Models MTA128ST and MTA128NT
External ISDN Terminal Adapter
User Guide
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Contents
Chapter 1: Introduction and Description ..................................................................................................................... 4
Welcome to the world of ISDN communications. .............................................................................................................. 4
Product Description .......................................................................................................................................................... 4
Features ........................................................................................................................................................................... 5
LED Indicators .................................................................................................................................................................. 8
Technical Specifications.................................................................................................................................................... 10
Chapter 2: Hardware Installation ................................................................................................................................... 11
Safety Warnings ............................................................................................................................................................... 11
Connecting your TA .......................................................................................................................................................... 11
Chapter 3: Configuration Utilities.................................................................................................................................. 13
Introduction....................................................................................................................................................................... 13
BeforeYou Start ................................................................................................................................................................ 13
Configuring your TA .......................................................................................................................................................... 17
Chapter 4: AT Commands, S-Registers, and Result Codes......................................................................................... 26
MTA128ST/NT Commands and S-Registers .................................................................................................................... 26
S-Registers....................................................................................................................................................................... 29
Chapter 5:Troubleshooting ........................................................................................................................................... 34
Troubleshooting the TA ..................................................................................................................................................... 34
Chapter 6: Point-to-Point Communications: PPP/MLPPP ........................................................................................... 41
Chapter 7:Warranty, Service, andTech Support .......................................................................................................... 44
Multi-Tech Systems, Inc. Warranty & Repairs Policies ...................................................................................................... 44
Online Warranty Registration ............................................................................................................................................ 45
Service ............................................................................................................................................................................. 45
Replacement Parts ........................................................................................................................................................... 46
Technical Support ............................................................................................................................................................. 47
Appendix A:Configuration Profiles ............................................................................................................................... 48
Quick Setup Factory Profiles ............................................................................................................................................ 48
Quick Setup Example ....................................................................................................................................................... 48
Appendix B: OrderingYour ISDN Line .......................................................................................................................... 49
Loop Qualification ............................................................................................................................................................. 49
Bearer Service.................................................................................................................................................................. 50
Using ISDN Ordering Codes (IOCs) ................................................................................................................................. 50
Ordering ISDN Without IOCs ............................................................................................................................................ 52
Appendix C: FCC and Canadian Regulation ................................................................................................................ 56
FCC .................................................................................................................................................................................. 56
Canadian Limitations Notice ............................................................................................................................................. 57
Appendix D: Configuration Methods ............................................................................................................................ 58
Firmware-based Configuration Utility ................................................................................................................................ 58
Configuration via AT Commands ...................................................................................................................................... 58
Glossary .......................................................................................................................................................................... 59
Index ................................................................................................................................................................................ 65
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Introduction and Description
Chapter 1: Introduction and Description
Welcome to the world of ISDN communications.
You have acquired one of the finest ISDN terminal adapters (TAs) available today, model MTA128ST/NT
from Multi-Tech Systems.The MTA128ST is a desktop TA with an S/T interface port to connect it to the
ISDN network and an analog port to connect it to a telephone, modem, or fax machine. The MTA128NT is
a desktop TA with a U-interface to connect it to the ISDN network and an analog port to connect it to a
telephone, modem, or fax machine.The TAs ship with a software configuration utility for Windows® 98/NT/
ME, and ConfigMenu, a built-in configuration utility for Windows and non-Windows operating systems. In
addition, the MTA128ST/NT accepts AT commands that enable it to use the same communications
software as an analog modem.
The MTA128ST is compatible with the popular EuroISDN switch protocol, it communicates using ISDN BRI
(2B+D) service, which provides up to 128 Kbps data and voice communications, and it automatically
detects whether an incoming call is voice or data and handles it appropriately.
The MTA128ST/NT provides dial-up asynchronous communication capability with other personal
computers, terminals, on-line computer services, or other computer systems. Connection to your
computer/terminal device is made via the RS232 connector (ISDN). Connection to analog devices is
accomplished with an RJ11 connector and one RJ45 connector is used for your ISDN connection.
This User Guide will help you install, configure, and operate your MTA128ST/NT.
Product Description
There are two ISDN interface options, S/T and U. If you purchased the S/T interface adapter
(MTA128ST), you need an ISDN NT1 device connection to the ISDN switch. If you purchased the U
interface adapter (MTA128NT), it can directly connect to the ISDN switch (figure 1-1).
ISDN
MTA128ST
T interface
NT1
ISDN U interface
customer site
ISDN U interface
ISDN
central office
MTA128NT
customer site
Figure 1-1. ”S/T” and “U” Interface Options
Your ISDN TA is compatible with prevalent ISDN switch protocols. It communicates using ISDN BRI
(2B+D) service, which provides up to 128K bps data communications.
MTA128ST/NT
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Introduction and Description
This manual documents the following models:
• MTA128ST for S/T interface with one POTS port
• MTA128NT for U interface with one POTS port
Some analog devices, including telephone set, answering machine, and modem, can be connected to the
POTS port via an RJ-11 jack.
This User Guide will help you install, configure, and operate your terminal adapter.
Features
The MTA128ST/NT communicates over public ISDN telephone lines. Features include:
Compatibility with EuroISDN (ETSI/DSS1/NET3), French VN4, and Japanese INS64 switch protocols
Compatibility with U.S. NI-1, AT&T 5ESS, and DMS-100 switch protocols
Compatibility with V.110 (some models only), V.120, ML-PPP, and X.75 protocols
Transparent synchronous communication capability (CLEAR)
ISDN BRI (2B+D) and analog ports
•
•
•
•
•
•
•
•
•
RS232E serial port
Serial port speeds to 460.8 Kbps
Support of PPP (Point-to-Point Protocol) for high speed ISDN connections
Tone detection to allow use of a standard telephone for ISDN line access (an ISDN telephone is not
required)
•
•
•
•
•
Automatic detection of incoming calls as voice or data
Windows 98/NT/ME software utility and a firmware utility for easy ISDN line configuration
AT commands, S-registers, and result codes
Ability to use the same communications software as analog modems
Flash memory for easy firmware upgrades
ISDN BRI Line
Before running the ISDN adapter, you need to get an ISDN BRI (Basic Rate Interface) line from your local
telephone company. Your ISDN service provider will provide information to you about the ISDN central
switch type, pertinent subscriber information and SPID (Service Profile ID) number(s) if required .
SPID (Service Profile ID)
The Service Profile ID (SPID) is applicable in the U.S. only. SPIDs are a series of numbers that inform the
central office switch which services and features to provide to an ISDN device. The generic SPID format
comprises 14 digits. The first 10 digits are the main telephone number on the terminal. The last 4 digits
are dependent on the number of terminals on the interface and the services they support.
NT1 Connection
An ISDN Basic Rate (BRI) U-Loop consists of 2 conductors from the CO (telephone company central
office) to the customer premises.The equipment on both sides of the U-loop has been designed to deal
with the long length of the U-loop and the noisy environment it operates in. At the customer premises the
U-loop is terminated by an NT1 (network termination 1) device. An NT1 is a device which provides an
interface between the two-wire twisted-pairs used by telephone companies in their ISDN BRI network and
an end-user's four wire terminal equipment. The NT1 drives an S/T-bus which is usually made up of 4
wires, but in some cases may be 6 or 8 wires.
The name of the S/T bus comes from the letters used in the ISDN specifications to refer to two reference
points, S and T. Point T refers to the connection between the NT1 device and customer supplied
equipment. Terminals can connect directly to NT1 at point T, or there may be a PBX (private branch
exchange, i.e. a customer-owned telephone exchange). When a PBX is present, point S refers to the
connection between the PBX and the terminal. Note that in ISDN terminology, "terminal" can mean any
sort of end-user ISDN devices, such as data terminals, telephones, FAX machines, etc. The diagram
which follows reflects interface points in a typical ISDN network.
MTA128ST/NT
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Introduction and Description
If your ISDN product operates with a S/T outlet interface, you need an NT1 device to connect to the ISDN
switch. MTA128ST adapters need an NT1 device to connect to the ISDN switch, but the MTA128NT
adapter does not require NT1 device. In the UK, and in many European countries, NT1 device is supplied
by your telephone company.
Point “S”
4-8 Wires
Point “T”
Terminal
NT2
(PBX)
4-8 Wires
Point “U”
2 Wires
NT1
Point “S”
Point “S”
Terminal
Terminal
Figure 2-1 ISDN Interface Points
S/T Interface
The S/T interface uses an 8-conductor modular cable terminated with an 8-pin RJ-45 plug. An 8-pin RJ-45
jack located on the terminal is used to connect the terminal to the DSL (Digital Subscriber Loops) using
this modular cable.
Table 2-1 shows the Pin Number, Terminal Pin Signal Name and SILC Pin Signal name for the S/T
interface.
Pin
TE Signal
Not used
Not used
Tx+
1
2
3
4
Rx-
5
Rx+
6
Tx-
7
Not used
Not used
8
MTA128ST/NT
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Introduction and Description
U Interface
The U interface uses a 2-conductor twisted pair cable terminated with an RJ-45 jack. An RJ-45 jack
located on the terminal is used to connect the terminal to the Digital Subscriber Loops using this twisted
pair cable.
In Table 2-2 the Pin Number, Terminal Pin Signal Name and UILC Pin Signal Names for the U interface are
listed.
Pin
1
2
3
4
5
6
7
8
NA
NA
NA
Positive Input
Negative Input
NA
NA
NA
MTA128ST/NT
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Introduction and Description
LED Indicators
The ten LED indicators on the front panel (see figure below) of the MTA128ST/NT report status and line
activity.
TD
Transmit Data
Flashes when data is being transmitted (on for a space, off for a mark).
RD
Receive Data
Flashes when data is being received (on for a space, off for a mark).
LS
Link Status
For EuroISDN NET3, INS64, and VN4 switch protocols, lights when the TA is turned on. For US NI-1, DMS-100,
and AT&T 5ESS switch protocols: On Steady, Link with central office is established (requires correct configuration
of SPIDs) Flashing, Physical layer is down or one or both SPIDs have not been verified with central office
B1
Bearer Channel 1
When lit, indicates active data or voice connection on bearer channel 1.
B2
Bearer Channel 2
When lit, indicates active data or voice connection on bearer channel 2.
TR Terminal Ready
Lights to indicate that the computer is communicating with the MTA128ST/NT, so the MTA128ST/NT can answer
an incoming call.
OH
Off Hook
Lights when analog equipment on AUX port is active or off-hook.
128
128 Kbps
Lights to indicate that the B channels have been multiplexed into a single 128 Kbps communications link.
P1
Data Protocol
Lights in combination with P2 and 128 LEDs to indicate which data protocol (V.110, V.120, X.75, PPP, MLPPP) is in
use as shown in the table below.
P2 Data Protocol
Lights in combination with P1 and 128 LEDs to indicate which data protocol (V.110, V.120, X.75, PPP, MLPPP) is in
use as shown in the table below.
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Introduction and Description
Data Protocol
V.110
128 LED P1 LED P2 LED
V.120
X.75 (1 channel)
PPP (1 channel)
MLPPP (2 channels)
OFF
ON
MTA128ST/NT
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Introduction and Description
Technical Specifications
Trade Name
IWay Hopper™
Model Number
MTA128ST (International),
MTA128NT
Network Interface
ST-Four-wire S/T interface
NT– 2-wire “U” interface
Switch CompatibilityEuroISDN (ETSI/DSS1/NET3), VN4, INS64, U.S. NI-1, AT&T 5ESS,
DMS-100 (both models support all of the switch protocols)
B-Channel ProtocolsV.110 (some models only),V.120, X.75, PPP, ML-PPP, CLEAR
Voice Coding
PCM: A-Law ; µ-Law (switch protocol dependent)
LED Indicators
10 front panel LED indicators:Transmit Data, Receive Data, Link Status, B1 Active,
B2 Active, Terminal Ready, Off Hook (AUX port), 128 Kbps, P1 Active (data
protocol), P2 Active (data protocol)
Data Rates
300, 1.2K, 2.4K, 4.8K, 9.6K, 19.2K, 38.4K, 56K, 57.6K, 64K, 115.2K, 230.4K, and
460.8K bps
Async Data Format 7 bit data + odd/even parity + 1 start/stop, 8 bit no parity. 36 baud rate/parity settings
via S-register. Baud rates of 300–460.8K bps with even, space, mark, odd, or no
parity.
Data Connections Two ISDN B-channels
One ISDN D-channel
One analog port for connecting a standard telephone, modem, or fax machine
Command Interface AT commands, S-registers, result codes, ConfigMenu firmware configuration utility,
Windows 98/NT/ME configuration utility, Dial-Up Networking (DUN)
Connectors
ISDN: RJ-45 female receptacle, 4-wire S/T (accepts connection cable to the network
provider’s NT1 device) or 2-wire U interface
AUX: RJ-11 female receptacle, 2-wire voice service
Serial Port: female DB-25 RS232E/V.24
Serial Interfaces
Switches
ITU-T V.24, EIA/TIA RS232E
Two-position power switch
Power RequirementsTwo-prong outlet-mounted transformer (included), 240 VAC 50/60 Hz
Dimensions
15.0 cm × 10.7 cm × 2.8 cm (L × W × D)
Environmental
Temperature range 0°–40° C (32°–104°F)
Humidity range 20–90% (noncondensing)
Power Consumption 4 watts
Weight
224 g (8 oz)
Warranty
5 years
MTA128ST/NT
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Hardware Installation
Chapter 2: Hardware Installation
This chapter shows you step-by-step how to set up your MTA128ST/NT terminal adapter (TA) to your
computer, power, network terminator, and an auxiliary analog device. Please follow these instructions
carefully to avoid damage to your TA .
Safety Warnings
• Use this product only with UL-listed and CUL-listed computers.
• Never install phone wiring during a lightning storm.
• Never install a phone jack in a wet location unless the jack is specifically designed for wet
locations.
• Never touch uninsulated phone wires or terminals unless the phone line has been
disconnected at the network interface.
• Use caution when installing or modifying phone lines.
• Avoid using a phone (other than a cordless type) during an electrical storm; there is a risk of electrical
shock from lightning.
• Do not use a phone in the vicinity of a gas leak.
• To reduce the risk of fire, use only 26 AWG or larger telephone line cord.
Connecting your TA
Turn off your computer. Place the modem in a convenient location, connect it to your computer’s serial
port, to the phone line, to AC power, and to your phone.
Cable Connections.
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Hardware Installation
Connect the TA to the AC Power Outlet
Plug the DC power transformer into an AC power outlet or power strip. Plug the DC power transformer into
the POWER jack on the TA.
Note: Use only the DC power transformer supplied with the TA. Use of any other transformer voids the
warranty and can damage the TA.
Turn on the TA by sliding the power switch to ON and verify operation by observing the LEDs on the front
panel. The LEDs first flash in a self-test pattern.Then the LS LED remains on. If the TA does not appear to
be working, Refer to Chapter 5 for troubleshooting help.
Connect the TA to Your PC (RS-232 Connection)
Plug one end of the RS-232 serial cable into the RS-232 connector on the modem, and plug the other end
into a serial port connector on your computer, such as COM1 or COM2.You supply the RS-232 cable.
Connecting to your ISDN Network Terminator
If you need a longer cable than the one provided with your TA, select a cable that is wired straight through
(pin 1 to pin 1; pin 2 to pin 2, etc) with at least the middle four pins connected (pins 3, 4, 5, and 6).
Plug one end of the cable into the ISDN jack on the TA and the other end into the jack on your network
terminator (MTA128ST) or U-interface (MTA128NT).
Note: The PHONE jack and ISDN jack are not interchangeable.
(Optional) Connecting to Analog Equipment
You can connect an analog device such as an analog telephone, modem or fax machine to the TA. Simply
put the device’s module telephone cable into the PHONE Jack (RJ11) on the TA.
Note: The PHONE jack and the IDSN jack on the TA are not interchangeable.
MTA128ST/NT
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Configuration Utilities
Chapter 3: Configuration Utilities
Introduction
You can configure the MTA128ST/NT to match your ISDN service and the remote terminal adapter (TA)
with any of four methods listed below:
•
•
•
ISDN TA Configuration Utility
This configuration utility is recommended for computers running Windows 98/NT/ME operating systems.
Because it is a software-based utility, you can use it to create and store as many configurations as you
want.
