Eicon Networks Network Card DIVA T A ISDN Modem User Manual

DIVA T/A ISDN Modem  
Reference Guide  
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Contents  
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What is ISDN?  
While you've heard of ISDN, there's a good chance you're unsure whether you need it - or  
even what, exactly, it is. Even though ISDN is globally available, it's so new that  
understanding it may require a little investigation.  
In simple terms, ISDN is a replacement for plain old telephone service, which was never  
designed to meet the needs of the information age. ISDN uses the same wiring that currently  
serves homes and businesses. You get ISDN service from the same companies who provide  
telephone service, and you use it to connect telephones, computers, and fax machines. The  
difference is that you get much faster, much more dependable connections for voice, data,  
fax, and even video - all through a single line.  
International ISDN standards were established about 10 years ago. Since then, telephone  
companies throughout the world have raced to upgrade their equipment to ISDN standards.  
As ISDN service availability has spread, many millions of computer users have turned to ISDN,  
and new users are coming on board even faster.  
ISDN stands for Integrated Services Digital Network  
“Integrated Services” refers to ISDN’s ability to deliver two simultaneous connections, in any  
combination of data, voice, video, and fax, over a single line. Multiple devices can be  
attached to the line, and used as needed. That means an ISDN line can take care of most  
people's complete communications needs, without forcing the purchase of multiple analog  
phone lines at a much higher transmission rate.  
The “Digital” in ISDN refers to its purely digital transmission, as opposed to the analog  
transmission of plain old telephone service. If you're using a modem for Internet access at  
this moment, your Internet service provider's modem has converted this site's digital content  
to analog signals before sending it to you, and your modem converts those signals back to  
digital when receiving (the same thing happens with every keystroke and mouse click you  
transmit). When you connect with ISDN, there is no analog conversion. ISDN transmits data  
digitally, resulting in a very clear transmission quality. There is none of the static and noise of  
analog transmissions that can slow transmission speed.  
“Network” refers to the fact that ISDN is not simply a point-to-point solution like a leased line.  
ISDN networks extend from the local telephone exchange to the remote user and include all  
of the telecommunications and switching equipment in between. When you have ISDN, you  
can make connections throughout the world to other ISDN equipment. If your ISDN  
equipment includes analog capabilities, you can also connect to analog modems, fax  
machines, and telephones, even though they may be connected to plain old telephone  
service.  
Benefits  
While ISDN accommodates telephones and fax machines, its most popular advantage is in  
computer applications. You can plug an ISDN adapter into a phone jack, like you would an  
analog modem, and get a much faster connection with no “line noise.” The most common  
ISDN service, Basic Rate Interface (BRI), provides two 64 Kbps channels per line. When the  
two channels are bonded in a single connection, you get a speed of 128 Kbps, which is about  
four times the actual top speed of the fastest analog modems. Compression can increase  
throughput to around 250 Kbps.  
DIVA T/A ISDN Modem Reference Guide N Page 4  
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What is ISDN?  
Telecommuters, for example, benefit immensely from ISDN. Whether you access the  
corporate LAN in the evenings or maintain a full-time, remote home office, ISDN is the next  
best thing to being there. E-mail, database access, and file transfers improve dramatically,  
making it seem like you're locally attached to the LAN.  
Internet access is another great application for ISDN. Compared with even the fastest modem  
access, ISDN makes Web graphics appear almost immediately, and can reduce download  
times by over 75%. ISDN can even provide advantages over shared, higher-bandwidth office  
connections; PC Magazine advises that an ISDN connection can deliver better performance  
than a T1 shared among users on a LAN. And in many markets, it's actually cheaper than an  
isolated analog business line.  
Such large-scale file transfer applications as medical imaging, insurance and law enforcement  
imaging, and the preparation of printed materials are additional arenas where ISDN proves  
highly beneficial. With the dramatic reduction in file transfer time, ISDN makes even  
multi-megabyte files available to recipients within minutes, not hours.  
Videoconferencing is an emerging ISDN application that's growing fast in popularity and  
ISDN is currently the only practical way of making it happen.  
