE LINK A EXTERNAL MODEM/DSU connector on the back panel of the MMV1616C.

The MMV1616Cs are set up for an external link device with a maximum link speed of 56,000 bps. Composite link A

needs to be set up for external clocking. Both external DSUs must be set for DDS clocking. Configuration 2 is shown in

Figure 2-2.

Composite Link

PDN

Asynchronous

Channel

Dial-Up Line

Channel

MT56DSU²

Channel

MultiTech

Systems

Channel

MultiTech

Systems

Channel

Composite Link

Command Modem

Composite Link

MultiMux 16

Data/Voice/Fax

Composite Link

Command Modem

Composite Link

MultiMux 16

Statistical Multiplexer

Data/Voice/Fax

Voice/Fax Channel

Statistical Multiplexer

Voice/Fax Channel

MultiMux MMV1616

Unix Host

Local Site

(Node 1)

Printer

Terminal

Printer

Terminal

Printer

Terminal

Remote Site

(Node 2)

Figure 2-2. Configuration 2

The channels are set up with the same considerations as in Configuration 1. The composite link configuration may be

changed using the List Composite Link Configuration ($L) command which is shown in the following example.

DSU

TYPE

LOOP

BACK

SPEED CLOCKING

EXTERNAL 56000 EXTERNAL

OFF

Configuration 2 Composite Link Configuration

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2.4

Configuration 3

Configuration 3 (Figure 2-3) is the networking configuration with one MultiMux MMV1616C and two MMV1608

multiplexers with the multiplexer at remote site 1 (Node 2) utilizing dual composite links. This networking configuration

allows the local site (Node 1) with the host minicomputer to communicate with remote sites 1 and 2. Remote site 1

communicates with the local site and remote site 2 (Node 3) communicates through remote site 1 to the local site.

Node 2 has two composite links with link A communicating with the local site and composite link B

Asynchronous

Channel

Asynchronous

Channel

Composite Link A

Node 2

Node 1

PDN

Channel

MultiTech

Systems

Channel

MultiTech

Systems

Channel

Composite Link

MultiMux 16

Terminal

Data/Voice/Fax

Composite Link

Command Modem

Composite Link

MultiMux 16

Statistical Multiplexer

Data/Voice/Fax

Voice/Fax Channel

Statistical Multiplexer

Digital Line

Voice/Fax Channel

MultiMux MMV1608

MultiMux MMV1616

Terminal

Composite

Minicomputer

Link

Printer

Terminal

Local Site

PDN

Terminal

Printer

Terminal

Remote Site 1

Asynchronous

Channel

Node 3

Channel

MultiTech

Systems

Channel

Composite Link

Command Modem

Composite Link

MultiMux 16

Data/Voice/Fax

Terminal

Statistical Multiplexer

Voice/Fax Channel

MultiMux MMV1608

Terminal

Printer

Terminal

Printer

Terminal

Remote Site 2

Figure 2-3. Configuration 3

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communicating with Node 3. Node 1 is configured with channels one through eight assigned a destination node of 2

and channels nine through sixteen assigned a destination node of 3. Node 2 has channels one through eight set with a

destination node of 1 which is the local site. Node 3 has channels one through eight set for destination channels nine

through sixteen of node 1. Node 2 passes through all communications between nodes 1 and 3.

The first set of parameters in the following examples are for the local site (node 1), the second set for the remote site 1

(node 2) and the last set for remote site 2 (node 3).

Local Channel Parameters/ Node # 01

STP

FLOW

CTRL

ENQ/

PASS PASS DEST DEST LINK

XON CHN NODE A/B

CHN SPD WD BIT PAR

ACK ECHO PACE EIA

01 19200

02 19200

03 19200

04 19200

05 19200

06 19200

07 19200

08 19200

09 19200

10 19200

11 19200

12 19200

13 19200

14 19200

15 19200

16 19200

NONE XON/XOFF OFF

OFF

OFF OFF

OFF

Configuration 3 Local Site Channel Parameters

Local Channel Parameters/ Node 02

STP

FLOW

CTRL

ENQ/

PASS PASS DEST DEST LINK

XON CHN NODE A/B

CHN SPD WD BIT PAR

ACK ECHO PACE EIA

01 19200

02 19200

03 19200

04 19200

05 19200

06 19200

07 19200

08 4800

NONE XON/XOFF OFF

OFF

ON OFF

OFF

Configuration 3 Remote Site 1 Channel Parameters

Local Channel Parameters/ Node 03

STP

FLOW

CTRL

ENQ/

PASS PASS DEST DEST LINK

XON CHN NODE A/B

CHN SPD WD BIT PAR

ACK ECHO PACE EIA

01 19200

02 19200

03 19200

04 19200

05 19200

06 19200

07 19200

08 4800

NONE XON/XOFF OFF

OFF

ON OFF

OFF

Configuration 3 Remote Site 2 Channel Parameters

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2.5

Configuration 4

Configuration 4 is the data/voice/fax configuration with two MultiMux MMV1608C/56/V multiplexers with single composite

link connecting a minicomputer and the station side of a PBX at the local site to a group of remote terminals and printer

on the data part of the network and a telephone and fax machine on the remote voice/fax channels. This FXO to FXS

configuration allows the remote site to communicate over the composite link to the local site and be able to use the

local PBX facilities as if he/she were at the local site. The FXO to FXS configuration is shown in Figure 2-4. In this

configuration the data communications is set up per configuration 1.

This configuration has the MV2 Voice/Fax board installed in the MMV1608/56/V multiplexers for the voice over data

communications. The local site has the VOICE/FAX CHANNEL 1 and 2 FXO connectors on the back panel of the local

multiplexer connected to a station card in the PBX. At the remote site, the two VOICE/FAX CHANNEL 1 and 2 FXS

connectors on the back panel of the remote multiplexer are connected to a telephone and fax machine.

Terminal

Asynchronous

Terminal

Printer

Channel

Asynchronous

Channel

PDN

Channel

Modem

MultiTech

Systems

Channel

Composite Link

Command Modem

Composite Link

MultiMux 16

Data/Voice/Fax

Statistical Multiplexer

MultiTech

Systems

Voice/Fax Channel

Channel

Composite Link

Command Modem

Composite Link

MultiMux 16

Data/Voice/Fax

Statistical Multiplexer

Composite Link

Voice/Fax Channel

Multiplexer

Voice/Fax

Channel 2 FXO

Multiplexer

Minicomputer

Voice/Fax Channel 2 FXS

Voice/Fax

Channel 1

FXS

Voice/Fax

Channel 1 FXO

Trunk

PSTN

Trunk

Station

Telephone

Fax

PBX

Remote Site

Local Site

(Node 1)

(Node 2)

Figure 2-4. Configuration 4 (FXO to FXS)

The local site is configured for an FXO configuration on both voice/fax channels using the V1LIFXO and V2LIFXO

commands and setting the Remote Interface type for an FXS configuration using the V1RIFXS and V2RIFXS

commands. The parameters for the local voice/fax channels can be displayed using the VL (List the voice/fax channel

parameters) command. The voice/fax channel parameters for the local site are shown in the Configuration 4 Local Site

Voice/Fax Channel Parameters. The voice/fax channel parameters are described in Chapter 5 Commands of this

manual.

LOCAL VOICE/FAX PARAMETERS CHANNEL1 LOCAL VOICE/FAX PARAMTERS CHANNEL 2

PARAMETER

STATUS

PARAMETER

STATUS

DESTINATION CHANNEL:

DESTINATION NODE:

LINK A/B/D:

DESTINATION CHANNEL:

DESTINATION NODE:

LINK A/B/D:

DIGITIZING RATE:

16000

DIGITIZING RATE:

16000

OUTPUT LEVEL ATTEN.:

INPUT LEVEL GAIN:

SILENCE SUPPRESSION:

OUTPUT LEVEL ATTEN.:

INPUT LEVEL GAIN:

SILENCE SUPPRESSION:

LOCAL INTERFACE TYPE:

GROUND/LOOP START (FXS):

2 OR 4 WIRE (E&M):

DIALTONE/WINK (E&M):

WINK TIMER (E&M)

FXO

N/A

2 WIRE

N/A

LOCAL INTERFACE TYPE:

GROUND/LOOP START (FXS):

2 OR 4 WIRE (E&M):

DIALTONE/WINK (E&M):

WINK TIMER (E&M)

FXO

N/A

2 WIRE

N/A

REMOTE INTERFACE TYPE:

GROUND/LOOP START (FXS):

2 OR 4 WIRE (E&M):

FXS

LOOP

2 WIRE

N/A

REMOTE INTERFACE TYPE:

GROUND/LOOP START (FXS): LOOP

2 OR 4 WIRE (E&M):

DIALTONE/WINK (E&M):

FXS

2 WIRE

N/A

DIALTONE/WINK (E&M):

Configuration 4 Local Site Voice/Fax Channel Parameters

The remote site is configured for an FXS configuration on both voice/fax channels using the V1LIFXS and V2LIFXS

commands and setting the Remote Interface type for an FXO configuration using the V1RIFXO and V1RIFXO

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commands. Whether the second voice/fax channel is used depends on whether one or two instruments (telephone or

fax machine) are connected. The parameters for the remote site can be displayed using the VL (List the Voice/Fax

Channel Parameters) command. The voice/fax channel parameters for the remote site are shown in the Configuration

4 Remote Site Voice/Fax Channel Parameters. The voice/fax channel parameters are described in Chapter 5

Commands of this manual.

LOCAL VOICE/FAX PARAMETERS CHANNEL1 LOCAL VOICE/FAX PARAMTERS CHANNEL 2

PARAMETER

STATUS

PARAMETER

STATUS

DESTINATION CHANNEL:

DESTINATION NODE:

LINK A/B/D:

DESTINATION CHANNEL:

DESTINATION NODE:

LINK A/B/D:

DIGITIZING RATE:

16000

DIGITIZING RATE:

16000

OUTPUT LEVEL ATTEN.:

INPUT LEVEL GAIN:

SILENCE SUPPRESSION:

OUTPUT LEVEL ATTEN.:

INPUT LEVEL GAIN:

SILENCE SUPPRESSION:

LOCAL INTERFACE TYPE:

GROUND/LOOP START (FXS):

2 OR 4 WIRE (E&M):

DIALTONE/WINK (E&M):

WINK TIMER (E&M)

FXS

LOOP

2 WIRE

N/A

LOCAL INTERFACE TYPE:

GROUND/LOOP START (FXS): LOOP

2 OR 4 WIRE (E&M):

DIALTONE/WINK (E&M):

WINK TIMER (E&M)

FXS

2 WIRE

N/A

REMOTE INTERFACE TYPE:

GROUND/LOOP START (FXS):

2 OR 4 WIRE (E&M):

FXO

N/A

2 WIRE

N/A

REMOTE INTERFACE TYPE:

GROUND/LOOP START (FXS):

2 OR 4 WIRE (E&M):

FX0

N/A

2 WIRE

N/A

DIALTONE/WINK (E&M):

Configuration 4 Remote Site Voice/Fax Channel Parameters

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2.6

Configuration 5

Configuration 5 is the data/voice/fax configuration with two MultiMux MMV1608C/56/V multiplexers with single composite

link connecting a minicomputer and a PBX trunk at the local site to a group of remote terminals and printer on the data

part of the network and a second PBX trunk on the voice/fax channels. The E&M configuration is shown in Figure 2-5.

In this configuration the data communications is set up per configurations 1, 2, or 3.

This configuration has the MV2 Voice/Fax board installed in the MMV1608/56/V multiplexers for the voice over data

communications. The local site has VOICE/FAX CHANNEL 1 E&M connector on the back panel of the local multiplexer

connected to a PBX E&M trunk. The same connection is made at the remote site.

Terminal

Asynchronous

Terminal

Printer

Channel

Asynchronous

Channel

PDN

Channel

Modem

MultiTech

Systems

Channel

Composite Link

Command Modem

Composite Link

MultiMux 16

Data/Voice/Fax

Statistical Multiplexer

MultiTech

Systems

Voice/Fax Channel

Channel

Composite Link

Command Modem

Composite Link

MultiMux 16

Data/Voice/Fax

Statistical Multiplexer

Composite Link

Voice/Fax Channel

Multiplexer

Voice/Fax

Channel 1 E&M

Minicomputer

Voice/Fax

Channel 1 E&M

Trunk

PSTN

Trunk

PSTN

Trunk

Station

PBX

Telephone

PBX

Local Site

Remote Site

(Node 1)

(Node 2)

Figure 2-5. Configuration 5 (E&M I-V)

Both sites are configured for an E&M configuration on voice/fax channel 1 using the V1LIE&M1W4 command and

setting the Remote Interface type for the same thing using the V1RIE&M1W4 command. The E&M connections can be

to either voice/fax channel. The parameters for local voice/fax channels can be displayed using the VL (List the voice/

fax channel parameters) command. The voice/fax channel parameters for the local and remote configurations are

shown in Configuration 5 Voice/Fax Channel Parameters. The voice/fax channel parameters are described in Chapter

5 Commands of this manual.

LOCAL VOICE/FAX PARAMETERS CHANNEL1 LOCAL VOICE/FAX PARAMTERS CHANNEL 2

PARAMETER

STATUS

PARAMETER

STATUS

DESTINATION CHANNEL:

DESTINATION NODE:

LINK A/B/D:

DESTINATION CHANNEL:

DESTINATION NODE:

LINK A/B/D:

DIGITIZING RATE:

16000

DIGITIZING RATE:

16000

OUTPUT LEVEL ATTEN.:

INPUT LEVEL GAIN:

SILENCE SUPPRESSION:

OUTPUT LEVEL ATTEN.:

INPUT LEVEL GAIN:

SILENCE SUPPRESSION:

LOCAL INTERFACE TYPE:

GROUND/LOOP START (FXS):

2 OR 4 WIRE (E&M):

DIALTONE/WINK (E&M):

WINK TIMER (E&M)

E&M 1

N/A

4 WIRE

WINK

100

LOCAL INTERFACE TYPE:

GROUND/LOOP START (FXS):

2 OR 4 WIRE (E&M):

DIALTONE/WINK (E&M):

WINK TIMER (E&M)

E&M 1

N/A

4 WIRE

WINK

100

REMOTE INTERFACE TYPE:

GROUND/LOOP START (FXS):

2 OR 4 WIRE (E&M):

E&M 1

N/A

4 WIRE

WINK

REMOTE INTERFACE TYPE:

GROUND/LOOP START (FXS):

2 OR 4 WIRE (E&M):

E&M 1

N/A

4 WIRE

WINK

DIALTONE/WINK (E&M):

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Configuration 5 Local site Voice/Fax Channel Parameters

LOCAL VOICE/FAX PARAMETERS CHANNEL1 LOCAL VOICE/FAX PARAMTERS CHANNEL 2

PARAMETER

STATUS

PARAMETER

STATUS

DESTINATION CHANNEL:

DESTINATION NODE:

LINK A/B/D:

DESTINATION CHANNEL:

DESTINATION NODE:

LINK A/B/D:

DIGITIZING RATE:

16000

DIGITIZING RATE:

16000

OUTPUT LEVEL ATTEN.:

INPUT LEVEL GAIN:

SILENCE SUPPRESSION:

OUTPUT LEVEL ATTEN.:

INPUT LEVEL GAIN:

SILENCE SUPPRESSION:

LOCAL INTERFACE TYPE:

GROUND/LOOP START (FXS):

2 OR 4 WIRE (E&M):

DIALTONE/WINK (E&M):

WINK TIMER (E&M)

E&M 1

N/A

4 WIRE

WINK

100

LOCAL INTERFACE TYPE:

GROUND/LOOP START (FXS):

2 OR 4 WIRE (E&M):

DIALTONE/WINK (E&M):

WINK TIMER (E&M)

E&M 1

N/A

4 WIRE

WINK

100

REMOTE INTERFACE TYPE:

GROUND/LOOP START (FXS):

2 OR 4 WIRE (E&M):

E&M 1

N/A

4 WIRE

WINK

REMOTE INTERFACE TYPE:

GROUND/LOOP START (FXS):

2 OR 4 WIRE (E&M):

E&M 1

N/A

4 WIRE

WINK

DIALTONE/WINK (E&M):

Configuration 5 Remote Site Voice/Fax Channel Parameters

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2.7

Configuration 6

Configuration 6 is the data/voice/fax configuration with two MultiMux MMV1608C/56/V multiplexers with single composite

link connecting a minicomputer and a telephone and/or fax machine at the local site to a group of remote terminals and

printer on the data part of the network and a second set of telephone and/or fax machine on the voice/fax channels.

The FXS to FXS configuration is shown in Figure 2-6. In this configuration the data communications is set up per

configuration 1.

This configuration has the MV2 Voice/Fax board installed in the MMV1608/56/V multiplexers for the voice over data

communications. Both sites have the MV2 Voice/Fax boards connecting VOICE/FAX CHANNEL 1and/or 2 FXS

connector(s) on the back panel of the multiplexer to either a telephone and/or a fax machine or both.

Terminal

Asynchronous

Terminal

Printer

Channel

Asynchronous

Channel

PDN

Channel

Modem

MultiTech

Systems

Channel

Composite Link

Command Modem

Composite Link

MultiMux 16

Data/Voice/Fax

Statistical Multiplexer

MultiTech

Systems

Voice/Fax Channel

Channel

Composite Link

Command Modem

Composite Link

MultiMux 16

Data/Voice/Fax

Statistical Multiplexer

Composite Link

Voice/Fax Channel

Multiplexer

Voice/Fax

Channel 1

FXS

Multiplexer

Minicomputer

Voice/Fax

Channel 2 FXS

Voice/Fax Channel 2 FXS

Voice/Fax

Channel 1

FXS

Telephone

Fax

Local Site

Remote Site

(Node 1)

(Node 2)

Figure 2-6. Configuration 6 (FXS to FXS)

Both sites are configured for an FXS configuration on voice/fax channel 1and/or 2 using the V1LIFXS command and/or

V2LIFXS command and setting the Remote Interface type for the same thing using the V1RIFXS and/or V2RIFXS. The

parameters for local voice/fax channels can be displayed using the VL (List the voice/fax channel parameters)

command. The voice/fax channel parameters are shown in Configuration 6 Voice/Fax Channel Parameters. The

voice/fax channel parameters are described in Chapter 5 Commands of this manual.

LOCAL VOICE/FAX PARAMETERS CHANNEL1 LOCAL VOICE/FAX PARAMTERS CHANNEL 2

PARAMETER

STATUS

PARAMETER

STATUS

DESTINATION CHANNEL:

DESTINATION NODE:

LINK A/B/D:

DESTINATION CHANNEL:

DESTINATION NODE:

LINK A/B/D:

DIGITIZING RATE:

16000

DIGITIZING RATE:

16000

OUTPUT LEVEL ATTEN.:

INPUT LEVEL GAIN:

SILENCE SUPPRESSION:

OUTPUT LEVEL ATTEN.:

INPUT LEVEL GAIN:

SILENCE SUPPRESSION:

LOCAL INTERFACE TYPE:

GROUND/LOOP START (FXS):

2 OR 4 WIRE (E&M):

DIALTONE/WINK (E&M):

WINK TIMER (E&M)

FXS

LOOP

2 WIRE

N/A

LOCAL INTERFACE TYPE:

GROUND/LOOP START (FXS): LOOP

2 OR 4 WIRE (E&M):

DIALTONE/WINK (E&M):

WINK TIMER (E&M)

FXS

2 WIRE

N/A

REMOTE INTERFACE TYPE:

GROUND/LOOP START (FXS):

2 OR 4 WIRE (E&M):

FXS

LOOP

2 WIRE

N/A

REMOTE INTERFACE TYPE:

GROUND/LOOP START (FXS): LOOP

2 OR 4 WIRE (E&M):

DIALTONE/WINK (E&M):

FXS

2 WIRE

N/A

DIALTONE/WINK (E&M):

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Configuration 6 Local Site Voice/Fax Channel Parameters

LOCAL VOICE/FAX PARAMETERS CHANNEL1 LOCAL VOICE/FAX PARAMTERS CHANNEL 2

PARAMETER

STATUS

PARAMETER

STATUS

DESTINATION CHANNEL:

DESTINATION NODE:

LINK A/B/D:

DESTINATION CHANNEL:

DESTINATION NODE:

LINK A/B/D:

DIGITIZING RATE:

16000

DIGITIZING RATE:

16000

OUTPUT LEVEL ATTEN.:

INPUT LEVEL GAIN:

SILENCE SUPPRESSION:

OUTPUT LEVEL ATTEN.:

INPUT LEVEL GAIN:

SILENCE SUPPRESSION:

LOCAL INTERFACE TYPE:

GROUND/LOOP START (FXS):

2 OR 4 WIRE (E&M):

DIALTONE/WINK (E&M):

WINK TIMER (E&M)

FXS

LOOP

2 WIRE

N/A

LOCAL INTERFACE TYPE:

GROUND/LOOP START (FXS): LOOP

2 OR 4 WIRE (E&M):

DIALTONE/WINK (E&M):

WINK TIMER (E&M)

FXS

2 WIRE

N/A

REMOTE INTERFACE TYPE:

GROUND/LOOP START (FXS):

2 OR 4 WIRE (E&M):

FXS

LOOP

2 WIRE

N/A

REMOTE INTERFACE TYPE:

GROUND/LOOP START (FXS): LOOP

2 OR 4 WIRE (E&M):

DIALTONE/WINK (E&M):

FXS

2 WIRE

N/A

DIALTONE/WINK (E&M):

Configuration 6 Remote Site Voice/Fax Channel Parameters

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2.8

Configuration 7

Configuration 7 is the data/voice/fax configuration with two MultiMux MMV1608C/56/V multiplexers with single composite

link connecting a minicomputer and a PBX E&M trunk at the local site to a group of remote terminals and printer on the

data part of the network and a telephone and/or fax machine on the remote voice/fax channels. The E&M to FXS

configuration is shown in Figure 2-7. In this configuration the data communications is set up per configuration 1.

This configuration has the MV2 Voice/Fax board installed in the MMV1608/56/V multiplexers for the voice over data

communications. The local site has the MV2 Voice/Fax board connecting VOICE/FAX CHANNEL 1and/or 2 E&M

connector(s) on the back panel of the local multiplexer to a PBX E&M trunk. At the remote site the MV2 Voice/Fax

board is connecting VOICE/FAX CHANNEL 1 and/or 2 FXS connector(s) on the back panel of the remote multiplexer to

a telephone and/or a fax machine on the second channel.

Terminal

Asynchronous

Terminal

Printer

Channel

Asynchronous

Channel

PDN

Channel

Modem

MultiTech

Systems

Channel

Composite Link

Command Modem

Composite Link

MultiMux 16

Data/Voice/Fax

Statistical Multiplexer

MultiTech

Voice/Fax Channel

Systems

Channel

Composite Link

Command Modem

Composite Link

MultiMux 16

Data/Voice/Fax

Statistical Multiplexer

Composite Link

Voice/Fax Channel

Multiplexer

Minicomputer

Voice/Fax

Channel 2 E&M

Voice/Fax

Channel 1 E&M

Voice/Fax Channel 2 FXS

Voice/Fax

Channel 1

FXS

Trunk

PSTN

Trunk

Station

Telephone

Fax

PBX

Telephone

Remote Site

(Node 2)

Local Site

(Node 1)

Figure 2-7. Configuration 7 (E&M I-V to FXS)

The local site is configured for an E&M configuration on both voice/fax channels using the V1LIE&M2D4 command for

channel 1 and V2LIE&M2D4) command for channel 2 and setting the Remote Interface type for an FXS configuration

using the V1RIFXS and or V2RIFXS commands depending on whether one or both of the remote voice/fax channels

are used. The parameters for the local and remote voice/fax channels can be displayed using the VL (List the voice/

fax channel parameters) command. The voice/fax channel parameters are shown in Configuration 7 Voice/Fax

Channel Parameters. The voice/fax channel parameters are described in Chapter 5 Commands of this manual.

LOCAL VOICE/FAX PARAMETERS CHANNEL1 LOCAL VOICE/FAX PARAMTERS CHANNEL 2

PARAMETER

STATUS

PARAMETER

STATUS

DESTINATION CHANNEL:

DESTINATION NODE:

LINK A/B/D:

DESTINATION CHANNEL:

DESTINATION NODE:

LINK A/B/D:

DIGITIZING RATE:

16000

DIGITIZING RATE:

16000

OUTPUT LEVEL ATTEN.:

INPUT LEVEL GAIN:

SILENCE SUPPRESSION:

OUTPUT LEVEL ATTEN.:

INPUT LEVEL GAIN:

SILENCE SUPPRESSION:

LOCAL INTERFACE TYPE:

GROUND/LOOP START (FXS):

2 OR 4 WIRE (E&M):

DIALTONE/WINK (E&M):

WINK TIMER (E&M)

E&M 2

N/A

4 WIRE

DIAL

LOCAL INTERFACE TYPE:

GROUND/LOOP START (FXS):

2 OR 4 WIRE (E&M):

DIALTONE/WINK (E&M):

WINK TIMER (E&M)

E&M 2

N/A

4 WIRE

DIAL

N/A

REMOTE INTERFACE TYPE:

GROUND/LOOP START (FXS):

2 OR 4 WIRE (E&M):

FXS

LOOP

2 WIRE

N/A

REMOTE INTERFACE TYPE:

GROUND/LOOP START (FXS): LOOP

2 OR 4 WIRE (E&M):

DIALTONE/WINK (E&M):

FXS

2 WIRE

N/A

DIALTONE/WINK (E&M):

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Configuration 7 Local Site Voice/Fax Channel Parameters

LOCAL VOICE/FAX PARAMETERS CHANNEL1 LOCAL VOICE/FAX PARAMTERS CHANNEL 2

PARAMETER

STATUS

PARAMETER

STATUS

DESTINATION CHANNEL:

DESTINATION NODE:

LINK A/B/D:

DESTINATION CHANNEL:

DESTINATION NODE:

LINK A/B/D:

DIGITIZING RATE:

16000

DIGITIZING RATE:

16000

OUTPUT LEVEL ATTEN.:

INPUT LEVEL GAIN:

SILENCE SUPPRESSION:

OUTPUT LEVEL ATTEN.:

INPUT LEVEL GAIN:

SILENCE SUPPRESSION:

LOCAL INTERFACE TYPE:

GROUND/LOOP START (FXS):

2 OR 4 WIRE (E&M):

DIALTONE/WINK (E&M):

WINK TIMER (E&M)

FXS

LOOP

2 WIRE

N/A

LOCAL INTERFACE TYPE:

GROUND/LOOP START (FXS): LOOP

2 OR 4 WIRE (E&M):

DIALTONE/WINK (E&M):

WINK TIMER (E&M)

FXS

2 WIRE

N/A

REMOTE INTERFACE TYPE:

GROUND/LOOP START (FXS):

2 OR 4 WIRE (E&M):

E&M 2

N/A

4 WIRE

DIAL

REMOTE INTERFACE TYPE:

GROUND/LOOP START (FXS):

2 OR 4 WIRE (E&M):

E&M 2

N/A

4 WIRE

DIAL

DIALTONE/WINK (E&M):

Configuration 7 Remote Site Voice/Fax Channel Parameters

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2.9

Configuration 8

Configuration 8 is a LAN to LAN configuration with two MultiMux MMV1608C/56/V multiplexers with a single composite

link. The muxes are connecting two local area networks (LANs) through the Sync Data Channel, connecting a

communications server on one LAN to a minicomputer at a remote site and connecting voice/fax communications

between the two locations. The LAN to LAN configuration is shown in Figure 2-8.