ConfigMenu
This firmware-based configuration utility is recommended for computers running other OS with terminal
capabilities. To run it, you must have a VT100/ANSI-compatible terminal or a data communication
program that includes VT100/ANSI terminal emulation.
Windows Dial-Up Networking
With Dial-Up Networking you can gain access to shared information on another computer, even if your
computer is not on a network. The computer you are dialing in to must be set up as a network server for
you to use its shared resources. Windows includes a remote-node client called Dial-Up Networking
(DUN). The MTA128ST/NT can be configured to communicate using this utility.
•
AT Commands
If you prefer using AT commands or want to fine tune the operation of your TA, configure your TA by
using AT commands and S-registers much as you would configure an analog modem. You must enter
these commands in your data communication program’s terminal mode. For more information see ST
and NT AT command documents included on this CD.
Before You Start
Whatever method you use to configure your TA, consider your network and call control configuration
choices and COM port settings beforehand listed below and record your choices. Refer to them during the
configuration procedure.Before you begin, verify your switch type and TEI with your local ISDN provider
and have that information readily available
Network Configuration
Network SwitchType __________________________
Select the network switch type your ISDN service provider uses at its local central office.You can set the
MTA128ST/NT to NET3 (DSS1), VN4, INS64, U.S. NI-1, AT&T 5ESS, or DMS-100. If you don’t know the
switch type, get the information from your ISDN service provider.
AT command: !C0=
DataTEI _____________________________________
Data TEI is the TEI assigned to the data channel.You can select Auto TEI, a fixed TEI, or Disable. A TEI
(terminal endpoint identifier) is a number used by the central office switch to uniquely identify each device
connected to the network. When it uses dynamic TEI assignments (Auto TEI), the central office switch
assigns a TEI each time the TA connects to the network. However, the ISDN service provider may assign a
fixed TEI at subscription time, in which case you must configure the TA with the fixed TEI number.You also
can disable the channel, which may be useful when multiple TAs are attached to a network terminator bus.
AT command: !D3=
VoiceTEI ____________________________________
Voice TEI is the TEI assigned to the voice channel. Choices are: Auto TEI, a fixed TEI number, or Disable.
AT command: *!D3=.
Data MSN ___________________________________
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Configuration Utilities
The Data MSN (multiple subscriber number) allows a caller to specify an individual TA when more than
one TA is connected to you network terminator. If you don’t assign a value to the MSN, the TA accepts all
incoming calls. If you only assign a base address to the MSN, the TA accepts any incoming call with the
same base address, regardless of whether a subaddress is included. If you assign a base address and a
subaddress to the MSN, the TA only accepts calls that match both the base address and the subaddress.
The following examples show the syntax for setting the MSN with and without a subaddress.
AT command: !N1=
MSN with subaddress: 5551000:001 (base address is 5551000; subaddress is 001)
MSN without subaddress: (base address is 5551000)
Voice MSN ___________________________________
Selects calls on the voice channel in the same way the Data MSN selects calls on the data channel.
AT command: *!N1=
SPIDs and DNs _______________________________
The TA must be configured with the Service Profile Identifier (SPID). The SPID is assigned by the local
phone company and is for the specific BRI line where the TA is attached. The SPID field is empty prior to
configuration.
AT commands: AT!C6= and AT*!C6=
Directory Number (DN) is the phone number another user calls to contact this TA once it is attached to the
ISDN.
AT commands: AT!N1= and AT*!N1=
Note: SPIDs and DNs are used only by the U.S. NI-1, AT&T 5ESS, and DMS-100 switch types.
Call Control Configuration
Persistent DTR Dialing _________________________
A high DTR (Data Terminal Ready) signal on the RS232/V.24 serial port indicates your computer or
terminal is ready to communicate with your TA. DTR normally goes high when a communication program
starts or is ready to dial. Persistent DTR dialing enables the TA to automatically redial the number stored in
memory location 0 whenever DTR is high and the serial port does not have an active call.You can enable
or disable this feature.
AT command: $D.
Auto Answer Data Calls _____ Rings to Answer ______
Select Auto Answer if you want your TA to automatically answer all incoming data calls (this option does
not affect the analog port).The Rings to Answer number, in the range of 1 to 255, selects the number of
rings the TA waits before answering an incoming call. The default is one ring.
AT command: S0=
Dialing Method _______________________________
Select either the Enbloc or the Overlap dialing method for use when establishing a data call.Your ISDN
provider determines the dialing method.The enbloc method is used for most ISDN dialing; however, you
can select the overlap method if you are working with a private network.
AT command: %A97=
Data Protocol ________________________________
The data protocol, also known as the B-channel protocol and the rate adaption protocol, is the language
spoken over each 64 Kbps channel between two ISDN devices. The devices on both ends of the ISDN link
must use identical protocols.
AT command: !Z=
V.110 Protocol (some models only) — Used to connect slower, pre-ISDN communications devices to
high-speed ISDN lines. It handles rates up to only 38400 bps and is used mostly in Europe. The devices on
both ends of the link must be set to identical rates.
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Configuration Utilities
V.120 Protocol—Similar to V.110 protocol, but provides rates up to 64000 bps on each B channel.
X.75 Protocol—Packet-switched network protocol for international use. Layer 2 portion of this protocol is
used commonly as a rate adaption protocol.
MLPPP Protocol—MLPPP (Multi-Link PPP) protocol provides rates up to 64 Kbps per channel.This
protocol uses both B channels at once, providing an aggregate data transmission speed of 128 Kbps.
Dialing Numbers______________________________
The MTA128ST/NT can dial telephone number n, where n can be up to 20 characters.
AT command: Dn (n = phone number).
Stored Numbers ______________________________
The MTA128ST/NT can store as many as ten phone numbers, up to 20 characters each.
AT command: &Z=
Dialing Stored Numbers _______________________
The MTA128ST/NT can dial a number previously stored in directory number n with the &Zn=x command.
AT command: e.g., DS3
COM Port Settings
COM port settings control how your TA communicates with your computer through the RS232/V.24 serial
port.
Baud Rate or Bit Rate _________________________
Select the initial speed at which your TA communicates with your computer. For V.110 data protocol, the
rates must be identical on the local and remote TAs and may not exceed 38400 bps. For all other data
protocols (V.120, MLPPP, X.75, etc.), the default initial baud rate is 115200 bps.Typically, in command
mode, the MTA128ST/NT selects a serial port speed of 300, 1200, 2400, 4800, 9600, 19200, 38400,
57600, 115200, or 230400 bps depending on how fast the AT commands are coming from the computer or
terminal.The $SBn command sets the default serial speed used when the TA first powers up. Using the
%S command you can disable automatic speed selection and lock the serial port speed to 460800 bps.
See Serial Port Configuration Commands in Chapter 4 for more information.
AT commands: $SB or %S
Note: Your computer must have a high speed serial port with a 16550AFN UART, or equivalent, to utilize
ISDN’s high speeds.
Flow Control _________________________________
Select the method by which your TA and computer control the flow of data between them. Unless you know
your computer has special requirements, select the default RTS/CTS method. The other choice is XON/
XOFF.
AT command: &E
Data Bits, Parity, and Stop Bits __________________
These settings further control initial communications between the TA and computer. Unless you know your
computer has special requirements, use the default settings of 8 data bits, no parity checking, and 1 stop
bit (8-N-1). The TA sets these parameters automatically the first time it receives an AT command from the
computer.
AT commands: @P4=, @P3=, @P6=
DTR DetectTime ______________________________
Sets the time, in 0.1-second increments, that DTR must remain low before the TA disconnects. The default
value is 0.5 second; however, you can set it anywhere within the range 0–255
(0.05–25.5 seconds).
AT command: S25=
DCD Drop Time _______________________________
Sets the time, in 0.1-second increments, that a carrier must be lost before the TA disconnects.The default
value is 0.7 seconds; however, you can set it anywhere in the range 0–254 (0–25.4 seconds). Setting DCD
Drop Time to 255 causes the TA not to disconnect with loss of carrier when DCD Control is set to
Momentary Drop.
AT command: S10=
MTA128ST/NT
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Configuration Utilities
DTR Control _________________________________
A high DTR (Data Terminal Ready) signal on the RS232 serial port indicates your computer or terminal is
ready to communicate with your TA. It normally goes high when a communication program starts or is
ready to dial. Normal causes the TA to break the link and go into command mode when DTR drops. Ignore
causes the TA to ignore the DTR signal. Reset on DTR causes the TA to reset when DTR drops for the
time specified in register S25.
AT command: &D
CTS Control _________________________________
A high CTS (Clear to Send) signal on the RS232 serial port indicates the TA is ready to receive data.
Normally, it follows the state of the RTS signal. Select Normal to make CTS act normally. Select Always On
to force CTS high when the TA is offline. When the TA is online, CTS still provides flow control. Select
Momentary Drop to cause CTS to drop momentarily when the link is lost; then to go high again.
AT command: &R
DSR Control _________________________________
A high DSR (Data Set Ready) signal on the RS232 serial port indicates your TA is ready to communicate
with your computer or terminal. Normally, it follows the state of the DTR signal. Select Normal to make
DSR act normally. Select Always On to cause the TA to ignore the state of the DTR signal. Select
Momentary Drop to cause DSR to drop momentarily when the link is lost; then to go high again.
AT command: &S
DCD Control _________________________________
Normally, the DCD (Data Carrier Detect) signal on the RS232 serial port goes high when the TA receives a
connect message from a remote TA, and drops when the link is lost. Select Always On to satisfy a
requirement by some software packages for this state to be present constantly. Select Normal for normal
operation. Select Momentary Drop to cause DCD to drop momentarily when the link is lost; then to go high
again.The length of the drop is governed by register S10.
AT command: &C
Asynchronous/Synchronous Mode ______________
Normally, the MTA128ST/NT communicates in asynchronous mode. If you need transparent synchronous
communication, change this register setting.
AT command: &M
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Configuration Utilities
Configuring your TA
If you use Windows 98/Me/NT, perform the following procedure using the Configuration Utility provided on
your system CD. If you are using another operating system, you can configure the TA using the firmware-
based configuration utility or AT commands. Procedures for using the firmware-based configuration utility
and AT commands are described in Appendix E.
Before you begin, verify your switch type and TEI with your local ISDN provider and have that information
readily available
1. When installing from CD, insert the MTA128ST/NT System CD into your CD ROM drive. When the
MTA128ST/NT Terminal Adapter AutoRun screen is displayed, click on the Config Utility icon. Follow
the on screen directions to load the Configuration Utility onto your pc.
2. When the Configuration Utility is loaded onto your pc, click Start>Programs>ISDNTA Config Utility.
The Welcome screen is displayed
Do you want the wizard to search for your ISDN TA? with the Yes option enabled. Click Nextto
continue.
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Configuration Utilities
3. Searching for TA screen is displayed with please wait while the configuration utility searches for your
ISDN TA(s). This may take up to 20 seconds. Then the Searching for TA screen with Devices have
been identified. Please select a device to configure
Click Next to continue.
4. The Configuration screen is displayed with Select the type of setup, custom building a new configuration,
custom with an existing configuration, or express with an existing configuration.
From the Setup pull down window you can choose Express (Existing), Custom (Existing), or Custom
(New). The Express (Existing) opens an existing configuration, allowing you to modify some elements of
the configuration. Custom (Existing) opens an existing configuration, allowing you to modify all elements
of the configuration. Custom (New) allows you to customize a new configuration.
I have chosen Custom (New) for this example.
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Configuration Utilities
5. The Network Switch Type screen is displayed with Please select the settings for the Network Switch
Type.
Select the network switch type you listed in the Before You Start section of this chapter.
6. Please select the settings for dynamic bandwidth allocation, high and low sampling period and
throughput, and call bumping.
Click Next to continue.
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Configuration Utilities
7. The TEI (Terminal Endpoint Identifier) screen is displayed with Please select the settings you would like
for Data TEI and Voice TEI.
The TEI is a unique number assigned to the TA at subscription time. The TEI is used by the telephone
central office (CO) to identify the various TAs connected to the ISDN network. The TEI number can be
fixed (range 0 - 63) or dynamic and is assigned automatically at the CO each time the TA connects to
the ISDN interface and powers up.
Click Next when you are finished.
8. The SPID (Service Profile Identifier) North America only, is displayed with Please enter the data SPID,
voice SPID, data directory numbers, and voice directory number of your network.
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Configuration Utilities
SPID is only used in North America. A SPID is the ISDN network parameter for local terminal
identification and tracking. A SPID is assigned by your local ISDN provider when you subscribe, they are
in the form of a string of up to 20 characters. A SPID points to a specific location in the provider’s central
office memory where service and feature parameters are stored.
Click Next when you have entered your SPID information.
9. The Call Control Setup screen is displayed with Please select the settings for call control.
Call Control Setup allows you to set up your terminal adapter and customize how it dials and answers.
You can configure persistent DTR dialing, calling line identification, auto answer data calls, and number
of rings. You can also set the online inactivity timer as well as the dialing method.
Click Next when you are done.
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Configuration Utilities
10. The Data Protocol Setup screen is displayed with Please select the setting you desire for the Data
Protocol.
If you would like the TA to detect the data protocol of an incoming data call and automatically change the
TA’s protocol to match the incoming call, click auto protocol detection check box. Click Next to continue.
11. The Stored Numbers screen is displayed with Please enter the numbers you would like to store.
You can store up to ten phone numbers with up to 25 characters per number. Stored number zero is
used if Persistent DTR Dialing is enabled in Call Control Setup screen.
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Configuration Utilities
12. The Port Control Setup 1 screen is displayed with Please select the settings you would like for the DTR
detect time, DCD drop time, DTR, DSR, CTS, and DCD signals.
Click Next when you have finished entering your settings.
13. The Port Control Setup II screen is displayed with Please select the settings you would like for the
Default Parity, Default Bit Rate, number of Data Bits, number of Stop Bits, Flow Control, and synchronous
mode.
Click Next when you are finished.
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Configuration Utilities
14. The POTS Port screen is displayed with Please select the settings for the PORTS port.
When your selections are complete, click Next.
15. The Save Configuration screen is displayed with Please enter the name to store the configuration as in
the .ini file.
You can enter any name up to 35 characters or less in the Store Configuration as: window. Click Next
after you have selected a name.
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Configuration Utilities
16. The Load Configuration screen is displayed with To load the configuration now, click Next.
17. Your ISDN TA is currently being configured.
When the Finish button becomes active, click Finish.
18. The Configured screen is displayed. Click Finish to exit the Configuration Utility.
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AT Commands, S-Registers, and Result Codes
Chapter 4: AT Commands, S-Registers, and Result Codes
MTA128ST/NT Commands and S-Registers
All references to “TA” in this chapter refer to the MTA128ST/NT. This chapter also assumes knowledge of
issuing AT commands. <CR> refers to the carriage return character (typically generated by pressing the
ENTER or RETURN key on the keyboard).
For command execution details see the additional documents on this CD.
AT Commands
The TA’s command buffer can store 80 characters, including spaces and other characters used in
telephone numbers. If you mistype a command string, you can edit it by using the backspace or the delete
key, but only before you press <CR>. As you type a command string, it appears on your monitor screen,
letting you verify your input as you type it.The table below lists the AT commands recognized by the TA.
If your MTA128ST/NT is connected to a computer terminal, you can send AT commands to the MTA128ST/
NT by entering them on the keyboard. If your MTA128ST/NT is connected to a computer, you can send AT
commands to the MTA128ST/NT by typing them in the terminal window of a data communications program
such as HyperTerminal.You can also send some AT commands indirectly by configuring your data
communications program.
To enter AT commands, use the following format: AT <command string> <cr>.The characters AT cause
the MTA128ST/NT to interpret the following string as a command. The command string consists of one or
more commands.The carriage return character, <cr>, sends the command string to the MTA128ST/NT. If
you are entering a command string in your communication program’s terminal window, insert the carriage
return character by pressing the ENTER key on your keyboard. If configuring a communications program,
you typically must insert the carriage return character by adding ^M to the end of the command string.
The MTA128ST/NT has three modes of operation: offline command mode (the default state), online
command mode, and data mode. The MTA128ST/NT responds to AT commands only when it is in one of
the command modes. After the MTA128ST/NT establishes a connection and goes online in data mode, it
interprets any further characters you enter as data rather than as commands and transmits them to the
remote device.
When the MTA128ST is in data mode, you can switch it to online command mode by sending it an escape
sequence.The MTA128ST/NT responds to two types of escape sequences:
•
In-band where the escape sequence is part of the data stream.