DIVA T/A ISDN Modem Reference Guide N Page 5  
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What is ISDN?  
ISDN Communication Channels  
In the ISDN interface, a number of communication channels are carried over a digital line.  
These communication channels can vary by the type of information they transmit and by the  
transmission speed they support. The number and type of channels used may vary.  
The communication channels can be of the following types:  
B-Channel - 64 Kbps  
D-Channel - 16 or 64 Kbps  
H-Channel - 384, 1536, or 1920 Kbps (not yet commercially available)  
Different combinations of these channels are used to support different types of usage (e.g.,  
basic, primary and broadband).  
B-Channel  
The B-channel is a user (bearer) channel that carries a subscriber's digital traffic (e.g. digitized  
video, voice, audio, or digital data, or perhaps a mixture). The bandwidth of this channel is 64  
Kbps. The control signals used to set up the connection, however, are not sent over the  
B-channel. The call establishment is done on the D-channel using common-channel  
signaling. This concept will be discussed shortly.  
Two kinds of connections can be established over a B-channel:  
Circuit-Switched  
Packet-Switched  
Circuit-switched connections are ideal for voice traffic for several reasons. Voice data is  
“delay-sensitive,” meaning that it must not be delayed, and that it must be received in the  
order in which it was transmitted. There is a call set-up time that is characteristic of  
circuit-switched connections. This time lag is quite acceptable when measured against the  
length of a typical telephone call.  
In a packet-switched data network or PSDN, data to be transmitted is broken up into  
individual units called packets that are then routed from sender to receiver. The  
sender/receiver can be any type of terminal, printer, computer or other device that supports  
an interface to the network.  
D-Channel  
The primary function of the D-channel is to carry common-channel signaling information to  
manage and control circuit-switched calls on B-channels.  
The D-channel can also be used for packet-switching or low-speed telemetry when it is not  
involved in control signaling. Message signaling takes priority over data packet-switching.  
The D-channel functions at 16 Kbps for Basic Rate Interface or 64 Kbps for Primary Rate  
Interface. The speed is dependent on the end-user's interface.  
DIVA T/A ISDN Modem Reference Guide N Page 6  
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What is ISDN?  
H-Channel  
The H-channel is used for high-speed user data traffic at bit rates higher than 64Kbps.  
Examples of services which require these higher rates are fast facsimile, teleconferencing,  
and video. An H-channel user can subdivide the channel using TDM to meet specific  
requirements.  
DIVA T/A ISDN Modem Reference Guide N Page 7  
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What is ISDN?  
Connecting to ISDN - BRI and PRI  
There are two types of access interfaces to the ISDN: Basic Rate Access (also referred to as  
Basic Rate Interface (BRI)) and Primary Rate Access (also referred to as Primary Rate Interface  
(PRI)).  
Basic Rate Access  
Basic Rate Interface or Access consists of two B-channels operating at 64 Kbps and one  
D-channel operating at 16 Kbps. It is also commonly referred to as 2B+D.  
Primary Rate Access  
The primary rate interface is designed for users with large capacity requirements.  
There is no single transmission rate defined for primary rate access. In North America and  
Japan, for example, primary rate interface is based upon the T1 rate (defined in detail shortly)  
of 1.544 Mbps. In Europe, by comparison, the rate is 2.048 Mbps.  
DIVA T/A ISDN Modem Reference Guide N Page 8  
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What is ISDN?  
What is Multilink PPP?  
Multilink PPP combines two 64 Kbps ISDN channels to provide a maximum transmission  
speed of 128 Kbps. The DIVA T/A serves as an intermediary between its host workstation and  
the remote device to which data is being transmitted. All the protocol processing required  
for the negotiation of a Multilink PPP connection is performed on the DIVA T/A itself. The PC  
forwards asynchronous PPP packets to the DIVA T/A which, in turn, converts the packets for  
synchronous transmission and negotiates the various authentications required to establish  
the Multilink PPP connection with the target system over ISDN lines. This allows for the more  
efficient use of the ISDN line without requiring any changes to the PPP stack currently loaded  
on your PC.  