This configuration has the two LANs bridged together using bridges connected through the Sync Data Channel, the

async channels of communications server on one LAN are connected to a minicomputer at the other LAN, and voice/

fax communications is provided between the LANs. The external bridges are connected to the COMPOSITE LINK B

RS232C/V.35 connector on the back panel of both MultiMuxes, the async channels of the communications server are

tied through the CHANNEL connectors to the minicomputer at the other end, and the VOICE/FAX CHANNEL 1and/or 2

E&M connector(s) on the back panel of both multiplexers are connected to a PBX E&M trunk. The muxes are

configured so that the COMPOSITE LINK B RS232 connector is the synchronous data port.

Ethernet

Concentrator

Ethernet

Concentrator

Composite Link

PDN

SDLC Sync

Channel

SDLC Sync

Channel

MultiTech

Channel

Systems

MultiTech

Systems

Channel

Composite Link

Command Modem

Composite Link

MultiMux 16

LAN PC

Composite Link

Command Modem

Composite Link

MultiMux 16

Data/Voice/Fax

Statistical Multiplexer

LAN PC

Statistical Multiplexer

oice/Fax Channel

Voice/Fax Channel

Bridge

Digital Line

Multiplexer

Voice/Fax Channel

Multiplexer

Async

Channels

Voice/Fax Channel

LAN PC

Communications

Server

Trunk

LAN PC

PSTN

Trunk

Station

LAN PC

Telephone

PBX

File Server

Telephone

Async

Channels

Printer

Print Server

Minicomputer

Figure 2-8. Configuration 8 (LAN to LAN)

The bridging of the two LANs is provided by the synchronous connection between the two LAN bridges. This allows

any LAN pc on one LAN to communicate with any LAN pc on the other LAN. The async channels of the

communications server on one LAN are connected to a minicomputer at the other LAN. In this configuration, the voice/

fax communications are set up per configuration 5.

To configure the Sync Data Channel, the $MUXBSYNC command sets Composite Link B for sync data. The

parameters for the default configuration of Port A and Port B can be displayed by entering $L command. The default

configuration for Port A and Port B is shown in the example below.

CONFIGURATION OF PORT A: COMPOSITE LINK

DSU TYPE

EXTERNAL

SPEED CLOCKING LOOPBACK

56K INTERNAL OFF

CONFIGURATION OF PORT B: SYNC DATA

PROTOCOL

ANY SDLC

SPEED CLOCKING LOOPBACK

56K INTERNAL OFF

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Chapter 3 -

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4.1

Introduction

This chapter explains how to unpack and install your MultiMux cabinet.

4.2

Unpacking

Unpack and check all the items in the MultiMux shipping list to ensure that you have received the correct options and

accessories.

MultiMux Components

A. MultiMux Cabinet

B. Owner's Manual

C. Power cord

D. RJ48 phone cable (for internal DSU)

E. RJ11 phone cable (for internal modem)

F. Composite Link cable ( for external link device)

G. E&M (I-V) Voice/Fax Channel cable (2)

Inspect the MultiMux cabinet for visible shipping damage. If damage is observed, do not power-on the unit; contact

Multi-Tech's Tech Support for advice (refer to Chapter 8). If no damage is observed, place the MultiMux cabinet in its

final location.

Save the packing material for possible future use (e.g., return or relocation).

4.3

InstallationProcedure

The installation procedure is organized to cable the MultiMux first, then, if a V.35 interface is used, procedures on how

move the V.24/V35 shunt from its default position to the V.35 position, and finally how to configure the MultiMux. The

cabling procedure is provided in Table 4-1. The V.35 interface procedure is provided in Table 4-2. How to configure

the MultiMux is provided in Table 4-3.

Table 4-1. Cabling Procedure

Step

Procedure

Composite Link

1 Internal DSU on Port A or B - Composite Link

If your MultiMux has internal DSU(s), connect the RJ48 cable shipped with your MultiMux to the COMPOSITE

LINK A or B INTERNAL DSU connector(s) on the back panel of the MultiMux and to your phone line.

Proceed to cabling either the sync data channel or the async channels.

Table 4-1. Cabling Procedure

Step

Procedure

CHANNEL 14

CHANNEL 10

CHANNEL 13

CHANNEL 16

CHANNEL 12

CHANNEL 15

CHANNEL 11

CHANNEL

OFF

CHANNEL

MultiMux16™

MultiTech®

CAUTION

Systems

COMPOSITE LINK A

(RS232C/V.35)

INTERNAL

2400 BPS

MODEM

COMPOSITE LINK B

(RS232C/V.35)

COMMAND PORT

TERMINAL/PC

INTERNAL

DSU

EXTERNAL MODEM/DSU

DIAL-UP

LINE

DSU

EXTERNAL MODEM/DSU

F-GND

E&M

FXO

FXS

E&M

FXO

FXS

VOICE/FAX CHANNEL

Figure 4-1. Back Panel

External Modem/DSU with RS232C Interface

If either composite link is being connected to an external modem or DSU with an RS232C interface, connect

the composite link cable shipped with your MultiMux to the COMPOSITE LINK A or B (RS232C/V.35)

EXTERNAL MODEM/DSU connector(s) on the back panel and to the RS232 connector on the

external link device(s). Proceed to cabling either the sync data channel or the async channels.

External Modem/DSU with V.35 Interface

If either composite link is being connected to an external modem or DSU with a V.35 interface, refer to Table

4-2 to change the position of the V.24/V.35 shunt. Proceed to cabling either the sync data channel or

the async channels.

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Sync Data Channel - Port B only

If Port B is being connected to a synchronous device, connect the back-to-back cable supplied with your

MultiMux to the COMPOSITE LINK B (RS232C/V.35) EXTERNAL MODEM/DSU connector on the

back panel of the MultiMux and the other end of the cable to the RS232C connector on the

synchronous device. Refer to the synchronous device documentaiton for this connection.

Async Channel

2 Route and connect your channel devices to the MultiMux back panel CHANNEL 1 - CHANNEL 16 for a

MultiMux MMV1616 or CHANNEL 1 - CHANNEL 32 for a MultiMux MMV3232 connectors using

RS232 cables.

Note

Any cables connected to the computer should be

shielded to reduce interference.

Table 4-1. Cabling Procedure

Step

Procedure

Follow channel device guidelines regarding RS232 cable lengths and make sure that the pin assignment in

Appendices B and C of this manual are followed.

Voice/Fax Channels

3 If the Voice/fax board is being connected to the trunk side of a PBX, connect the E&M (I-V) Voice/fax Channel

cable supplied with your MultiMux between the VOICE/FAX CHANNEL 1 or 2 E&M connector on the

back panel of the MultiMux and the PBX. Configuration 5 (E&M I-V) and configuration 7 (E&M I-V to

FXS) are examples of E&M connections and are described in Chapter 2 of this manual.

Connect the RJ45 connector of this cable to either VOICE/FAX CHANNEL 1 E&M connector on the back panel

of the MultiMux or to VOICE/FAX CHANNEL 2 E&M connector on the MultiMux. Pin assignments for

this cable are described in Appendix D.

Connect the spade lug end of this cable to the trunk side of the PBX. Refer to the PBX manual for this

connection.

Note

If the spade lugs are not needed on the PBX

end, they may be cut off the cable.

4 If the Voice/fax board is being connected to the station side of a PBX, connect an RJ11 phone cable between

the VOICE/FAX CHANNEL 1 or 2 FXO connector on the back panel of the MultiMux and to the

station side of the PBX. Configuration 4 (FXO to FXS) is a example of this connection and is

described in Chapter 2 of this manual. Refer to the PBX manual for the station side connection.

5 If the Voice/fax board is being connected to a station instrument (telephone, KTS-key telephone system, or fax

machine), connect one end of an RJ11 phone cable to either the VOICE/FAX CHANNEL 1 or 2 FXS

connector on the back panel of the MultiMux and the other end to the station instrument.

Configuration 6 (FXS to FXS) is an example of this connection and is described in Chapter 2 of this

manual.

6 Perform the configuration procedures in Table 4-3.

Table 4-2. V.35 Interface

Step

Procedure

1 If either composite link is being connected to an external modem or DSU with a V.35 interface, loosen the four

quarter-turn-fasteners on the front panel and remove the front panel.

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Figure 4-2. Composite Link Cabling

2 Loosen the two pc board chassis lock screws on the back panel. See Figure 4-2.

3 Pry up on the two pc board chassis lock screws to unlock the pc boards in the chassis. Temporarily retighten

these screws while in the up position.

4 Disconnect the pc board power cable from the power supply. See Figure 4-3.

5 Partially pull out all the pc boards in the chassis just past the inside edge of the data and address ribbon cable

connectors. It may require a slight forward tug on the voice/fax board (if installed) to free it from its

board edge connector while pulling the other boards forward.

6 Disconnect the control ribbon cable from the Aggregate board.

7 Disconnect the data and address ribbon cable connector from the Aggregate board.

8 If the Voice/Fax board is in the chassis, remove the ribbon cable between the Aggregate board and the Voice/

Fax board.

Table 4-2. V.35 Interface (Cont.)

Step

Procedure

Figure 4-3. PC Board Removal

9 Remove the Aggregate board from the chassis.

10 On the Aggregate board, move the V.24/V.35 shunt for the composite link being connected from the V.24

position to the V.35 position. See Figure 4-4.

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Figure 4-4. Shunts

11 Partially slide the Aggregate board into the chassis.

12 If the Voice/Fax board is in the chassis, connect the short ribbon cable between the Aggregate board and the

Voice/Fax board. This ribbon cable goes on the front left side of the Aggregate board and is the only

connector on the Voice/Fax board.

Table 4-2. V.35 Interface (Cont.)

Step

Procedure

13 Reconnect the control ribbon cable on the right side between the Aggregate board and the Channel board(s).

WARNING

Make sure the ribbon cables are not crimped

and are tight or the entire MultiMux will be

damaged when power is applied.

14 Reconnect the data and address ribbon cable on the left side between the Aggregate board and Channel

Board(s).

15 Slide all the boards fully into the chassis. The Voice/Fax board (if installed) will require an extra push to seat it

in its board edge connector.

16 Ensure that the boards are seated into the back panel.

17 Ensure that the pc board chassis locks will seat into the boards. Then loosen, pry down and retighten the

screws.

Warning

Ensure that the power cable connector pins align

with the connector on the power supply board and

that the power cable connector has the locking notch

facing upward. If the cable is misaligned in any way

severe damage may occur to the unit.

18 Connect the pc board power cable to the power supply being careful that the pins are aligned properly. See

Figure 4-3.

19 Replace the front panel securing it to the chassis with the four quarter-turn-fasteners.

20 Connect a V.35 interface adapter cable (Multi-Tech #90056210) to the COMPOSITE LINK A or B (RS232C/

V.35) EXTERNAL MODEM/DSU connector(s) on the back panel and to the V.35 connector on the

external link device(s).

Table 4-3. Configuration Procedure

Step

Procedure

1 Connect the AC power cord shipped with your MultiMux to the AC power

and to the AC outlet.

connector on the back panel

2 Place the power ON/OFF switch on the back panel of the MultiMux to the ON position to apply power.

Supervisory Console

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3 If you are connecting a supervisory console to the MultiMux, connect a terminal or PC to the COMMAND

PORT connector via an appropriate RS232C cable. The PC must be running communications

software.

Note

Any cables connected to the computer should be

shielded to reduce interference.

4 Apply power to the supervisory console and enter AT and then hit Return. If you get an OK message back,

you are communicating with the Command Port. The Command Port operates at up to 19.2K bps.

Command Modem

5 To connect the built-in command modem to a standard phone line, connect the RJ11 cable to the 2400 BPS

MODEM DIAL-UP LINE connector on the back panel of the MultiMux and the phone jack.

Composite Link

6 Verify that the FC channel LEDs on the front panel flash on for a few seconds and then go out.

7 Verify that the CD, RCV, XMT, CTS LEDs on the composite link (A or B) that you have connected are on and

the RD LED goes off for that link. Proceed to configuring the Sync Data Channel or the Async

Channels.

Note

This verifies that the composite link

is up and working.

If the RD LED stays lit, the composite link device is not configured to communicate with the link, configure the

internal DSU. Proceed to configuring the composite link.

If the XMT and CTS LEDs lite for composite link A or B and the RD LED goes off, the remote mux is not

powered on or the remote DSU is not configured for the composite link. Proceed to configuring the

composite link.

Table 4-3. Configuration Procedure

Step

Procedure

8 Enter the List Composite Link Configuration command ($L) to display the default configuration of Composite

Link A and B. The display may appear as follows:

CONFIGURATION OF PORT A: COMPOSITE LINK

DSU TYPE

EXTERNAL

SPEED CLOCKING LOOPBACK

128KINTERNAL OFF

CONFIGURATION OF PORT B: COMPOSITE LINK

SPEED CLOCKING LOOPBACK

DSU TYPE

EXTERNAL

64KINTERNAL

OFF

9 Based on the listed conditions for the composite links, reconfigure the parameters to match your actual

composite link requirements by entering commands as described in Chapter 5.

As you change parameters, they will not actually be incorporated into your running system until you execute a

Store New Parameters (&W) command.

Sync Data Channel - Port B only

10 To configure port B as the Synchronous Data Channel, enter $MUXBSYNC command.

11 Enter a Store Parameter (&W) command and then reset the MultiMux by entering a reset (Z) command or

powering the MultiMux off and back on.

12 Enter $L command again to redisplay the configuration. The display appears as follows:

CONFIGURATION OF PORT A: COMPOSITE LINK

DSU TYPE

EXTERNAL

SPEED CLOCKING LOOPBACK

56KINTERNAL OFF

CONFIGURATION OF PORT B: SYNC DATA

PROTOCOL

ANY SDLC

SPEED CLOCKING LOOPBACK

56KINTERNAL OFF

13 Based on the listed conditions for the Sync Data Channel, reconfigure the parameters to match your actual

Sync Data Channel requirements by entering commands as described in Chapter 5.

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As you change parameters, they will not actually be incorporated into your running system until you execute a

Store New Parameters (&W) command.

Table 4-3. Configuration Procedure

Step

Async Channels

14 Execute the parameter display command to display the current channel

Procedure

parameter status for your local

MultiMux by entering the following:

ATL (hit Return)

The following will be displayed on your supervisory console for a MultiMux MMV1616:

Local Channel Parameters/ Node # 00

STP

FLOW

CTRL

ENQ/

PASS PASS DEST DEST LINK

XON CHN NODE A/B

CHN SPD WD BIT PAR

ACK ECHO PACE EIA

01 19200

02 19200

03 19200

04 19200

05 19200

06 19200

07 19200

08 19200

09 19200

10 19200

11 19200

12 19200

13 19200

14 19200

15 19200

16 19200

NONE

CTS

OFF

OFF OFF

OFF

15 Based on the listed conditions for each channel, reconfigure the parameters to match your actual channel

requirements by entering commands as described in Chapter 5.

As you change operational parameters, they will not actually be incorporated into your running system until

you execute a Store New Parameters (&W) command.

Table 4-3. Configuration Procedure

Step

Voice/Fax Channels

Procedure

16 To display the current Voice/Fax channel parameters, enter the following:

ATVL (hit Return)

The following will be displayed on your supervisory console for the Voice/Fax channels:

LOCAL VOICE/FAX PARAMETERS CHANNEL 1 LOCAL VOICE/FAX PARAMETERS CHANNEL 2

PARAMETER

STATUS

PARAMETER

STATUS

DESTINATION CHANNEL:

DESTINATION NODE:

LINK A/B/D:

DESTINATION CHANNEL:

DESTINATION NODE:

LINK A/B/D:

DIGITIZING RATE:

16000

DIGITIZING RATE:

16000

OUTPUT LEVEL ATTEN.:

INPUT LEVEL GAIN:

SILENCE SUPPRESSION:

OUTPUT LEVEL ATTEN.:

INPUT LEVEL GAIN:

SILENCE SUPPRESSION:

LOCAL INTERFACE TYPE:

GROUND/LOOP START (FXS):

2 OR 4 WIRE (E&M):

DIALTONE/WINK (E&M):

WINK TIMER (E&M):

FXS

LOOP

2 WIRE

N/A

LOCAL INTERFACE TYPE:

GROUND/LOOP START (FXS): LOOP

2 OR 4 WIRE (E&M):

DIALTONE/WINK (E&M):

WINK TIMER (E&M):

FXS

2 WIRE

N/A

REMOTE INTERFACE TYPE:

GROUND/LOOP START (FXS):

2 OR 4 WIRE (E&M):

FXS

LOOP

2 WIRE

N/A

REMOTE INTERFACE TYPE:

GROUND/LOOP START (FXS): LOOP

2 OR 4 WIRE (E&M):

DIALTONE/WINK (E&M):

FXS

2 WIRE

N/A

DIALTONE/WINK (E&M):

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17 Based on the listed conditions for the Voice/Fax channels, reconfigure the parameters to match your actual

Voice/Fax channel requirements by entering commands as described in Chapter 5.

As you change parmeters, they will not actually be incorporated into your running system until you execute a

Store New Parameters (&W) command.

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5.1

Introduction

This chapter presents a command summary followed by a detailed description of each command used in the MultiMux.

Each command line must begin with a prefix of AT and may contain any number of commands in a string (no spaces)

up to a limit of 40 characters. Most commands include a value and are part of the 40 character total. Hitting Return

executes a command line but does not incorporate it into the operation of your MultiMux. You must execute a Store

New Parameters command (&W) to implement your changes into your mux network.

An example of a command line which changes the parameters of the channel device connected to channel 1is shown

in the following example. The example changes the baud rate to 4800 bps, parity to odd, CTS flow control and turns

echo off

ATC1B4800P1F1E0

Table 5-1 presents a summary of all the commands used in the MultiMux. The commands are divided into a number of

general categories according to their functionality within the MultiMux. This functional division is carried on into the

detailed description of each command.

The access commands for the command modem are described in this chapter. The general AT commands for the

command modem are described in Appendix D.

The following functional grouping of the commands are listed with their paragraph title and paragraph number:

General Commands

5.2.1

5.2.2

5.2.3

5.2.4

5.2.5

5.2.6

5.2.7

Channel Parameter Commands

Composite Link Speed & Clocking commands

Additional Composite Link Commands

Voice/Fax Channel Commands

Test Commands

Command Modem Commands

Table 5-1. Command Summary

TYPE

COMMAND

DESCRIPTION

General

General Help

Channel Parameter Help

DIP-Switch Configuration Help

Composite Link Speed and Clocking Help

Additional Composite Link Help

Miscellaneous Help

Voice/Fax Channel Help

Additional Voice/Fax Channel Help

Reset

Store New Parameters to Memory

Channel

Parameter

Bxxx

C1-C32

Channel Off Command

Baud Rate Select

Universal Channel Parameters Command

Channel Select for Parameter Change

Destination Channel Selection

Destination Node Selection

Echo Off

Echo On

Flow Control Off

CTS (RS232C) Flow Control

Xon/Xoff Flow Control

Enq/Ack On

EnqAck Off

Pacing On

Pacing Off

Pass EIA (RS232C) Signals On

Pass EIA (RS232C) Signals Off

Xon Pass Thru On

F10

F11

F12

F13

Xon Pass Thru Off

Inverter DTR On

Inverter DTR Off

Xoff/First Character Pacing

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F14

I0-2

L,L0

L1-L32

Xoff/Xon Character Pacing

Identification Commands

List all Channel Parameters

List individual Channel Parameters

Link Used Per Channel

Parity None

Parity Odd

Parity Even

Response Time Priority

Stop Bit Selection

Local Source Node Number

Table 5-1. Command Summary (Cont.)

TYPE

COMMAND

SNGA..H

DESCRIPTION

Downline Load Source Number

Word Length

Load Factory Defaults

Select Local Parameters

Select Downline Parameters

Channel Statistics

Channel

Parameter

(Cont.)

&SL

&SR

Composite $DSUACL

Selects Clocking for Internal DSU on Link A

Link Speed

$DSUBCL

Selects Clocking for Internal DSU on Link B

and Clock

$DSUASP

$DSUBSP

$MUXACL

Selects Speed of Internal DSU on Link A

Selects Speed of Internal DSU on Link B

Selects Clocking when external DSU/

Modem for

Port A

$MUXBCL

$MUXASP

Selects Clocking from external sync device

Speed of the Clocking if Supplied by the

for Port B

Multiplexer

Port A

Port B

$MUXBSP

Speed of the Clocking if Supplied by the

Multiplexer

$MUXBSYNC

$MUXBCOMP

Selects Port B as Sync Data Channel

Selects Port B as Composite Link

Additional

Composite

Link

#FT

Clear Composite Statistics

Load Factory Defaults for DSU and ISCC

Flush Timer Value

List Configuration of Port A and Port B

List Composite Link Settings

Set Auto reporting Baud Rate

Set Auto Reporting Time Interval

Programmable Retransmit Timer

Composite Link Statistics

#RB

#RT

#RXT

#SL

Status of Front Panel LEDs

Voice/Fax

Channel

V(1/2)Z

List the Voice/Fax Channel Parameters

Reset Voice/Fax Channel

V(1/2)DC

V(1/2)DN

V(1/2)ML

Voice/Fax Destination Channel

Voice/Fax Destination Node

Link the Voice/Fax Channel will

Communicate Over

V(1/2)DR

V(1/2)OL

V(1/2)IL

Voice/Fax Channel Digitizing Rate

Voice/Fax Channel Output Level Attentuation

Voice/Fax Channel Input Level Gain

Voice/Fax Silence Suppression

V(1/2)SS

5-1. Command Summary (Cont.)

TYPE

COMMAND

V(1/2)LI

V(1/2)RI

DESCRIPTION

Additional

Voice/Fax

Channel

Voice/Fax Channel Local Interface Type

Voice/Fax Channel Remote Interface Type

Voice/Fax Channel Wink Timer

V(1/2)WT

Test

&T1-3

&T4

Memory Tests

Local Loop

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&T5

&T6

Digital Loop

Not Functional

&T7

Switch and LEDs

&T8

Memory Test

&T9

Watch Dog Timer Test

Internal Modem Memory Test

Quick Brown Fox Message Test

Voice/Fax Loopback Test

Sync Data Channel Loopback Test

&T10

&T11

&T12

&T13

Command

Modem

Repeat Last Command

Answer

Communications Standard (Bell/CCITT)

Dial

Echo Command Mode Characters (On/Off)

Load Factory Defaults

Guard Tone

Command Modem On/Off Hook

Inquiry for Product Code

Command Modem Select

On Line

#MA

Pulse Dial

&Pn

Make-to-Break Ratio

Result Code

Forcing an Answer Tone, in the Dialing

Read S-Register

Assign S-Register Value

Tone Dial

Sn?

SN=xxx

Result Codes (digit/word)

View Active Configuration and User Profiles

Wait for Dial Tone

&Wn

&Yn

Store Active Profile

Result Code Set/Call Progress

Select Stored Profile on Power Up

Recall Stored Profile

5-1. Command Summary (Cont.)

TYPE

COMMAND

DESCRIPTION

Command

Modem

(Cont.)

&Zn=x

0 to 9, A to D

Store Telephone Numbers

Dial Digits/Characters

Wait for Quiet Answer

Flash Hook

;

Automatic Pauses in Dialing

Return to Command Mode after Dial

Command Execution

+++

Escape Sequences (entering command

mode while

still on-line)

5.2

CommandDescription

The following command descriptions explain the effect that executing each command has on your MultiMux network.

Refer to Chapter 6 for instructions on how to execute the commands.

5.2.1

General Commands

Reset

The

MultiMux

Reset

command

its most

will

recently

set

the

stored

operating

values.

parameters

Executing

the

Reset

the

command performs the same function in the logic as turning

power off and then on

to the unit.

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Store New

Parameters

The

store

changes

Store

new

New

parameters.

MultiMux

Parameters

command

to executing

parameters are temporary

causes

the

MultiMux

and

command,

do not

Prior

the

affect the unit’s operation until you execute the &W command.

and will takes affect immediately.

The &W command

stores the parameters in nonvolatile memory

Help

The Help commands are designed to give you short explanations

on how to use MultiMux commands. They

manual is not handy, although the explanations are quite short

in comparison to those in the manual.

will

useful

Help

your

H1-H7

When

command

is executed in conjunction with some other command, the

resulting display will explain options and information for that

command.TheGeneral

Help command provides information

on the other MultiMux

Help commands.

The H command menu is as follows:

General Help

1. Each command line must begin with the prefix AT.

2. Each command line may contain any number of commands up

3. Most command letters must be followed by a value.

4. For help on specific commands, enter "ATH" followed by the

5. For additional help menus, enter "ATH" followed by numbers 1-7.

A.Type ATH or ATH0 for General Help.

to 40 characters total.

command letters.

B.Type ATH1 for channel parameter commands.

C.Type ATH2 to view the DIP switch configuration.

D.Type ATH3 for composite link speed and clocking commands.

E.Type ATH4 for additional composite link commands.

F.Type ATH5 for miscellaneous commands.

G.Type ATH6 for voice/fax channel commands.

H.Type ATH7 for additional voice/fax channel commands.