The in-band escape sequence is +++AT<cr>. To change the in-band escape character (+),
change the value in register S2.
•
Out-of-band where the escape sequence is outside the data stream.The out-of-band escape
sequence is <break >AT<cr>. You can send the break signal in the out-of-band escape sequence
only from software, not by pressing SHIFT+BREAK on your keyboard.
When it detects the escape sequence, the MTA128ST/NT enters online command mode where it responds
to commands while maintaining the connection with the remote device.
The MTA128ST/NT’s command buffer can store 80 characters, including spaces and other characters
used in telephone numbers. If you mistype a command string, edit it by using the backspace or the delete
key but only before you press ENTER. As you type a command string, it appears on your monitor screen,
letting you verify your input as you type it.
The AT commands recognized by the MTA128ST/NT are listed by function in this chapter first in an
abbreviated list. For an alphabetical list of AT commands, see the AT commands documents on the CD
included with this product.
AT Commands by Function
Command Execution
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AT Commands, S-Registers, and Result Codes
AT
A/
Attention code
Repeat AT Command
Command execution
In-band escape code
Out-of-band escape code
Return or Enter
+++AT<CR>
<BREAK>AT<CR>
General Information Commands
In
Display Product Information
Ln
!L
List Active Profile Information
Display Network Configuration
>MIBn
Management Information Block (MIB) Information
Network Configuration Commands
**s
User-User Information Element String
%A97=n
>A0=n
!C0=n
!C6=n
*!C6=n
!D0=n
!D1=n
!D3=n
*!D3=n
!DNn
*!DNn
!ENn
*!ENn
>MULT=N
!Nn=s
*!Nn=s
Dialing Method
Type of Coding
Network Switch Type
Data SPID
Voice SPID
V.120 LLC Information Element
V.110 BC Information Element (some models only)
SAPI-0 Data TEI
SAPI-0 Voice TEI
Disable Data DN/MSN n
Disable Voice DN/MSN n
Enable Data DN/MSN n
Enable Voice DN/MSN n
Multi-point setting
Data DN/MSN n
Voice DN/MSN n
Serial Port Configuration Commands
&Cn
DCD (Data Carrier Detect) Control
&Dn
$Dn
&En
DTR (Data Terminal Ready) Control
Persistent DTR Dialing
Flow Control
&Mn
Asynchronous Mode
V.110 Network Rate (some models only)
Parity
Data Bits
Stop Bits
CTS (Clear To Send) Control
CTS/RTS Interaction Control
DSR (Data Set Ready) Control
Serial Port Speed
$MBn
@P3=n
@P4=n
@P6=n
&Rn
&RFn
&Sn
$SBn
%Sn
Serial Port Mode
#Xn
Send Multiple Xoff Characters
General Configuration Commands
@CONFIG Configuration Menu
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AT Commands, S-Registers, and Result Codes
En
Command Mode Echo
Escape Sequence Options
Load Factory Profile
Management Mode
Quiet Mode
%En
&Fn
%Mn
Qn
Sr=n
Sr?
Set S-register
Read S-register
Vn
&Wn
Xn
Z
&Zn=
!Z=n
Verbose Result Codes
Store Active Profile
Connect Messages
Reset to Stored Profile
Store Telephone Number
Rate Adaptation/Data Protocol
Digital (Data) Call Commands
A
Answer Digital Call
Dial Digital Number
Dial Stored Number
Hang up Digital Call
Digital Call Hold-off Time
Channel Bundling
Return Online
Dn
DSn
Hn
!Hn
&Jn
O
Analog (POTS) Call Commands
*An
Answer Analog Call
*Bn
*Dn
Send Analog Dial Digit
Dial Analog Number
*Hn
Hang up Analog Call
*!Hn
!RXGn
!TXGn
Analog Call Hold-off Time
POTS Port Receive Gain
POTS Port Transmit Gain
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AT Commands, S-Registers, and Result Codes
S-Registers
S-registers are sections of memory in which values are stored that affect how the TA operates. S-registers
are so-called because each has a name that begins with the character S. Use the Sr=n command to
assign a value to an S-register or use the Sr? command to read the current value of an S-register. S-
registers are stored in non-volatile RAM (NVRAM) by using the &W0 command. ATZ<CR> restores S-
registers to values stored in NVRAM if any were stored using the &W0 command, otherwise they revert to
factory default settings in ROM.Table 4-2 summarizes the available S-registers and their function.
See the additional documents on this CD for more information on each S register.
S-Register Summary
S-Register
Function
S0
Rings Until Answer
S1
Ring Count
S2
Escape Character
S3
Carriage Return Character
S4
Line Feed Character
S5
Backspace Character
S7
S8
Wait for Connection (Abort Timer)
Pause Time for Comma
S10
S25
S26
S27
S29
S30
S31
S32
S34
S44
S45
S46
S49
S50
S51
S52
S53
S54
S55
S56
S57
S58
S59
S60
S61
S62
DCD Drop Time
DTR Drop Time
Delay DTR Monitoring After Connect
RS-232 CLEAR Synchronization Sequence
On-line Inactivity Timer Period
On-line Inactivity Timer
Maximum Re-dial Timeout Value
Escape Sequence Timeout
Maximum Escape Sequence Length
POTS Port Ring Frequency
Use Dial Tone From Central Office
Pulse-Dial Recognition
POTS Port Dial Tone Gain
Caller Line ID (CLI)
POTS Port Dial Tone Suppression
Auto-Protocol Detection
Maximum X.75 Buffer Size
Force 56Kbps B-Channel Data Rate
Information Transfer Capability for POTS Port Calls
Calling Party Number Information Element Settings
Called Party Number Information Element Settings
Client-side PPP/ML-PPP Authentication Protocol Negotiation
Dynamic Bandwidth Allocation (DBA) Scheme
Bandwidth-On-Demand (BOD) High Threshold Sampling Period
Bandwidth-On-Demand (BOD) High Throughput Threshold
Bandwidth-On-Demand (BOD) Low Threshold Sampling Period
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AT Commands, S-Registers, and Result Codes
S63
S64
S65
S66
S67
S68
S69
S70
S71
S73
S74
S75
S76
S77
S80
S81
S82
S84
S85
S86
S87
S154
Bandwidth-On-Demand (BOD) Low Throughput Threshold
Call Bumping (CB)
POTS Call Bump Forwarding Delay
Country Selections for POTS Ring Signal
Single or Dual Cadence POTS Ring Signal
POTS Ring Signal First Active Duration
POTS Ring Signal First Idle Duration
POTS Ring Signal Second Active Duration
POTS Ring Signal Second Idle Duration
MultiLink Endpoint Discriminator Type
Maximum CLEAR Buffer Size
Maximum V.110 Buffer Size* (ST only)
V.110 Network Rate* (ST only)
V.110 Network Rate Control* (ST only)
Persistent DTR Dialing Delay
Link Setup Timeout
Delay Before Trying V.110*
Data to Terminal Delay
Data to B-channel Delay
V.110 T1 Time-out*
INS64 Analog Call Origination Delay
B-Channel Answer Rate
* Note: V.110 is supported by some MTA128ST models only.
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AT Commands, S-Registers, and Result Codes
Result Codes
When the MTA128ST/NT receives an AT command from the computer or terminal, it attempts to execute
the command, then sends a status message to the computer or terminal that reports the result of the
command. The MTA128ST/NT provides you with several of these response messages, or result codes,
which can be displayed on your monitor or intercepted and used by your communications software. Using
the V command, you can select whether the result codes are terse (numbers) or verbose (words).
The MTA128ST/NT’s result codes are listed below. Note that the speed of an ISDN channel is always
either 56 Kbps or 64 Kbps. Connect messages indicate the speed of the connection between the
MTA128ST/NT and your computer or terminal.
TERSE VERBOSE
DEFINITION
0
1
2
3
OK
CONNECT
RING
NO CARRIER
TA executed the command without error
TA established an ISDN connection
TA detected a ring caused by incoming call
TA did not detect carrier within time allotted by register
S7
4
ERROR
Error in the AT command
5
6
7
CONNECT 1200
NO DIALTONE
BUSY
TA connected at 1200 bps
TA has a poor connection to ISDN network
TA detected a busy signal
8
9
CONNECT 300
CONNECT 600
CONNECT 2400
CONNECT 4800
CONNECT 9600
CONNECT 19200
CONNECT 56000
CONNECT 57600
CONNECT 64000
CONNECT 38400
TA connected at 300 bps
TA connected at 600 bps
TA connected at 2400 bps
TA connected at 4800 bps
10
11
12
14
17
18
19
28
79
80
82
TA connected at 9600 bps
TA connected at 19200 bps
TA connected at 56000 bps
TA connected at 57600 bps
TA connected at 64000 bps
TA connected at 38400 bps
PPPC PROTOCOL TA using Point-to-Point protocol
HDLC PROTOCOL TA using raw HDLC mode
V.110 PROTOCOL TA using V.110 rate adaption protocol (Note: V.110 is
supported on some MTA128ST models only.)
83
84
87
V.120 PROTOCOL TA using V.120 rate adaption protocol
X.75 PROTOCOL
TA using X.75 rate adaption protocol
CLEAR PROTOCOL TA using CLEAR (transparent) protocol
Using AT Commands to Operate the MTA128ST/NT
You can configure and operate the MTA128ST/NT entirely with AT commands if you like. But remember,
you can issue AT commands only from a terminal or from a computer running a communications program
in terminal mode. This section describes how to use AT commands for basic operations, such as calling,
answering a call, and hanging up.
Modes of Operation
The MTA128ST/NT has three modes of operation.They are:
•
Offline Command Mode—MTA128ST/NT communicates with the terminal or computer and responds to
AT commands. There is no data communications link with a remote device.
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AT Commands, S-Registers, and Result Codes
•
•
Data Mode—MTA128ST/NT enters data mode when it makes a successful data communications link with
a remote device. In data mode, the TA can send and receive data, but it does not respond to AT
commands. Instead it treats them as data and transmits them to the remote device.
Online Command Mode—MTA128ST/NT responds to AT commands while maintaining a data
communications link; however, transmission of data is suspended. To enter online command mode from
data mode, type the escape sequence +++AT<cr>. To return to data mode from online command mode,
type ATO<cr>.
Making a Call
Before you can place a data call, configure the MTA128ST/NT for the local switch type, serial port speed,
and the data type of the ISDN device you want to call. See Chapter 3, Configuration Utilities.
Dialing
To dial a number using AT commands, you must first start a data communications program. In the
program’s terminal mode, type ATDxxxxxxx<cr>, where xxxxxxx is the telephone number you want to
dial, and <CR> is the carriage return character that is sent when you press the ENTER key, such as
ATD7853500<cr>.The dial string can contain up to 80 characters.
To place an ML-PPP call, use an ampersand character (&) to join two telephone numbers, such as
ATD7853500&7853502<cr>.The telephone numbers can be the same or different. Using this method, two
B-channels are activated to transmit data at an aggregate speed of 128 Kbps.
To make it easier to read the dial string, you can use hyphens, spaces or parentheses. These characters
are ignored by the MTA128ST/NT. For example, the MTA128ST/NT would read the following dial strings the
same way:
ATD17637853500 <cr>
ATD 1-763-785-3500 <cr>
ATD 1 (763) 785-3500 <cr>
Channel Bundling Flag Dialing
The command AT&Jn is used to indicate whether outgoing calls should be made on two B-channels by
default. The command AT&J1&W0<cr>, configures the TA to place a call, dialing on two B-channels by
default. If no second number is given in the dial string, that single number is dialed twice. This
compensates for the interworking issues with Windows Dial-Up Networking. On the other hand, if the user
explicitly indicates two numbers in the dial string, then two numbers are dialed (e.g., ATD7853500&785
3502<cr>).The command AT&J0&W0<cr>, disables automatic call bundling. Note other valid characters
joining two telephone numbers include a plus sign (+), and an exclamation mark (!).
Note: In Windows Dial-Up Networking, if the Use Country Code and Area Code box is checked in the
Properties window for dial-up connection, the bundling modifier (i.e., &, + or !) is removed from the
dialing string when the user attempts to make a connection. The solution is to not check the Use Country
Code and Area Code box or to simply add the bundling dial modifier to the phone number at the time of
connection.
Canceling a Call
To cancel a call before the MTA128ST/NT makes a connection, press any key.
Storing a Telephone Number
To store a telephone number, type &Zn=x in terminal mode, where n is the number of the memory register
in which the number is to be stored, and x is the dial command string that you want to store. For example,
type AT&Z9=763-785-3500 <cr> to store the number 763-785-3500 in memory register 9.
Dialing a Stored Telephone Number
To dial a stored telephone number, type DSn in terminal mode, where n is the location of the number you
wish to dial. For example, type ATDS3 <cr> dials a telephone stored in memory register 3 location.
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AT Commands, S-Registers, and Result Codes
Displaying a Stored Number
To display a stored telephone number, type &Zn? in terminal mode, where n is the memory register in
which the number is stored. For example, type AT&Z5? <cr> to display the telephone number in memory
register 5.To list all ten telephone numbers stored in memory, type ATL <cr>.
Answering a Call
You can answer incoming calls to the MTA128ST/NT either manually or automatically. When the TA
detects an incoming call, it turns on the RI signal on the V.24 interface and sends a RING result code to
the computer or terminal after each ring. If autoanswer is enabled, the TA automatically answers the call.
You can manually answer the call with the A command. Both methods are described below.
Answering Manually
If your communication program is in terminal mode when the RING result code appears on your monitor,
you can manually answer the call by typing ATA <cr>.
Answering Automatically
To cause the MTA128ST/NT to automatically answer a call:
1. Enable autoanswer by setting register S0 to the ring on which you want the TA to answer (e.g., in
terminal mode, type S0=4 to make the TA answer on the fourth ring). You also can use either of the
configuration utilities to the turn on autoanswer and set the number of rings.
2. Make sure that the TA is offline.
The TA answers the call after the number of rings specified by S0.To disable autoanswer, use a configuration
utility or the command S0=0.
Note: If the user wants to accept calls while DTR is low, the TA must be configured to ignore DTR. To
do this, enter AT&D0<cr>. With this configuration, the TA can accept calls while DTR is low. If this
configuration setting is not made, the TA rejects incoming calls until DTR is high while calls comes in.
Hanging Up
To hang up a call, escape to online command mode (+++AT<cr>), then enter the H command
(ATH<cr>).The escape sequence and hang up command can be combined into one command string:
+++ATH<cr>.
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Troubleshooting
Chapter 5: Troubleshooting
Troubleshooting the TA
Introduction
This chapter describes basic problems you may run into with your MTA128ST/NT and how to solve them.
Your MTA128ST/NT was thoroughly tested at the factory before it was shipped. If you are unable to make a
successful connection, or if you experience data loss during your connection, it is possible that the
MTA128ST/NT is defective. However, it is more likely that the source of your problem lies elsewhere.
Problems you may encounter include the following:
• None of the LEDs light when the MTA128ST/NT is on.
• The MTA128ST/NT does not respond to commands.
• The MTA128ST/NT dials but cannot make a connection.
• You can place data calls but not voice calls, or vice versa.
• You cannot place two simultaneous data calls.
• The MTA128ST/NT disconnects while online.
• The MTA128ST/NT cannot connect when answering.
• File transfer appears slower than it should be.
• Data is being lost.
• There are garbage characters on the monitor.
If you experience problems, please check the following possibilities before calling Tech Support (see
Chapter 7).
Specific Troubleshooting Situations
SITUATION 1: The !Hn and *!Hn commands can be very useful for certain RAS environments that require
at least 1 second to initialize a port after a call has disconnected (such as Citrix and Novell). For example,
when a call disconnects, Citrix and Novell will begin initializing the port that just disconnected. However, it
typically takes more than 1 second and during that time a call may be received by the digital or analog
port.When this happens, Citrix and Novell do not answer the call nor do they finish the initialization
process. To prevent this problem, setting !H5 and/or *!H5 will set the TA to hold of digital and/or analog
calls for 5 seconds after the respective port(s) disconnect(s). This should give enough time for the digital
and/or analog port to be initialized by Citrix or Novell and enter the “waiting for a call” state.
SITUATION 2: The autobauding code cannot differentiate between 7 data bits, no parity, 1 or 2 stop bits
(7N1 or 7N2) and 7 data bits, mark parity, 1 or 2 stop bits (7M1 or 7M2). The TA assumes 7 data bits, mark
parity, 1 stop bit (7M1) and this case covers 7N1, 7N2, 7M1 and 7M2. However, if for some reason the
assumption of 7M1 causes a problem, then there is a workaround. The addition of the %S3 command and
use of $SBn, @P3=n, @P4=n, and @P6=n will help work around this limitation. See the description for the
%Sn command.
SITUATION 3: The autobauding code cannot differentiate between 8 data bits, no parity, 1 or 2 stop bits
(8N1 or 8N2) and 7 data bits, space parity, 1 or 2 stop bits (7S1 or 7S2). The TA assumes 8 data bits, no
parity, 1 stop bit (8N1) and this setting covers 7S1, 7S2, 8N1 and 8N2. However, if for some reason the
assumption of 8N1 causes a problem, then there is a workaround. The addition of the %S3 command and
use of $SBn, @P3=n, @P4=n, and @P6=n will help work around this limitation. See the description for the
%Sn command.
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Troubleshooting
SITUATION 4: The autobauding code does not report the number of stop bits.This may become a problem
if the terminal is expecting a certain number of stop bits. The addition of the %S3 command and use of
$SBn, @P3=n, @P4=n, and @P6=n will help work around this limitation. See the description for the %Sn
command.
Debugging/Logging/Troubleshooting Commands
The AT commands in this section can be used in attempting to troubleshoot or debug a current problem.
Some commands may be enhanced or limited by the debugging/logging/troubleshooting S-registers. For
complete descriptions of the commands and S-registers, see the additional documents on this CD.
Debugging/Logging/Troubleshooting Command Summary
AT Command
Function
>Dn
*FSn
*Ln
>LOG
>Sn
Embedded Protocol Analyzer (EPA)
Reset TA
Fatal Error Information
Display Logging Buffer Contents
Logging Variables
>TIME
*V
Display Current Timestamp
Various State Information
Debugging/Logging/Troubleshooting S-Registers
The S-registers in this section can be used in attempting to troubleshoot, debug, or even correct a current
problem. Some S-registers modify functionality of various features. Some S-registers modify the
functionality of the debugging/logging/troubleshooting commands described in the additional documents on
the system CD.
Debugging/Logging/Troubleshooting S-Register Summary
S-register Function
S47
S48
S72
S78
S90
S91
S92
S93
S94
S95
S96
S98
S99
Pulse-dial Maximum Break Pulse Period
Pulse-dial Maximum Interdigital Pause
EuroISDN Variant
Maximum Allowed V.110 Network Rate (some models only)
Local PPP Capabilities
Remote PPP Capabilities
Channel ID Information Element Octet 3 Settings
Blacklisting
Minimum Buffer Space After Trigger
Logging Buffer Functionality
Decode (EPA) Buffer Functionality
ISDN_MSG Size
Startup Options
S100 Flow Control High Threshold
S101 Flow Control Low Threshold
S102 Data to Save for Decoding
MTA128ST/NT
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Troubleshooting
None of the LEDs light when the MTA128ST/NT is on
When you turn on the MTA128ST/NT, the LED indicators on the front panel should flash briefly as the TA
runs a self-test. If the LEDs remain off, the TA probably is not receiving power.
•
•
•
•
Make sure the MTA128ST/NT’s power switch is on, especially if you normally turn on the TA by turning
on a power strip.
If the power supply is plugged into a power strip, make sure the power strip is plugged in and its power
switch is on.
Make sure the power supply module is firmly connected to the MTA128ST/NT and to the wall outlet or
power strip.
If the power strip is on and the MTA128ST/NT is switched on, try moving the TA’s power supply to
another outlet on the power strip.
•
•
Test that the outlet is live by plugging a lamp into it.
The MTA128ST/NT or power supply may be defective. If you have another Multi-Tech MTA128ST/NT, try
swapping MTA128ST/NTs. If the problem goes away, the first MTA128ST/NT or power supply may be
defective. Call Tech Support for assistance.
Caution: Do not under any circumstances replace the power supply module with one designed for
another product, as it may damage the MTA128ST/NT and void your warranty.
The MTA128ST/NT does not respond to commands
•
Make sure the MTA128ST/NT is plugged in and turned on. (See None of the LEDs Light When the
MTA128ST/NT Is On.)
•
•
Try resetting your MTA128ST/NT by turning it off and on.
Make sure you are issuing the MTA128ST/NT commands from the data communications software, either
automatically, or manually in terminal mode. (You cannot send commands to the MTA128ST/NT from the
DOS prompt.)
•
•
Make sure you are in terminal mode in your data communications program. Then type AT and press
ENTER. If you get an OK response, your connections are good and the problem likely is in your
phonebook entry or session settings.
If you don’t get an OK, the problem may still be in the communications software. Make sure you have
done whatever is necessary in your software to make a port connection. Not all communications pro-
grams connect automatically to the COM port. Some connect when the software loads and remain
connected until the program ends. Others, like MultiExpress Terminal, can disconnect without ending the
program (make sure the Connect icon looks plugged in). MultiExpress Terminal also allows multiple
terminals to be open, but only one can access the MTA128ST/NT at a time. If MultiExpress Terminal
reports that it cannot make a connection, yet the MTA128ST/NT’s TR indicator is on, click on the Window
menu to see if more than one terminal is open. The MTA128ST/NT’s TR indicator shows that the
software has made a connection with the TA through the COM port.open, but only one can access the
MTA128ST/NT at a time. If MultiExpress Terminal reports that it cannot make a connection, yet the
MTA128ST/NT’s TR indicator is on, click on the Window menu to see if more than one terminal is open.
The MTA128ST/NT’s TR indicator shows that the software has made a connection with the TA through
the COM port.
•
•
Your communications software settings may not match the physical port the MTA128ST/NT is connected
to. The serial cable may be plugged into the wrong connector—check your computer documentation to
make sure. Or you may have selected a COM port in your software other than the one the MTA128ST/
NT is physically connected to—compare the settings in your software to the physical connection.
If the MTA128ST/NT is on, the cable is plugged into the correct port, the communications software is
configured correctly, and you still don’t get an OK, the fault may be in the serial cable. Make sure it is
firmly connected at both ends.
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Troubleshooting
•
•
Is this the first time you have used the cable? If so, check the cable description on the packaging to make
sure the cable is correct for your computer.
Peripheral expansion cards, such as bus mouse and sound cards, may include a serial port preconfig-
ured as COM1 or COM2. The extra serial port, or the card itself, may use the same COM port, memory
address, or interrupt request (IRQ) as your communications port. Be sure to disable any unused ports.
To look for address or IRQ conflicts, select File, Run in Program Manager, type MSD, and press ENTER.
Then select Mouse, COM Ports, and IRQ Status and note the addresses and IRQs that are in use. If you
find an IRQ conflict, note which IRQs are not being used, then change one of the conflicting devices to
use one of the unused IRQs. If you find an address conflict, change the address of one of the conflicting
devices.
To change a port address or IRQ, double-click the Control Panel icon, then the Ports icon. Click on the
port you want to change, click Settings, click Advanced, and select the new port address and/or interrupt.
If you wish to use COM3 or COM4, note that COM3 shares an IRQ with COM1, as does COM4 with
COM2, so you should change their IRQs to unused ones, if possible.
Right-click on My Computer, select Properties from the menu, click on the Device Manager tab, double-
click on Ports, then double-click on the Communications Port your MTA128ST/NT is connected to. In the
port’s Properties sheet, click on the Resources tab to see the port’s Input/Output range and Interrupt
Request. If another device is using the same address range or IRQ, it will appear in the Conflicting
Device List. Uncheck Use Automatic Settings to change the port’s settings so they do not conflict with the
other device, or select the port the conflicting device is on and change it instead. If you need to open your
computer to change switches or jumpers on the conflicting device, refer to the device’s documentation.
•
•
The serial port may be defective. If you have another serial port, install the MTA128ST/NT on it, change
the COM port setting in your software, and try again.
If using serial rates above 115,200 baud, make sure the serial port can handle higher rates. Most
standard serial ports have a maximum serial rate of 115,200. To handle serial rates of 230,400 baud and
460,800 baud, you need a high-speed serial port Even though some terminal emulation programs allow
you to select higher rates, the serial ports cannot always handle those rates.
•
The MTA128ST/NT may be defective. If you have another Multi-Tech MTA128ST/NT, try swapping
MTA128ST/NTs. If the problem goes away, the first MTA128ST/NT is possibly defective. Call Tech
Support for assistance (see Chapter 7).
The MTA128ST/NT dials but cannot make a connection
There can be several reasons the MTA128ST/NT fails to make a connection. Possibilities include
•
•
•
•
•
•
•
Lack of a proper physical connection to the communication line.
A busy signal.
A wrong number.
No terminal adapter at the other end.
A faulty communications device, computer, or software at the other end.
Incompatibility between communications devices.
An improperly configured MTA128ST/NT.
Narrow the list of possibilities by using extended result codes. To enable them, enter ATV1X2 and press
ENTER while in terminal mode or include V1X2 in the MTA128ST/NT’s initialization string (V1X2 is enabled
by default). When you dial again, the MTA128ST/NT reports the call’s progress.
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Troubleshooting
•
If the MTA128ST/NT reports NO DIALTONE, check that the ISDN S/T cable is securely connected to
both the TA’s ISDN jack (not the PHONE jack) and the ISDN network terminator or wall jack. If the cable
looks secure, try replacing it. If that doesn’t work, the problem may be in your building’s telephone
installation. Make sure ISDN cables on all devices are wired straight-through (pin 1 to pin 1, pin 2 to pin
2, etc.) and do not have reversed pairs. The cable must have at least the middle four pins (pins 3, 4, 5,
and 6) connected. A reversed pair on the U (phone company) side is not important, but a reversed pair
on the S/T (your) side can create problems if you have more than one device, since multiple devices
attached to the S/T interface must all have the same polarity.
•
•
If the MTA128ST/NT reports BUSY, the other number may be busy, in which case you should try again
later.
If the MTA128ST/NT reports NO CARRIER, no connection was made. You might have dialed the correct
number but the other computer or software was turned off or faulty. Check the number and try again, or
try calling another system to make sure your TA is working. Also, check that you accurately configured
the TA with the correct switch type, TEIs, data protocols, and other parameters needed for a successful
call (see Chapter 3).
You can place data calls but not voice calls or vice versa
•
You might not have ordered both voice and data service from your ISDN provider. Check your contract or
latest statement of service from your ISDN provider.
•
Your ISDN provider may have programmed the switch incorrectly. Call the provider.
You cannot place two simultaneous data calls
•
You may not have ordered an ISDN line configuration that supports two simultaneous calls. Check your
contract or latest statement of service from your ISDN provider. Also, your ISDN provider may have
programmed the switch incorrectly. Call the provider.
•
•
You may have misconfigured your MTA128ST/NT to dial two simultaneous data calls. The command
AT&J1&W0<cr> is used to indicate whether outgoing calls should be made on two B-channels by default.
You may be using the wrong bundling dial modifier (e.g., ATD7853500&7853502<cr>). The ampersand in
this command string is correct. Other valid characters joining two telephone numbers include a plus sign
(+) and an exclamation mark (!).
Note: In Windows 98/NT/ME, if the Use Country Code and Area Code box is checked in the Properties
window for dial-up connection, the bundling modifier (i.e., &, + or !) is removed from the dialing string
when the user attempts to make a connection. The solution is not to check the Use Country Code and
Area Code box or to simply add the bundling dial modifier to the phone number at the time of connection.
The MTA128ST/NT disconnects while online
•
Check for loose connections between the MTA128ST/NT and the computer, the ISDN jack, and AC
power.
•
•
The problem may have originated at the other end of the line. Try again.
If you were online with a BBS or online service, it may have hung up on you because of lack of activity on
your part or because you exceeded your time limit for the day. Try again.
The MTA128ST/NT cannot connect when answering
•
Autoanswer may be disabled. Turn on autoanswer in your data communications program or send the
command ATS0=1 to your MTA128ST/NT in terminal mode.
Note: If the user wishes to accept calls while DTR is low, the MTA128ST/NT must be configured to
ignore DTR. This is accomplished by entering AT&D0<cr>. With this configuration, the MTA128ST/NT is
able to accept calls while DTR is low. If this configuration setting is not made, the TA rejects incoming
calls until DTR is high while the calls comes in.
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Troubleshooting
File transfer appears slower than it should be
•
•
•
If you have a Universal Asynchronous Receiver/Transmitter (UART) that is compromising data
throughputs, we recommend replacing it with a special I/O card.
If you are running under Windows 3.1 and have a 16550AFN UART, replace the Windows serial driver,
COMM.DRV, to take full advantage of the UART’s speed.
Check the serial port baud rate in your communications software, and make sure it is set as high as your
UART allows.
Data is being lost
•
•
•
Your UART may not be reliable at serial port speeds over 9600 bps or 19,200 bps. Reset your serial port
speed to a lower rate, or replace your serial port with a faster one.
Check the serial port baud rate in your communications software, and make sure it is set as high as your
UART allows.
Make sure the flow control method you selected in software matches the method selected in the
MTA128ST/NT.
Garbage characters appear on the monitor
Your computer and the remote computer may be set to different parities. Check with the remote system
and set your communications software to use the same parity as the remote system.
Making a V.120 call, caller gets a NO CARRIER message after dialing the number.
Some switches don’t support ISDN SETUP messages that contain a LLC (low layer compatibility) element.
When these switches receive an LLC in the SETUP, they immediately reject the call and a NO CARRIER
message displays. Disable LLC for V.120 calls by issuing the command AT!D0=0.To enable LLC again for
V.120 calls, issue the command AT!D0=1 (the default setting).
Making a V.110 call, caller gets a NO CARRIER message after dialing the number.
Some switches don’t support extended BC (bearer capability) information in the ISDN SETUP message,
such as the one normally sent by V.110 data protocol. When these switches receive a BC with extended
capability information in the SETUP, they immediately reject the call and a NO CARRIER message
displays. Disable sending extended BC information for V.110 calls by issuing the command AT!D1=0.To
enable sending extended BC information for V.110 calls, issue the command AT!D1=1 (the default setting).
Note:V.110 is supported on some MTA128ST models only.
When using X.75 data protocol to transfer data via the Zmodem, the Zmodem displays Intermittent bad
packet errors and data throughput drops.
This occurs in cases when the X.75 packet size is greater than 1024 bytes and the terminal adapter
sending the file has a fast serial baud rate (e.g., 115200 bps) and the terminal adapter receiving the file
has a slow serial baud rate (e.g., 19200 bps). To reduce or possibly eliminate this, reduce the X.75 packet
size (S53) to a value less than or equal to 102 bytes (e.g., ATS53=512). However, if you set the receiving
terminal adapter’s serial baud rate nearly equal to or greater than the serial baud rate of the sending
terminal adapter, then the packet size can be greater than 1024, and Zmodem transfers the data without
bad packet errors.
The MTA128ST/NT won’t accept V.120 calls from a 3Com Impact IQ terminal adapter. The Impact IQ
displays a connected status, but the MTA128ST/NT does not.
The MTA128ST/NT is looking for a SABME command from the Impact IQ to finish establishing the V.120
connection. However, the Impact IQ won’t send a SABME until it has data to send. Have the Impact IQ
send a character by pressing any key (such as the space bar) on the terminal attached to the Impact IQ.
The MTA128ST/NT responds with a CONNECT message and displays the key you pressed (e.g., a
space).
MTA128ST/NT receives garbage characters when connected to a 3Com Impact IQ terminal adapter.
Most likely, the Impact IQ has compression turned on. The compression used by the Impact IQ is
incompatible with the compression used by the MTA128ST/NT. Disconnect the data connection and give
the Impact IQ the command AT%CO and then establish the data connection again.The garbage
characters should disappear.
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Troubleshooting
The MTA128ST/NT receives garbage characters after receiving several good characters when connected
to a 3Com Sonix adapter.
Most likely, the Sonix has compression turned on.The compression used by the Sonix is incompatible with
the compression used by the MTA128ST/NT. Disconnect the data connection and the give the Sonix the
command AT”HO (that’s a double quote) and then establish the data connection again.The garbage
characters should disappear.
Each time a 3Com Sonix terminal adapter originates a V.120 call, the MTA128ST answers the call as a
V.110 call.