The H1 menu is as follows:

CHANNEL PARAMETER COMMANDS

BAUD RATE SELECTION

CHANNEL SELECTION

DEST. CHANNEL SELECTION

DEST. NODE SELECTION

LOCAL ECHO

PARITY SELECTION

RESPONSE TIME PRIORITY

STOP BIT SELECTION

LOCAL SOURCE NODE NUMBER

SNGA..H - DOWNLINE LOAD SOURCE NODE NUMBER

#S CHANNEL STATISTICS

FLOW CONTROL

READ IN FACTORY DEFAULTS &SL - SELECT LOCAL PARAMETERS

LIST PARAMETERS

LINK USED PER CHANNEL

&SR - SELECT DOWNLINE LOAD PARAMETERS

WL WORD LENGTH SELECTION

THE FOLLOWING EXAMPLE WILL SELECT CHANNEL 1 AND SET ITS BAUD RATE

THE WORD LENGTH TO 8 BITS:

TO 2400 AND

ATC1B2400WL8 <ENTER>

FOR HELP ON A SPECIFIC COMMAND, ENTER “ATH” FOLLOWED BY A COMMAND LETTER

The H2 menu is as follows:

MULTIMUX EIGHT POSITION DIP-SWITCH DEFINITIONS AND CONFIGURATIONS

SWITCH 1 SWITCH 2 SWITCH 3 SWITCH 4 SWITCH 5 SWITCH 6 SWITCH 7 SWITCH 8

INITIATE DSU

DSU

8/16

24/32

REMOTE

DWN

LINE

LOAD

TYPE

LINK A

TYPE CHANNEL CHANNEL ACCESS

LINK B

UP =

DN =

INTERNAL

16/32

8/24

24/32CHAN

8/16CHAN

ENABLED

DISABLED

OFF

EXTERNAL EXTERNAL

CURRENT SETTINGS:

DN DN

The H3 menu is as follows:

COMPOSITE LINK CLOCKING AND SPEED COMMANDS

INTERNAL DSU

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$DSUACL - SELECTS CLOCKING FOR INTERNAL DSU LINK A.

$DSUBCL - SELECTS CLOCKING FOR INTERNAL DSU LINK B.

$DSUASP - SELECTS SPEED FOR INTERNAL DSU LINK A.

$DSUBSP - SELECTS SPEED FOR INTERNAL DSU LINK B.

EXTERNAL DSU/MODEM

$MUXACL - SELECTS CLOCKING WHEN USING EXTERNAL DSU/MODEM PORT A.

$MUXBCL - SELECTS CLOCKING FROM EXTERNAL SYNC DEVICE ON PORT B.

$MUXASP - SPEED OF THE CLOCK IF SUPPLIED BY THE MULTIPLEXER PORT A.

$MUXBSP - SPEED OF THE CLOCK IF SUPPLIED BY THE MULTIPLEXER PORT B.

$MUXB

SELECTS PORT B AS SYNC DATA CHANNEL OR COMPOSITE LINK.

FOR HELP ON A SPECIFIC COMMAND, ENTER "ATH" FOLLOWED BY THE COMMAND LETTER.

EXAMPLE: ATH$DSUACL "ENTER"

The H4 menu is as follows:

ADDITIONAL COMPOSITE LINK COMMANDS

#C - CLEAR COMPOSITE STATISTICS

- LOAD FACTORY DEFAULTS FOR DSU AND ISCC

#FT - FLUSH TIMER VALUE

- LIST CONFIGURATION OF PORT A & B

- LIST COMPOSITE LINK SETTINGS

#RB - SET AUTO REPORTING BAUD RATE

#RT - SET AUTO REPORTING TIME INTERVAL

#RXT - PROGRAMMABLE RETRANSMIT TIMER

#S - COMPOSITE LINK STATISTICS

#SL - STATUS OF FRONT PANEL LEDS

FOR HELP ON A SPECIFIC COMMAND, ENTER “ATH” FOLLOWED BY A COMMAND LETTER.

The H5 menu is as follows:

MISCELLANEOUS COMMANDS

ID CODE

#MA

#RA

MODEM ACCESS FOR COMMAND MODEM

REMOTE ACCESS FOR COMMAND MODEM

TEST MODES

SAVE PARAMETERS "WRITE TO MEMORY"

RESET MULTIMUX

FOR HELP ON A SPECIFIC COMMAND, ENTER “ATH” FOLLOWED BY A COMMAND LETTER.

The H6 menu is as follows:

VOICE/FAX CHANNEL COMMANDS

LIST THE VOICE/FAX CHANNEL PARAMETERS

RESET VOICE/FAX CHANNEL

VOICE/FAX CHANNEL DIGITIZING RATE

VOICE/FAX DESTINATION CHANNEL

V(1/2)Z

V(1/2)DR

V(1/2)DC

V(1/2)DN

V(1/2)ML

V(1/2)OL

V(1/2)IL

V(1/2)SS

VOICE/FAX DESTINATION NODE

LINK THE VOICE/FAX CHANNEL WILL COMMUNICATE OVER

VOICE/FAX CHANNEL OUTPUT LEVEL ATTENTUATION

VOICE/FAX CHANNEL INPUT LEVEL GAIN

VOICE/FAX CHANNEL SILENCE SUPPRESSION

COMMAND EXAMPLE 1: ATV1DN2 - SETS THE DESTINATION NODE OF CHANNEL 1 TO 2.

FOR HELP ON A SPECIFIC COMMAND, ENTER “ATH” FOLLOWED BY A COMMAND LETTER.

The H7 menu is as follows:

ADDITIONAL VOICE/FAX CHANNEL COMMANDS

V(1/2)LI

V(1/2)RI

V(1/2)WT

VOICE/FAX CHANNEL LOCAL INTERFACE

VOICE/FAX CHANNEL REMOTE INTERFACE

VOICE/FAX CHANNEL WINK TIMER

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COMMAND EXAMPLE : ATV2LIFXSL- SETS THE LOCAL INTERFACE OF CHANNEL 2 TO FXS

WITH LOOP START.

FOR HELP ON A SPECIFIC COMMAND, ENTER “ATH” FOLLOWED BY A COMMAND LETTER.

5.2.2

Channel Parameter Commands

Channel Off

Command

allows

The

command turns off a particular channel or all channels depending

the more efficient use

dynamically allocated buffers and allows the multiplexer to skip

channel

off

command

turns

the

selected

channel

on the command. This

of the

thescanningofunused

off.

This

channels.

Baud Rate

Select

The

Bxxxxx

command

selects

the

bps

rate

the

indicated

channel. The channel bps rate is from 300 bps to 19.2K bps

Bxxxx

Universal

Channel

Parameters

The Universal Channel Parameters command incorporates the

commands that follow it (all prior to a Carriage Return) into all

the channels. This allows you to change such conditions as

baud rate, word length,

commands can be

parity and flow control on all channels

by executing a single command.

Channel

Select

The Channel Select command selects an individual channel on

which subsequent commands can operate. The Channel Select

command must precede any of the other commands but

remains in effect until changed. This is so that a string of

C1-C32

entered without preceding each one with a

Cxx command.

Destination The DC command specifies the destination channel to which

Channelthe source channel is

communicating. A specific channel can

networks,

Number

only communicate with one other channel. On multinode

this command must be entered at both channel locations specifying DCxx each other as

destinations (channels can pass through six

parameter can be downline loaded.

nodes to get to its destination). On point-to-point networks, this

Destination

The DN command specifies destination node of the channels to Node Number

which

the

local source channels will connect. On multinode

networks, this command must be entered at both channel

DNxx locations specifying each other as destinations (channels can

pass through

six nodes to get to its destination). On point-to-

point networks, this parameter can be down line loaded. For

example, if some node in your network is assigned 01 as its

number (a node where

its SN command was SN01), you can

communicate with the 01 location channels by executing a DN01

command for the channels you want to communicate with node

1. Atthatpoint,yourlocalchannelswillcommunicate

with those

at node 01.

Echo

The E0-E1 commands turn on and off the echoplex feature of the

Command

MultiMux. When the echo condition is on, the data entered on the

channel

of this

keyboard

is so

that

returned

in interactive

the

channel

display.

an operator

monitor.Whentheecho

returned to the monitor. E1 turns on echoplex and E0 turns it off.

The

purpose

will not

E0-1

operations

experience undue delays in seeing entered data appear on the

condition is off, the keyboard data is not

Flow Control

Operations

Flow Control is the means by which data flow is controlled from

the

channel

the

devices

into

the

MultiMux.

Flow

Control

necessary

cannot

when

data handling

capacity

individual

channel

F0-F2

keep up with the volume of data sent to it. There are two types

offlowcontrolavailable

on the MultiMux. The software based

Xon/Xoff and hardware based Clear to Send (CTS). F0 turns flow

control

flow

them

off,

control.

from

The

the

selects

way

MultiMux

CTS

channel

is called

flow

control,

devices

and

control

the

selects

data

Xon/Xoff

flow to

command).

individual

Pacing

(see

Pacing

The combination of Flow Control for regulating data from

channel devices and pacing for regulating data to individual

channel devices is how

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data

transfers

data is lost.

are

regulated

that

MUX INITIATED

FLOW CONTROL

CHANNEL DEVICE

INITIATED PACING

DATA

Channel

Device

Channel

Device

Mux

Pacing stops the output

of data from the mux

Flow control stops the

input of data to the mux

ENQ/ACK

Flow Control

These

control

sometimes

two

system

commands

used

referred

control

Hewlett

because it’s based on the computer sending an inquiry (ENQ)

the

selection

special

systems.

flow

control

Packard

Enquire/Acknowledge

computer

F3-F4

and then expecting an

acknowledgment

(ACK).

turns

this

feature and F4 turns off the feature.

Pacing

Control

The

Pacing

Control

command

(F5-on,

F6-off)

the

means

used

to control data flow to channel devices. Pacing is necessary when

devices

character

control

operating

time to

that

process

data is

mux

the

not

channel

data, the

lost in

require

pacing

the

commands

transfer process.

than

one

initiate

The

F5-F6

MultiMux is shipped with pacing off and it will have to be turned

On if your channel

data

device

cannot

accommodate

the

volume.The

control.

Pass

that

Pass EIA

Signals

The

mands

control

EIA

enable

Signal

commands

disable

the MultiMux.

of multiplexer

Pass EIA Signals

(F7-on,

individual

F8-off)

channels

are

normal

the

receive

interactive

transparent

will

com-

EIA

through

existence

signals

the

individual

Since

should

F7-F8

operations,

users,

operate

line

the

and

pins

shows

command

connected directly

multiplexer. This

one mux to

second

EIA

allow

terminals

not

they

through

were

communications

by allowing

done

passed

selected

(signals)

how

mux.

command

through

the

remote

Signals

The

following

diagram

Pass

routes the selected signals:

MultiMux

(A)

MultiMux

(B)

8 OUT

IN 4

IN 20

IN 25

Composite Link

Facility

6 OUT

22 OUT

4 IN

(Effect of the

PASS EIA

Signal

OUT 8

20 IN

25 IN

OUT 6

UT 22

Command)

Pass

The

Pass

Xon/Xoff

commands,

(F9-enable,

F10-disable),

are

Xon/Xoff

active only if Xon/Xoff flow control is active. Also called the “Pass

Through”

passing

mode,

commands,

through Xon/Xoff

the MultiMux will

they

enable

flow

obey

control

disable

signals.

Xon/Xoff

the

MultiMux

In the

from

Enable

and pass

F9-F10

the

commands

message

OTHER PERIPHERAL WE RECOMMEND USING FLOW

them on to the channel device. When this command is enabled,

PREVENT DATA LOSS TO A PRINTER OR

CONTROL AND PACING, NOT PASS XON", is sent to the

"TO

channel device. In the

MultiMux

Disable

mode,

the

and

will

obey

Xon/Xoff

commands

not

send

them

Through to be disabled

situations such

the

channel device. The default condition is for Xon/Xoff Pass

normally should remain disabled.However,

and

device, disabling the passing of Xon/Xoff signals may improve

throughput by utilizing buffers in the mux.

Inverted

DTR

The

Inverted

DTR

Commands

(F11 and F1 2) work in conjunction

with Pacing Control and change the way the MultiMux reacts to

the DTR signal. With

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Xon/Xoff

F11-F12

be controlled by the presence of the DTR

Flow

Control

and

Pacing,

you

Pacing, data flow will

(pin 20) signal on the RS232 interface. F11 turns on Inverted

will

end up with Xon/Xoff Pacing, and with CTS Flow Control plus

DTR so that a high signal stops data flow and a low starts

data flow. F12 turns off Inverted DTR so

that it acts normal

(high on and low off). If Flow Control is off, Pacing cannot be

turned on. If

Pacing is off, inverted DTR cannot be turned on.

Xoff/First

Char.

F13

Character

special

pacing

Selecting F1

command

that

the

called

MultiMux

X/off

First

stop

pacing.

causes

data flow to the channel device upon receipt of

The next character from the channel device will start data (it does

Xoff Character.

not have to be an Xon

F13-F14

Character). F14 will turn off this feature.

Identification

Commands

The

information

Technical

Identification

commands

valuable

personnel

identify

when

about

the

communicating

your unit or I0-2its Theperflo0rmacnocme.mand

type

with

MultiMux.

This

Multi-Tech's

Support

identifies the product. The I1 command

indicates the Aggregate board firmware version. The I2

command indicates the Voice/Fax firmware version.

List Channel

Parameters

The List Channel Parameters command causes the MultiMux

to display the condition of the parameters for each channel on the

system’s

To display

supervisory

console

for

shown

an individual

the

channel,

following

say

example.

channel

L-L0

the parameters

L1-L32

three, you would enter ATL3 and hit your Return key. To display

the parameters for all of the channels, enter ATL0 and then hit

your Return key.

Local Channel Parameters/ Node # 01

STP

CHN SPD WD BIT PAR

FLOW

CTRL

ENQ/

ACK ECHO PACE

PASS PASS DEST DEST LINK

EIA XON CHN NODE A/B

01 19200

02 19200

03 19200

04 19200

05 19200

06 19200

07 19200

08 19200

09 19200

10 19200

11 19200

12 19200

13 19200

14 19200

15 19200

16 19200

1 NONE

CTS

OFF OFF

OFF

OFF OFF

Modem Link

channel

This parameter specifies which link modem/DSU (link A, link B

will use for data communications.Links

not all using the same link. The MLD command selects dynamic channel

busy link per channel. When one channel is dynamic, all must be

dynamic. Works only in point-to-point networks and both muxes must be set to MLD.

Used

or Dynamic) each

should

selection

MLA/B/D

which permits the MultiMux to pick the least

Parity

Select

The

tions.

and

Parity

Under

word

Select

normal

length is

commands

operations

set at

set

the

(default

parity

conditions)

Since

MultiMux

parity

opera-

off

eight

bits.

the

MultiMux

P0-2

intended to be transparent to channel device operation, this

combination will pass

parity

information

it at even.

Pth0ecommand turnchsapnanreityl off, P1 sets oddedvicpeasri.tTyhaend P2 sets

Response

Time

The

Response

Time

Priority

command

determines

how

long

the

mux will wait to send data from channel devices relative to each

Priority

other.

Response

Time

setting

the

shortest

commands

and

ensure

the

longest.

that channel

transmissions or print

The

Priority

operations which require heavy data transfers, such as program

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operations, do not use too much of the

buffer and reduce the throughput of the other channels to

unsatisfactory levels. In such cases, the interactive user who

needs immediate responses would experience

delays. The Response Time Priority numbers 0, 1, 2, 3 establish the relative

unreasonable

time each group of channels must wait for data. The

lower the number the shorter the wait. Since this is a channel

group command, it does not control priority per channel but per

group. For example,

C1R3 sets channel group 1 (channel 1

channels within a group doing both interactive and batch work,

operation may

through 8) for a Response Time Priority 3. So, if you have

the group must be set to an R0 setting or the batch

utilize too much of the group's buffer resources. An R3 number

is the most

efficient for throughput (allows more data to be

assembled before sending a block).

Stop Bits

The

asynchronous

Stop

Bit

commands

characters.

command

set

The

sets

the

default

one,

number

stop

command

bits

one

used

stop

sets

bit

1.5,

condition

SB1SB1

SB1.5

SB2

SB1

SB1.5

and an SB2 command sets two stop bits.

Source Node

The SN command specifies the node number of the local node.

Number This

number

determined by you and can be any decimal

number up to 255. It should be assigned when you are designing

your network and needs to be unique to any other node in your network. Remember

that the node number selected will be used

by other nodes (using a DNxxx command) when accessing the

node. For example, if you assign 124 as the SN of a local node

(SN124 command), accessing that node from

another node

requires 124 in other nodes Destination Node number command

(DN124).

Remote Source

each:

This command selects the Source Node Number for groups of Node Number

four channels

Group Select

Group

Channel

1-4

Default

SNGA..H

5-8

9-12

13-16

17-20

21-24

25-28

29-32

The command is used when in point-to-point and multipoint (not

downline loading parameters.This command

parameters command &SR has been selected. The format of this command is SNGynnn where y is the group

networking) and when

you

are

active

only

letter and nnn

is the source node number desired (any decimal digit up to 255).

When

the

Voice/fax option is installed, the source node number

range is 0 to 31.

Word Length

Select

The

chronous

and 8 bits which correspond to WL5 through WL8.

Word

Length

communications.

Select

commands

The selections

set

the

available

word

length

are

for

asyn-

6, 7,

WL5-8

Load

The

factory

default

command

resets

the

MultiMux

parameters

Factory

Parameters

their original factory settings. They are as follows:

Channel Speed:

Word Length:

Stop Bits:

19200 bps

8 bits

One

None

XON/XOFF

Off

Parity:

Flow Control:

Enq/Ack Control:

Echo:

Off

Pacing:

Off

Pass EIA:

Off

Pass Xon/Xoff:

Dest Node:

DSU Link:

Off

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Select Local

Parameters

The

parameters

of this

parameter

Select

Local

and enables

all

Parameters

command

update

commands

stores

lists

them.

will

the

local

After

parameters.

channel

execution

you

other

command,

set.

act

the

local

When

&SL

command

the

power is turned on, the local parameter mode is in effect.

Select

Downline Load

Parameters

The

remote

them.

Select

mux

Downline

channel

execution

downline

Load

parameters

this

parameter

Parameters

command

you

other

lists

commands

new set

the

update

and

enables

all

To send

After

the

command,

will

act

set.

&SR

parameters to the remote MultiMux unit, 1) the Downline Load

switch (8-position DIP

switch SW1) must be set properly , 2) then

parameters to the remote mux.

executing an ATZ or powering off and on your unit sends the

Channel

Status

The

percentage

Channel

Status

activity

command

levels

displays

the

Individual

well

channel

the

displayed in the following format:

#S1-S32

STATISTICS FOR CHANNEL NUMBER XX

RECEIVE FLOW CONTROL TIME : 00 HRS 00 MIN

00 SEC

BUFFER UTILIZATION

EIA STATUS:

: 00%

PIN #: 4/RTS

5/CTS

6/DSR

8/DCD 20/DTR

22/RI

25/OOS

INPUT

TYPE : INPUT OUTPUT OUTPUT OUTPUT INPUT OUTPUT

STATUS: LO HI HI HI LO LO

5.2.3

Composite Link Speed and Clocking Commands

DSU Clock

timing oscillator ($DSUACLI) or from the

The DSU Clock command allows the internal DSU to accept

timing from it's internal

DDS Network'sReceive Bipolar Signal. The $DSUACLI

timing. DDS

the internal DSU is connected to DDS network line. The

$DSUCL

command enables the internal DSU on link A to establish the

Clocking command $DSUCLD is used whenever

$DSUCLD command is the factory default and automatically

configuresthe

MultiMux clocking.

DSU Speed

The DSU Speed command sets the speed of the internal DSU.

The $DSUASP56000

command sets the internal DSU on link A

$DSUSP

to a link speed of 56K bps. The default DSU speed is 56K

bps.The

DSU

speed

commands

$ D S U A /

BSP2400

$DSU/BSP4800

$DSUA/BSP9600

$DSUA/BSP56000

$DSUA/BSP19200

Mux Clock

timing oscillator ($MUXCLI) or derive

The Mux Clock command enables the MultiMux to accept timing

$MUXCL timing from a synchronous full-duplex external device

($MUXCLE). The $MUXBCL command is used any time an

from either it's internal

external link device is connected to the link or a

synchronous

device is connected to Port B as a Sync Data Channel. The $MUXACLI

command configures link A for internal clocking. If

command

the Sync Data Channel is configured, the $MUXBCLI

sets the MultiMux up for internal clocking. If the clocking is being

provided by

the synchronous device, the $MUXBCLE command

would be used to set the clocking. The default condition for

the

MultiMux is internal clocking.

Mux Speed

The Mux Speed command selects the clocking speed when

clocking is provided by

the MultiMux. The only time the mux

clocking. The Mux Speed commands are used when the ports

$MUXSP speed needs to be set is when the MultiMux is providing the

are set as composite link:

$MUXA/BSP 2400

$MUXA/BSP 14400

$MUXA/BSP 38400 $MUXA/BSP 57600 $MUXA/BSP 64000

$MUXA/BSP115200 $MUXA/BSP 128000 $MUXA/BSP 256000

$MUXA/BSP 4800 $MUXA/BSP 7200

$MUXA/BSP 9600

$MUXA/BSP 76800

$MUXA/BSP 19200

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When the Sync Data Channel is used and the MultiMux is

providing the clocking,

a word of caution; the Mux Speed command

should not be set so high that the Sync Data Channel over runs

the composite link. Things to consider are that if a voice/fax board

is installed, voice takes

the highest priority (voice compression is

either 9.6K or 16K of the bandwidth), the Sync Data Channel is

the next highest priority and the speed should be set so that the

remaining bandwidth for all the async

channels does not override

channels.

the composite link and there is sufficient bandwidth for the async

When Port B is selected as a Sync Data Channel, the following

Mux Speed commands

are used:

$MUXBSP9600

$MUXBSP19200

$MUXBSP56000

$MUXBSP14400

$MUXBSP38400

$MUXBSP64000

Mux B

or as a composite link. The

channel mode. The $MUXBCOMP command sets Port B to

The Mux B command causes Composite Link B (Port B) to

operate as a Sync Data Channel

$MUXB

$MUXBSYNC command places Port B in a synchronous data

operate as a composite link. When port B is in a

sync data

channel mode, the mux clocking and speed commands should be considered.

The MultiMux must be reset for the command to take

affect. The default condition is port B set as Composite Link

5.2.4

Additional Composite Link Commands

The Additional Composite Link commands perform the function of a system monitor. In addition to displaying the

information available on the MultiMux’s LED display, they also provide additional network statistical information. The

purpose of the commands are to allow network monitoring via the supervisory port as an alternative to viewing the LED

indicators. The various status commands and their functions are detailed below:

Clear

The

Clear

Composite

Statistics

command

clears

the

composite

Composite

Statistics

statistics record without resetting the entire MultiMux unit. The

#CA command clears link A composite statistics and #CB clears

link B statistics.

Load DSU

Factory Defaults

The Load DSU Factory Defaults command returns the status of

the internal DSU to its original (default) status as shipped from

thefactory. Thedefault

conditions are as follows:

Speed: 56K

Clock: DDS

Flush Timer

This command is necessary when the mux is used with Alpha-

Value Microcomputer and

Wyse Terminals. The command allows for

the proper use of the function keys as indicated on the keys. The

#FT

#FT0 command clears the function and sets the flush time value

to 10 msec and #FT1

sets the flush time value to 20 msec. The

default is #FT0.

List

display

Link

The List Composite Link Configuration command causes the

internal composite link

channel parameters on the supervisory console. The following Configuration

Composite

or sync

MultiMux to

data

e x a m p l e s

its

show the configuration of compoiste links A and B or

compositelinkAandportBasasyncdatachannel.Composite

link A is only used as a link connection, where as, composite link B (port B) can be used

in a link configuration or as a synchronous

data channel. The 8-position DIP switch SW2 on the Aggregate

board configures link A for an external link device in the Closed

(Down) position or

internal DSU in the Open (Up) position. DIP

Switch SW3 configures port B in the same manner when this link

is used as a composite link. When port B is used as a sync data

channel, DIP Switch

SW3 has no affect. The first two examples

show the configuration of ports A and B when the MultiMux is

configured as composite links A and B. The next two examples

connection and port B as a synchronous data channel.

show the composite link A as a link

CONFIGURATION OF PORT A: COMPOSITE LINK

DSU TYPE SPEED CLOCKING LOOPBACK

EXTERNAL 128K

INTERNAL

OFF

CONFIGURATION OF PORT B: COMPOSITE LINK

DSU TYPE SPEED CLOCKING LOOPBACK

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EXTERNAL 64K

INTERNAL

OFF

CONFIGURATION OF PORT A: COMPOSITE LINK

DSU TYPE SPEED CLOCKING LOOPBACK

EXTERNAL 56K

INTERNAL

OFF

CONFIGURATION OF PORT B: SYNC DATA

PROTOCOL SPEED CLOCKING LOOPBACK

ANY SDLC 56K

INTERNAL

OFF

List Composite

indicates the conditions that affect the link's operation,

response #L time setting. The default conditions are: inititate downline load

timer value of 10ms and a response time set to R3.

This command lists the status of the link configuration parameters. Link Settings The display

such as the downline load, flush timer value and the

is off, a flush

LOCAL MULTIMUX COMPOSITE SETTINGS

INITIATE

DOWNLINE

LOAD

CHAN 1-8

RESPONSE

TIME

FLUSH

TIMER

10MS

OFF

Status

Report

This

command

sets

command

the

baud

on the

rate

the

supervisor

status

report

console

generated

display.

the

#S0

system

Baud Rate

The speed options are as follows:

#RBxxxxx

#RB300 : 300 bps

#RB1200 : 1200 bps

#RB2400 : 2400 bps

#RB4800 : 4800 bps

#RB9600 : 9600 bps

#RB19200 : 19200bps

Status

This command sets the time interval in hours at which the status

report generated by the #S0 command is displayed on the system supervisor

display. The intervals

Report Time

console

#RT0-99

are

hour

increments from 1 to 99 hours, with #RT0 being the off

condition.

Programmable

The Programmable Retransmit Timer #RXT command allows

Retransmit Timer

t h e

user to set a maximum time limit on when an acknowledgement

MultiMux before the data #RXT block is retransmitted. The timer can be set for link A (#RTXA4)

and link B. The range of the timer is between 4 and 12 seconds. The factory default value is 4 seconds.

needs to be received from the remote

Composite Link

StatusReport

This

command

generates

statistics

report of the composite link

for display on the system supervisor console. The composite link status report can be

displayed for link A (#SA) and link B.The

report is in the following format:

COMPOSITE STATISTICS

ELAPSED TIME

00 DAYS

00 HRS

00 MIN.

DATA BLOCKS TRANSMITTED

DATA BLOCKS RETRANSMITS

DATA BLOCKS RECEIVED

RECEIVE BLOCK ERRORS

VOICE/FAX BLOCKS TRANSMITTED

VOICE/FAX BLOCKS RECEIVED

LINK ALARMS

REMOTE DOWNS

LINK UTILIZATION

RECEIVE FLOW CONTROL TIME :

AUTOMATIC REPORTING

00 HRS 00 MIN

OFF 19200 BAUD

00 SEC.

LED Status

#SL

This command displays the MultiMux front panel LED Status in

the following format:

THIS IS THE CURRENT STATUS OF THE FRONT PANEL LEDS ON MULTIMUX

# = ON BLANK = OFF X=UNKNOWN

COMPOSITE LINK A

COMPOSITE LINK B

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M T

X C M R

M T

T S

X #

5.2.5

Voice/Fax Channel Commands

The Voice/Fax Channel commands control the traffic of the voice and fax communication over the composite link network. The

Voice/Fax Channel commands are described in detail below:

List The Voice/Fax List The Voice/Fax Channel Parameters command causes the

Channel

MultiMux to display the parameters for the Voice/Fax channels

Parameters

on the system's supervisory console as shown in the following

example. The Voice/

Fax channel parameters display general

VL parameters for both channels and the local and remote channel

interfaces. To display the parameters for the Voice/Fax channels,

you would enter ATVL

and hit your Return key.