The Sonix sends V.110 information in the SETUP message to the network. Since the MTA128ST’s default
is with Auto Protocol Detection enabled (ATS52=1), it looks at SETUP information from the Sonix and
determines erroneously that it is a V.110 call. Disable Auto Protocol Detection in the MTA128ST with the
command ATS52=0 and try the connection again.
The MTA128ST/NT won’t connect to an ELSA terminal adapter with the V.120 data protocol.
Most likely, the ELSA terminal adapter has compression turned on. The compression used by the ELSA
terminal adapter is incompatible with compression used by the MTA128ST/NT. Give the ELSA the
command AT%CO to disable compression and try again.
Apple Macintosh Compatibility
The IWay Hopper works with all Macintosh models with a serial port. Some models may require a USB-to-
serial adapter since the MTA128ST/NT is a serial RS-232 device. Scripts are provided for Mac OS 8
through Mac OS X.These scripts also work with Mac OS 7.x with the Apple Internet Connection Kit
installed. (OS 8 and 8.1 have the Apple Internet Connection Kit built-in and Mac OS 8.5 through Mac OS
X have Internet connection capabilities built-in.) If you don’t use the Internet connection abilities provided
by the Mac OS, then you will need to create your own initialization string to suit your needs. Generally,
these initialization strings can be based on the Factory Profile command &Fn to set up the desired
protocol.
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PPP/MLPPP
Chapter 6: Point-to-Point Communications: PPP/MLPPP
Bonding Using the &, ! and + Characters
You can use the &, ! and + characters to bond two channels together when performing channel bonding
(available only with the MLPPP protocol).
When you use the &, +, or ! characters with the MLPPP protocol, the TA regards the number following that
character as a second phone number. When used with MLPPP, the TA first dials the number given before
the &, +, or ! character. After establishing the LCP (Link Control Protocol) and authenticating (if requested),
the TA dials the second number (the number after the &, +, or ! character).
This is an alternative method to set up a MultiLink PPP call as opposed to using the &J1 command, which
dials the given number twice rather than dialing two different numbers.
Example: ATD5551000&5553000 dials 5551000 first, sets up the LCP and authenticates, and then dials
5553000 and sets up the LCP and authenticates on the second B-channel (thus setting up an MLPPP
call).
Note: Using these characters with any protocol other than the PPP/MLPPP protocol does not result in the
use of two B-channels at this time.
Making PPP/MLPPP Connections
Making a PPP or MLPPP connection is not as simple as using a terminal emulation program and dialing
one or two phone numbers. Using the PPP data protocol provided by the TA (!Z=9) requires that the TA
receives PPP-formatted data from the terminal. If the TA does not receive PPP-formatted data, the data is
discarded by the TA and never sent to the peer. The TA can receive PPP-formatted data from the peer and
send it to the terminal, but if it is sending the data to a terminal emulation program running on the terminal,
the data appears as garbage.
The PPP data protocol requires PPP data to be sent from the terminal in order for the data to be sent to
the other side.The MultiLink protocol requires the PPP protocol to establish itself on one B-channel before
the second channel is dialed.The LCP can be established only if data is sent by the terminal to the TA.
Negotiation actually occurs between the local terminal and the remote peer. The TA simply views the
negotiation, so it knows how to negotiate on the second B-channel. When the second B-channel connects,
the local terminal is unaware and doesn’t participate in the LCP negotiation.Therefore, the TA must mimic
the negotiation that was witnessed on the first channel.
For example, sending ATDT5551000&5553000 from a terminal emulation program to the TA does NOT
cause the TA to dial two channels and bring up the 128K LED. However, if that dial command was given by
Windows Dial-Up Networking, for example, then there is a chance that the TA dials two channels and
brings up the 128K LED if the user name and password are correct, if the IP address is okay, and if the
peer allows a MultiLink connection. If MultiLink is not allowed, then the TA uses one channel for the PPP
connection. If the user name or password are invalid or incorrect, the connection is terminated. If an IP
address is in conflict, the connection is terminated as well.
Software Applications that can Format PPP Data
Software applications that can format PPP Data for Microsoft-compatible PCs include Windows Dial-Up
Networking (DUN) and WinSock.
Software applications that can format PPP Data for Apple Macintoshes include OT/PPP, MacPPP,
FreePPP, GearBox, and pppd via Internet Connect (Mac OS X).
Dynamic Bandwidth Allocation (DBA)
Dynamic Bandwidth Allocation (DBA) supports the addition and removal of data channels according to the
level of throughput through the TA and according to analog POTS port use.
If throughput is above a given threshold, a second data channel is added to facilitate higher throughput.
MTA128ST/NT
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PPP/MLPPP
If throughput drops below a given threshold, the second channel is removed to save the cost of having the
second B-channel active but not fully used.
If an outgoing analog call is desired or there is an incoming analog call, a data channel can be bumped
(removed) to allow analog POTS port use.
Bandwidth-on-Demand (BOD) checks the data throughput to determine whether a channel should be
added or removed.
Call Bumping (CB) determines whether a channel needs to be added again (analog call disconnected) or
removed (incoming or outgoing analog call desired) due to activity on the analog POTS port.
To activate Bandwidth-on-Demand or Call Bumping, enable Dynamic Bandwidth Allocation in S-register
S59.
The 128 LED flashes if DBA is active and only one data channel is connected.The 128 LED stops flashing
and remains on after the second B-channel is successfully added. If the second channel is disconnected
due to low throughput or a call-bump, the 128 LED flashes again to indicate that DBA is still active.
If the TA attempts to add a B-channel, but the host is busy or not answering, the TA starts a timer (time is
set in S-register S31). However, if the analog device goes off-hook or an analog call is received, the timer
is stopped and reset. After the analog call finishes, the TA again attempts to add the B-channel. Taking the
analog device off-hook and placing it on-hook again interrupts the timer, thus allowing control over the
amount of time it takes before attempting to add the second channel (rather than waiting for timeout values
specified by S31).
DBA Data Protocols
MLPPP is the only data protocol that currently supports DBA.To start DBA, set &J1 or give two numbers
to be dialed. Otherwise, the TA will not negotiate the MultiLink Protocol (MP) option. If the MultiLink
Protocol option is not negotiated, Dynamic Bandwidth Allocation is not possible.
DBA Features:
Bandwidth-on-Demand (BOD)—S60, S61, S62, and S63
•
Bandwidth-on-Demand (BOD) is not available to the host TA if Dynamic Bandwidth Allocation is disabled
(S59=0) or if the Dynamic Bandwidth Allocation scheme is PPP (S59=2).
•
•
Setting S60=0 disables the BOD feature completely (meaning S61, S62, and S63 are disabled as well).
To calculate High Throughput Average (in Kbps):
– Divide the total number of bits received from the PC (not including start, stop, or parity bits) during the
High Threshold Sampling Period (S60) by the High Threshold Sampling Period (S60) value (in Kbps).
Total bits received ÷ S60 = High Throughput Average
– Or, divide the total number of bits transmitted to the PC (don’t include start, stop, or parity bits) during
the High Threshold Sampling Period (S60) by the High Threshold Sampling Period (S60) value (in
Kbps).
Total bits transmitted ÷ S60 = High Throughput Average
If the average (transmitted or received) exceeds the High Threshold (S61) and only one data channel is
active and the second B-channel is not already in use, the TA attempts to add a second data channel.
•
To calculate Low Throughput Average (in Kbps):
– Divide total number of bits received from the PC (not including start, stop, or parity bits) during the
Low Threshold Sampling Period (S62) by the Low Threshold Sampling Period (S62) value (in Kbps).
Total bits received ÷ S62 = Low Throughput Average
– Or, divide total number of bits transmitted to the PC (not including start, stop, or parity bits) during the
Low Threshold Sampling Period (S62) by the Low Threshold Sampling Period (S62) value (in Kbps).
Total bits transmitted ÷ S62 = Low Throughput Average
If either average (transmitted or received) equals or is less than the Low Threshold (S63) and there are
two active data channels, the TA disconnects the second data channel.
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PPP/MLPPP
•
•
Ideally, the second channel should be added quickly (short High Threshold Sampling Period [S60] with a
relatively small High Throughput Threshold [S61] ). Also, the second channel should not be disconnected
for a relatively long period of time (long Low Threshold Sampling Period [S62] with a small Low
Throughput Threshold [S63] ).
If data transmits or is received in bursts and the TA adds and removes a channel too quickly,
– increase the High Threshold Sampling Period (S60) and the Low Threshold Sampling Period (S62)
and
– decrease the Low Throughput Threshold (S63).
Call Bumping (S-register S64)
•
•
•
Call Bumping is not available to the host TA if Dynamic Bandwidth Allocation is disabled (S59=0) or if the
Dynamic Bandwidth Allocation scheme is PPP (S59=2).
If the analog device goes off-hook or there is an indication of an incoming analog call and both B-
channels are in use by a data call, the TA drops the second B-channel and rings the analog device.
If the analog device goes on-hook or the peer disconnects the analog call, the TA adds the second B-
channel again according to whether BOD is enabled or disabled (S60). If BOD is disabled (S60=0), the
second channel is added immediately. If BOD is enabled (S60 is non-zero), the second channel is added
after the High Threshold Sampling Period (S60) and High Throughput Threshold (S61) determine
whether throughput is high enough to allow adding the second channel.
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Warranty, Service, and Technical Support
Chapter 7: Warranty, Service, and Tech Support
Multi-Tech Systems, Inc. Warranty & Repairs Policies
Warranty
Multi-Tech Systems, Inc., (hereafter “MTS”) warrants that its products will be free from defects in material
or workmanship 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
MERCHANTABILITY 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.
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
Please direct your questions regarding technical matters, product configuration, verification that the
product is defective, etc., to our Technical Support department at (800) 972-2439 or email
billing, etc., to our Repair Accounting department at (800) 328-9717 or (763) 717-5631, or email
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.
MTA128ST/NT
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Warranty, Service, and Technical Support
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 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 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 defective, etc., to our Technical Support department nearest you or email
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.
Copyright © Multi-Tech Systems, Inc. 2001 [appr. 9-10-01]
Online Warranty Registration
If you have access to the World Wide Web, you can register your Multi-Tech product online at
Service
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), a 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 http://www.multitech.com/documents/warranties.
Extended two-year overnight replacement 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 coverages.
MTA128ST/NT
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Warranty, Service, and Technical Support
Please direct your questions regarding technical matters, product configuration, verification that the
product is defective, etc., to our Technical Support department at 800 972-2439 or e-mail
Please direct your questions regarding repair expediting, receiving, shipping, billing, etc., to our Repair
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.
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 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 drawn on a U.S. bank or your company’s purchase order for repair charges.
Repaired units will be shipped freight collect, unless other arrangements are made in advance.
Please direct questions regarding technical matters, product configuration, verification that the product is
defective, etc., to our Technical Support department nearest you, as listed at http://www.multitech.com/
questions regarding repair expediting, receiving, shipping, billing, etc., to our Repair Accounting
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.
International Distributors
Procedures for international distributors of Multi-Tech products are on the Distributor Web site at http://
Replacement Parts
SupplyNet, Inc., can supply you with replacement power supplies, cables and connectors for selected
Multi-Tech products.You can place an order with SupplyNet via mail, phone, fax or the Internet at the
following addresses:
Mail:
SupplyNet, Inc.
614 Corporate Way
Valley Cottage, NY 10989
800 826-0279
Phone:
Fax:
914 267-2420
Email:
Internet:
MTA128ST/NT
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Warranty, Service, and Technical Support
Technical Support
Multi-Tech Systems has an excellent staff of technical support personnel available to help you get the most
out of your Multi-Tech product. If you have any questions about the operation of this unit, please call 800
972-2439 (USA and Canada) or 763 785-3500 (international and local). Please have modem information
available.You can also contact Technical Support by e-mail at the following addresses:
Country
France:
India:
Email Telephone
+(33) 1-64 61 09 81
+91 (124) 6340778
+(44) 118 959 7774
800 972-2439
U.K.:
U.S.A., Canada [email protected]
+763 717-5863
Please note the status of the modem before contacting Technical Support. Status information can include
the state of the LED indicators, screen messages, diagnostic test results, problems with a specific
application, etc.
MTA128ST/NT
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Appendices
Appendix A:Configuration Profiles
Quick Setup Factory Profiles
For quick setup, the MTA128ST/NT includes six Quick Setup Factory Profiles, each of which is configured
for a specific type of port operation.You can load a Quick Setup Factory Profile into active memory by
using the command &Fn, in which n is the number of the profile you wish to load. If you wish, you can then
customize the profile and store it, using the &W command, so that it loads automatically when the
MTA128ST/NT is turned on or reset.These profiles are stored in permanent memory and are not user-
configurable as such.
MTA128ST
&F0
&F1
&F2
&F3
&F4
&F5
Profile 0—Modem-like operation (default)
Profile 1—V.110 async operation
Profile 2—V.120 async operation
Profile 3—X.75 async operation
Profile 4—ML-PPP async operation
Profile 5—SoftBonding Asynchronous Operation
&F6
&F7
Profile 6—HDLC Asynchronous Operation
Profile 7—CLEAR operation
MTA128NT
&F0
&F1
&F2
&F3
&F4
&F5
&F6
Profile 0–Modem-Like Asynchronous Operation
Profile 1–V.120 Asynchronous Operation
Profile 2–X.75 Asynchronous Operation
Profile 3–PPP Asynchronous Operation
Profile 4–SoftBonding Asynchronous Operation
Profile5–HDLC Asynchronous Operation
Profile 6–CLEAR Asynchronous Operation
Quick Setup Example
The following procedure assumes that you want to load, modify, and store Quick Setup Factory Profile 2 as
your default configuration.
1. Select the profile closest to the requirements of your application, in this case— Quick Setup Factory
Profile 2.
2. In terminal mode, type AT&F2 and press ENTER. Quick Setup Profile 2 loads into the MTA128ST/NT’s
active memory.
3. Enter any additional AT commands that you need to customize the selected profile to your application
(see Chapter 4, AT Commands, S-Registers, and Result Codes).
4. Type AT&W0 and press ENTER to save your customized port configuration.
5. Your customized profile now loads automatically whenever the MTA128ST/NT is turned on or reset.
MTA128ST/NT
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Appendices
Appendix B: Ordering Your ISDN Line
There are two ways to specify your ISDN line configuration to your service provider. One is by using ISDN
"ordering codes" in which the user, the Local Exchange Carrier (LEC) or Internet Service Provider (ISP)
are using common nomenclature to describe elements of service. The other way of ordering service is to
use a “building block approach”; where the naming conventions are non-standardized, and the user and
provider must establish a set of provisioning options.
Loop Qualification
The first step in ordering (“provisioning”) an ISDN BRI line is to contact your LEC and verify ISDN BRI loop
availability in your location. There is a distance limitation of approximately 2 miles (1800Kf) from the BRI
loop. Each request for BRI is handled on a case-by-case basis. Once qualified, the LEC requires
information on the type of equipment and protocol used. Most ISDN BRI is configured as “voice and data”
(due to the fact that the LEC network is primarily analog, and ISDN digital technology converts the digital
signal into analog, transports it over their analog lines, and then re-converts it into digital data at the other
end) .
As a general procedure when ordering an ISDN BRI (2B+D) line:
1. Plan ahead; the BRI line order may take four weeks or more to get provisioned.
2. Contact your LEC representative early in the process toensure ISDN BRI loop availability for
your location.
3.
Provide the LEC rep. with your correct address for the BRI service.
4. Provide the LEC rep. with the type of equipment (e.g., “Multi-Tech MTA128TA External ISDN
Terminal Adapter”) and the protocol specifications that it supports. Use the “ISDN
(2B+D) Line Ordering Checklist” provided later in this document for the protocol
specifications.
BRI
5. Provide the LEC rep. with the type of jack required by the MTA128NT (i.e., “RJ45 male 2-wire
U Basic Rate Interface”) .
6. Wait for notification of installation from the LEC; ask the LEC rep what type of switch is used
(AT&T 5ESS and NT DMS-100 are most prevalent).
7. Ensure availability of an “auxiliary” analog line (if you plan on using the MTA128NT’s “AUX”
RJ11 analog connector for a standard telephone connection). Make sure you have a 115 VAC
(60 Hz) power outlet near your computer for the MTA128NT’s two-prong outlet-mounted
power transformer.
8. Record all of the information provided by your LEC.
MTA128ST/NT
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Appendices
Bearer Service
The options of Circuit Switch Voice Bearer (CSV) and Circuit Switch Data Bearer (CSD) are broad
categories of Bearer Services that the phone companies can provide. Different bearer services provide
different types of guarantees about the reliability and synchronization of the data.There are currently ten
different bearer services for circuit-mode, and three services for packet mode.
These bearer services are defined in terms of a number of attributes, which include mode (circuit or
packet), structure (bit-stream or octet-stream), transfer rate (e.g. 64Kbps), transfer capability (basically, the
content, for instance speech, 7Khz audio, video, or unrestricted), and several other attributes that specify
protocols to use and other things.
The attributes of the bearer service are encoded into a Bearer Code, or BC, that is sent everytime a new
connection is being set up. In theory, this allows the switches to dynamically choose from a variety of
different switching paths techniques depending on requirements. In practice, the SPID is used to determine
what services are needed for switching, as this greatly simplifies things for the telephone companies. The
Bearer Code will not be completely ignored, however there are certain bearer services that will be
unavailable on your B-channels, based on how they are configured. It is important to note that the Bearer
Code is sent to the switch every time a connection is established. However, the SPID is only sent to the
switch when you physically attach your equipment to your phone line. At this time the switch gives your
device a Terminal Equipment Identifier (TEI) which is used from then on to identify all connection requests
from that piece of equipment. This allows the switch to look at the TEI and Bearer Code, determine the
SPID, and see if the Bearer Code and the SPID match up.
Using ISDN Ordering Codes (IOCs)
An organization called ISDN Solutions Group, made up of ISDN service providers and equipment
vendors, was formed to simplify the often complex task of ordering an ISDN line. This method, supported
by most (but not all) service providers, uses ISDN ordering codes to define the ISDN line configuration.
Your ISDN TA has been tested to operate with the following ordering codes: B1, Capability C, Capability R,
I2, J2, J3, Capability S, and M5, as described in the following sections.
B1 (previously "Generic Data B")
This ISDN line ordering code supports:
• 1B Service,
• Data only on 1 B channel, and
• One directory number.
Capability C (previously "Generic Data C")
This ISDN line ordering code supports:
• 1B Service,
• Alternate voice and data on one B channel, and
• One directory number.
Capability R (previously "Generic Data I")
This ISDN ordering code supports:
• 2B Service,
• Data only on each B channel, and
• Two directory numbers.
Applications for Capability R include:
• 115.2K or 128K bps data only (no voice capability, and
• Generic 115.2K/128K bps data transfer applications (including remote access and LAN/WAN
connectivity and telecommuting).
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Appendices
I2 (previously "Generic Data I-1DN")
This ISDN ordering code supports:
• 2B Service,
• Data only on each B channel, and
• One directory number.
I2 is not available on the Northern Telecom switch. Two directory numbers are required for 2B operation; in
this case use J2.
J2 (previously "Generic Data J")
This ISDN ordering code supports:
• 2B Service,
• alternate voice and data on one B channel, data only on other B channel, and
• Two directory numbers.
J3 (previously "Generic Data J-1DN")
This ISDN ordering code supports:
• 2B Service,
• alternate voice and data on one B, data only on other B channel, and
• One directory number.
J3 is not available on the Northern Telecom switch. Since two directory numbers are required for 2B
operation, use J2.
Capability S (previously "Generic Data M")
This ISDN ordering code is the recommended IOC since it supports the most features for voice and data
applications. However, ISDN tariffs in some areas may warrant ordering codes with fewer features (e.g.,
where there is an additional monthly charge for having voice service on both B channels). If yours is a
data only application, you may find Capability R more cost-effective.
Capability S supports:
• 2B Service,
• alternating voice/data on each B channel, and
• Two directory numbers.
Applications for Capability S include:
• 115.2K or 128K bps data,
• 56K/64K bps data with voice or modem support, and
• Generic 115.2K/128K bps data transfer applications (including remote access and LAN/WAN
connectivity and telecommuting).
M5 (previously "Generic Data M-1DN")
This ISDN ordering code supports:
• 2B Service,
• alternate voice/data on each B channel, and
• One directory number.
M5 is not available for services provided with Northern Telecom or AT&T switches. Since two directory
numbers are required for 2B operation, use Capability S.
MTA128ST/NT
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Appendices
Ordering ISDN Without IOCs
This section guides you and your telephone company in specifying and obtaining ISDN service when IOCs
are not used. To support most ISDN TA features, your telephone service must meet certain requirements.
These requirements are described in the following sections. Some features may be added or deleted,
depending on your actual data service needs and availability in your area. Before ordering, talk to your
telephone company about which of the services listed on the following pages are provided in your area.
The following form was created for you to complete and fax to your telephone company to request the
proper ISDN line for use with your ISDN TA module.
Name:______________________________________________________
Address:____________________________________________________
City: _______________________________ State:_________________ZIP Code: __________
DaytimeTelephone Number:_______________
1. Request an ISDN BRI (Basic Rate Interface) line with:
• U-Interface Reference Point, and
• 2B1Q Line Coding.
2. Choose one of the following:
___ 2B+D Service (supports up to 128K bps), or
___ 1B+D Service (supports up to 64K bps).
3. Indicate the ISDN Switch Type and Software Protocol you will be using:
___ AT&T 5ESS, with:
___ Custom,
___ 5E6 and later software, or
___ NI1 (National ISDN-1).
___ Northern Telecom DMS-100, with:
___ BCS-32 and later software (Pvc1), or
___ National ISDN-1 (Pvc2).
___ Siemens EWSD with National ISDN-1
4. Request that the ISDN line you are ordering allocates one dynamic TEI (Terminal Endpoint Identifier) per
phone number.
5. Order specific services for your particular ISDN Switch:
5a. AT&T 5ESS: request a line with:
Feature: Value
B1 Service: DMD (On Demand)
B2 Service: DMD (only if 2B+D ordered)
Data Line Class: PM (Point-to-MultiPoint)
Maximum B Channels: 2 (if 2B+D) or 1 (if 1B+D)
Circuit Switched Voice (CSV) Bearer Channels: Any
CSV Calls: 1 (recommended for test purposes)
Number of Circuit Switched Data (CSD) Bearer Channels: Any
Number of CSD Calls: 2 (if 2B+D ordered), or 1 (if 1B+D ordered)
Terminal Type: Type A
MTA128ST/NT
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Appendices
Turn these features OFF:
Packet Mode Data
MultiLine Hunt
Multiple Call Appearances
EKTS (Electronic Key Telephone Sets)
Shared Directory Numbers
Accept Special Type of Number
Intercom Groups
Modem Pools (Network Resource Selector)
Message Waiting
Hunting
InterLATA Competition
5b. NorthernTelecom DMS-100: request a point-to-multipoint line with:
Line Type: Basic Rate, Functional
Electronic Key Telephone Sets (EKTS): No
Call Appearance Handling (CACH): No
Non-Initializing Terminal: No
Circuit Switched Service: Yes
Packet Switched Service: No
TEI: Dynamic
Bearer Service: Circuit Switched Voice and Data Permitted on Any B Channel (Packet Mode Data not
permitted)
6. Select a long distance carrier; note here:________________________
7. Contact the selected long distance carrier and request Circuit-Switched 64K bps Clear Channel Access
(if available).
8. Request that the telephone company provide ISDN TA configuring information (record here):
• ISDN Switch Type: ____________________
• ISDN Switch Protocol Version: ___________
• ISDN Phone Number 1: __________________
• ISDN Phone Number 2: ______________ (if 2B+D ordered)
• ISDN Line Type: ___________________ (point-to-point or multipoint)
• If MultiPoint, SPID Number 1: ______________ (with prefix and suffix)
• If MultiPoint, SPID Number 2: ______________ (with prefix and suffix)
9. If you will be using standard 5ESS or DMS-100, your protocol selection is complete. Fax the
information in steps 1-8 to your phone company. If you will be using 5ESS "Custom" or DMS-100 "Pvc1"
protocol support, continue with step 10a (5ESS Custom) or step 10b ( DMS-100 Pvc1).
10a. 5ESS Custom Line Additional Parameters
The AT&T 5ESS central office telephone switch supports a proprietary ISDN D-channel call control
protocol called "Custom" which is based on CCITT recommendations. The ISDN TA configured for switch
type AT&T 5ESS will work with lines providing this protocol on 5ESS switches with software version 5E6 or
later.
The ISDN TA supports the following configurations on 5ESS Custom lines:
• Point-to-Point with one phone number (recommended configuration with no POTS interface)
• Multipoint with one phone number
• Multipoint with two phone numbers (recommended configuration with POTS interface)
MTA128ST/NT
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Appendices
The requirements for the 5ESS line are shown below:
B1 Service: DMD (On-demand)
B2 Service: DMD (On-demand)
Data Class Line: PM (Point-to-MultiPoint)
Max. B Channels: 2
Number of CSV Calls: 2
CSV Bearer Channels: Any
Number of CSD Calls: 2
Circuit Switched: Any
Terminal Type Bearer Channels: Type A
Multipoint lines require the phone company to create a SPID for each phone number on the line. With the
exception of the ability to spread two calls across two phone numbers, multipoint lines offer no special
features, and may create complications. However, if you use a multipoint line, the parameters are similar
to the point-to-point lines, except for the SPIDs.
The 5ESS switch can provide a variety of supplementary features which the ISDN TA may not support.
Enabling these features may have undesirable consequences.
Features to avoid are:
• Packet mode data
• Multiline Hunt Groups
• EKTS (Electronic Key Telephone Set)
• Shared directory numbers
• Intercom groups
• Modem Pools (Network resource selector)
• Message waiting
• Hunting
• Inter LATA competition
• Accept special type of number
10b. DMS-100 Pvc1 Line Additional Parameters
The Northern Telecom DMS-100 telephone switch supports a proprietary ISDN D-channel call control
protocol called Protocol Version 1 ("Pvc1") which is based on CCITT recommendations. The ISDN TA
configured for switch type DMS-100 will work with lines providing this protocol on DMS-100 switches with
software version BCS-32 or later.
The ISDN TA supports the following configurations on DMS-100 Custom lines:
• Multipoint with one phone number (for 1B+D service)
• Multipoint with two phone numbers (for 2B+D service)
The requirements for the DMS-100 multipoint line are defined in Local Interface Requirements, Local
Service Requirements, and below. Fax this information to your local phone company.
The line should have two service profiles with the parameters below, to support BONDING and the POTS
port, if installed.
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Appendices
Line Type: Basic rate, functional
EKTS: No
CACH: No
Initializing terminal: Yes
Bearer services: Circuit-switched voice & data permitted (Packet mode data not permitted) Circuit-
switched service: Yes
Packet-switched service: No
Protocol version: Functional Pvc1
TEI: Dynamic
MTA128ST/NT
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Appendices
Appendix C: FCC and Canadian Regulation
FCC
1. This equipment complies with Part 68 of the Federal Communications Commission (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. As indicated below, the suitable jack (Universal Service Order Code connecting arrangement) for this
equipment is shown. If applicable, the facility interface codes (FIC) and service order codes (SOC) are
shown.
An FCC-compliant telephone cord and modular plug is provided with this equipment. This equipment is
designed to be connected to the telephone network or premises wiring using a compatible modular
jack which is Part 68 compliant. See installation instructions for details.
3. The ringer equivalence number (REN) is used to determine the quantity 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 that temporary discontinuance of service may be required. 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
equipment 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:
FCC Registration #:
Multi-Tech Systems, Inc.
MTA128NT
AU7USA-24353-DD-N
Ringer Equivalence:Modular Jack (USOC) RJ45/RJ11
Service Center in USA:
Multi-Tech Systems Inc.
2205 Woodale Drive
Mounds View, MN 55112
Voice (612) 785-3500/
FAX (612) 785-9874
MTA128ST/NT
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Appendices
Canadian Limitations Notice
Notice: The ringer equivalence number (REN) assigned to each terminal device provides an indication of
the
maximum number of terminals allowed to be connected to a telephone interface.The termination of a
interface may consist of any combination of devices subject only to the requirement that the sum of the
ringer equivalence numbers of all the devices does not exceed 5.
Notice: The Industry Canada label identifies certificated equipment.This certification means that the
equipment meets certain telecommunications network protective, operational and safety requirements.The
Industry Canada 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.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 maintenance 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 ensure 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 CE mark is affixed to this product to confirm compliance with the following European Community
Directives:
Council Directive 89/336/EEC of 3 May 1989 on the approximation of the laws of Member States relating to
electromagnetic compatibility;
and
Council Directive 73/23/EEC of 19 February 1973 on the harmonization of the laws of Member States
relating to electrical equipment designed for use within certain voltage limits;
and
Council Directive 98/13/EC of 12 March 1998 on the approximation of the laws of the Member States
concerning telecommunications terminal and satellite earth station equipment.
MTA128ST/NT
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Appendices
Appendix D: Configuration Methods
Firmware-based Configuration Utility
1. If you are using another operating system, turn on your computer and start your data
communications program.
2. The TR (Terminal Ready) LED lights to indicate that your computer is ready to communicate with the TA.
Type AT in the communications program’s terminal window and press ENTER. The TA should respond
with OK.
If it doesn’t, go to Chapter 5 for troubleshooting help.
3. To view your current configuration, type AT!L in the terminal window. Switch Type and Data Protocol
information appear. The fields for SPIDs (Service Provider Identification) and for Voice and Data
Directory Numbers will be empty. Your TA ships with Auto-TEI (terminal endpoint identifier) as its default.
Refer to before you start in Chapter 3 for your network, call control configuration, and comport settings.
4. To change one or more settings, type AT@CONFIG, press ENTER, and follow the ConfigMenu
directions.
5. Type AT&W and press ENTER to store your settings.
The following is a description of the menus.
Network Configuration Menu. Select this menu to configure network parameters such as the switch type,
data and voice TEIs, and datea nd voice MSNs. When you finish, select Save Hetwork Configuration to save
your work.
Call Control Configuration Menu. Select this menu to change how the MTA128ST/NT originates and
answers calls. Options include Auto Answer, Rings to Answer, Dialing Method, and Persistent DTR Dialing.
Data Protocols Menu. Select this menu to change the rate adaption protocol used by the MTA128ST/NT.
Stored Numbers Menu. Select this menu to store up to ten phone numbers with a maximum of 25 characters
each. Stored number 0 is the phone number that is dialed if you enable persistent DTR dialing.
Port Control Configuration Menu. Select this menu to configure the MTA128ST/NT’s serial port, including
how the MTA128ST/NT responds to control signals on the RS232 interface.
POTS Port Configuration Menu. Select this menu to configure the MTA128ST/NT’s POTS port which
includes the ring type, frequency, and pattern.
Help Menu. Select this menu for help on navigating through the MTA128ST/NT menu system.
Configuration via AT Commands
You can configure the MTA128ST/NT by using AT commands, just as you would configure an analog modem.
Use this method if you prefer to work with AT commands or if you have a special requirement not
addressed by either of the configuration utilities.
Using AT Commands to Configure the MTA128ST/NT
1. Connect a VT100/ANSI-compatible terminal, or a computer that has a communications program that has
VT100/ANSI terminal emulation, to the MTA128ST/NT’s serial port.
2. Turn on the MTA128ST/NT. The MTA128ST/NT automatically detects whether an ASCII or ANSI
terminal is in use and adjusts accordingly.
3. Start a data communication program and select the COM port where the MTA128ST/NT is connected.
4. Referring to your Before Your Start notes, enter the desired AT commands in the terminal window of the
data communications program.
5. When you finish making changes, use the &W command to save your new configuration, and to select it
to automatically load when the MTA128ST/NT is turned on.
6. Quit the data communications program.
For more information on AT commands, see the MTA128ST and MTA128NT AT Commands documents
MTA128ST/NT
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Glossary
speed you need in any situation. Allows you to automatically add
and drop b-channels according to your preference; you pay only for
the bandwith you need.
Glossary
basic access—A term that describes a simple standardized combina-
tion of access channels that constitute the access arrangements for
most ISDN users.