LOCAL VOICE/FAX PARAMETERS CHANNEL1 LOCAL VOICE/FAX PARAMTERS CHANNEL 2

PARAMETER

STATUS

PARAMETER

STATUS

DESTINATION CHANNEL

DESTINATION NODE

LINK A/B/D

DESTINATION CHANNEL

DESTINATION NODE

LINK A/B/D

DIGITIZING RATE

16000

DIGITIZING RATE

16000

OUTPUT LEVEL ATTEN.

INPUT LEVEL GAIN

SILENCE SUPPRESSION

OUTPUT LEVEL ATTEN.

INPUT LEVEL GAIN

SILENCE SUPPRESSION

LOCAL INTERFACE TYPE

GROUND/LOOP START (FXS)

2 OR 4 WIRE (E&M)

DIALTONE/WINK (E&M)

WINK TIMER

FXS

LOOP

2 WIRE

N/A

LOCAL INTERFACE TYPE

GROUND/LOOP START (FXS) LOOP

2 OR 4 WIRE (E&M)

DIALTONE/WINK (E&M)

WINK TIMER

FXS

2 WIRE

N/A

REMOTE INTERFACE TYPE

GROUND/LOOP START (FXS)

2 OR 4 WIRE (E&M)

FXS

LOOP

2 WIRE

N/A

REMOTE INTERFACE TYPE

GROUND/LOOP START (FXS) LOOP

2 OR 4 WIRE (E&M)

DIALTONE/WINK (E&M)

FXS

2 WIRE

N/A

DIALTONE/WINK (E&M)

Reset

Voice/Fax

Channel

The Reset Voice/Fax Channel command sets the operating

parameters for the voice/fax channel to the most recently

stored values and resets that channel.

V(1/2)Z

Voice/Fax

Destination

Channel

The Voice/Fax Destination Channel command selects which

voice/fax channel (1 or 2) on the destination MultiMux will receive

the voice/fax information. Local voice channel 1 (V1) can select

destination channel 1 DC1 or destination channel 2 DC2 to

V(1/2)DC

receivetheinformation.

will be sent. The voice/

Similarily, V2 can select DC1 or DC2.

Voice/Fax

The voice/Fax Destination Node command (V(1/2)DN(0-31))

selects the destination MultiMux (0-31) for which voice/fax data

Destination Node

fax channels 1 or 2 can select destination

V(1/2)DN

nodes from 0 to 31. Voice/fax channel 1 can select a

destination

node of 25 using V1DN25 command.

Link the Voice/Fax The Link the voice/Fax Channel will Communicate Over command

Channel will (V(1/2)ML(A/B/D)) selects the composite link (A/B/D) in which

Communicate Over the voice/fax data will be sent. Local voice/fax channel 1 can

over composite link A by executing V1MLA V(1/2)ML command. TheV2MLDcommandenablesvoice/faxchannel

send voice/fax data

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to transfer data using the dynamic link selection which allows the

MultiMux to

select the least busy link.

Voice/Fax Channel The Voice/Fax Channel Digitizing Rate command selects from

Digitizing Rate

two digitized or compressed rates 9600 or 16000 bps. At the

16000 bps rate, the voice transmission will be clearer. The

V1DR9600 places voice/fax channel 1 at a digitized or compressed

V(1/2)DR

rate of 9.6K bps. Note,

with silence suppression enabled, less

than 9600 bps of the link is used. The default digitizing rate is

16000 bps.

Voice/Fax Channel The Voice/Fax Channel Input Level Gain command selects the

Input Level Gain gain of the input voice/fax signal. As the input level gain is

increased, the volume level

increases. The input level gain V(1/2)IL ranges from -6 to 18db in increments of 1db with 0 db producing

no gain.

COMMAND

V(1/2)IL0

V(1/2)IL3

-1db

V(1/2)IL8

V(1/2)IL11

V(1/2)IL12

V(1/2)IL15

LEVEL

-6db

COMMAND

V(1/2)IL1

LEVEL

-5db

V(1/2)IL4

V(1/2)IL2

V(1/2)IL5

1db

-4db

-3db

V(1/2)IL6

V(1/2)IL9

-2db

V(1/2)IL7

0db

2db

3db

7db

V(1/2)IL10

4db

8db

5db

6db

9db

V(1/2)IL13

V(1/2)IL14

V(1/2)IL17

V(1/2)IL16

10db

11db

16db

V(1/2)IL18

14db

12db

V(1/2)IL21

V(1/2)IL19

15db

13db

V(1/2)IL20

V(1/2)IL22

V(1/2)IL23 17db

V(1/2)IL24 18db

When the input level on the local mux is adjusted, the volume

remote mux will change accordingly. The input level gain needs to be set on the transmitting mux (talking).

will increase the volume that the person at the receiving mux hears. To

level heard on the

This

increase the input level gain at the receiving mux will

have no affect on what this person hears.

MUX

PDN

MUX

Talk

Hear

Increase

2db

2db Louder

Talk

Hear

Produces 2db

Louder Volume

Increase

2db

Note

For the best results, increase or decrease both the

local output level and remote input level settings

by a small amount to change the volume level

heard at the local voice/fax channel.

The default settings per configuration are as follows:

Local Remote

IL OL IL OL

Configuration

FXS to FXO

FXS to FXS

E&M to E&M

(4-Wire)

Voice/Fax Channel The Voice/Fax Channel Output Level Attentuation command

Output Level Atten. selects the output signal level properties of the voice/fax

transmission. As the

output level attentuation increases, the

incremented in decible levels of 0.75db. Command V(1/2)OL0 is

attentuation for the 2-wire and 10db for the 4-wire.

V(1/2)OL volume level decreases. The signal level properties are

no signal

level

COMMAND

LEVEL

COMMAND

LEVEL

2-Wire 4-Wire

2-Wire

-0.75db

4-Wire

V(1/2)OL0

8.5db

0db

10db

V(1/2)OL1

7.75db

9.25db

V(1/2)OL2

-3.0db 7.0db V(1/

V(1/2)OL6 -4.5db 5.5db V(1/2)OL7 -5.25db

1.5db

V(1/2)OL3-2.25db

6.25db

V(1/2)OL4

2)OL5

-3.75db

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4.75db

V(1/2)OL10 -7.5db

V(1/2)OL8 -6.0db

2.5dbV(1/2)OL11 -8.25db

4.0db V(1/2)OL9

1.75db

-6.75db 3.25db

V(1/2)OL12 -9.0db 1.0db

V(1/2)OL13 -9.75db

0.25db

V(1/2)OL14

10.5db

2)OL17

4.25db

-0.5db

-12.75db

V(1/2)OL15-11.25db -1.25db

-2.75db

V(1/2)OL16

V(1/2)OL18 -13.5db-3.5db V(1/2)OL19

-12.0db -2.0db V(1/

-14.25db-

COMMAND

LEVEL

COMMAND

LEVEL

2-Wire 4-Wire

2-Wire

4-Wire

V(1/2)OL20 -15.0db -5.0db

V(1/2)OL21 -15.75db -5.75db

V(1/2)OL25 -18.75db -8.75db

V(1/2)OL29 -21.75db -11.75db

V(1/2)OL22

16.5db

19.5db

22.5db

-6.5db

V(1/2)OL23-17.25db -7.25db

V(1/2)OL24 -18.0db -8.0db

V(1/2)OL26

V(1/2)OL30

-9.5db

V(1/2)OL27-20.25db -10.25db

V(1/2)OL28 -21.0db -11.0db

-12.5db

V(1/2)OL31-23.25db -13.25db

The output level gain needs to be set at the mux that is receiving

(hearing), this will

change the volume level that the person at

the receiving mux hears. To increase the output level gain at the

transmitting mux will have no affect on the loudness heard by the

person at the receiving

mux.

MUX

PDN

MUX

Sounds

2db

Talk

Increase

2db

Louder

Sounds

2db

Talk

Louder Increase

2db

Note

For the best results, increase or decrease both the

local output level and remote input level settings

by a small amount to change the volume level

heard at the local voice/fax channel.

The default settings per configuration are as follows:

Local Remote

IL OL IL OL

Configuration

FXS to FXO

FXS to FXS

E&M to E&M

(4-Wire)

Voice/Fax Channel The Voice/Fax Channel Silence Suppression command keeps

Silence Suppression moments of silence from using up bandwidth on the composite

link. Typically, a voice

conversation is 50 to 60% silence. Silence

V(1/2)SS

suppression is helpful when using a slow composite link

speed such as 19,200 bps. The higher the command level (e.g.,

V1SS2), the

greater the silence suppression. The range of the

zero,

command is from 0 to 2. When silence suppression is set to

all sound passes through the link, even silence. Silence

suppression

is active when there is no activity on the voice/fax

channel. Increasing the setting increases the volume

necessary

for sound to be sent over the link.

Voice/Fax Channel The Voice/Fax Channel Local Interface command configures

Local Interface the local voice/fax channel interface. The V1LIFXO command

1 on the local MultiMux for an FXO

the

MultiMux is configured for an E&M interface, the E&M type

sets voice/fax channel

connection. When the local MultiMux is configured for FXO,

V(1/2)LI

remote site has to be configured for an FXS interface. When the

has to be determined, whether dial or wink is going

and whether the connection is 2-wire or 4-wire. For example, to c o n f i g u r e

to be used,

local voice/fax channel 1 for E&M type 1 which is

wire

very common in the U.S., wink-start E&M signaling and a 2-

connection, the command would be V1LIE&M1W2. The Local

C h a n n e l

Interface command are as follows:

ATV(1/2)LIFXO

side of PBX.

ATV(1/2)LIFXSG

telephone/fax with a

FXO Interface

Connects to station

FXS w/Ground Connects a single

mux.

Start Line

ground start line to the

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ATV(1/2)LIFXSL

telephone/fax with a

FXS w/Loop

Connects a single

Start Line

loop start line to the mux.

ATV(1/2)LIE&M(1-5) E&M Interface

Connects to E&M trunk

(D/W)(2-4)

side of a PBX.

(1-5)

(D/W)

(2/4)

Selects E&M type 1-5.

Selects E&M dial or wink

Selects E&M 2 or 4-wire

Voice/Fax Channel The Voice/Fax Remote Channel Interface command informs the Remote Interface localvoice/fax

channel of how the remote channel may be configured. A word of caution here, this command does not V(1/2)RI

actually change the remote interface. You may have to contact

the remote site for verification of its actual interface.

The

V1RIFXS command says that the remote interface is set for an

FXS

connection. If erratic voice/fax operation is noticed, the remote interface may be incorrectly set at the local MultiMux. The

Remote Channel Interface commands are as follows:

ATV(1/2)RIFXO

ATV(1/2)RIFXSG

with Ground Start.

ATV(1/2)RIFXSL

with Loop Start.

FXO Interface

FXS w/Ground Single telephone/fax

Station side of PBX.

Start Line

FXS w/Loop

Single telephone/fax

ATV(1/2)RIE&M(1-5) E&M Interface

Connects to E&M trunk

(D/W)(2-4)

side of a PBX.

(1-5)

(D/W)

(2/4)

Selects E&M type 1-5.

Selects E&M dial or wink

Selects E&M 2 or 4-wire

Voice/Fax Channel The Wink Timer command is used in the E&M interface to delay

Wink Timer

the sending of address information from the remote MultiMux.

The wink timer range is from 100 to 350 milliseconds. The default

delay is 250 msec.

V(1/2)WT

5.2.6

Test Commands

Memory

Test

There

test

which

system

memory

parameters.

stored

passes,

MultiMux.

are

(&T1)

two

will

automatically

memory

alter

tests

the contents

restored

reset

available

the

basic

executed.

the

warning

Memory

MultiMux.

system

The

memory,

first

when

command

contents

power

turned

the

&T1-2

test

When

parameters

the

when

(&T2)

The

second

stores

that

alters

the

destroyed.

parameters

memory

that

this

will

test

default

executed,

the

will

Test

given

(&T2)

your

factory

loaded

into

When

indicated

executing

any

message

the

memory

the

tests,

supervisory

complete

console

cycle

and

test

errors are indicated by appropriate messages.

Test Mode 3

Test Mode 3 tests the memory located on the voice/fax board (if installed) that is common to the voice/

fax and system boards.

&T3

Test Mode 4

Test

Mode

the

MultiMux.

Local

Loop

This

test

which

mode

checks

will

the

cause

operation

data

local

&T4

entered on channel device keyboards to be echoed back to the device’s monitor. When initiating this

must be disabled.

test, downline loading

Test Mode 5

&T5

Test Mode 5 is the Remote Loop test which causes any data from the composite link to be

can have data entered

on its channel devices echoed back to the same originating channel device monitor. When initiating this test, the

source and destination nodes on the local MultiMux must have the same values and the downline load feature disabled.

echoed through the DSU and back to the link. This command is used so that the local MultiMux

Test Mode 6

Not Used.

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Test Mode 7

test

&T7

Test Mode 7 is the Switch and LED operational test. By running

mode, you can switch

DIP-switches and verify that they work by corresponding LEDs

your MultiMux in this

the

being lit.

eight

Test Mode 8

&T8

Test Mode is the Non-Volatile Memory

check the proper operation of the MultiMux’s storage of operational

parameters. This test will overwrite the stored parameters.

test.

Its

function

Test Mode 9

&T9

Test

MultiMux’s

Mode

the

Watch-Dog

circuitry. The

Timer

test.

This

the

test

circuitry

checks

the

Watch-Dog

function

return the mux to normal operating mode if, for some reason, its

operation becomes erratic.

Test Mode 10

Test Mode 11

Not used.

Test mode 11 is the local channel test which checks the operation

&T11 Quick Brown Fox Jumped Over..." to all channel devices. You

should receive the complete sentence each time an &T11 command is executed.

ofallchannels(cabling,

connection, etc) by outputting "The

Test Mode 12

Test mode 12 is the voice/fax loopback test (if the voice/fax

feature is installed).

When this test is initiated, voice/fax channel

&T12

1 will communicate with voice/fax channel 2 and vice/versa on

thesameMultiMuxunit.

You will need to configure the local and

remote interface types (FXS,FXO, E&M) that you wish to test on

each voice/fax channel.

Test Mode 13

Test Mode 13 is the local loop test that receives data from a

synchronous device

and loops that data back to the sync device.

&T13

The MultiMux has to have port B configured as a synchronous

data channel in order

for this test mode to function. To exit the test

mode, you need to reset the MultiMux by entering a ATZ command.

5.2.7

Command Modem Commands

The command modem select and remote access commands are described in this section. The command modem

accepts commands at speeds up to 2400 bps. Additional command modem AT commands are provided in Appendix D.

Command

Modem

Select

The Command Modem Select command #MA1 sends all

subsequent commands generated on your supervisory console

to the command modem. The various commands for the

command modem are AT command set compatible with those

described in Appendix F. The #MA1 command enables the

#MA

command modem.

The #MA0 command disables the command

modem input and hangs up the phone line.

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6.1

Introduction

The following procedures assume that your MultiMuxes (local and remote) have been installed properly (refer to

Chapter 4) and the appropriate channel devices have been connected to each channel.

6.2

MultiMuxOperatingProcedures

The MultiMux operating procedures cover entering parameters for both your local and remote MultiMux units.

Table 6-1. MultiMux Operating Procedures

Step

Procedure

1Turn power on to your MultiMux and supervisory console, type AT and then hit Return. If you get an OK message

back, you are communicating with the command port.

2Execute the parameter display command to display current channel parameter status for your local MultiMux by

entering the following:

ATL (hit Return)

The following will be displayed on your supervisory console:

Local Channel Parameters/ Node # 00

STP

FLOW

CTRL

ENQ/

ACK ECHO PACE

PASS PASS DEST DEST LINK

EIA XON CHN NODE A/B

CHN SPD WD BIT PAR

01 19200

02 19200

03 19200

04 19200

05 19200

06 19200

07 19200

08 19200

09 19200

10 19200

11 19200

12 19200

13 19200

14 19200

15 19200

16 19200

1 NONE XON/XOFF OFF OFF

OFF

OFF OFF

Table 6-1. MultiMux Operating Procedures (cont.)

Step

Procedure

3To reconfigure the channel parameters to match your actual channel requirements enter commands as described in

Chapter 5 of this manual.

4If you change operational parameters they are not incorporated into your running system until you execute a Store

New Parameters (&W) command:

AT&W (hit Return)

The parameters will be stored in non-volatile memory and become effective immediately. When power is turned off, the

parameters will be saved.

5If you wish to display the composite link status, execute the List Composite Link Configuration command by entering

the following:

AT$L (hit Return)

The following will be displayed on your system monitor if your MultiMux is configured with an internal composite link

DSU on links A and B:

Configuration of Port A: Composite Link

DSU TYPE SPEED CLLCKINGLOOPBACK

EXTERNAL 128K INTERNAL

OFF

Configuration of Port B: Composite Link

DSU TYPE SPEED CLOCKINGLOOPBACK

EXTERNAL 128K INTERNAL OFF

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The following will be displayed on your system monitor if your MultiMux is configured with Port B as a synchronous data

channel:

Configuration of Port A: Composite Link

DSU TYPE SPEED CLOCKINGLOOPBACK

EXTERNAL 56K

INTERNAL

OFF

Configuration of Port B: Sync Data

DSU TYPE SPEED CLOCKINGLOOPBACK

ANY SDLC 56K INTERNAL OFF

Based on the listed composite link configuration conditions, reconfigure the parameters to the conditions required in

your particular installation by entering the appropriate Internal Composite Link Configuration

Commands as described in Chapter 5 of this manual. If you wish to save new parameters, you must

execute a AT&W command.

6If you wish to display the remote parameter status screen for downline

Load Parameters command by entering the following:

AT&SR (hit Return)

loading, execute the Select Downline

Table 6-1. MultiMux Operating Procedures (cont.)

Step

Procedure

The following will be displayed on your supervisory console:

Down line Load Channel Parameters

STP

FLOW

CTRL

ENQ/

ACK ECHO PACE

PASS PASS DEST DEST LINK

EIA XON CHN NODE A/B

CHN SPD WD BIT PAR

01 19200

02 19200

03 19200

04 19200

05 19200

06 19200

07 19200

08 19200

09 19200

10 19200

11 19200

12 19200

13 19200

14 19200

15 19200

16 19200

1 NONE XON/XOFF OFF OFF

OFF

OFF OFF

This display is not a listing of the actual parameters, but shows what can be downline loaded.

7After the remote parameter status screen is displayed, hit Return to display the Remote Source Node Number Group

Select screen that permits you to update either 16 channel entries for an MMV1600 series or 32

channel entries for an MMV3200 series.

Source Node For Group A (Channels 1-4)=xxx

Source Node For Group B (Channels 5-8)=xxx

Source Node For Group C(Channels 9-12)=xxx

Source Node For Group D (Channels 13-16)=xxx

Source Node For Group E (Channels 17-20)=xxx

Source Node For Group F (Channels 21-24)=xxx

Source Node For Group G (Channels 25-28)=xxx

Source Node For Group H (Channels 29-32)=xxx

For example, if your MultiMux MMV3200 series is connected to another 32 channel MultiMux with a source node (SN)

of 199, set all channels to 199 by entering ATSNGA199<CR>, then ATSNGB199, etc.

Table 6-1. MultiMux Operating Procedures (cont.)

Step

Procedure

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8To reconfigure a channel based on your actual channel requirements, enter commands as described in Chapter 5 of

this manual. To save new parameters, you must again execute an AT&W command.

9If you are downline loading remote parameters, 8-position DIP switch SW1 must be in the UP (open) position; refer to

the 8-position DIP Switch in the Configuration Chapter (Chapter 3) of this manual. The other mux in

your network must be configured properly and have its 8-position DIP switch SW1 in the DOWN

(closed) position. You then can execute a Reset command (Z) to send the new parameters to your

remote mux.

10To return to local parameter display and control, execute a Select Local

following:

Parameter command by entering the

AT&SL (hit Return)

11To use the status display and auto reporting feature, execute the Status Reporting command by entering the

following:

AT#A/BS0 (hit Return)

The following will be displayed on your system monitor:

COMPOSITE STATISTICS

ELAPSED TIME

00 DAYS

00 HRS

00 MIN.

DATA BLOCKS TRANSMITTED

DATA BLOCKS RETRANSMITS

DATA BLOCKS RECEIVED

RECEIVE BLOCK ERRORS

VOICE/FAX BLOCKS TRANSMITTED :

VOICE/FAX BLOCKS RECEIVED

LINK ALARMS

REMOTE DOWNS

LINK UTILIZATION

RECEIVE FLOW CONTROL TIME

AUTOMATIC REPORTING

00 HRS

19200

00 MIN

BAUD

00 SEC.

OFF

To select the bps rate and time interval at which the above status screen will appear, execute a #RBxx and #RTxx

commands as described in Chapter 5 of this manual.

6.3

Voice/Fax Operating Procedures

The Voice/Fax Operating Procedures begin with displaying the Voice/Fax Channel parameters and then executing the

commands to change the default parameters to fit your specific voice or fax needs. The Voice/Fax Channel parameters

are displayed for both channels and contain general parameters for each channel such as destination channel number

through silence suppression. The local and remote interface types define the specific type of interface and the

conditions that govern that interface. Not all the parameters for a particular interface apply, such as 2 or 4-wire, and

dialtone or wink do not apply for an FXO interface. To change a default Voice/Fax Channel parameter, refer to the

Voice/Fax Channel Commands in Chapter 5.

Table 6-2. Voice/Fax Operating Procedures

Step

Procedure

1If you wish to display the Voice/Fax Channel Parameters, execute the List The Voice/Fax Channel Parameters

command by entering the following:

ATVL (hit Return)

The following will be displayed on your system monitor:

LOCAL VOICE/FAX PARAMETERS CHANNEL1 LOCAL VOICE/FAX PARAMTERS CHANNEL 2

PARAMETER

STATUS

PARAMETER

STATUS

DESTINATION CHANNEL:

DESTINATION NODE:

LINK A/B/D:

DESTINATION CHANNEL:

DESTINATION NODE:

LINK A/B/D:

DIGITIZING RATE:

16000

DIGITIZING RATE:

16000

OUTPUT LEVEL ATTEN.:

INPUT LEVEL GAIN:

SILENCE SUPPRESSION:

OUTPUT LEVEL ATTEN.:

INPUT LEVEL GAIN:

SILENCE SUPPRESSION:

LOCAL INTERFACE TYPE:

GROUND/LOOP START (FXS):

2 OR 4 WIRE (E&M):

FXS

LOOP

2 WIRE

LOCAL INTERFACE TYPE:

GROUND/LOOP START (FXS): LOOP

2 OR 4 WIRE (E&M): 2 WIRE

FXS

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DIALTONE/WINK (E&M):

WINK TIMER

N/A

DIALTONE/WINK (E&M):

WINK TIMER

N/A

REMOTE INTERFACE TYPE:

GROUND/LOOP START (FXS):

2 OR 4 WIRE (E&M):

FXS

LOOP

2 WIRE

N/A

REMOTE INTERFACE TYPE:

GROUND/LOOP START (FXS): LOOP

2 OR 4 WIRE (E&M):

DIALTONE/WINK (E&M):

FXS

2 WIRE

N/A

DIALTONE/WINK (E&M):

Table 6-2. Voice/Fax Operating Procedures (Cont.)

Step

Procedure

2To reconfigure the Voice/Fax channel parameters to match your actual requirements enter commands as described in

Chapter 5 of this manual.

Note

A word of caution here, if you change your remote interface

parameters and your operation seems to become erratic,

recheck your remote parameters and verify them with

your remote site.

3If you change parameters they are not incorporated into your running system until you execute a Store New

Parameters (&W) command:

AT&W (hit Return)

The parameters will be stored in non-volatile memory and become effective immediately. When power is turned off, the

parameters will be saved.

6.4

Command Modem Operating Procedures

A wide variety of autodial operations and modem options can be controlled when the command modem is in the

command mode. Command modem access commands are described in Chapter 5. Appendix D describes the general

AT commands in detail.

Table 6-3. Command Modem Operating Procedures

Step

Procedure

1Set your supervisory console to 2400 bps or less to communicate with the command modem. Execute the Command

Modem Select command by entering the following:

AT#MA1 (hit Return)

The following will be displayed on your supervisory console when connected and in command mode:

COMMAND MODEM ACCESS ON

You may now enter the commands for the command modem as

described in Appendix F.

2You can have the "Result Codes" displayed in a “verbose” format (complete English words), or in a “terse” format

(single digit numbers). The factory default format is verbose. To change to terse format, enter the

Result Code Digit command as follows:

ATV0 (hit Return)

You can also choose to completely eliminate the display of all Result Codes by executing a Quiet (Q) command.

Before dialing your remote MultiMux, make sure that it is ready to accept calls through its command modem by having

its 8-position DIP switch SW4 set to the OPEN (UP) position.

3Dial the phone number of your remote MultiMux. To dial a phone number, use the Dial (D) command. You can use

Tone (T) dialing or Pulse (P) dialing and insert Automatic Pauses in Dialing (,) for functions such as

dialing through a PBX switchboard. Refer to Appendix D for detailed descriptions of dialing

commands.

For example, enter the following to dial a phone number (555-1212) through a switchboard.

ATD9,5551212 (hit Return)

When a carrier signal is detected, the Connect (1) Result Code is displayed.

If no carrier is detected, the No Carrier (3) Result Code is displayed after

about 30 seconds.

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Table 6-2. Command Modem Operating Procedures (Cont.)

Step

Procedure

4You are now communicating with your remote MultiMux. Any commands you now execute will be done by the remote

unit. For instance, to request status of the remote system execute the List Channel Parameters

Command by entering the following:

ATL (hit Return)

The following, which will be an actual listing of the remote unit’s channel

supervisory console:

parameters, will appear on your

Local Channel Parameters/ Node # 01

STP

FLOW

CTRL

ENQ/

ACK ECHO PACE

PASS PASS DEST DEST LINK

EIA XON CHN NODE A/B

CHN SPD WD BIT PAR

01 19200

02 19200

03 19200

04 19200

05 19200

06 19200

07 19200

08 19200

1 NONE XON/XOFF OFF OFF

OFF

OFF OFF

To end your call to the remote site you can either terminate the whole

command modem operation and put

your supervisory console back into communications with your local MultiMux, or you can end the

current call and remain connected to your command modem for additional remote communications.

To end the current call and place supervisory console control back to the local MultiMux, enter the following command:

AT#MA0 (hit Return)

To end the call and remain connected to your command modem, enter the following command:

+++ (hit Return)

Wait for the OK (0) Result code to be displayed on your supervisory console, then enter the following:

ATZ (hit Return)

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7.1

Introduction

The MultiMux is designed to make it easy to operate and maintain. The procedures in this chapter will help isolate any

problem you have to a specific component of your network, at which point you will be instructed to call the appropriate

personnel or execute commands to adjust operating conditions.

There are no specific repair procedures besides command execution and switch settings that you are expected to

perform in MultiMux maintenance.

An important part of the MultiMux design is its remote diagnostic capabilities. Our Tech Support department personnel

can dial-up your MultiMux through the command modem and execute special diagnostics that will help find problems

fast. When you’re stuck on a problem, do not hesitate to call us for help. Our staff may have encountered your problem

before and can help you quickly. Our phone numbers are listed in Chapter 8 of this manual.

7.2

ImportanceofCompositeStatistics

The Composite Statistics Command AT#SA/B provides additional information concerning the operation of your

composite link that can aid you in testing for problems. The composite report generated by this command can be very

valuable when used in conjunction with Analog Loopback testing. For example, if your REMOTE DWN indicator is on,

you could run an Analog Loopback test to make sure the failure is not in the MultiMux. If the test runs correctly, you

then can check the composite statistics for additional information.

The data in the composite statatistics report will tell you more about line failure conditions. The following items are on

your composite status report:

COMPOSITE STATISTICS

ELAPSED TIME

00 DAYS

00HRS

00 MIN.

DATA BLOCKS TRANSMITTED

DATA BLOCKS RETRANSMITS

DATA BLOCKS RECEIVED

RECEIVE BLOCK ERRORS

VOICE/FAX BLOCKS TRANSMITTED :

VOICE/FAX BLOCKS RECEIVED

LINK ALARMS

REMOTE DOWNS

LINK UTILIZATION

00 SEC.

RECEIVE FLOW CONTROL TIME

AUTOMATIC REPORTING

00 HRS

OFF 9600 BAUD

00 MIN

Comparing the number of blocks transmitted with the number of retransmits needed to get the data through can

indicate a line problem. Comparing the blocks received and receive block errors indicates the same problem from the

other end of the link. The comparative numbers that you might encounter could be 10,000 blocks transmitted (or

received) with 500 or 1000 retransmits (or receive block errors).

Link Alarms simply tell you that there are some sort of problems on the link. You will find that the Link Alarm numbers

will correspond to the Retransmit and Receive Block numbers. Specifically, a Link Alarm means that it has been 10

seconds since the MultiMux has received an acknowledgment. Normally, three acknowledgments will be received

during a 10 second period.

The Remote Down entry means that a MultiMux has sent data 30 times and could not get it through (the link has been

broken).

The other entries in the composite status report do not apply to link problems.

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7.3

TestCables

If you are using the MultiMux internal DSU, there are two test cables provided which can be used to help checkout your

system (refer to Figure 7-1). The MultiMux Test cable is a special back-to-back composite link test cable that can

connect your two MultiMuxes locally before installing them using a phone line. This cable will allow you to verify

operation of all aspects of the MultiMux prior to actual installation. The second test cable is the Composite Link

Loopback cable. Its function is to loopback the DSU signals to itself (loopback) so that you can check the function of the

MultiMux while installed without having to use the composite link phone line. If you are using an external synchronous

modem for the link communications, refer to its documentation for testing procedures.

If you have any problems in performing these procedures, contact Multi-Tech’s Technical Support department for

assistance, refer to Chapter 8.

Using the Test Cable

Test Cable

MultiMux

Internal Composite

Connector

Note: Used locally before installation to verify operation of

entire system except compolsite link.

Using the Composite Link Loopback Cable

Internal Composite

Connector

MultiMux

Composite Link

Loopback Cable

MultiMux

Note: Initiate Downline Load must be off for loopback testing.

Figure 7-1. Off Line Test Modes

7.4

TroubleshootingGuide

The following guides are set up as a series of possible conditions, causes and suggested fixes or steps in finding the

failing unit. Because of the different manufacturer’s equipment involved in typical multiplexer networks, you may

encounter “finger pointing” as to who is at fault. Who is at fault is not as important as getting you back on line as soon

as possible. The intent of the following guides are to indicate the most probable cause of specific error conditions, but,

since similar conditions may account for a number of different failures, the following guides are just that: a guide to

troubleshooting.

The parts of your mux network are:

Data Channel

• Channel devices (printers, terminals, pc’s, etc.)

• Channel Communications (RS232 cabling, asynchronous modems, etc.)

Voice/Fax Channel

• Telephones and fax machines

• Station side of PBX

• E&M trunk

Control units

Composite Link

• Digital composite link communications line with internal or external DSU

• External Synchronous link modems

• Composite link communications line (4-wire non-loaded metallic wire)

Once you have found the probable cause of your problem, refer to the specific manual chapter for additional help, or

contact Multi-Tech Technical Support (refer to Chapter 8).

Table 7-1. Data Troubleshooting Guide

Condition

Possible Cause

Corrective Action

Supervisory Console 1. Communications software 1. Install communications software on

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not communicating

Console.

not installed on Supervisory

software user’s manual forinstallation.

supervisory console, refer to comm

with mux command

port

2. Bad cable or cable

between supervisory

MultiMux for loose connection or

1. Check RS232 cable connections

console and COMMAND PORT on

bent pins, refer to Supervisory

connection

Console Installation procedures in

Chapter 4

2. Check RS232 cable connections

between supervisory console and

COMMAND PORT on MultiMux for

Diagrams in Appendix

correct cable wiring, refer to Cable

Supervisory Console 1. Incorrect command

1. Verify command modem baud rate is

not communicating

Software

modem baud rate

User’s Manual.

set to 2400 bps, refer to Comm with command mode

2. Call Tech Support for assistance,

refer to Chapter 8

Garbage on

1. Incorrect session

of 8, parity none, 1 stop bit), refer to

1. Verify session parameters (data bits

Supervisory

RD LEDs ON

parameters

comm

Console Screen

parameter settings.

software user’s manual for

2. Call Tech Support for assistance,

refer to Chapter 8

Composite Link down 1. Composite Link cabling

with CTS, XMT, and

1. If internal DSU is installed, check

Composite Link cabling for loose

connection.

2. If external DSU or modem is

installed, check RS232C/V.35 cable

connection or bent pin.

between devices for loose

2. Not receiving data from

ON.

1. Verify that both muxes are powered

2. Verify that both muxes are

remote mux

connected to communications line.

Table 7-1. Data Troubleshooting Guide(Continued)

Condition

Possible Cause

Corrective Action

Composite link down 2. Not receiving data from

remote mux (Continued) that they are powered ON and

RD LEDs ON

3. If external modem are used, verify

with CTS, XMT and

connected to the communication

line and Mux composite link.

(Continued)

4. Call Tech Support for assistance,

refer to Chapter 8.

3. Faulty communication line 1. Call phone company and verify

communication line.

refer to Chapter 8.

2. Call Tech Support for assistance,

Composite Link down 1. Both Muxes set up for

1. Remove front cover of both muxes

and verify if DIP-Switch 1 is in the

UP (ON) position.

with CD, CTS, XMT and

RCV LEDs ON and

RD LED ON

down line loading

2. Place DIP-Switch 1 on one of the

3. Call Tech Support for assistance,

1. Verify internal DSU speeds with $L

muxes in the DOWN (OFF) position.

refer to Chapter 8.

2. Internal DSU speeds

command, refer to Chapter 5.

muxes do not match.

on local and remote

Composite link down 1. External modem settings 1. Verify that external modem is set for

with CD, CTS and remote mux sync, full duplex and internal clocking.

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RD LEDs ON

2. Connect composite link cable

between mux and modem.

Composite link and all 1. Mux memory failure

channels down with

RD and all channel

1. Enter ATL and record all channel

parameters before running memory

test. Perform memory test by entering

&T2 command. All stored

RCV LEDs ON

parameters will be destroyed.

2. Reconfigure all channel parameters.

3. Call Tech Support for assistance,

refer to Chapter 8.

Flashing RXT LED

1. High error rate on

communication line

1. View composite link statistics using

#S command, refer to Chapter 5.

Table 7-1. Data Troubleshooting Guide(Continued)

Condition

Possible Cause

Corrective Action

Flashing RXT LED

communication line

1. High error rate on

test, refer to the Local and

2. Perform local and remote loopback

(Continued)

Communications Line Testing in this

Chapter.

3. Call phone company and verify

communication line.

4. Call Tech Support for assistance,

refer to Chapter 8.

All channel devices not 1. Incorrect channel

parameter settings

1. Verify channel parameter settings for

communicating with

all channels, refer to Chapter 5 for the

mux, composite link up

command.

with CO, CTS, XMT and

RCV LEDs ON and

RD OFF

2. Change channel parameters to match

channel devices. Refer to Chapter 5

for Channel Paramater Commands.

3. Perform channel device testing, refer

Chapter.

to Channel Device Testing in this

4. Call Tech Support for assistance,

refer to Chapter 8.

2.Channel devices

1. Refer to cabling diagrams of both mux

incorrectly

cabled

and channel devices.

2. Call Tech Support for assistance,

refer to Chapter 8.

Some channel devices 1. Incorrect channel

1. Verify channel parameter settings for

for those channel devices, refer to Lx

command in Chapter 5 to display

channel parameters.

not communicating

with MultiMux and

composite link up

parameter settings

for those channel devices

2. Perform channel device testing, refer

Chapter.

to Channel Device Testing in this

refer to Chapter 8.

3. Call Tech Support for assistance,

Table 7-1. Data Troubleshooting Guide(Continued)

Condition

Possible Cause

Corrective Action

Some channel devices 2. Incorrect cabling for those 1. Refer to cabling diagrams of both mux

not communicating

with MultiMux and

composite link up

refer to Chapter 8.

channel devices

and channel devices.

2. Call Tech Support for assistance,

Channel device losing 1. Flow control not properly

data set.

F2 and F5-F6 commands in

1. Verify flow control operations for the

selected channel device, refer to F0-

Chapter 5.

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Table 7-2. Voice/Fax Troubleshooting Guide

Condition

Possible Cause

Corrective Action

Volume levels not

on remote voice/fax

1. Input level gain setting too 1. Increase input level gain setting on sufficient on local

low

remote voice/fax channel a couple

voice/fax channel

channel.

db and

recheck voice quality, refer

to the V(1/2)IL command in

Chapter 5.

2. Output level attentuation

setting on local voice/fax channel a

2. Decrease output level attenuation

setting too

couple db and

high on local

recheck voice

voice/fax channel.

quality, refer to V(1/2)OL

command in Chapter 5.

Local telephone goes 1. Devices not connected to 1. Verify that the devices are attached off-hook and remote

correct voice/fax channel.

to the correct voice/fax channel Telephone does not

RJ-11 connector.

ring. FXS to FXS

Configuration

problem.

2. Voice/fax channel

is configured correctly (FXS,FXO,

node and composite link.

1. Verify that each voice/fax channel

configuration

or E&M), destination

channel and

2. Observe that the XSG LED on the

the telephone goes off-hook and

local voice/fax channel lights when

that the RSG LED on the remote

FXS configured voice/fax channel

flashes with each ring.

Data throughput slows 1. Too much bandwidth being 1. Decrease voice/fax channel

excessively when one

V(1/2)DR

used up for voice/fax.

command in Chapter 5.

channels are active.

digitizing rate to 9600 bps, refer to

or both voice/fax

2. Enable, or if active, increase silence

fax channels, refer to V(1/2)SS

suppression on one or both voice/

command in Chapter 5.

FXS to FXO

configuration - Local

1. Device not connected to

correct voice/fax channel.

RJ-11 connector.

1. Verify that the device is attached to

the correct voice/fax channel

telephone does not ring

2. Voice/fax channel

configuration problem.

1. Verify that the voice/fax channels

are configured correctly (destination

node and channel and composite

link).

2. Verify that local voice/fax interface

type is configured for FXS and

command in Chapter 5.

remote interface type is set for

FXO operation, refer to the VL

Table 7-2. Voice/Fax Troubleshooting Guide (Continued)

Condition

Possible Cause

Corrective Action

FXS to FXO

3. Change the local or remote

configuration - Local

V(1/2)LI or

configuration as needed using the

telephone does not ring

V(1/2)RI command,

(Continued)

refer to Chapter 5.

Parts of words not

being heard

db using the V(1/2)IL and

1. Part of analog signal

being clipped off.

1. Lower the input level gain and the

output level attentuation a couple of

V(1/2)OL commands. Refer to

these commands in Chapter 5.

Voice conversation or 1. Remote connection is

1. Verify the remote interface type at

the site that was just changed

using the VL command. Refer to

Chapter 5.

fax traffic become

different than remote

interface type.

erratic after changing

the remote interface type

2. Contact the remote site to verify its

local interface type and change

accordingly using the V(1/2)RI

command. Refer to Chapter 5.

No communication on 1. Composite link down.

1. Call phone company and verify

either voice/fax channel

communication line.

2. Phone cords for the voice 1. Verify that the phone cords for the

and/or fax machine are

voice and/or fax machine are

wrong channel or interface.

either

and/or

connected to the

connected to the correct channel

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interface connector type.

3. Voice/fax ribbon cable

between the voicefax and aggregate

1. Reconnect the voice/fax ribbon cable

not connected.

board. Refer to the

installation

procedures in Chapter 4.

2. Call Tech Support for assistance,

refer to Chapter 8.

4. MV2 Board failure

(test 12), refer to voice/fax channel

1. Perform the voice/fax loopback test

testing procedures in this chapter.

2. Call Tech Support for assistance,

refer to Chapter 8.

A voice/fax channel

cannot communicate

with the remote site

link. Use the VL command to view

refer to Chapter 5.

1. Voice/fax channel

configuration problem.

1. Verify that the voice/fax channel is

configured for the correct node and

channel destinaton and composite

the voice/fax channel parameters,

Table 7-2. Voice/Fax Troubleshooting Guide (Continued)

Condition

Possible Cause

Corrective Action

A voice/fax channel

cord.

the FXO and/or FXS

2. Wrong type of telephone

connected to the voice/fax channel is

(Continued)

1. Ensure that the telephone cord

cannot communicate

with the remote site

connector(s) or E&M cable for the

an RJ11 for

E&M 1-5 connection.

No voice/fax

communication

E&M to E&M

1. Frame ground not

connected to PBX

1. Attach PBX ground to MultiMux frame

ground screw.

2. Voice/fax configuration

1. Verify that voice/fax channel is

problem.

configured properly, (E&M, wink or

dial tone, 2 or 4 wire, E&M type).

3. Incorrect E&M cabling.

PBX. See Appendix D as well as

1. Verify connection of E&M cable to

PBX documentation.

2. Verify that XSG LED lights when PBX

LED lights when MultiMux asserts

asserts the M lead and that RSG

the E lead.

Voice sounds broken 1. Excessive errors on

1. Examine composite statistics for up or grabled at times

composite link.

errors.

2. Perform local and remote loop back

communication line.

tests to determine failing unit or bad

communication line.

3. Call phone company and

4. Call Tech Support for assistance,

refer to Chapter 8.

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7.5

ChannelDeviceTesting

The first step in system testing is to check the operation of the multiplexer network section from each channel device to

the MultiMux and back again to the channel device. These procedures will let you see if data from the channel device is

passing through the MultiMux properly, by echoing channel keystrokes through the MultiMux and then displaying them

as correct characters on the channel device’s monitor.

Table 7-3. Channel Device Testing Procedure

Step

Procedure

Place the local MultiMux unit in Test Mode 4 (i.e., executing the Local Loop test) by entering the following

command. If using your external link device, this test does not apply.

AT&T4 (hit Return)

Note: The MultiMux must have downline loading turned

off when doing channel device testing.

The supervisory console will display the following message:

LOCAL LOOP - TEST #4

Enter data on the keyboard of each channel device and, if the local portion of your network is operating correctly,

the data will be correctly displayed on each channel device monitor.

If the channel device is equipped with a local echo feature that is active,or if Echoplex is turned on for that

channel, double characters will be displayed indicating that the MultiMux is correctly echoing data.

When you have verified that the channel devices are operating correctly, enter the following to end the test:

ATZ(hit Return)

AT&TO (hit Return)

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7.6

DSUandCommunicationsLineTesting

After determining that the channel-device-to-MultiMux portion of the multiplexer network is operating properly, the next

steps are to check the operation of the local DSU, the communications line and the remote DSU. By performing the

procedures in Table 7-4, the MultiMux can send data (keystrokes) from the channel device and have them echoed

through the composite link, remote DSU and back to the channel device’s monitor.

Table 7-4. DSU and Communications Line Testing Procedure

Step

Procedure

Set the source and destination nodes on the local MultiMux to the same node number.

Place the remote MultiMux unit in Test Mode 5 (Digital Loopback test) by entering the following command.

AT&5 (hit Return)

The supervisory console will display the following message:

REMOTE DIGITAL LOOP - TEST #5

Enter data on the keyboard of each channel device on the local MultiMux and, if the network is operating

correctly, the data will be correctly displayed on the local channel device monitor. If the channel device is

equipped with an active local echo feature, double characters will be displayed.

When you have verified that the communications link is operating correctly, enter the following to end the test:

ATZ (hit Return)

AT&T0 (hit Return)

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7.7

MultiMuxFunctionalTestingProcedures

There are tests available on the MultiMux which check various functions within the MultiMux logic. These tests will

assist you in trouble shooting problems which are not related to the composite communications channel or local

channel devices. The two tests described below will check the non-volatile memory used for parameter storage and

internal circuitry, called the Watch-Dog circuitry, which is responsible for keeping the MultiMux functioning normally.

Table 7-5. MultiMux Functional Testing Procedures

Step

Procedure

Note: Executing the Battery/Memory test procedures

will result in the destruction of stored parameters.

Before checking the battery-backed memory feature, enter an ATL command and record all channel parameters.

Place the MultiMux in Test Mode 8 (i.e., executing the non-volatile RAM test) by entering the following command:

AT&T8 (hit Return)

(let the test complete its cycle)

The supervisory console will display the following message:

Memory test - This test will destroy all stored configurations.

Do you wish to continue? (Y/N)

Press the Y key (the message “writing” will appear while the test is running) and the following message will be

displayed on the supervisory console:

Turn power off for 10 seconds and then back on.

Then enter AT to end test.

As the message indicates, turn power off for ten seconds, then back on and enter AT and hit Return. Depending

on the condition of the battery, one of the following messages will appear on your supervisory console:

Non-Volatile Memory Test Passed

Non-Volatile Memory Test Failed

To check the Watch-Dog circuitry, place the local MultiMux unit in Test Mode 9 (i.e., executing the Watch-Dog

Timer Test) by entering the following command:

AT&T9 (hit Return)

The supervisory console will display the following message:

Watch-Dog Timer Test #9 - wait for test indicator to turn off

and when the test indicator comes back on,

enter “AT” to end test.

As the message indicates, after the test indicator comes back on enter the

following:

AT (hit Return)

If the test passes, the following message is displayed:

WATCH DOG TEST PASSED

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7.8

Voice/FaxChannelTesting

The voice/fax loopback test is confined to the MultiMux that the test is being run on. the loopback test communicates

between the two channels on the voice/fax board without going outside the MultiMux. An important factor to consider

before running this test is to ensure that the local and remote interfaces for both channels are set up correctly. This

test could isolate a voice/fax channel of a MultiMux as being defective.

Table 7-6. Voice/Fax Channel Testing Procedure

Step

Procedure

Before running the Voice/fax Loopback test, reconfigure the local interface type on voice/fax channel 1 to be the

same as the remote interface type on channel 2. Do the same thing for the local and remote interfaces on

channel 2. When this test is initiated, voice/fax channel 1 communicates with voice/fax channel 2 and vice/versa

on the same MultiMux unit.

Place the local MultiMux unit in Test Mode 12 (i.e., executing the voice/fax Loopback test) by entering the

following command.

AT&T12 (hit Return)

The supervisory console will display the following message:

VOICE/FAX LOOPBACK - TEST #12

Talk over one of the voice/fax channels and listen over the other channel. The voice quality should be the same

as if your were talking over the composite link. The voice/fax loopback test only ensure that both channels are

communicating.

When you have verified that the voice/fax channels are operating correctly, enter the following to end the test:

ATZ (hit Return)

AT&T0 (hit Return)

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7.9

SyncDataChannelTesting

The Sync Data Channel Loopback test is used when the MultiMux has configured Port B for the sync data mode. This

test simulates a modem or DSU in sync loopback mode. To use this test, configure the synchronous device for

loopback test in which port B loops the data back to the synchronous device.

Table 7-7. Sync Data Channel Testing Procedure

Step

Procedure

Before the Sync Data Channel Loopback test is run, port B of the MultiMux has to be set for the sync data mode

using the $MUXBSYNC command.

Place the local MultiMux unit in Test Mode 13 (i.e., executing the Sync Data Channel Loopback test) by entering

the following command.

AT&T13 (hit Return)

The supervisory console will display the following message:

AT THIS POINT IN TIME, ANY SYNC DATA

RX'D BY THE MUX IS LOOPED BACK OUT

AND TX'D BY THE MUX.

When you have verified that the Sync Data Channel is operating correctly, enter the following to end the test:

ATZ (hit Return)

AT&T0 (hit Return)

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Chapter 8 - Service, Warranty and Tech Support

Warranty

Multi-Tech Systems, Inc., (hereafter “MTS”) warrants that its products will be free from defects in material or workman-

ship for a period of two, five, or ten years (depending on model) from date of purchase, or if proof of purchase is not

provided, two, five, or ten years (depending on model) from date of shipment.

MTS MAKES NO OTHER WARRANTY, EXPRESS OR IMPLIED, AND ALL IMPLIED WARRANTIES OF MERCHANT-

ABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE HEREBY DISCLAIMED.

This warranty does not apply to any products which have been damaged by lightning storms, water, or power surges or

which have been neglected, altered, abused, used for a purpose other than the one for which they were manufactured,

repaired by Customer or any party without MTS’s written authorization, or used in any manner inconsistent with MTS’s

instructions.

MTS’s entire obligation under this warranty shall be limited (at MTS’s option) to repair or replacement of any products

which prove to be defective within the warranty period or, at MTS’s option, issuance of a refund of the purchase price.

Defective products must be returned by Customer to MTS’s factory – transportation prepaid.

MTS WILL NOT BE LIABLE FOR CONSEQUENTIAL DAMAGES, AND UNDER NO CIRCUMSTANCES WILL ITS

LIABILITY EXCEED THE PRICE FOR DEFECTIVE PRODUCTS.

Repair Procedures for U.S. and Canadian Customers

In the event that service is required, products may be shipped, freight prepaid, to our Mounds View, Minnesota factory:

Multi-Tech Systems, Inc.

2205 Woodale Drive

Mounds View, MN 55112

Attn: Repairs, Serial # ____________

A Returned Materials Authorization (RMA) is not required. Return shipping charges (surface) will be paid by MTS.

Please include, inside the shipping box, a description of the problem, a return shipping address (must have street

address, not P.O. Box), your telephone number, and if the product is out of warranty, a check or purchase order for

repair charges.

For out of warranty repair charges, go to www.multitech.com/documents/warranties

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Extended two-year overnight replacement service agreements are available for selected products. Please call MTS at

(888) 288-5470, extension 5308 or visit our web site at

http://www.multitech.com/programs/orc/ for details on rates and coverage’s.

Please direct your questions regarding technical matters, product configuration, verification that the product is defec-

tive, etc., to our Technical Support department at (800) 972-2439 or email [email protected]. Please direct your

questions regarding repair expediting, receiving, shipping, billing, etc., to our Repair Accounting department at (800)

328-9717 or (763) 717-5631, or email [email protected].

Repairs for damages caused by lightning storms, water, power surges, incorrect installation, physical abuse,

or user-caused damages are billed on a time-plus-materials basis.

Repair Procedures for International Customers (Outside U.S.A. and Canada)

Your original point of purchase Reseller may offer the quickest and most economical repair option for your Multi-Tech

product. You may also contact any Multi-Tech sales office for information about the nearest distributor or other repair

service for your Multi-Tech product.

http://www.multitech.com/COMPANY/offices/DEFAULT.ASP

In the event that factory service is required, products may be shipped, freight prepaid to our Mounds View, Minnesota

factory. Recommended international shipment methods are via Federal Express, UPS or DHL courier services, or by

airmail parcel post; shipments made by any other method will be refused. A Returned Materials Authorization (RMA) is

required for products shipped from outside the U.S.A. and Canada. Please contact us for return authorization and

shipping instructions on any International shipments to the U.S.A. Please include, inside the shipping box, a descrip-

tion of the problem, a return shipping address (must have street address, not P.O. Box), your telephone number, and if

the product is out of warranty, a check drawn on a U.S. bank or your company’s purchase order for repair charges.

Repaired units shall be shipped freight collect, unless other arrangements are made in advance.

Please direct your questions regarding technical matters, product configuration, verification that the product is defec-

tive, etc., to our Technical Support department nearest you or email [email protected]. When calling the U.S.,

please direct your questions regarding repair expediting, receiving, shipping, billing, etc., to our Repair Accounting

department at

+(763) 717-5631 in the U.S.A., or email [email protected].

Repairs for damages caused by lightning storms, water, power surges, incorrect installation, physical abuse, or user-

caused damages are billed on a time-plus-materials basis.

Repair Procedures for International Distributors

Procedures for International Distributors of Multi-Tech products are on the distributor web site.

http://www.multitech.com/PARTNERS/login/

10-Sep-01

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AppendixA

ASCII Character Code/Hex/Decimal Conversion Chart

CTRL CODE HEX DEC

CODE HEX DEC CODE HEX DEC CODE HEX DEC

NUL

SOH

STX

ETX

EOT

ENQ

ACK

BEL

118

“

‘

100

101

102

103

104

105

106

107

108

109

110

111

112

113

114

115

116

117

(

)

[

DLE

DC1

DC2

DC3

DC4

NAK

SYN

ETB

CAN

v76

119

120

121

122

123

124

125

126

127

SUB

ESC

;

{

]

}

]

–

—

DEL

NUL

SOH

STX

ETX

EOT

ACK

BEL

Null,orallzeros

StartofHeader

StartofText

EndofText

EndofTransmission

Acknowledge

BellorAlarm

Backspace

HorizontalTab

VerticalTab

EndTransmissionBlock

DC1

DC2

DC3

DC4

CAN

SUB

DeviceControl1

DeviceControl2

DeviceControl3

DeviceControl4

Cancel

EndofMedium

Substitute

FileSeparator

GroupSeparator

RecordSeparator

Delete

SYN

ENQ

ESC

DLE

NAK

Shift In

ShiftOut

Sync.