Symbol
2B1Q (2 bits, 1 quarternary)—A line code at layer one for the BRI
U interface. Two bits of data (2B) are mapped into one of four line
values (1Q, or 1quarternary). This coding scheme
B-channel (bearer channel)—A 64 Kbps ISDN channel used for
digital high-speed data or voice transmission. Simultaneous voice
and data transmission requires subscription to two B-channels. A
voice call can be placed or received while a data call is in process
allows a single copper pair to carry 160 Kbps of information
bidirectionally and simultaneously at a distance of up to three miles. (or vice versa); however, two simultaneous voice or two simulta-
neous data calls are not supported.
A
bearer capability (BC)—The level of functionality provided by the
ISDN B-channel (e.g., data, 3.1 KHz audio, etc.).
ACK (acknowledgement code)—A communications code sent from
a receiving modem to a transmitting modem to indicate that it is
bearer services—A set of ISDN functions provided by the B-
ready to accept data. It is also used to acknowledge the error-free
channel, such as digital telephony, toll-free inbound/outbound calls,
receipt of transmitted data. Contrast with NAK.
64 Kbps circuit switched data, X.25 packet switched data, and frame
relay data.
address—A numbered location inside a computer. The computer
uses addresses to access resources such as video cards, serial ports,
bit—A bit (binary digit) is a basic unit of information used in
memory, etc.
computing and other digital electronics. It can take a value of either
1 or 0, represented in a computer by a high or low electrical charge.
analog signal—A waveform that has amplitude, frequency, and
phase, which takes on a range of values between its maximum and
BONDING (Bandwidth on Demand Interoperability Group)—An
minimum points.
inverse multiplexing method that combines multiple ISDN channels
into a single channel for enhanced throughput. Trademark of the
analog transmission—A type of telecommunications that uses an
analog signal as a carrier of voice, data, video, etc. An analog signal
BONDING Consortium.
becomes a carrier when it is modulated by altering its phase, ampli-
BONDING mode 1—An industry-standard ISDN B channel aggre-
tude, and/or frequency to correspond with the source signal. Com-
gation protocol that was developed by the Bandwidth On Demand
pare with digital transmission.
Interoperability Group. This mode supports user data rates that are
multiples of the bearer rate. It provides the full available bandwidth,
API (application program interface)—A software module created
to allow dissimilar, or incompatible applications programs to trans-
but no in-band monitoring. Mode 1 is common to all implementa-
fer information over a communications link. APIs may be simple or
tions of BONDING; Modes 0, 2, and 3 are optional.
complex; they are commonly required to link computer applications
BONDING Consortium—A group that develops specifications for
with mainframe programs.
common control and synchronization for management of high-speed
data over the public network.
ASCII (American Standard Code for Information Interchange)—
Pronounced ass-key. A binary code for data that is used in communi-
BONDING Specification 1.0— The Version 1.0 BONDING
cations and in many computers and terminals. The code is used to
specification (August 1992) defines four modes of inverse multi-
represent numbers, letters, punctuation, and control characters. The
plexing interoperability. It allows devices from various manufactur-
basic ASCII code is a 7-bit character set, which defines 128 possible
ers to subdivide a wideband signal into 64 Kbps or 56 Kbps
characters. The extended 8-bit ASCII code defines 255 characters.
channels, and then pass the individual channels over a switched
ASI (application services interface)—A software module that creates
digital network, recombining them into a single high-speed signal at
the interface between a LAN-connected PC and the network operat-
the receiving device.
ing system. ASIs packetize computer data for transport over the
BONDING Specification 1.1— The Version 1.1 BONDING
network. NASI, NCSI, MCSI and NETCI are specific examples.
specification (September 1993) incorporates changes to the 1.0
AT commands—A standard set of commands used to control
specification resulting from interworking tests among various
vendors, and comments from the TIA standardization process. No
changes were made to the BONDING algorithm or procedures.
modems. Each AT command string begins with the characters AT,
which get the attention of the modem before the actual command is
issued. See also command mode.
bps (bits per second)—The unit of 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.
B
background—An activity that takes place in the computer while
you are running another application. In other words, the active user
interface does not correspond to the background task.
BRI (basic rate interface)—Also called 2B+D. One of two forms of
ISDN service. BRI provides two 64 Kbps B-channels for video,
voice or data, and one 16 Kbps D-channel for control information.
The total BRI data rate is 192 Kbps, with 144 Kbps available to the
user. See also ISDN and PRI.
bandwidth—The transmission capacity of a computer channel,
communications line or bus. It is expressed in cycles per second
(hertz), the bandwidth being the difference between the lowest and
highest frequencies transmitted. The range of usable frequencies that
a transmission medium will pass without unacceptable attenuation or
distortion. Bandwidth is a factor in determining the amount of
information and the speed at which a medium can transmit data or
other information.
buffer—A temporary storage register or random access memory
(RAM), used in all aspects of data communications, that prevents
data from being lost due to differences in transmission speed.
Keyboards, serial ports, muxes and printers are a few examples of
devices that contain buffers.
Bandwidth-on-Demand—Ability to request the amount of data
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Glossary
bus—A common channel between hardware devices, either inter-
nally between components in a computer, or externally between
stations in a communications network.
office.
D-channel—A non-ransparent digital ISDN channel that operates at
16K or
byte—A unit of information consisting of eight binary digits (bits).
A byte holds the equivalent of a single or character (such as the
letter A).
64 Kbps, used for call control signalling, along with one or more B-
channels. The D (demand) channel signal can control call setup, call
teardown, and invocation of Supplementary Services. Is also used
for telemetry and for low-speed, low-priority packet-switched data.
Contrast with B-channel.
C
Call Bumping—TA feature that reallocates the second B-channel to
an analog port when both B-channels are in use. If you are perform-
ing a data transfer using both channels and need to make a phone
call, one channel is dropped to handle the call and then is reestab-
lished after it is completed. With call bumping you don’t miss any
calls.
default—A preset value or option in software packages or in hard-
ware configuration that is used unless you specify otherwise.
device driver—Software that controls how a computer communi-
cates with a device, such as a printer or mouse.
digital data—Information represented by descrete values or condi-
tions (contrast analog data).
call setup time—The time to establish a circuit-switched call
between two points. Includes dialing, wait time, and central office–
long distance service movement time.
digital PBX—A private branch exchange that operates internally on
digital signals. See also exchange.
digital signal— A discrete or discontinuous signal (e.g., a sequence
of voltage pulses). Digital devices, such as as a series of electrical
pulses that have discrete jumps rather than gradual changes.
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.
digital transmission—A method of electronic information transmis-
sion common among computers and other digital devices. Because a
digital signal may be only high or low at any given time, noise and
distortion can easily be removed from digital transmissions.
Centrex—A multi-line service, offered by telephone companies,
that provides functions and features comparable to those of a PBX
for large business users. See also PBX, exchange.
digitize—To convert an analog signal to a digital signal.
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 printed circuit board.
channel—A data communications path between two computer
devices. It can refer to a physical medium (e.g., UTP or coax), or to
a specific carrier frequency. In ISDN, two types of channels are
specified: transparent (user can define the service), and
nontransparent (service is assigned protocols for specific network
functions). ISDN channel names are designated by a single letter,
from A through M, sometimes combined with a number (see B-
channel and D-channel).
DN (directory number)—The phone number assigned to an ISDN
TA at subscription time. It is a string of up to 24 characters, consist-
ing of the valid dialing characters (0-9, *, and #).
driver—A software module that interfaces between the operating
system and a specific hardware device (e.g., color monitors, printers,
hard disks, etc.). Also known as a device driver.
CHAP(Challenge Handshake Authentication Protocol)—Security
method used to verify the identity of a person or process.
DTE (data terminating equipment)—A term used to include any
device in a network which generates, stores or displays user infor-
mation. DTE is a telecommunications term that usually refers to
PCs, terminals, printers, etc.
CHAP MD5—Chap with MD5 digital signature algorithm imple-
mented.
circuit-switched network—A technology used by the PSTN that
allocates a pair of conductors for the exclusive use of one communi-
cation path. Circuit switching allows multiple conversations on one
talk path only if end users multiplex signals prior to transmission.
DTMF (dual-tone multifrequency)—A generic push-button concept
made popular by AT&T TouchTone.
DTMF detection—A capability in some fax/data modems that can
differentiate between DTMF or fax calling tones. A typical applica-
tion would be a program that routes calls to specific communica-
tions applications, depending either on the type of call or on a
DTMF tone added to a dialing string.
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.
CO (central office)—The lowest, most basic, level of switching in
the PSTN (public switched telephone network). A business PABX or
any residential telephone connects to the PSTN at a central office.
E
EEPROM (Electrically Eraseable Programmable Read-only
Memory)—Upgradable memory chip often used to store firmware.
COM port—A serial communications port on a personal computer.
EISA (Enhanced Industry Standard Architecture)—Pronounced
eesa. The purpose of the EISA bus is to provide a 32-bit bus for
faster throughputs while maintaining backward compatibility with
the classic ISA bus architecture.
Normally, there are two: COM1 and COM2.
CPE (customer premise equipment)—The generic term for data
communications and/or terminal equipment that resides at the user
site and is owned by the user (e.g., not telephone company equip-
ment).
ET (exchange termination)—The carrier’s local exchange switch.
Contrast with LT (loop termination).
D
exchange—A unit (public or private) that can consist of one or more
central offices established to serve a specified area. An exchange
typically has a single rate of charges (tariffs) that has previously
DCE (data communications equipment)—Any device that serves as
the port of entry from the user equipment to a telecommunications
facility. A modem is a DCE for the telephone network (PSTN) that is
commonly on site at the user’s premises. Packet Switched Networks
have another level of DCE that is most often located at a central
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Glossary
university, government, and private users around the world.
been approved by a regulatory group.
exchange area—A geographical area with a uniform set of charges
(tariffs), approved by a regulatory group for telephone services.
Calls between any two points within an exchange area are local
calls. See digital PBX and PBX.
Internet address—A unique 32-bit address for a specific TCP/IP
host on a network. Normally printed in dotted decimal format (e.g.,
129.128.44.227).
I/O address—A location within the I/O address space of your
computer used by a device, such as an expansion card, a serial port,
or an internal modem. The address is used for communication
between software and a device.
F
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 bit-mapped approximation of a graphical
document and, therefore, cannot be accurately interpreted according
to any character code.
IP address—A unique 32-bit address for a specific TCP/IP host on a
network. Normally printed in dotted decimal format (e.g.,
129.128.44.227).
IRQ (interrupt request)—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 that IRQs can be prioritized.
firmware—Software that is stored in read-only memory (ROM).
Unlike random access memory (RAM), ROM can retain its content
without electrical power. Some ROM, known as EEPROM, can be
reprogrammed electrically while it is in a device.
ISA (Industry Standards Architecture)—Pronounced ice-a. The
classic 8- or 16-bit architecture introduced with IBM’s PC-AT
computer. Due to speed constraints, IBM later introduced a restruc-
tured Micro Channel Architecture with a 32-bit bus and increased
addressing capabilities.
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.
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
(e.g., long wavelength signals have low frequencies and short
wavelength signals yield high frequencies).
ISDN (Integrated Services Digital Network)—International telecom-
munications standard for transmitting voice, video and data over a
digital communications line.
ITU-T (formerly CCITT)—International Telecommunications
Union–Telecommunications Sector; the United Nations organization
that prepares standards for resolving communications issues and
problems.
H
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 accom-
plished by the exchange of predefined, mutually recognized control
codes.
L
LAPB (Link Access Procedure Balanced)—Based on the X.25
Layer 2 specification. A full-duplex, point-to-point, bit-synchronous
protocol commonly used as a data link control protocol to interface
X.25 DTEs. LAPB is the link initialization procedure that estab-
lishes and maintains communications between the DTE and the
DCE.
HDLC (High-Level Data Link Control)—An ISO standard, bit-
oriented data communications protocol that provides nearly error-
free data transfers.
hexadecimal—A base 16 numbering system in which one character
represents a four-bit binary value. Hexadecimal notation uses the
numbers 0–9 and the letters A–F, usually suffixed by an h (e.g., 4CF
h).
LAPD (Link Access Protocol for the
D-Channel)—Based on the ISDN Q.921 specification. A full-duplex
point-to-point bit-synchronous link-level protocol for ISDN connec-
tions; different from LAPB in its framing sequence. Transmission is
in units called frames, and a frame may contain one or more X.25
packets.
I
IDN (Integrated Digital Network)—The culmination of transmission
and switching functions using digital technology in a circuit-
switched telecommunications network.
link optimization—An ISDN feature that permits only user data to
open the communications link and keeps administrative packets
from opening the link. A cost saving feature that ensures that remote
connections are not unnecessarily utilized.
IEC (Inter-Exchange Carrier)—A telephone company that is al-
lowed to provide long distance telephone service between LATAs,
but not within any one LATA. Also called IXC.
local loop—A transmission path, typically twisted-pair wire, be-
tween an individual subscriber and the nearest public telecommuni-
cations network switching center. Also called the subscriber loop.
IETF(Internet Engineering Task Force)—
A self-organized group of people who make technical and other
contributions to the engineering and evolution of the Internet and its
technologies. It is the principal body engaged in the development of
new Internet standard specifications.
LT (loop termination)—A device, similar to an NT1, that terminates
the local loop at the carrier’s central switching office. The LT
provides the interface to the ISDN U reference point. Contrast ET
(exchange termination).
I-mux (inverse multiplexer)—A device that will dial up and com-
bine several lower speed circuits into a virtual broadband circuit. It
takes any multiple up to an aggregate bandwidth, giving users
bandwidth on demand for videoconferencing, LAN-to-LAN connec-
tions, etc. In ISDN devices, inverse multiplexing is performed by the
BONDING protocol.
M
MD5(MD5 Message-Digest Algorithm)—Takes a message if
arbitrary length as input and produces it as output as a 128-bit
fingerprint or message digest of the input. The MD5 algorithm is
used for digital signature applications where a large file must be
in-band signaling—A technique in which connection control
information is sent over the same channel as assigned to the sub-
scriber for end-to-end communication. Two common examples are
DTMF line signaling and MF trunk signaling.
Internet—A computer network consisting of many millions of
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Glossary
OSI Layer 1 level. Similar in function to a DSU/CSU device.
compressed in a secure manner before being encrypted with a
private (secret) key under public-key cryptisystem.
NT2 (Network TerminationType 2)—A device at the customer
premise (user) side responsible for the ISDN network connection
and for functions such as multiplexing and switching (may be an
intelligent device).
MLPPP (Multilink Point-to-Point Protocol, also the PPP Multilink
Protocol or MP)—is an Internet standards track protocol for a
methyod of splittingm recombining, and sequencing datagrams
across multiple logical data links, giving you additional bandwith-
on-demand. Originally, MLPPP was used to combine two ISDN BRI
channels into a single high-speed data path, but now is also used
anywhere multiple PPP links connect two systems, including async
links. This is done with new PPP options and protocols. Also knows
as MPPP and PPP Multilink, MLPPP is an effective means of
bonding channels for providing bandwith-on-demand.
NTE (network terminating equipment)—A set of ISDN functions
residing at the boundary of the IDN and the subscriber.
NUI (network user identification)—A unique alphanumeric number
provided to dial-up users to identify them to packet-switched net-
works world-wide. The number is used for network access and
billing.
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 tele-
phone 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.
O
off-hook—The condition of a device that 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-demand dialing—A cost-saving feature of ISDN that sets up,
transfers, and then closes a call only when the ISDN device detects a
data packet addressed to the remote network, but will not perform
setup/transfers of just administrative (non-user data) packets.
MP+(MultiLink Protocol Plus)—An extension to the PPP Multilink
Protocol (MP) convered in IETF RFC 1717. MP+ is a new control
protocol for managing multiple data links that are bundled by MP.
Also called the Multichannel Protocol Plus or MPP.
out-of-band signaling—A system that uses a separate communica-
tions channel or frequency outside the voice band for signaling.
Modern systems use a separate channel, either TDM or virtual. SS7
uses messages for signaling that are carried on signaling links
distinct from voice channels. ISDN uses messages for signaling that
are carried on the
D-channel distinct from the voice carried on the B-channels. Frame
Relay and ATM use messages that are carried on a separate virtual
connection reserved for signaling.
MS-CHAP—Microsoft version of CHAP.
multilink—In point-to-point protocol, literally many links. A
procedure used to route data packets over many links for increased
bandwidth (e.g., two B-channels on a single BRI for 128 Kbps).
mux (multiplexer)—A device that merges several signals into one
composite signal for transmission over a single medium or channel.
A demultiplexer, built into most muxes, reverses the process at the
receiving end.