LineFeed

FormFeed

Enquiry

Escape

DataLinkEscape

NegativeAcknowledge

CarriageReturn

ETB

DEL

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Appendix B

RS232C Interface Specification

The MultiMux RS232C interface circuits have been designed to meet the electrical specifications given in the EIA

(Electronic Industries Association) RS232C and CCITT (Consultative Committee of International Telegraph and

Telephone) standards. All signals generated by the mux are approximately 10 volts when measured across a load of

300 ohms or greater. The receiving circuits of the mux will accept signals in the 3 to 25 volt range. The voltage

thresholds are:

Negative = voltage more negative than -3 volts with respect to signal ground.

Positive = voltage more positive than +3 volts with respect to signal ground.

SIGNAL INFORMATION:

Binary State

NEGATIVE

One

POSITIVE

Zero

Signal Condition

Control and Timing Function

Mark

Off

Space

The input impedances of all mux circuits which accept signals from the data processing terminal or CPU equipment

have DC resistances of 4.7K. For more specific details, consult the EIA RS232C standard itself.

The following chart lists the EIA RS232C interface pins and circuits present on the mux RS232C interface connector.

All other pins are unused. The composite side of the mux is configured as a DTE device and the channel sides are

DCE devices.

MULTI-TECH

EIA

CCITT

SIGNAL

CIRCUIT

ASSIGNMENT DESIGNATION CIRCUIT CIRCUIT SOURCE*

FUNCTION

RTS

CTS

DSR

103

104

105

106

107

102

109

114

115

108/2

125

113

142

DTE

DCE

DTE

DCE

——

DCE

DTE

DCE

DTE

Transmitted Data

Received Data

Request to Send

Clear to Send

Data Set Ready

Signal Ground

Data Carrier Detector

Test Voltage

Transmit Clock

Receive Clock

XTC

OOS

Data Terminal Ready

Ring Indicator

External Transmit

Terminal Busy

*DTE =Data Terminal Equipment

DCE=Data Communications Equipment

ThecomputerorterminalshouldbesuppliedwithacableterminatedwithaCinchDB25P(orequivalent)connectormountedinaCinch

DB51226-1(orequivalent)hoodassemblyasspecifiedbytheRS232C/V.24standard.

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Appendix C

Cabling Diagrams

Channel Cable

DCE to Channel cabling (with EIA pass Thru)

PIN NO.

CHASSIS GROUND (AA)

TRANSMIT DATA (BA)

RECEIVE DATA (BB)

DCE

REQUEST TO SEND (CA)

CLEAR TO SEND (CB)

DATA SET READY (CC)

SIGNAL GROUND (AB)

CARRIER DETECT (CF)

DATA TERMINAL READY (CD)

RING INDICATOR (CE)

OUT OF SERVICE/BUSY

MultiMux

Channel

Connector

Device

(Communication

Device

i.e. Modem)

DCE to Channel cabling (without EIA pass Thru)

PIN NO.

CHASSIS GROUND (AA)

TRANSMIT DATA (BA)

RECEIVE DATA (BB)

DCE

REQUEST TO SEND (CA)

CLEAR TO SEND (CB)

DATA SET READY (CC)

SIGNAL GROUND (AB)

CARRIER DETECT (CF)

DATA TERMINAL READY (CD)

RING INDICATOR (CE)

OUT OF SERVICE/BUSY

MultiMux

Channel

Connector

Device

(Communication

Device

i.e. Modem)

DTE to Channel cabling

PIN NO.

CHASSIS GROUND (AA)

TRANSMIT DATA (BA)

RECEIVE DATA (BB)

DTE

Device

(Terminal

Device

i.e. ASCII

Terminal)

REQUEST TO SEND (CA)

CLEAR TO SEND (CB)

DATA SET READY (CC)

SIGNAL GROUND (AB)

CARRIER DETECT (CF)

DATA TERMINAL READY (CD)

MultiMux

Channel

Connector

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Command Port Cables

DCE to DTE cabling

PIN NO.

CHASSIS GROUND (AA)

TRANSMIT DATA (BA)

RECEIVE DATA (BB)

DTE

MultiMux

Command

Port

Device

(Terminal

Device

i.e. ASCII

Terminal)

CLEAR TO SEND (CB)

DATA SET READY (CC)

SIGNAL GROUND (AB)

CARRIER DETECT (CF)

DATA TERMINAL READY (CD)

Connector

DCE to DCE cabling

PIN NO.

CHASSIS GROUND (AA)

TRANSMIT DATA (BA)

RECEIVE DATA (BB)

DCE

MultiMux

Command

Port

Device

(Communication

Device

DATA SET READY (CC)

SIGNAL GROUND (AB)

i.e. Modem)

Connector

DATA TERMINAL READY (CD)

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Composite Link Cabling

RS232C/V.24 *Configured Composite Link

PIN NO.

CHASSIS GROUND (AA)

TRANSMIT DATA (BA)

RECEIVE DATA (BB)

External

Synchronous

Modem/DSU

Connector

MultiMux

External

Modem/DSU

Connector

REQUEST TO SEND (CA)

CLEAR TO SEND (CB)

SIGNAL GROUND (AB)

CARRIER DETECT (CF)

TRANSMIT CLOCK (DB)

RECEIVE CLOCK (DD)

DATA TERMINAL READY (CD)

V.35 Adapter Cable Configured on a RS232C/V.35

**Composite Link

V.35 34-PIN

CONNECTOR (MALE)

25-PIN

CONNECTOR (FEMALE)

PROTECTIVE GROUND

SIGNAL GROUND

REQUEST TO SEND

CLEAR TO SEND

DATA SET READY

DATA CARRIER DETECT

DATA TERMINAL READY

TRANSMIT DATA A

RECEIVE DATA A

TRANSMIT DATA B

RECEIVE DATA B

EXTERNAL TX CLOCK A

RECEIVE CLOCK A

EXTERNAL TX CLOCK B

RECEIVE CLOCK B

TRANSMIT CLOCK A

TRANSMIT CLOCK B

* The MultiMux RS232C interface circuits have been designed to meet the

electrical specificaitons given in EIA (Electronic Industries Association RS232C

and CCITT (Consultative Committee International Telegraph and Telephone) V.24

Stanards.

** When configured for V.35 interface operation on composite link A or B, the

V.35 adapter cable should be used. This cable uses a 25-pin female connector at

one end and a 34-pin winchester male connector at the other end.

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RJ48 Cabling for Internal DSU

Receive

{

Transmit

{

1 2 3 4 5 6 7 8

Back to Back Mux Cable

25-PIN CONNECTOR (FEMALE)

Frame Ground

Frame Ground (AA)

Transmit Data

Receive Data

Receive Data (BB)

Transmit Data (BA)

Clear To Send (CB)

Request To Send (CA)

Signal Ground (AB)

Data Terminal Ready (CD)

Request To Send

Clear To Send

Signal Ground

Data Set Ready

Carrier Detect

Transmit Clock

Receive Clock

Data Terminal Ready

Internal Clock

Data Set Ready

Carroer Detect

Transmit Clock

Receive Clcok

Internal Clock

“DCE”

“DTE”

* This cable is used to connect two muxes back to back. The cable is

asymmetrical and allows one of the mux's to provide clock to the TxC and

RxC pins of the other mux. Make sure the configuration of the composite

links include one of them as having an internal clock and the other mux an

external clock.

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E&M (I-V) Voice/Fax Channel Cable

Green-White

White-Green

White-Orange

White-Blue

Blue-White

Orange-White

Input

Output

T1 4-Wire Output

R1 4-Wire Output

SG (Signal Ground) Output

SB (Signal Battery) Output

4-Wire Input, 2-Wire

Brown-White

White-Brown

RJ45 Plug

* Cable wire is solid 24AWG. If connecting to a punch block, spade lugs may be cut off.

RJ45

Spade Lug

Wire Color

Green/White

White/Green

White/Orange

White/Blue

Function

Input

Output

4-Wire Output

4-Wire Input, 2-Wire

4-Wire Output

(Signal Ground) Output

(Signal Battery) Output

Blue/White

Orange/White

Brown/White

White/Brown

Voice/Fax Channel Connectors

12345678

2345

E&M

FXO

FXS

VOICE/FAX CHANNEL

Pin Connection

E&M Description

FXO Description

FXS

Description

N/C

Ring

Tip

N/C

Tip

Ring

N/C

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Appendix D

Command Modem Commands

Answer A

The Answer Mode forces the command modem into answer mode. Entering ATA when in the

Command mode will immediately bring the command modem off-hook, out of the command mode and into the On-Line

Answer mode, and cause it to retransmit its carrier signal over the phone line. If no responding carrier tone is received

within thirty seconds (or some other time as determined by S-Register S7), the command modem will cease transmitting

its tone, hang up, and go back into Command mode.

Repeat

Last

Command

The Repeat Last Command command causes the command

modem to repeat the last command that was executed. The last

command will remain stored in the modem’s command buffer until the Attention command (AT) is

entered. Therefore AT must

not be entered before an A/ command because the A/ will have no effect if an AT command

already cleared the previous command outof the command buffer.

Bell orTone B

The B command is used to select the frequency that the CCITT Answer command modem

uses for its answer tone. The answer tone is the tone transmitted by a command modem receiving

a call; this initiates the handshaking between the two command modems.At 2400 bps there is no conflict, because all

command modems use CCITT frequencies. At the lower speeds (0-1200 bps), in the U.S., some modems use the Bell

frequency of 2225 Hz. However, the CCITT specification for V.22 has an answer tone frequency of 2100 Hz. The ATB0

command enables CCITT V.22 (2100 Hz) frequency. The ATB1 command enables Bell 212A (2225 Hz) frequency.

ATB1 is the factory default.

Dial D

The letter D in a command will cause the command modem to dial the telephone number

immediately following it. For example, if you enter ATD5551212 and hit Return, the command modem will dial the

number 555-1212. Valid dial characters are 0 through 9, A through D, # , and *. Dial modifiers are: , P R S=x T W ; @

and !. In pulse dialing, non- digit characters have no meaning. The Dial command can also be used in conjunction with a

telephone set for manual dialing. You would dial the number on your telephone set, and after hearing the high-pitched

answer tone on your handset, you would enter ATD on your keyboard and hit Return. You would then hang up the

handset. Unless you have a specific need to dial in this manner, we recommend you use the first method, where the

telephone number is entered on your keyboard.

Echo

Command

Mode

If the command modem is connected to a full duplex terminal or

computer, it will be necessary for the modem to be configured

to echo back characters entered while in the command mode in

order for them to be displayed. The E command is used to

configure the Command mode echo, with ATE0 disabling the

echo and ATE1 enabling the echo.

Characters

E0-1

If neither method is selected, the factory default will cause the

modem to echo the command characters.

Load

The Load Command Modem Factory Default &F Command

Command

resets the S-Registers and command modem commands to the Modemfactory default values.

They are as follows:

Factory Defaults

S-Registers: S0=0, S1=0, S2=43, S3=13, S4=10, S5=8, S6=2,

S7=30,

S8=2, S9=6, S10=14, S11=95, S12=50,

Commands:

S18=0, S25=5, S26=1, and S28=0.

Command

Name

Default

Answer Tone:

Echo:

Dialing:

Bell

Enabled

Pulse

Result Codes:

Result Code Set/

Call Progress:

Enabled

Word

Dial Tone & Busy

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Hanging Up,

and

You

can

Off

make

Hook,

the

with

command

the

modem

command.

hang

Entering

(go

ATH1

Hook),

(upper

case)

Bringing the

Phone Line

Off Hook

will bring the line Off Hook just as if you had picked up the

telephone handset. The command modem remains in command

mode.

H0-1

You

can

hang

entering

ATH0

ATH

(remember

that

the

default value is 0 when nothing is entered). It is not necessary to

usethe H1commandto

bring the line Off Hook when using the

off hook automatically when you hit

command modem D command to dial,since the modem will

Return at the end of the Dial command.

g o

Inquiry for

Product

Code

Some

the

ing,

systems

“identification”

by using

or software packages may

automatically

they are

command

check

communicat-

enables the

of the modem which

with

This

the

command. “read”

software to determine the type of modem with which it is commu-

nicating.

When ATI or ATI0 (upper case) is entered, the command modem

with the first two digits indicating model, and the third digit indicating the revision level.

will respond with xxx,

Exiting

You

can

bring

the

command modem out of command

mode

back

Command

Mode,

into the On-Line Mode, by entering ATO (where is the letter O,

not

the

number

0).

this

case,

the

command

reverses

what

Going Back

On-LIne

was

explanation).

done

entering

the

Escape

code

(see Escape

Code

+++

Pulse or

Tone

Dialing

closing

The

tone

command

dialing,

modem

will

combination

dial

numbers

of both

using

methods.

timed opening and

that used

either

pulse

Pulse

dialing

is the method used by rotary-dial telephones, which involve the

line relay. Tone dialing

by push button Touch-Tone telephones, and is sometimes

referredtoasDTMF, or

Dual-Tone Multi-Frequency dialing.

This is controlled by including

dialing command, right before

in that manner.

the

for Pulse or

digits you

wish

for Tone in the

have

dialed

For

entering

example,

you

would

and

pulse-dial

hitting

the

Return.

number

You

555-1212

ATDP5551212

could

tone-dial

the same number by entering ATDT5551212 and hitting Return.

If neither Pulse or Tone dialing is specified in the dialing com

mand, the command

modem will use whatever method was last

used. If the modem was reset or just powered up, it will use Pulse

dialing, even if you do not use the letter P in your dial command.

Nearly

tone

all

dialing.

telephone

Since

systems

that is

the

faster

U.S.

are

method,

now

you

compatible

with

will probably

choose the tone method for your dialing.

An example of combining pulse

and

tone

dialing

could

involve

PBX system where had to be pulse-dialed first, then the rest of

the number tone-dialed after pausing for second dial tone. The

number would be dialed by entering ATDP9,T5551212 and hitting Return. (The

comma causes a pause, which we’ll explain soon.)

Result Codes

Enabled or

Disabled

It may be desirable to disable the Result Codes (see

altogether in certain applications, such as computer-controlled

command is used do

transmissions and

not select

command)

auto

disabling

enabling

dialing.

The

Result

this,

ATQ0

method,

with

(or

ATQ1

ATQ)

the

them.

Code

Q0-1

you

either

the

factory

default setting will enable the Result Codes to be sent.

Forcing an

Answer

Tone,

To dial up another modem that

initiate

Originate

the

mode,

"handshaking"

automatically

your

modem must be in Answer mode

and establishment of connection.

This

done

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in the

Dialing

when

dialing command. When this is done, the command modem will

soon as the number

and then transmit a carrier signal to the other modem.

the

command

letter

entered

the

end

switch to Answer mode

dialed

For example, entering ATD5551212R

cause the number 555-1212 to be dialed and cause the com-

and

hitting

Return

mand modem to

the dialing

would

transmit

carrier

signal

the

end

sequence.

S-Register

Read or

Write

The

the

command can be used to both assign

value to or read

toAppendix of this

readinganS-registeris

current value of an S-Register. (Refer

manual for the function of each S-Register.) The format for

the letter

followed by the register number and a question mark ? and then

SN=xxx

enter

(upper

hit

case)

Return. For

Sn?

example, entering ATS7? and hitting Return will

displaythevalueofS-Register7ina3digitDecimal

form. The

number 30 would appear as 030, and the number 255 would

appear as

255.

The format for assigning a value to an S-register is to enter the

letter S followed by the

number

and then enter the new value in a decimal format. ASCII

be converted to their decimal equivalents

character Code/Hex/Decimal conversion chart

followed

equal

characters will have to

sign,

before being entered. S-Register decimal values can range from

for ASCII charactercso, mplete AoSrCII

is located in Appendix A.

127

you

from

For example, if

wish

to have longer

pauses

caused

the value for the S-

pause five seconds for the comma in the dialing command

instead of the normal two). Or, if you wish to configure the command modem to answer incoming

instead of after the first ring, enter ATS0=30 and hit Return to

the

comma in a dialing command, enter ATS8=5 to assign 5 as

calls after the 30th ring,

assign the value 30 to S-Register S0.

Once an S-Register is selected, it remains selected until another

The value of that S-Register can then be

value.

read by entering AT? and changed by entering AT= and the new

Result

Codes-

Word or

Digit

The

supervisory

(“verbose”) or single digit (“terse”) form.

command

modem

can

display

codes

its

can

Result

appear

Codes

either

your

word

console.

These

For

example,

after

dialing,

carrier

signal

detected,

the

V0-1

result can be displayed either as NO CARRIER or as the digit 3.

The V command is used to determine which method is used.

Entering ATV0 will cause the command modem to display the

display them as words.If you

Result Codes as digits,

not select

while ATV1

will

meth

cause the command modem to use the verbose results.

The following shows the terse and verbose result codes and a

description of each

code.

Terse

Verbose

Description

Your command was executed without errors.

A carrier signal has been detected 300 bps.

A ring signal has been detected from an

CONNECT

RING

incoming call.

carrier signal was lost.

No carrier signal has been detected, or the

CARRIER

ERROR

An error is present in your command

many characters.

sequence, e.g. invalid characters or too

CONNECT

A carrier signal has been detected at

1200

1200 bps.

CONNECT

2400

A carrier signal has been detected at

2400 bps.

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modem during auto answer.

DATA

Command modem connected as data

You can also choose to completely eliminate the display of all of the

This is accomplished by executing the Q command.

Result Codes.

View Active

The View Active Configuration and User Profiles &V command

Configuration displays the

commands and S-Register settings along with the

and User Profiles

stored telephone numbers. A typical

example of active and

stored profiles and stored telephone numbers are as follows:

ACTIVE PROFILE:

B1 E1 H0 Q0 V1 X4 Y0 &G0 &P0 &T4 &Y

S00:000 S01:000 S02:043 S03:013 S04:010 S05:008 S06:002 S07:030

S08:002 S09:006

S10:014 S12:050 S14:AAH S16:00H S18:000

S21:00H S22:76H S23:07H S25:005 S26:001S027:40H S28:00H

STORED PROFILE 0:

B1 E1 H0 Q0 V1 X4 Y0 &G0 &P0 &T4

S00:000 S14:AAH S18:000 S21:00H S22:76H S23:15H S25:005

S26:001S027:40H

S28:00H

STORED PROFILE 1:

B1 E1 H0 Q0 V1 X4 Y0 &G0 &P0 &T4

S00:000 S14:AAH S18:000 S21:00H S22:76H S23:17H S25:005

TELEPHONE NUMBERS:

&Z0= 18009722439

&Z1= 6127859875

&Z2=

&Z3=

Wait for Dial Tone The W command causes the command modem to wait up to a

dial tone to occur. The telephone number

S7 value determines the maximum wait time. If a busy signal is

specified time for the

is dialed immediately upon dial tone detection. The S-Register

detected instead of dial tone, the

command modem returns a

BUSY result code and goes On-Hook, abandoning subsequent

instructions on the command line. The factory default setting is

30 seconds

Store Active

The Store Active Profile &W command writes the storable

Profile parameters of the

active configuration to one of two profiles in

NVRAM. The current values of the following commands and

&W0-1

registers are stored:

Commands: Bn, En, Qn, Vn, Xn, &Gn, &Pn, and &Yn

S-Registers: S0, S14, S18, S21, S22, S23, S25, S26, S27, and S28

The &W0 command stores the active profile in the NONVRAM

at location zero and

&W1 stores the active profile in location one.

&W0 is the factory default setting.

Result Code Set/ The Result Code Set/Call Progress (X ) command selects which CallProgress

set of

responses and dialing functions are active in Command mode. You can choose to have certain

responses suppressed, such as the speed of the connection, and whether or not dial tone

busy signal are detected. You can choose either the basic result code set (i.e., the connect response with

indication of the called command modem) or the extended result

and

no speed

code set (i.e., connection response with speed indication) and

whether or not call progress is activated.

The ATX0 and ATX1 commands disable the call progress

and busy signal) and activates either the basic or extended result codes. This call progress method is

referred to as dumb dialing where actual dial tones are not

functions (dial tone

detected, instead the command modem

both commands.

relies on timed

pauses. The ATX0 enables the basic result codes while the ATX1

enables the extended result codes with call progress disabled on

The ATX2 through ATX4 commands determine whether or not

activated and extended result codes are enabled on each of these commands.

call progress is

The ATX2 command waits for a dial tone before dialing. The

speed indication (e.g.,CONNECT xxxx

upon detection of a dial tone. Busy signal is not detected.

connect response and

where as xxxx is the connect speed of 2400 bps) are enabled

The ATX3 command causes the command modem to dial

blind(i.e., does not

wait for dial tone) and enable a BUSY result

code if a busy signal is detected. This feature is useful because

rather than wait the

it allows the command modem to immediately abandon a call

thrity seconds for a carrier signal that will

never come.

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The ATX4 command causes the command modem to wait for a

dial tone before

dialing. This command is referred to as the smart

dialing method where as the ATX3 command is referred

to as

blind dialing. The CONNECT xxxx result codes are activated and the BUSY

result code is enabled if a busy signal is detected from

the called command modem. The ATX4

command is the factory

default setting.

The Result Code Set/Call Progress X commands are summa-

rized below.

and busy

ATX0 Basic result codes are enabled. Dumb dialing (dial tone

signal) capability is provided.

ATX1 Extended result codes are enabled. Dumb dialing

capability is

result codes

codes. Busy

provided.

ATX2 Wait for dial tone before dialing is enabled. Extended

are enabled. Busy signal is not detected.

ATX3 Blind dialing is enabled along with extended result

result code is enabled if the busy signal is

detected.

ATX4 Smart

dialing

enabled

provides dial tone and busy signal detec

tion. ATX4 is the factory default setting.

Select Stored

profile is established on power up or reset of the

profile 0 and &Y1 selects stored profile 1 on power up or reset. The profile

using the &W command. &Y0 is the factory default setting.

The Select Stored Profile on Power Up &Y command determines Profile on Powerwhich stored

Up command modem. The &Y0 command selects stored

&Y0-1is stored

Recall

Stored

The Z command causes the command modem to retreive the

stored configuration from non-volatile memory (NVRAM) and

Profilesstore it in the active

configuration area. The command mode

buffer is cleared after the Z command is executed. The ATZ0

Z0-1

command loads profile 0 into the active configuration area and

ATZ1 command loads profile 1. The active profiles are stored

using the &W

command and viewed using the &V command

which are explained earlier in this section.

Store Telephone

The Store Telephone Number &Z command causes the com-

Number mand modem to store

up to four strings of telephone numbers

into NVRAM for later recall by the Dial Stored Number ATDSx &Z0-3=x

command. The format for this command is &Z and up to a 36

character telephone number and/or dialing

modifiers which are

stored at location 0. If the command format is &Z= (=is a delimiter)

with no number preceding the delimiter, this telephone

number is also stored at location 0. If the format

of this command

is &Zx= where the number preceding the delimiter is between 0 and 3, the

telephone number and/or dialing modifiers are stored

at the loaction specified by the number preceding the

delimiter.The

following

characters

are

allowed

T P R W # * , ! ; along with the delimiter (=).

Dial Digits/

Digits 0 through 9 and characters A through D, # and * are valid

Characters

dial

characters. Characters A through D, # and * represent

specific tone pairs and therefore, can be used

only when tone

0 to 9, A to D, dialing.

# and *

Wait for Quiet

The Wait for Quiet Answer @ command causes the command

Answer modem to look for

rings followed by 5 seconds of silence before

processing the next symbol in the dial command. This command

is used

for

accessing

system

that

determines the maximum wait time. If Quiet

Answer is detected, the dial modifiers following the command are

executed. If busy is detected, the command modem returns a

BUSY result code and

goes to the hang-up process, aborting

further execution of commands.

Flash On Hook

The Flash On Hook ! command causes the command modem

to to go on hook for

0.75 second. Some switch-board systems

react to a momentary on hook state. An exclamation point

inserted in the dialing command causes the command to flash

on hook for three-quarters of a second, just as if

you had

depressed the disconnect button (on the handset cradle)

momentarily.

Automatic

Pauses in

Dialing

You can cause the command modem to pause during the

dialing sequence by entering a comma character where the

pause is desired. This pause will last two seconds. If a longer

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pause is desired, more than one comma may be entered

consecutively, with each one causing a two second pause. You also have the option of changing

the length of the pause of the comma, from two seconds to any other value from 0 up to 255 seconds. This is

accomplished by accessing S-Register S8, which we explain in Appendix E.

Each comma used in a dialing command does count as one of the forty allowed characters.

Returning to

Command

Mode

After Dial

Command

Execution

A semicolon (;), when entered as the last character of a dialing

command, will cause the command modem to return to the

Command mode immediately after executing the command,

instead of waiting for a carrier signal and going on line.

For example, entering ATDT5551212; would simply tone-dial the number, and do nothing

afterwards except go back into

;

Command mode. This can be useful in dialing applications where command

modem data transfer is not desired, such as voice communications.

Escape

It is possible to cause the command modem to enter the com-

Sequences-

Entering

Command

Mode While

Still On-Line

mand mode after the command modem has gone on-line

without disconnecting the call. This is accomplished by entering

an Escape code. The default Escape code is three plus

signs (+++). You need not hit Return.The Escape code character

may be changed by accessing S-Register S2 which is explained in Appendix E.

+++

There is a safety factor built into the command modem, that requires about one second of silent

time before and after the Escape code +++ is entered, to prevent accidental escapes into the Command mode. The

command modem will not release the telephone line until it receives an ATH or ATZ command, or it detects loss of

carrier.

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Appendix E

Indicators/Switches and Connectors

Indicators

FigureE-1. MultiMuxFrontPanel

Table E-1. LED Indicators

Indicator

Description

Channel

XMT/RCV

The Channel Transmit (XMT) and Receive (RCV) indicators show the activity level on each channel.

MultiMux MMV1608 uses Channel One through Channel Eight indicators, MMV1616 uses

Channel One through 16, MMV3224 uses Channel One through Channel 24, and finally

MMV3232 uses Channel One through 32.

The Flow Control (FC) indicator is On when the MultiMux has stopped the channel data, because the

channel cannot accept any more data. If the channel data is being stopped by a remote

device, the FC indicator on the host MultiMux lights. The Flow Control Received (FCR)

indicator on the affected composite link also lights. If the channel data is being stopped by one

of the composite links, only the FC indicator for the affected channel lights.

Table E-1. LED Indicators (Continued)

Description

Indicator

Composite Link A/B

The Carrier Detect (CD) indicator lights when the composite link detects a carrier signal from the

remote MultiMux. The CD indicator lights when a carrier signal is detected for an internal DSU

and when an external device (DSU or composite link modem) is connected to the composite

link, and is detecting a valid carrier.