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 incom-
ing call.
N
nailed connection—A permanent or dedicated circuit of a previ-
ously switched circuit or circuits.
nailed-up circuit—A semi-permanent circuit established through a
P
circuit-switching facility for point-to-point connectivity.
packet data—Packet-mode calls.
NAK (negative acknowledgment)—A communications code used to
indicate that a message was not properly received, or that a terminal
does not wish to transmit. Contrast with ACK.
packet mode—The switching of chunks of information for different
users using statistical multiplexing to send them over the same
transmission facility. ISDN packet mode capabilities are based on
the ITU-TSS Recommendation X.25 procedures.
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.
PAP(Password Authentication Protocol): (RFC1334)
NI-1 (National ISDN-1)—A physical standard to make all compliant
ISDN lines appear the same. With ISDN-1 installed, additional costs
are not incurred when changing from prestandard ISDN to standard
ISDN. Most RBOCs now are moving to ISDN-1.
parity bit—An extra bit attached to each byte of sync—hronous
data used to detect errors in transmission.
PBX (private branch exchange)—A telephone exchange located on
the customer’s premises. The PBX provides a circuit switching
facility for tlephone extension lines within the building, and access
to the public telephone network. See also exchange.
NI-2 (National ISDN-2)—A physical standard subsequent to NI1.
When tested and deployed, NI-2 will provide additional features and
enhanced plug and play capabilities.
P-channel (PCHAN)—The ISDN physical channel identification;
node—Any point within a network that has been assigned an
contrast logical channel or virtual channel.
address.
PDN (public data network)—A packet-switched network that is
available to the public for individual (subscriber) use. Typically,
controlled by a government or a national monopoly.
NT (network termination)—Devices that form the boundary be-
tween customer premise equipment and telephone company equip-
ment. Two types of NTs are used: NT1 and NT2.
port—A location for input or output data exchange. Computers,
NT1 (Network TerminationType 1)—An interface device used in the
BRI portion of ISDN to connect four-wire (S/T) ISDN devices to
the two-wire (2BIQ U) IDN. It provides basic rate access in a 2B+D
format with two 64 bps channels for voice, data, and video commu-
nications. It also provides one 16 Kbps channel for packet-mode
signalling, low-speed data and telecommunications services at the
muxes, etc. have ports for various purposes.
PPP (Point to Point Protocol)—A protocol that lets a computer user
access a TCP/IP address using an ISDN terminal adapter or a high-
speed modem over a standard telephone line.
PRI (Primary Rate Interface)—One
of two forms of ISDN service. PRI provides 23 64 Kbps B-channels
for video, voice or data, and one 64 Kbps D-channel for control
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Glossary
services. Also called the S-interface. (Contrast R-reference point.)
information. Usually used to connect high-cpacity CPE, such as
PBXs, to the network. Also called 23B+D in the U.S. and 30B+D in
Europe.) See also ISDN and BRI.
SAP (service access point)—A point at which the services of an OSI
layer are made available to the next higher layer. See also SAPI.
primitive—An abstract representation of interaction accross the
access points indicating that information is being passed between the
service user and the service provider. The OSI Reference Model
defines four types of primitives: Request, Indication, Response and
Confirm.
SAPI (service access point identifier)—A logical point at which data
link layer services are provided by a data link layer entity to a layer
3 entity. See also SAP.
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 connec-
tor that sends data in sequence (bit by bit). Serial ports are referred
to as COMx ports, where x is 1 to 4 (e.g., COM1 through COM4). A
serial port contains a conversion chip called a UART that translates
between internal parallel and external serial formats.
PSTN (public switched telephone network)—The group of circuit-
switching voice carriers, which are commonly used as analog data
communications services. 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
service—The requirements offered by an RPOA to its customers to
associated with rotary-dial phones. Compare with tone dialing.
satisfy specific telecommunications needs.
PVC (permanent virtual circuit)—A connection between two
endpoints dedicated to a single user. In ISDN, PVCs are established
by network administration and are held for as long as the user
subscribes to the service.
signaling—The process of establishing, maintaining, accounting for,
and terminating a connection between two endpoints (e.g., the user
premises and the telco CO). Central office signals to the user pre-
mises can include ringing, dial tone, speech signals, etc. Signals
from the user’s telephone can include off-hook, dialing, speech to
far-end party, and on-hook signals.
Q
Q.921—The ITU-T recommendation for user-network interface
layer 2 specifications for D-channel signaling. Similar to LAPD. See
also ISDN.
In-band signaling techniques include pulse and tone dialing. With
common channel signaling, information is carried out-of-band. In
ISDN, signaling includes the call establishment, call progress
monitoring, call termination and enhanced telephone features
provided typically by the D-Channel. See also SS7, out-of-band
signaling, and in-band signaling.
Q.931—The ITU-T recommendation for user-network interface
layer 3 specifications for D-channel signalling. See also ISDN.
R
SPID (service profile identifier)—In North America, the ISDN
network parameter for logical terminal identification and tracking,
provided by the ISDN provider. The voice SPID and data SPID
identify a particular set of service or feature parameters. They are
assigned by the ISDN service provider, in the form of a string of up
to 20 characters, at subscription time. The SPID actually points to a
specific location in central office memory where the relevant
informartion is stored.
R reference point—Establishes the boundary between non-ISDN
compatible equipment (TE-2) and the IDN network. TAs are used to
convert the communication protocol used by the non-ISDN
termnials to the desired BRI or PRI protocol. Non-ISDN (TE2)
terminal equipment connects to IDN at the R-Reference point with a
TA. (This interface may follow the RS232 or V.35 specification.)
Also called the R interface. (Contrast S reference point.)
RAM (random access memory)—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.
SS7 (Signaling System 7)—An ITU-T and ANSI standard for digital
out-of-band signalling between central offices that provides much of
the network switching intelligence to support many ISDN functions
stop bit—One of the variables used for timing in asynchronous data
transmission. Depending on the devices, each character may be
trailed by 1, 1.5, or 2 stop bits.
reference point—A connection point between ISDN equipment
classes (rather than the specific protocol of the interconnection). Can
include R, S, T, and U reference points.
subscriber loop—The pair of wires that connect the end user to the
telephone network. These wires provide ISDN service, but also
require an NT1 at the enduser location as well as the LT at the
network end. See also local loop.
RFC(Request for Comments)—Name for the IETF document that
provides internet standards.
RJ-11—An industry standard interface used for connecting a
telephone to a modular wall outlet; comes in 4-and 6-wire packages.
supplementary services (SS)—ISDN functions beyond the basic
requirements; includes videoconferencing, fast dialing, call waiting,
call forwarding, calling line ID.
RJ-45—An 8-wire modular connector for voice and data circuits.
RPOA (recognized private operating agency)—A corporation,
private or government-controlled, that provides telecommunications
services. RPOAs, such as AT&T, participate as non-voting members
in the ITU-T.
SVC (switched virtual circuit)—A type of data transmission where
the connection is maintained only until the call is cleared.
SVD (simultaneous voice and data)—A technology for letting a user
send data via a modem, and use a handset to talk to another user at
the same time over the same connection. The alternative, making a
second call, can be expensive or even impossible. The uses for SVD
are telecommuting, videoconferencing, distant learning, tech sup-
port, etc.
RS-232—An EIA/TIA 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. Similar to the ITU-T V.24 standard.
switched 56—A circuit-switched (full duplex digital synchronous
data transmission) service that lets you dial a number and transmit
S
S reference point—Provides the connection between NT2 equip-
ment and the TA or TE-1. Can provide both primary and basic rate
MTA128ST/NT
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Glossary
data to it at 56 Kbps. It is a relatively low cost service, widely used
in North America for telecommuting, videoconferencing and high
speed data transfers. Many phone companies are phasing out
switched 56 in favor of ISDN service.
associated with Touch-Tone® (push button) phones. Compare with
pulse dialing.
TSR (terminate and stay resident)—A software program that re-
mains active and in memory after its user interface is closed. Similar
to a daemon in UNIX environments.
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.
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.
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 com-
mon method of transmission between computers on a network or
between modems. One or more synchronous characters are transmit-
ted to confirm clocking before each packet of data is transmitted.
Compare to Asynchronous Transmission.
U
U reference point—A twisted-pair subscriber loop that connects the
LT to the NT1. Normally a 2-wire BRI or PRI line is used, but a 4-
wire BRI can also be used. In the US, the U Reference Point marks
the separation point between CPE and the network.
UART (universal asynchronous receiver/transmitter)—An inte-
grated circuit that transmits and receives data on the serial port. It
converts parallel bytes into serial bytes for transmission, and vice
versa, and generates and strips the start and stop bits appended to
each character.
T
T—Provides the connection between the NT1 and NT2. Can be
internal to or external from the PABX. Provides the connection
between the NT1 equipment and the TA or TE-1. Can provide both
Primary Rate and Basic Rate services.
UTP (unshielded twisted pair) —Telephone-type wiring.
TA—See terminal adapter.
V
TCP/IP (Transmission Control Protocol / Internet Protocol)—A
multi-layer set of protocols developed by the US Department of
Defense to link dissimilar computers across dissimilar and unreliable
LANs.
V.110—One of the terminal rate adaptation protocols for the ISDN
B-channel. V.110 is more hardware-intensive than the V.120 B-
channel standard.
V.120—One of the terminal rate adaptation protocols for the ISDN
B-channel. V.120 is more software-intensive than the V.110 B-
channel standard.
TEI (terminal endpoint identifier)—A unique number that is as-
signed to an ISDN terminal adapter at subscription time. The TEI is
used by the central office to identify the various TAs connected to
the ISDN network. The TEI number can be fixed (in the range 0f 0-
63, or dynamic, automatically assigned at the CO each time the TA
is connected to the ISDN interface and powered up.
Videotex—A two-way information-retrieval service that can be
accessed by terminals and by a TV set (with installed decoder).
Allows interactive retrieval of information pages from a central
resource. See also ISDN.
TE1 (Terminal Equipment Type 1)—A terminal device with a
standard ISDN interface (an ISDN-compatible terminal).
virtual circuit—A logical connection. Used in packet switching
wherin a logical connection is established between two devices at
the start of transmission. All information packets follow the same
route and arrive in sequence (but do not necessarily carry a complete
address).
TE2 (Terminal Equipment Type 2)—A terminal device with a non-
ISDN interface, such as RS232, RS449, V.35 or X.21. Can be a
telephone, data terminal, or voice/data worrkstation, etc.
telecommunication service—A function, such as bearer service and
teleservice, offered by an RPOA to its customer in order to satisfy a
specific telecommunications requirement. See also ISDN, RPOA,
and bearer service.
X
X.25—ITU-T’s definition of a three-level packet-switching protocol
to be used between packet-mode DTEs and network DCEs. X.25
corresponds with layer 3 of the 7-layer OSI model.
telematics—User-oriented ISDN information transfer services (e.g.,
X.75—An ITU-T standard for linking X.25 packet-switched net-
works. X.75 defines the connection between public networks, i.e.,
for a gateway between X.25 networks.
teletex, videotex, facsimile).
Teleservices—A telecommunications service that provides the
complete capability for communication between subscribers accord-
ing to protocols agreed to by RPOAs. A set of ISDN features using
communications links, including E-Mail and fax services.
Teletext—A telecommunications service that provides a one-way
information retrieval service that uses unused portions of a TV
channel bandwidth. A fixed number of text pages are repetitively
broadcast for decoding by a decoder at the TV set that can select and
display pages. See also ISDN.
terminal—The screen and keyboard device used in a mainframe
environment for interactive data entry. Terminals have no box, which
is to say they have no file storage or processing capabilities.
terminal adapter (TA)—An ISDN DTE device for connecting a
non-ISDN terminal device to the ISDN network. Similar to a
protocol converter or an interface converter, a TA connects a non-
ISDN device between the R and S interfaces.
tone dialing—One of two methods of dialing a telephone, usually
MTA128ST/NT
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Index
canceling a call 32
CE mark 57
COM port 36
Index
settings 15
A
COMM.DRV 39
command mode 31
commands
answering a call
manually 33
Appendix A:Configuration Profiles 48
Appendix C: Ordering Your ISDN Line 49
ISDN, ordering 49
answer 33
Dial 32
hang up 33
List Telephone Numbers 33
Load Profile 48
Store Active Profile 48
switch type 13
communications programs 36
compatibility
switch 10
ConfigMenu 13
configuration
Appendix D: FCC and Canadian Regulation 56
FCC
Canadian Regulation 56
Appendix E: Configuration Methods
Configuration Methods 58
async data format 10
AT commands
!C0= 13
&F 48
AT commands 13
Before You Start 13
Dial-Up Networking (DUN) 13
Windows 95 13
with ConfigMenu 13
with ISDN TA Configuration utility 13
Configuration Profiles 48
configuration profiles 48
configuration utilities
Windows 95 11
connecting the modem 11
connections
&W 48
&Zn= 32
&Zn? 33
+++AT<cr> 32
A
D
H
L
33
32
33
33
lack of response to 36
O
V
32
31
AT commmands
using to configure the TA 13
autoanswer 33, 38
computer 48
Connectors
ISDN 38
connectors 10
B
B-channel
protocol 10
Bandwidth on Demand 42
baud rate 15
Bearer Service 50
bit rate 15
D
data bits 15
data mode 32
data protocol
MLPPP 15
V.120 14
X.75 15
data rates 10
C
cables
data terminal ready (DTR) 14
Dial-Up Networking 13
Dialing a Stored Telephone Number 32
dimensions 10
directory number (DN) 14
Displaying a stored number 33
DN (directory number) 14
DTR (Data Terminal Ready) 14
Dynamic Bandwidth Allocation 41
ISDN 38
serial 36
Call Bumping 43
call control configuration 14
auto answer data calls 14
baud rate 15
bit rate 15
COM port settings 15
CTS control 16
data bits 15
E
data protocol 14
DCD control 16
DCD drop time 15
dialing method 14
dialing number 15
dialing stored numbers 15
DSR control 16
DTR control 16
DTR detect time 15
flow control 15
parity 15
EMC, Safety, and Terminal Directive Complianace 57
environmental conditions 10
escape sequences 32
F
factory profiles 48
FCC, Canadian Regulation 56
features
4
flow control 39
front panel 36
persistent DTR dialing 14
rings to answer 14
stop bits 15
stored numbers 15
synchronous mode 16
I
initialization strings 37
installation and setup 11
IRQ conflicts 37
ISDN BRI Line
5
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Index
ISDN line 37
ISDN, ordering 49
S
S-registers
S0 33, 38
safety 11
serial port 10, 32, 36, 37, 39
service profile idenfiier (SPID) 14
setup 48
specifications
technical
speed
ISDN Solutions Group 50
ISDN TA Configuration utility 13
L
LED Indicators
Link Status
LED indicators 10, 36
128 Kbps
8
9
8
Bearer Channel 1
Bearer Channel 2
8
8
serial port 32
SPID (service profile identifier) 14
stop bits 15
Data Protocol
Link Status
8
8
storing
Off Hook
8
telephone number 32
support, technical 47
switch type 10
Receive Data
Terminal Ready
Transmit Data
8
8
8
Loop Qualification 49
T
M
technical support 47
TEI 13
terminal endpoint identifier (TEI) 13
terminal mode 36
testing 36
manual organization
messages
9
response 31
ML-PPP protocol 15, 48
dialing 32
MLPPP connections 41
MSD.EXE 37
MSN (multiple subscriber number) 14
MultiExpress terminal 36
multiple subscriber number (MSN) 14
U
UART 39
16550 39
Using ISDN Ordering Codes (IOCs) 50
V
N
V.110 protocol 48
V.120 protocol 14, 48
voice
network configuration
data MSN 14
data TEI 13
coding 10
DNs 14
network switch 13
SPIDs 14
voice MSN 14
voice TEI 13
W
warranty 10
weight 10
Windows 3.1 39
networkconfiguration 13
X
NT1 Connection
5
X.75 protocol 15, 48
O
online command mode 32
Ordering Codes (IOCs) 50
Ordering ISDN Without IOCs 52
ordering replacement parts 46
P
parity 15
power
consumption 10
requirements 10
strip 36
supply 36
PPP connections 41
PPP software applications 41
profiles 48
R
registering your product 45
remote node operation 13
replacement parts 46
result codes 37
Returned Materials Authorization 45
rings to answer option 14
MTA128ST/NT
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