RCV

XMT

CTS

RXT

The Receive (RCV) indicator flashes as data is being received from the remote multiplexer.

The RCV indidator flashes for both internal DSU and an external link device.

The Transmit (XMT) indicator flashes as data is being transmitted to the remote multiplexer.

The XMT indicator flashes for both internal DSU and an external link device.

The Clear To Send (CTS) indicator lights when the composite link is ready to transmit data.

The CTS indicator lights for both internal DSU and an external link device.

The Retransmit (RXT) indicator lights when the local MultiMux has received a request to

retransmit a block of data and is retransmitting that block. The RXT indicator lights for both

internal DSU and an external link device.

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FCR

The Flow Control Received (FCR) indicator lights when the remote MultiMux's buffers are full and the

local MultiMux has been told to stop sending data. The FCR indicator will only come On when

flow control is active. The FCR indicator lights for both internal DSU and an external link

device.

The Remote Down (RD) indicator lights when the local MultiMux cannot extablish communications

with the remote MultiMux. The RD indicator lights for both internal DSU and an external link

device.

TM The Test Mode (TM) indicator lights when the MultiMux is placed in test mode. Refer to Chapter 7 for test

mode operation.

Table 3-1. LED Indicators (Continued)

Indicator

Description

Command Modem

CD Indicates the local command modem has detected a carrier signal from a remote command modem.

RCV/XMT

Indicates that the command modem is on-line by flashing with data activity between the two

command modems.

OH Indicates that the dial-up line for the command modem is off-hook.

Voice/Fax Channels

FXSThe Foreign Exchange Station (FXS) indicator lights when the designated channel is configured for FXS operation.

FXOThe Foreign Exchange Office (FXO) indicator lights when the designated channel is configured for FXO operation.

E&MThe Ear and Mouth (E&M) indicator lights when the designated channel is configured for E&M operation.

VCEThe voice (VCE) indicator lights when voice traffic is active on the designated channel.

FAXThe FAX indicator lights when fax traffic is active on the designated channel.

XMTThe transmit (XMT) indicator lights when voice or fax data is being transmitted on the designated channel.

RCVThe receive (RCV) indicator lights when voice or fax data is being received on the designated channel.

XSGThe transmit signal (XSG) LED lights when the FXS configured channel is off-hook, the FXO configured channel is

receiving a ring from the telco, or the M lead is active when the voice/fax channel is configured

for E&M opeation.

RSGThe receive signal (RSG) LED lights when the FXS configured channel is ringing or the E lead is active on the

E&M configured channel.

The test mode (TM) indicator lights when a test is being performed on a voice/fax channel.

Back Panel

The cable connections for the MultiMux are made at the back panel. Refer to Chapter 4 for cabling installation

procedures. Refer to Appendix D for cabling diagrams. The MultiMux back panel is shown in Figure E-2.

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Figure E-2. Back Panel

ON/OFF Switch

This switch provides AC power to the MultiMux when placed in the On (UP) position and removes power when in the

OFF (down) position.

Power Connector

The power connector is a receptacle for the 3-prong grounded power cord supplied with the MultiMux.

CHANNEL 1-16, CHANNEL 1-32

Channel 1 through channel 16 or channel 1 through 32, depending on MultiMux model, are used to connect the async

devices. These connectors provide the RS232C connection.

2400 BPS MODEM DIAL-UP LINE Connector

This connector is used when the command modem is connected to a separate dial-up line for remote access.

COMMAND PORT TERMINAL/PC Connector

The command port terminal/pc connector is used to connect the supervisory console to the MultiMux. The supervisory

console can be either an ASCII terminal or a pc with a serial port running communications software. The command

port connector has a DCE physical interface with a DB25 female connector.

COMPOSITE LINK A INTERNAL DSU Connector

The composite link A internal DSU connector is used to connect the internal DSU on link A to the DDS or dedicated

network . This connector provides an RJ48 connection.

COMPOSITE LINK A EXTERNAL MODEM/DSU Connector

The composite link A external modem/DSU connector is used when either a compatible external composite link modem

or external DSU is connected to the MultiMux. This connection can be either RS232C or V.35. If the connection is

V.35, then the composite link A shunt on the aggregate board must be moved from the RS232C (default) position to the

V.35 position. This connector is a DB25 female connection.

COMPOSITE LINK B INTERNAL DSU Connector

The composite link B internal DSU connector is used to connect the internal DSU on link B to the DDS or dedicated

network . This connector provides an RJ48 connection.

COMPOSITE LINK B EXTERNAL MODEM/DSU Connector

The composite link B external modem/DSU connector is used when either a compatible external composite link modem

or DSU is connected to the MultiMux or the connection is used to connect a synchronous device. This connection can

be either RS232C or V.35. If the connection is V.35, then the composite link B shunt on the aggregate board must be

moved from the RS232C (default) position to the V.35 position. This connector is a DB25 male connection.

VOICE/FAX CHANNEL 2 E&M Connector

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The voice/fax channel 2 E&M (Ear and Mouth) connector is used to connect channel 2 of the MultiMux to the trunk side

of the local private branch exchange (PBX, a small switch). This connector is used when the voice/fax feature is

included in the MultiMux. The E&M connector is an RJ48S 8-position keyed jack.

VOICE/FAX CHANNEL 2 FXS Connector

The voice/fax channel 2 FXS (Foreign Exchange Station) connector is used to connect channel 2 of the MultiMux to a

station instrument (telephone, KTS - key telephone system, or fax machine). This connector is used when the voice/fax

feature is included in the MultiMux. The FXS connector is an RJ11 jack.

VOICE/FAX CHANNEL 2 FXO Connector

The voice/fax channel 2 FXO (Foreign Exchange Office) connector is used to connect channel 2 of the MultiMux to the

station side of the local private branch exchange (PBX, a small switch). This connection is also commonly referred to

as an OPX - Off Premises Extension. This connector is used when the voice/fax feature is included in the MultiMux.

The FXO connector is an RJ11 jack.

VOICE/FAX CHANNEL 1 E&M Connector

The voice/fax channel 1 E&M (Ear and Mouth) connector is used to connect channel 1 of the MultiMux to the trunk side

of the local private branch exchange (PBX, a small switch). This connector is used when the voice/fax feature is

included in the MultiMux. The E&M connector is an RJ48S 8-position keyed jack.

VOICE/FAX CHANNEL 1 FXS Connector

The voice/fax channel 1 FXS (Foreign Exchange Station) connector is used to connect channel 1 of the MultiMux to a

station instrument (telephone, KTS - key telephone system, or fax machine). This connector is used when the voice/fax

feature is included in the MultiMux. The FXS connector is an RJ11 jack.

VOICE/FAX CHANNEL 1 FXO Connector

The voice/fax channel 1 FXO (Foreign Exchange Office) connector is used to connect channel 1 of the MultiMux to the

station side of the local private branch exchange (PBX, a small switch). This connection is also commonly referred to

as an OPX - Off Premises Exchange. This connector is used when the voice/fax feature is included in the MultiMux.

The FXO connector is an RJ11 jack.

Switches and shunts

Switch settings can be changed by taking off the front panel and locating the switches on either the aggregate or

channel board(s). The initiate downline load, external/internal DSU, channel size, and remote access to the command

modem DIP switches are located on the Aggregate board. The channel board(s) contian the switches that indicate

which channel numbers that particular board represents, 1-8, 9-16 etc. The pc board orientation, switches and shunts

are shown in Figure E-3.

Chassis

Channel Board

Aggregate Board

Voice/Fax Board

V.24/V35 Shunts

Channel

Switch SW-5

Designation

Switches

Switch SW-6

(Future Use)

Figure E-3. Switches and Shunts

Aggregate Board Switch SW-5

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The aggregate board 8-position DIP switch SW-5 is shown in Figure E-3 and the function of each position is as follows:

Switch position 1:

Closed

Open(UP)

Initiate Downline Load Off

Initiate Downline Load On

(used for downline loading only)

Switch position 2:

Switch Position 3:

Closed

Open (UP)

External Link A Device Selected

Internal Link A DSU Selected

Closed

Open (UP)

External Link B Device Selected

Internal Link B DSU Selected

Channel #

Switch Position 4:

Switch Position 5:

C= Closed, O=Open

Switch Position 6:

(default)

Closed

Open (UP)

Disable Command Modem Remote Access

Enable Command Modem Remote Access

Switch Position 7: Not Used

Switch Position 8: Not Used

Channel Board Number of Channels Switch

The Channel board four-position DIP switch determines which channel numbers a particular channel board represents.

The first channel board needs to be installed in the third slot from the bottom of the chassis and the 4-position DIP

switch on that board has to be set with switch positions SW-1 and SW-2 in the closed position. If the MultiMux has 16

channels, then two channel boards are installed in the chassis and the channel board in the fourth slot from the bottom

of the chassis has switch position SW-1 in the open position and SW-2 in the closed position. The function of the

switch is as follows:

Channel #

1-8

9-16

17-24

25-32

Switch Position 1:

Switch Position 2:

C= Closed, O=Open

RS232C/V.35 Shunt

An external composite link modem or DSU with either an RS232C/V.24 or a V.35 interface can be connected to a

MultiMux MMV1600/3200 series. The aggregate board has four shunt locations on the board, two positions for

composite link A and two for composite link B and each link can connect either an RS232C or a V.35 interface. When

an external composite link modem with an RS232C/V.24 interface is connected to one of the composite links, the V.24

shunt for that composite link is installed on the aggregate board. When the external composite link modem or DSU has

a V.35 interface, the shunt for that composite link has to be moved from the default position (RS232C/V.24) to the V.35

position. The shunts are shown in Figure E-4. The factory default position for the shunts is in the RS232C/V.24

position.

Figure E-4. RS232C/V.35 Shunts

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Appendix F

Flow Control Background

Flow control refers to the techniques used by computer devices and multiplexers to stop and restart the flow of data

from each other. Flow control is necessary so that a channel device does not receive more data than it can handle or

vice versa (the MultiMux receives more data than its buffers can accommodate). Flow control by the mux to control data

flow from a channel device is called Mux Initiated Flow Control. Such flow control might be needed if a mux was

connected to a minicomputer that could output more data than the mux could handle. Flow control by the channel

device to control data flow from the mux is called Channel Device Initiated Pacing. Such pacing might be required by a

printer channel device which could not print data as fast as the mux might send it or might go off-line for some reason

like running out of paper. To state it simply, “Flow Control” is something the mux does to the channel device, while

“pacing” is something the channel device does to the mux.

MUX INITIATED

CHANNEL DEVICE

FLOW CONTROL

INITIATED PACING

DATA

Channel

Device

Channel

Device

Mux

Pacing stops the output

of data from the mux

Flow control stops the

input of data to the mux

Flow control can be software or hardware based. In software flow control, special characters (Xon and Xoff) are used to

stop and start the flow of data. In hardware flow control the Clear To Send (CTS) signal on the RS232C interface (pin

5) is brought low to stop data and high to restart it. When you select a flow control method with a mux command you

are also selecting the corresponding pacing method.

In the example below we have an eight port multi-user minicomputer connected to a MultiMux on one end of a link and

seven terminals plus a printer connected to another MultiMux on the other end of the link. The MultiMux at the printer

end needs Flow Control and Pace on the printer channel to stop and restart data from the minicomputer. The MultiMux

at the minicomputer end needs Flow Control on to all channels to stop and restart data from the minicomputer so that

the mux’s buffer capacity is not exceeded. We chose Xon/Xoff flow control for this example and are setting pace ON

for all channel devices.

NODE 1

NODE 2

Channel

Printer

Link

Mini-

Computer

Mux

MiniComputer Flow Control

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In the example below, the flow control on the minicomputer works as follows:

Channel

Link

Mini-

Computer

Mux

Data

mux process

data to the link

Flow Control

mux buffers

full

off

Flow Control

mux buffers

empty

Data

mux processes

data to the link

A. Data volume from the mini for any particular channel is appropriate for the mux to process and transfer

on to the link.

B. Data overwhelms a channel's mux buffer and the mux sends a stop data Flow Control (OFF) signal to the

mini stopping data output.

C. The mux buffer sufficiently enpties to allow additional data transfer, so the mux sends a start data Flow

Control (ON) signal to the mini.

D. Data from the mini again flows through the channel.

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Printer pacing and Flow Control

The example below shows how Pacing and Flow Control work on a printer.

(Host)

Mini-

Computer

Channel

Link

(Remote)

Printer

MUX

Print Data

Printer Prints

Data

Pace

off

Print Buffer

Full

Flow Control

off

Flow Control

off

Pace

Printer

Ready

Flow Control

Print Data

Printer Prints

Data

A. Print data volume from the mini is appropriate for the printer to process and print it.

B. The printer cannot handle any more data due to its buffers being full and it issues a Pace OFF signal to

the mux.

C. The remote mux sends a Flow Control OFF signal to the other mux and uses its buffer to store any

pending print data.

D. The host mux sends a Flow Control OFF signal to the mini and uses its buffer to store any pending print

data.

E,F,G. The printer buffer empties and is ready for more print data, so it issues a Pace ON signal which, in

turn, causes a Flow Control ON signal through to the mini.

H. Print data from the mini resumes.

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Glossary of Terms

AC (Alternating Current): A power source whose signal crosses a reference voltage (usually called ground or zero). Alternating

between a maximum and minimum voltage, AC may also be referred to as a bipolar signal. Contrast with DC.

ACK (ACKnowledgement code) (pronounced "ack"): A communications code sent from a receiving modem to a transmitting modem

to indicate that it is ready to accept data. It is also used to acknowledge the error-free receipt of transmitted data. Contrast with NAK.

Address: A numbered location inside a computer. It's how the computer accesses its resources, like a video card, serial ports,

memory, etc.

Alphanumeric: The basic character set which includes the letters A to Z (and a to z) and the digits 0 to 9.

Amplitude: The difference between the maximum and minimum voltages of a waveform expressed as a "peak-to-peak" voltage.

Amplifier: An active device within a circuit which increases the voltage level of all signals (desirable and undesirable).

Analog loopback: A modem diagnostic used to test either the local analog loop (the modem's internal circuitry) or the remote analog

loop (the telephone line). The local analog loop test is accomplished by activating the self-test mode and tying the modem's modulator

to its demodulator and examining the return stream of data at the PC or terminal it services. The remote analog loopback can only be

activated on four-wire leased line connections with a remote modem capable of performing the same test.

Analog signal: A waveform which has amplitude, frequency and phase, and which takes on a range of values between its maximum

and minimum points. Analog implies continuous movement from point A to point B, as opposed to discrete jumps. For example, sound

is continuously varying air vibrations and is converted into analogous electrical signals to be carried on a telephone line.

Analog Transmission: One of two types of telecommunications which uses an analog signal as a carrier of voice, data, video, etc. An

analog signal becomes a carrier when it is modulated by altering its phase, amplitude and frequency to correspond with the source

signal. Compare with digital transmission.

ANSI (American National Standards Institute) (pronounced "ansy"): A U.S. standards organization supported by over 1000

companies and trade organizations. It is a non-profit, non-government group that is the U.S. member of the ISO (International Stan-

dards Organization).

ANSI character set: An 8-bit character set that contains 256 characters. The first 128 characters are alphanumeric punctuation and

the second 128 contain math and foreign language symbols.

ASCII (American Standard Code for Information Interchange) (pronounced "askey"): A binary code for data that is used in

communications and in many computers and terminals. The code is used to represent numbers, letters, punctuation and control

characters. The basic ASCII code is a 7-bit character set which defines 128 possible characters. The extended ASCII file provides 255

characters.

Asynchronous Transmission: The transmission of data in which each character is a self-contained unit with its own start and stop

bits. This is a common method of transmission between a computer and a modem. One character at a time, encoded into a series of

electrical pulses, is transmitted or received. This is the oldest method of data transfer. When it is used with error correcting software

and data compression algorithms, along with the increase in maximum attainable speeds, it continues to be a viable alternative to

synchronous transmission..

Auto Answer: A modem feature which enables the modem to go "off-hook" when it detects an incoming call.

Auto Dial: Some modems provide this feature for asynchronous dialing. This feature is a predefined macro that allows the user to

enter the location of a phone number (i.e., N0 through N9) and have the modem go off hook, dial and establish the connection. With the

auto dial feature, an asynchronous terminal can establish a dialing directory without running a communication software package.

Baud: Baud is rate, the signalling rate of a line, the switching speed, or the number of transitions (voltage or frequency changes) that

are made per second. Transmission speeds are often expressed in baud, though bits per second is more accurate. The speed at which

your computer talks to your modem.

BCC (Block Check Character): An error control method used in character-oriented or byte-synchronous protocols. Two 8-bit BCC's

are used to create the CRC (Cyclic Redundancy Check) field of a synchronous data packet.

Bell 103: The U.S. modulation standard for 300 bps full-duplex transmission over dial-up lines.

Bell 212A: The U.S. modulation standard for 1200 bps full-duplex transmission over dial-up lines.

Binary: A numbering system based on two digits, 1 and 0 which is conducive to the two-state digital electronics used within computers.

All input to a computer is encoded as a binary value. Binary also refers to a file format that uses 8-bit characters, to allow for control

characters (i.e., all non-ASCII files).

BSC (Binary Synchronous Communications): Also called "bisync", this communications protocol was the first synchronous data

format used by IBM. It is still in use, but is rapidly being replaced by IBM's newer Synchronous Data Link Control (SDLC). Bisync is a

byte-synchronous protocol that has longer delays and more overhead than the bit-synchronous SDLC. It uses two synchronization

characters to head every packet.

Bit (Binary digIT): A bit is the basis of the binary number system. It can take the value of 1 or 0. Bits are generally recognized as the

electrical charge generated or stored by a computer that represent some portion of usable information.

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Bit-synchronous transmission: A synchronous form of data transmission that focuses on a maximum packet size rather than the

length of the characters the packet contains. SDLC is a bit-synchronous protocol.

Boot: To start or restart your PC. This term originates from the saying " to pull oneself up by the bootstraps".

Bps (bits per second): A unit to measure the speed at which data bits can be transmitted or received. Bps differs from baud when

more than one bit is represented by a single cycle of the carrier.

Buffer: A temporary storage register or Random Access Memory (RAM) used in all aspects of data communications which prevents

data from being lost due to differences in transmission speed. Keyboards, serial ports, muxes and printers are a few examples of the

devices that contain buffers. A buffer allows one device to dump data at a high speed and for the lower-speed device to accept it at its

own pace. In this way , the high-speed device can continue its work without having to wait for its data transfer to end. Buffers are a way

of preventing potential data loss.

Bus: A common channel between hardware devices either internally between components in a computer, or externally between stations

in a communications network.

Byte: The unit of information a computer can handle at one time. The most common understanding is that a byte consists of 8 binary

digits (bits), because that's what computers (PCS) can handle. A byte holds the equivalent of a single character (such as the letter A).

Capacitor: An electronic device that stores an electrical charge. It comes in varying sizes for use in anything from power supplies to

the tiny cells in dynamic RAM chips. When the device is powered down, it's capacitors lose their charge.

Carrier signal: An analog signal with known frequency, amplitude and phase characteristics used as a transport facility for useful

information. By knowing the original characteristics, a receiver can interpret any changes as modulations, and thereby recover the

information.

CCITT (Consultative Committee for International Telephone and Telegraph): An advisory committee created and controlled by the

United Nations and headquartered in Geneva whose purpose is to develop and to publish recommendations for worldwide standardiza-

tion of telecommunications devices. CCITT has developed modem standards that are adapted primarily by PTT (post, telephone and

telegraph) organizations that operate telephone networks of countries outside of the U.S..

Character set: One of a number of coding schemes which uses binary digits to represent characters, numbers, punctuation, and/or

control characters. Common character sets are ASCII, ANSI or EBCDIC.

Checksum: A control field found in synchronous data packets which contain the results of the error control algorithm used.

Chip: Also called integrated circuits (IC), they are squares or rectangles that contain from a few dozen to a few million electronic

components.

Circuit: Any closed path through which electrical current can flow.

Circuit-switched Network: A technology used by the PSTN that allocates a pair of conductors for the exclusive use of one communica-

tion path. Circuit switching allows multiple conversations on one talk path only if the end-users multiplex the signals prior to transmis-

sion.

Circuit switching: The temporary connection of two or more communications channels using a fixed, non-shareable path through the

network. Users have full use of the circuit until the connection is terminated.

Clock: A timing signal generated by an oscillating circuit which is used to synchronize data transmissions.

Command: An instruction that tells a computer to begin, continue or end a specific operation.

Command mode: One of two states of an intelligent (i.e. programmable) device. The mode in which commands can be issued to alter

operating parameters.

CRC (Cyclic Redundancy Check): A field used in packetized data that contains two 8-bit BCCs ( Block Check Characters) as the

binary result of an algorithm performed on the data bits in the packet. A CRC is used for error detection by many synchronous protocols.

CTS (Clear To Send signal): With communications between modems, an RS-232 signal sent from the modem to the DTE that

indicates it is ready to accept data. Contrast with RTS.

DC (Direct Current): This is usually understood to mean a constant voltage supply that fluctuates only a nominal amount. An analog or

digital signal that may vary in voltage level, but it never crosses the reference voltage (usually called ground). Contrast with AC.

De facto standards: A de facto standard is one of two types of voluntary standards recognized by a given market. It is introduced by a

single vendor and becomes a standard by its widespread use and acceptance by other vendors. AT&T's Bell 212A, IBM's Binary

Synchronous Protocol or DEC's VT-100 terminal protocol are examples of de facto standards. Compare with de jure standards.

De jure standards: A de jure standard is one of two types of voluntary standards. It represents the collective consensus of the industry

and users for a particular aspect of manufacturing. CCITT's V and X standards (e.g. V.32 and X.25) are examples of de jure standards.

Compare with de facto standards.

Decibel (dB): A unit of measurement for signal strength based on logarithmic increments. A decibel is a relative measurement that is

derived from an initial reference level and a final observed level.

Default: This is preset value or option in software packages, or in hardware configuration, that is used unless you specify otherwise.

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Device driver: Software that controls how a computer communicates with a device, such as a printer or mouse.

Digital signal: Digital devices, such as terminals and computers, transmit data as a series of electrical pulses which have discrete

jumps rather than gradual changes.

Digital Transmission: A method of electronic information transmission common between computers and other digital devices. Analog

signals are waveforms: a combination of many possible voltages. A computer's digital signal may be only "high" or "low" at any given

time. Therefore, digital signals may be "cleaned up" (noise and distortion removed) and amplified during transmission.

DIP switch (pronounced "dip switch"): A set of tiny toggle switches, built into a DIP (dual in-line package), used for setting

configurable parameters on a PCB (printed circuit board).

DPSK (Differential Phase Shift Keying): A common form of phase modulation used in modems. It does not require complex

demodulation circuitry and is not susceptible to random phase changes in the transmitted waveform, thus reducing errors during

transmission.

DSR (Data Set Ready): An RS232 signal sent from the modem to the computer or terminal indicating that it is able to accept data.

Contrast with DTR.

DTE (Data Terminating Equipment): A term used to include any device in a network which generates, stores or displays user

information. DTE is a telecommunications term which usually refers to PCs, terminals, printers, etc.

DTMF (Dual-Tone MultiFrequency): A generic push-button concept made popular by AT&T TouchTone.

DTR (Data Terminal Ready): An RS232 signal sent from the computer or terminal to the modem indicating that it is able to accept

data.

EBCDIC (Extended Binary Coded Decimal Interexchange Code) (pronounced "eb suh dick"): An IBM character code used in its

mainframe and midrange computers. It is an 8-bit code (256 combinations) that stores one alphanumeric character or two decimal digits

within a byte. This code and ASCII are the most commonly used to represent data.

Echo: The reflection or duplication of a signal back toward its source. Echoing is useful when a terminal is transmitting data, in that the

data can be echoed to the screen so the user can monitor what is being sent. Echoing is undesirable when it refers to the signal which

results on a telephone line from impedance mismatches.

Echo cancellation: A high speed modem technique that isolates and filters out unwanted signals caused by echoes from the main

transmitted signal. This allows full-duplex modems to send and receive on the same frequency carrier.

EIA (Electronics Industries Association): A membership organization founded in 1924 that includes manufacturers of electronic parts

and systems. With over 1200 members, it sponsors shows and seminars and gives awards for outstanding contributions in electronics.

It sets electronic interface standards, such as RS-232.

Environment: A computer configuration that includes the CPU model and system software (operating system, data communications

and database systems). It may also include the programming language used. It sets the standards for the applications that run in it.

EPROM (Erasable Programmable Read Only Memory) (pronounced "eeprom"): A reusable PROM chip that holds its contents until

erased under ultraviolet light.

Error correction: The process of detecting distorted data bits and requesting a retransmission or interpretation to correct the error.

Errors are introduced by bad line conditions or external interface.

Fax (facsimile): Refers to the bit-mapped rendition of a graphics-oriented document (fax) or to the electronic transmission of the image

over telephone lines (faxing). Fax transmission differs from data transmission in that the former is a bit-mapped approximation of a

graphical document and, therefore, cannot be accurately interpreted according to any character code.

Firmware: A category of memory chips that hold their content without electrical power, they include ROM, PROM, EPROM and

EEPROM technologies. Firmware becomes "hard software" when holding program code.

Flash Memory: A memory chip that holds its content without power, but must be erased in bulk. The term comes from its ability to be

erased "in a flash". Flash memory is derived from EEPROM, but are less expensive and provide higher bit densities.

Flow control: The process of regulating the speed at which data enters or leaves a serial port. Software flow control is implemented by

communications software or by the user sending predefined characters or packets which are recognized as "pause" and "resume"

indicators. Hardware flow control is achieved by using the RTS (request to send) and the CTS (clear to send) control lines of the RS232

interface.

Footprint: The desk or floor surface that a piece of hardware occupies. Also referred to as "real estate".

Foreground: The application program currently running on and in control of the PC screen and keyboard. The area of the screen that

occupies the active window. Compare with background.

Format:

1. The way text is set up on a page.

2. To prepare a disk for holding information. Formatting a disk can delete all information that was previously on it.

3. The way information is structured in a file, often specific to one application or protocol.

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Frequency: A characteristic of an electrical or electronic signal which describes the periodic recurrence of cycles. Frequency is

inversely proportional to the wavelength or pulse width of the signal (i.e., long wavelength signals have low frequencies and short

wavelength signals yield high frequencies).

Full-duplex: A method of transmitting and receiving data simultaneously over a single pair of wires. Compare with Half-Duplex.

Half-Duplex: The transmission of data in both directions, but only one direction at a time. Compare with Full-Duplex.

Handshaking: A process that two modems go through at the time of call setup to establish synchronization over the data communica-

tions link. It is a synchronization and negotiation process accomplished by the exchange of predefined, mutually recognized control

codes.

Hard Disk: A metal disk covered with magnetic recording material. Some can hold up to several hundred megabytes of information.

Contrast with floppy disk.

Hardware: The equipment that makes up your computer system, including the keyboard, mouse, disk drives and monitor.

Hexadecimal: A base 16 numbering system used to represent binary values. Hex uses the numbers 0-9 and the letters A-F: usually

notated by an "h" (e.g., "4CF h", read "four charley fox, hex"). The result is that one hex digit represents a 4-bit value.

Host: The computer that is designated as retaining information or processing power to service the needs of other computers or

terminals. Mainframes and mid-range computers are hosts; however, with today's powerful microprocessors, PCs can also be config-

ured to serve as hosts. Often, a PC on a LAN will be set up as a host to provide LAN access for remote users.

Initialize: To start anew and establish start-up parameters, typically involves clearing all or some part of the device's memory or disk

space.

Interface: A common meeting ground supplied by hardware or software to facilitate a compatible connection and operation between

two devices or programs. For example, when two PCs are connected, they use a common interface across the physical connectors, so

that the signals being sent and received are accurately interpreted. With software, an interface is a module created to be "written to".

That is, if two programs are written to the same interface, then they can be successfully linked together.

IRQ Level (Interrupt Request Level): The notification a processor receives when another portion of the computer's hardware requires

its attention. IRQs are numbered so that the device issuing the IRQ can be identified, and so IRQs can be prioritized.

Kilobit: One thousand bits. A unit of measure for digital data rates.

Kilobyte: One thousand bytes. A unit of measure for digital data rates. Not to be confused with "K", which stands for z¹⁰bytes of

storage space, either in memory or on disk. 1K of disk space is actually 1024 bytes, 16K is 65,536 bytes and 1M (meg) is 1,048,576

bytes.

Leased Line: A private, dedicated communications channel that connects two locations. This connection lasts for the duration of the

subscription. Leased lines may be conditioned to improve line quality over that of dial-up lines.

Line Conditioning: An additional cost option offered by the telephone company for their leased, voice-grade lines. The service

provides a careful balance of line enhancements to improve the frequency response and to reduce distortion.

LRC (Longitudinal Redundancy Check): Error checking method that generates a parity bit from a specified string of bits on a

longitudinal track. In a row and column format such as on magnetic tape, LRC is often used with VRC, which creates a parity bit for

each character.

Mainframe: A large, powerful computer used to centralize a data processing environment. It has hundreds of gigabytes of disk storage

space. It uses a front end processor to connect directly to the communications channels that interconnect terminals and computers.

Megabyte: One million bytes when describing a data rate. 1M of disk space may actually mean 1,048,576 bytes.

Mid-range computer: A term coined by IBM referring to any of their Advanced Business Systems computers. This product line was

originally called their mini-computers, but as the number of supported users approached mainframe capabilities, the term "mid-range"

caught on.

Mnemonics: A term assigned to a complex idea, value, or list of information which is found to be representative of that information.

Computer commands are almost entirely mnemonics. Mnemonics are used as memory aids for people.

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Modem: A communications device that enables a computer to transmit information over a telephone line. It converts the computer's

digital signals into analog signals to send over a telephone line and converts them back to digital signals at the receiving end. Modems

can be internal and fit into an expansion slot, or external and connect to a serial port.

Modulation: The process of encoding information from one signal (called the source) into another (called the carrier) by modifying

some characteristic(s) of the carrier. It is often used in telecommunications when one type of signal must be converted for transmission

over an otherwise incompatible medium.

Multiplexer (mux): A device that merges several signals into one composite signal for transmission over a single medium or channel.

A de-multiplexer (usually built into a mux) reverses the process at the receiving end.

NAK (Negative Acknowledgment): Communications code used to indicate that a message was not properly received, or that a

terminal does not wish to transmit. Contrast with ACK.

Network: A group of computers connected by cables or other means and using software that enables them to share equipment, such

as printers and disk drives to exchange information.

Node: Any point within a network which has been assigned an address.

Normal mode: In modem operation, refers to a mode of operation without error correction active.

Off-hook: The condition of a device which has accessed a phone line (with or without using the line). In modem use, this is equivalent

to a telephone handset being picked up. Dialing and transmission are allowed, but incoming calls are not answered.

On-Hook: The condition of a device which has not accessed a phone line. In modem use, this is equivalent to a telephone handset that

has not been picked up. In other words, it can receive an incoming call.

Parameter:

1. A "place holder" in a command which should be substituted with useful information.

2. The list of acceptable values for a given option or command. In UNIX, the generic command should be typed in as Stty/s 9600.

Where "Stty" is the command, "s" is the speed switch, and "9600" where s=1200-115,200 bps.

Parity bit: An extra bit attached to each byte of synchronous data used to detect errors in transmission.

PCB (Printed Circuit Board): A flat board that holds chips and other electronic components. The board is "printed" with electrically

conductive pathways between components. The main PCB in a system is called a motherboard and the smaller PCBs that plug into the

slots in the motherboard are called daughter boards or cards.

PCMCIA (personal computer memory card international association): An organization of U.S. and Japanese companies set up to

standardize memory cards and other architecture-independent expansion devices. These cards are typically used in laptop computers.

Phase: The timing of a signal based upon the starting point of each cycle in another signal. To be detected phase requires the

comparing of two signals. If the cycle of two signals begin at the same point, they are said to be "in-phase". In-phase signals add, while

out-of-phase signals tend to cancel each other.

Port: A location for input or output data exchange. Computers, muxes, etc. have ports for various purposes.

Program: A collection of computer instructions that tell the computer what to do.

PROM (Programmable Read Only Memory): (pronounced "prom") A permanent memory chip that can be programmed or filled by

the customer after by the manufacturer has set initial values. Contrast with ROM.

Prompt: A request for information from the PC that provides required input or information.

Protocol: A set of rules that defines how computing devices communicate with each other. The rules governing the transmitting and

receiving of data.

PSTN (Public Switched Telephone Network): A worldwide public voice telephone network that is used as a telecommunications

medium for the transmission of voice, data and other information.

Pulse dialing: One of two methods of dialing a telephone, usually associated with rotary-dial phones. Compare with tone dialing.

Pulse-width: This pertains to a digital signal. Pulse width refers to the duration of one state between clocking signals. Pulse width

roughly corresponds to an analog signal's wavelength.

Queue: A set of activities that are waiting in chronological order for an action, such as printing, to be performed.

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Rack: A frame or cabinet into which components are mounted. The industry standard rack is 19" wide and has variable depth and

height.

Rackmount: A packaging style available for many types of electronic equipment which enables the installer to mount the equipment in

an industry standardized enclosure. The rackmount equipment is fitted with brackets, rather than being packaged in its own enclosure.

Rackmounting conserves disk or floor space (real estate) and often conserves power outlets.

RAM (Random Access Memory) (pronounced "ram"): A computer's primary workspace. All data must be stored in RAM (even for a

short while), before software can use the processor to manipulate the data. Before a PC can do anything useful it must move programs

from disk to RAM. When you turn it off, all information in RAM is lost.

RJ-11: An industry standard interface used for connecting a telephone to a modular wall outlet; comes in 4-and 6-wire packages.

RJ-45: An 8-wire modular connector for voice and data circuits.

ROM (Read Only Memory) (pronounced "rom"): A memory chip that permanently stores instructions and data. Its contents are

created at the time it is manufactured and cannot be altered. ROM is used to store control routines in PCs and peripheral controllers.

ROM is also used in the plug-in cartridges for printers and video games. A set of ROM chips contain the basic input/output system

(BIOS).

RS232-C: An EIA standard for a serial interface between computers and peripheral devices (modem, mouse, etc.). It uses a 25-pin DB-

25, or a 9-pin DB-9 connector. The RS-232 standard defines the purposes, electrical characteristics and timing of the signals for each of

the 25 lines.

RTS (Request To Send signal): With communications between modems, an RS232 signal sent from the DTE to the modem request-

ing permission to transmit. Contrast with CTS.

Serial Port: The connector on a PC used to attach serial devices (those that need to receive data one bit after another), such as a

mouse, a printer or a modem. This consists of a 9- or 25-pin connector that sends data in sequence (bit by bit). Serial ports are referred

to as "COMx" ports, where x is 1 to 4 (i.e., COM1 through COM4). A serial port contains a conversion chip called a "UART" which

translates between internal parallel and external serial formats.

Switched Line: In communications, a physical channel established by dynamically connecting one or more discreet segments. This

connection lasts for the duration of the call after which each segment may be used as part of a different channel. Contrast with leased

line.

Switched Network: A network in which a temporary connection is established from one point via one or more segments.

Synchronous Transmission: The transmission of data which involves sending a group of characters in a packet. This is a common

method of transmission between computers on a network or between modems. One or more synchronous characters are transmitted to

confirm clocking before each packet of data is transmitted. Compare to Asynchronous Transmission.

T1 Transmission: A standard transmission speed of 1.544M bps that may be used in its full bandwidth, or as narrower channels called

"fractional T1" carriers.

Terminal: The screen and keyboard device used in a centralized computing environment for interactive data entry. Terminals have no

"box", which is to say they have no file storage or processing capabilities.

Terminal emulation: This allows a PC to access a mainframe computer by generating and accepting data like a "dumb" terminal.

Threshold: A value or condition which, when reached, triggers an event.

Toggle: To alternate back and forth between two states.

Tone dialing: One of two methods of dialing a telephone, usually associated with Touch-Tone® (push button) phones. Compare with

pulse dialing.

Transistor: A semiconductor device used to amplify a signal, or open and close a circuit. In digital computers, it functions as an

electronic switch.

Twisted pair wiring: A type of cabling with one or more pairs of insulated wires wrapped around each other. An inexpensive wiring

method used for LAN and telephone applications, also called UTP wiring.

UART (Universal Asynchronous Receiver/Transmitter) (pronounced "you art"): A chip that transmits and receives data on the

serial port. It converts bytes into serial bits for transmission, and vice versa, and generates and strips the start and stop bits appended

to each character.

UTP (unshielded twisted pair): Telephone-type wiring.

V.21: The CCITT modulation standard for 300 bps, full-duplex transmission over dial-up lines.

V.22: The CCITT modulation standard for 1200 bps, full-duplex transmission over a dial-up or 2-wire leased line. This is not common in

North America.

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V.22bis: The CCITT modulation standard for 2400 bps, full-duplex transmission over a dial-up or 2-wire leased line.

V.23: The CCITT modulation standard for 75/1200 bps, half-duplex transmission over dial-up lines. This is not common in North

America.

V.24: The CCITT hardware interface specification for interchange circuits between the DTE and DCE.

V.35: The CCITT hardware interface specification commonly used by DSU/CSUs and other high-speed devices.

WATS (Wide Area Telephone Service) (pronounced "watts"): A discounted long-distance calling plan that allows calls in or out. The

popular 800 numbers are WATS lines in. The calls are charged to the holder of the 800 number at a discounted rate.

Workstation: Traditionally a workstation has been a dumb terminal connected to a host. With the advent of LANs and WANs, PCs that

are connected to a LAN are now called workstations also, even though they are capable of independent processing. A workstation,

then, is simply an input/display device through which a user accesses a resource.

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Index

Symbols

&W Command ....................................... 5-5

2400 BPS MODEM DIAL-UP LINE Connector 3-5, 4-5

25-pin Female D Connectors ............... 1-17

4-Position DIP Switch .......................... 3-10

8-Position DIP Switch SW1 .................... 6-4

Additional Composite Link Commands 5-17

Aggregate .............................................. 1-3

Aggregate Board ................................... 4-2

Aggregate Board Switch SW-5 ............ 3-10

Analog Loop ........................................ 1-13

ASCII Character Code/Hex/Decimal Conversion Chart A-1

Asynchronous Communications............. 1-5

Asynchronous Data Communication Channels

Asynchronous Input Channels ............... 1-1

Asynchronous Line ................................ 1-3

Asynchronous Terminals ....................... 1-4

AT Commands............................... 1-2, 1-9

Auto-Reporting .................................... 1-13

Automatic Fax...................................... 1-18

1-3

Back Pane ............................................ l1-2

Bulletin Board Service (BBS) ................. 8-3

Bxxxxx Command .................................. 5-9

Cabling Diagrams .................................. D-1

Carrier Detect (CD) indicator ........... 3-2, 3-3

CCITT V.24 ......................................... 1-17

CHANNEL 1 .......................................... 1-8

CHANNEL 8 .......................................... 1-8

Channel Board ...................................... 4-4

Channel Board Four-Position DIP Switch

............................................................ 3-10

Channel Devices ................................... 1-5

Channel Device Testing ....................... 7-11

Channel Device Testing Procedure ..... 7-11

Channel Flexibility................................ 1-11

Channel Off Command .......................... 5-9

Channel Select Command (C1-C32) ..... 5-9

Channel Status Command (#S1-#S32)

............................................................ 5-15

Channel Switching ............................... 1-12

Channel Transmit (XMT)........................ 3-2

Clear Composite Statistics command (#C)

............................................................ 5-17

Clear To Send (CTS) Indicator............... 3-2

Command Functions............................ 1-17

Command Modem .............. 1-2, 1-12, 1-19

Command Modem Commands .... 5-27, D-1

Command Modem Operating Procedures

.............................................................. 6-7

Command Modem S-Register Functions

.............................................................. E-1

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Command Modem Select Command #MA1

COMMAND PORT ......................... 1-8, 1-9

Command Port ............................ 1-1, 1-12

Command Port Cables .......................... C-2

COMMAND PORT Connector ............... 4-5

COMMAND PORT TERMINAL/PC Connector 3-6

Command Summary .............................. 5-2

Communications Link ............................ 1-4

Composite Link ............. 1-2, 1-4, 1-5, 1-18

Composite Link (RS232C Interface)....... 4-1

Composite Link (V.35 Interface) ............. 4-2

5-27

COMPOSITE LINK A EXTERNAL MODEM/DSU Connector

COMPOSITE LINK A INTERNAL DSU Connector 3-6

COMPOSITE LINK A or B (RS232C/V.35) EXTERNAL MODE 4-1

COMPOSITE LINK A or B INTERNAL Connector 4-1

COMPOSITE LINK B EXTERNAL MODEM/DSU Connector

2-4, 3-6

3-6

COMPOSITE LINK B INTERNAL DSU Connector

Composite Link Cable............................ 4-1

Composite Link Speeds ......................... 1-4

Composite Link Status Report (#S) ...... 5-19

Composite Link Statistics ....................... 7-1

CompuServe ......................................... 8-4

Configuration 1 ...................................... 2-2

Configuration 2 ...................................... 2-4

Configuration 3 ...................................... 2-5

Configuration 4 ...................................... 2-8

Configuration 5 .................................... 2-11

Configuration 6 .................................... 2-13

Configuration 7 .................................... 2-15

Control Ribbon Cable ............................ 4-2

3-6

Data and Address Ribbon Cable............ 4-2

Data Communications ........................... 1-3

Data Format ...............................1-17, 1-18

Data Troubleshooting Guide .................. 7-4

DB25 Female Connector ....................... 3-6

DDS....................................................... 1-8

Dedicated Network ................................ 1-8

Destination Channel Number Command (DC) 5-9

Destination Node Number Command (DN)

.............................................................. 5-9

Diagnostics .......................................... 1-13

Digital Data Service (DDS)..................... 2-2

Digital Service Units (DSU) .................... 1-1

DIP Switch ............................................. 1-9

DIP Switch SW-5 ................................. 3-10

DOC .................................................... 1-16

Downline Parameter Loading............... 1-12

DSU....................................................... 1-1

DSU and Communications Line Testing

............................................................ 7-12

DSU and Communications Line Testing Procedure

DSU Clock Command ($DSUCL) ........ 5-16

DSU Speed Command ($DSUSP) ....... 5-16

Dual Composite Links .......................... 1-10

Dynamic Buffering ............................... 1-13

Dynamic Load Balance ........................ 1-11

7-12

E&M .............................................. 1-6, 1-8

E&M (I-V) Voice/Fax Channel Cable

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...................................................... 4-1, C-5

E&M to E&M .......................................... 2-1

E&M Wink.............................................. 2-1

Ear and Mouth ....................................... 1-6

Ear and Mouth (E&M) Indicator.............. 3-3

Echo Command (E0-E1) ...................... 5-10

ENQ/ACK ............................................ 1-17

Enquire/Acknowledge Flow Control (F3-F4) Command 5-10

Error Correction ................................... 1-18

EXTERNAL COMPOSITE LINK

RS232C/V.35 Connector ....................... 1-9

Factory Default Command ................... 5-14

FAX Indicator ......................................... 3-4

Fax Transmissions................................. 1-4

FCC Regulations ................................. 1-15

Firmware Version .................................. 8-2

Flow Control ....................... 1-4, 1-11, 1-17

Flow Control (FC) Indicator .................... 3-2

Flow Control Background....................... F-1

Flow Control Command (F0-F2) .......... 5-10

Flow Control Received (FCR) Indicator

...................................................... 3-2, 3-3

Flush Timer Value (#FT) ...................... 5-17

Foreign Exchange Office ....................... 1-6

Foreign Exchange Office (FXO) Indicator

.............................................................. 3-3

Foreign Exchange Station...................... 1-6

Foreign Exchange Station (FXS) Indicator

.............................................................. 3-3

Four-Position DIP Switch ..................... 3-10

Frequency ........................................... 1-19

Front Panel ............................................ 3-1

Front Panel LED Status Command (#SL)

............................................................ 5-19

FXO ............................................... 1-6, 1-8

FXS ............................................... 1-6, 1-8

FXS Ground Start .................................. 2-1

FXS Loop Start ...................................... 2-1

FXS to FXO ........................................... 2-1

FXS to FXS ........................................... 2-1

General Help ......................................... 5-6

Group 3 Fax Rates .............................. 1-18

HDLC .................................................... 1-3

Help Commands .................................... 5-5

High Level Data Link Control ................. 1-3

Identification Command (I0-I2) ............. 5-12

Interface .............................................. 1-18

Internal DSU ........................................ 1-18

Inverted DTR Command (F11-F12) ..... 5-11

LADS ................................................... 1-18

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LED Indicators ....................................... 3-2

Limited Warranty ........................... 1-2, 8-1

Line Interface ....................................... 1-18

Link Protocol ................................ 1-3, 1-18

Link Speed .......................................... 1-18

Link Voice/Fax Communicates Over

Command (V(1/2)ML) .......................... 5-21

List Channel Parameters Command

(L0-L32) ............................................... 5-12

List Composite Link Configuration Command ($L)

List Composite Link Settings Command

(#L) ...................................................... 5-18

List The Voice/Fax Channel Parameters command (VL)

Load DSU Factory Defaults Command

5-17

5-20

($F)...................................................... 5-17

Load Number....................................... 1-16

Local Access ....................................... 1-17

Local Area Data Set............................. 1-18

Local Loop Test (&T4) ......................... 5-25

Local Voice Channel 1 (V1) ................. 5-21

Main Frame Computer ........................... 1-4

Memory Test 2 (&T2) ........................... 5-25

Memory Tests (&T1-T3) ....................... 5-25

MLA/B/D .............................................. 5-12

MLD Command ................................... 1-11

Model No. ..................................... 1-15, 8-2

Modem Link Command (MLA/B/D) ...... 5-12

Multi-Tech BBS...................................... 8-3

MultiMux ................................................ 1-1

MultiMux Functional Testing ................ 7-13

MultiMux Functional Testing Procedure

............................................................ 7-13

MultiMux Operating Procedures ............. 6-1

Multiplexing ........................................... 1-1

Multipoint ............................................... 1-5

Mux Clock Command ($MUXCL) ......... 5-16

Mux Speed Command ($MUXSP) ....... 5-16

MV2 Voice/Fax board .................. 2-8, 2-15

Networking .......................................... 1-10

Non-Volatile Memory test..................... 5-26

Number of Channels ............................ 1-18

Number of Channels Switch ................ 3-10

Number of Links .................................. 1-18

Off-Hook Indicator.................................. 3-3

ON/OFF Switch ..................................... 3-5

Operating Procedures............................ 6-1

Operational Statistics ........................... 1-13

OPX....................................................... 3-8

OPX (Off Premises Extension) ............... 3-7

Pacing ......................................... 1-4, 1-17

Pacing Control Command (F5-F6) ....... 5-10

Parameter Memory .............................. 1-12

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Parity ................................................... 1-17

Parity Select Command (P0-P2) .......... 5-13

Parts of your Mux Network ..................... 7-3

Pass EIA Signal Commands (F7-F8) ... 5-11

Pass Xon/Xoff Command (F9-F10) ...... 5-11

PBX ............................................... 1-6, 1-8

PBX E&M Trunk .................................. 2-11

PC ......................................................... 1-4

PC Board Power Cable.......................... 4-2

PDN............................................... 1-8, 1-9

Point-to-Point ......................................... 1-5

Point-to-Point Network ......................... 1-11

Power Connector ................................... 3-5

Power Consumption ............................ 1-19

Priority Control ..................................... 1-14

Priority Statistical Multiplexer ................. 1-1

Priority Statistical Multiplexing ................ 1-4

Programmable Retransmit Timer (#RXT) Command

PSM ...................................................... 1-1

PSTN................................................... 1-10

Public Data Network .............................. 1-8

Public Switched Telephone Network .... 1-10

5-18

Quarter-Turn-Fasteners ......................... 4-4

"Quick brown fox" Message Test (&T11)

............................................................ 5-26

Receive (RCV) Indicator ................ 3-2, 3-4

Recording MultiMux Information ............ 8-2

Remote Access ................................... 1-17

Remote Command Modem Access Command #RA1 5-27

Remote Down (RD) indicator ................. 3-3

Remote Source Number Group Select (SNGA..H)

REN..................................................... 1-15

Reset Command.................................... 5-5

Reset Voice/Fax Channel Command

5-14

(V(1/2)Z) .............................................. 5-20

Response Time ................................... 1-14

Response Time Control ....................... 1-14

Response Time Priority Command

(R0-R3)................................................ 5-13

Retransmit (RXT) Indicator .................... 3-3

Ringer Equivalence Number ................ 1-15

RJ11 Phone Cable ................................ 4-1

RJ48 Phone Cable ................................ 4-1

RJ48S ................................................. 1-18

RS232 ................................................... 1-5

RS232C Interface Specification ............. B-1

RS232C/V.24 Interface ........................ 3-11

RS232C/V.35 Shunt .................... 3-11, E-9

Select Downline Load Parameters Command (&SR) 5-15

Select Local Parameters Command..... 5-15

Serial No................................................ 8-2

Service .......................................... 1-2, 8-3

Signaling.............................................. 1-18

Small Telephone Switch ........................ 1-6

SNGynnn ............................................. 5-14

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Source Node Command (SN) .............. 5-13

Specifications ...................................... 1-17

Stat Muxes............................................. 1-3

Statistical Multiplexers ........................... 1-3

Status Report Baud Rate (#RB) ........... 5-18

Status Report Time (#RT) .................... 5-18

STDM .................................................... 1-4

Stop Bit Command (SB1-SB2) ............. 5-13

Store New Parameters command .......... 5-5

Store New Parameters Command (&W) 5-1

Switch and LED Operational Test (&T7)

............................................................ 5-26

Switches and Shunts ............................. 3-9

Synchronous Communications .............. 1-1

Synchronous Composite Links............... 1-1

Synchronous Data Packets .................... 1-3

System Control .................................... 1-17

System Features.................................. 1-10

Tech Support ................................. 1-2, 8-2

Telco Facility.......................................... 2-2

Terminals............................................... 1-4

Test Cables ........................................... 7-2

Test Commands (&T1-&T12) ............... 5-25

Test Mode (TM) Indicator ....................... 3-4

Transmit (XMT) Indicator ............... 3-2, 3-4

Troubleshooting ..................................... 7-3

Universal Channel Parameters (C0) ...... 5-9

V.22bis/V.22 ........................................ 1-19

V.24 Position ......................................... 4-3

V.24 Shunt........................................... 3-11

V.24/V.35 Shunt .................................... 4-3

V.35 ....................................................... 1-8

V.35 Interface ...................................... 3-11

V.35 Interface Adapter Cable ................. 4-4

V.35 Position ......................................... 4-3

V1LIFXO Command .............................. 2-8

V1RIFXS Command .............................. 2-8

V2LIFXO Command .............................. 2-8

V2RIFXS Command .............................. 2-8

Voice (VCE) Indicator ............................ 3-4

Voice Channel ..................................... 1-18

Voice Digitization Rates ....................... 1-18

Voice-Grade Phone Line ....................... 1-4

Voice/Fax ............................................ 1-10

Voice/Fax Board .................................... 4-2

VOICE/FAX CHANNEL 1 E&M Connector

.............................................................. 3-7

VOICE/FAX CHANNEL 1 FXO Connector

...................................................... 2-8, 3-8

VOICE/FAX CHANNEL 1 FXS Connector

.............................................................. 3-7

VOICE/FAX CHANNEL 1or 2 E&M Connector 2-15

VOICE/FAX CHANNEL 1or 2 FXS Connector 2-13

VOICE/FAX CHANNEL 2 E&M Connector

.............................................................. 3-7

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VOICE/FAX CHANNEL 2 FXO Connector

.............................................................. 3-7

VOICE/FAX CHANNEL 2 FXS Connector

.............................................................. 3-7

Voice/Fax Channel Parameters ........... 2-10

Voice/Fax Channels....................... 1-1, 1-8

Voice/Fax Channel Testing .................. 7-15

Voice/Fax Channel Testing Procedure.7-15

Voice/Fax Destination Channel Command (V(1/2)DC) 5-21

Voice/Fax Destination Node command

(V(1/2)DN) .......................................... 5-21

Voice/Fax Digitizing Rate Command

(V(1/2)DR) .......................................... 5-21

Voice/Fax Local Interface Command

(V(1/2)LI) ............................................. 5-24

Voice/Fax Loopback Test (&T12) ......... 5-26

Voice/Fax Input Level Gain Command

(V(1/2)IL) ............................................. 5-21

Voice/Fax Operating Procedures ........... 6-5

Voice/Fax Output Level Attent Command (V(1/2)OL) 5-22

Voice/Fax Remote Channel Interface Command (V(1/2)RI)

Voice/Fax Troubleshooting Guide .......... 7-8

Voice/Fax Silence Suppression Command (V(1/2)SS) 5-23

Voltage ................................................ 1-19

5-24

Warranty ................................................ 1-2

Watch-Dog Timer Test ......................... 5-26

Wink Timer Command (V(1/2)WT) ....... 5-25

Word Length Select Command (WL5-8)

............................................................ 5-14

XMT/RCV .............................................. 3-2

Xon/Xoff............................................... 1-17

Xon/Xoff Flow Control Signals ............. 5-11

Xoff/First Character ........................ 5-2,5-12

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