DIVA T/A supports COM port rates of up to 230.4 kbps. However, some computer COM ports  
are limited to 115.2 kbps. If you want to use your DIV AT/A at its maximum speed, install a  
“fast COM port” card (UART 16650 based).  
DIVA T/A ISDN Modem Reference Guide N Page 9  
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What is ISDN?  
What is BACP/BOD?  
DIVA T/A supports the Bandwidth Allocation Control Protocol (BACP) and Bandwidth on  
Demand (BOD). BACP/BOD refers to the ability of a system to allocate and remove links in a  
multilink connection in order to lower or increase its bandwidth.  
BACP/BOD monitors the flow of traffic across your ISDN connection. When the traffic on the  
first B-channel reaches a threshold level for a defined period of time (either because of  
deteriorating line conditions or increased traffic), the second B-channel is automatically  
added. The second B-channel is kept active as long as traffic remains above the threshold  
level. When the traffic drops below the threshold level, the second B-channel is dropped.  
When used in conjunction with AO/DI, the D channel flow of data is evaluated and compared  
to the threshold in order to add or remove the first B channel.  
Since BACP/BOD automatically adds and drops the second B-channel in response to traffic  
peaks and declines, the process is completely transparent.  
BACP/BOD is an excellent way to reduce communications charges in situations where your  
demand for ISDN bandwidth fluctuates.  
DIVA T/A ISDN Modem Reference Guide N Page 10  
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What is ISDN?  
What is DBA?  
DIVA T/A also supports Dynamic Bandwidth Allocation (DBA), known also as Call Bumping.  
DBA automatically drops one B-channel to allow an incoming or outgoing telephone, fax or  
modem call. When the voice call is over, DBA automatically re-establishes the multilink  
session by reconnecting the second B-channel, if the throughput requires it. It is  
recommended that you use DBA with BACP/BOD so that you can have greater flexibility  
when using the DIVA T/A.  
Note: If an analog device is used on the server side of the connection, DBA will not restore a  
channel that has been bumped.  
DIVA T/A ISDN Modem Reference Guide N Page 11  
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What is ISDN?  
What is Always On / Dynamic ISDN (AO/DI)?  
AO/DI is only available if you have subscribed to it, your ISDN service provider supports it,  
and you are using Multilink PPP. AO/DI uses the ISDN D-channel X-25 packet service to  
maintain an “always on” connection between you and your Service Provider. Low bandwidth  
requirements can be met using this constant connection, such as sending and receiving  
e-mail, credit card verification, etc.  
If additional bandwidth is required (to download a large file, for example), AO/DI, in  
conjunction with Bandwidth on Demand (BOD), automatically adds B-channels of 64 Kbps  
each, for a total of 128 Kbps when both B-channels are in use. When the additional  
bandwidth is no longer required, one or both B-channels are dropped, leaving the D-channel  
connection in place.  
AO/DI enhances ISDN use in a number of ways:  
AO/DI can quickly and automatically adjust to the voice and data needs of end-users. For  
example, if both B-channels are bonded in a data connection, and an incoming call is  
received, one of the B-channels is automatically freed up for the telephone call. If a fax  
call also comes in, the remaining B-channel may be allocated to the fax call. The data  
connection continues on the D-channel until a B-channel is available, if needed.  
As B-channels are invoked only when additional bandwidth is needed, connection costs  
are significantly reduced.  
DIVA T/A ISDN Modem Reference Guide N Page 12  
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What is ISDN?  
What is Data Compression?  
To establish communications over a PPP link, each end of the connection must first send  
packets to configure and test the data link. After the link has been established, optional  
facilities may be negotiated as needed. One such facility is data compression. A wide variety  
of compression methods may be negotiated, although typically only one method is used for  
both directions of the link.  
Data compression is a process where the effective throughput is increased by encoding data  
in such a way that fewer bits are required to represent it. For example, a text file might be  
compressed by representing common words with single characters; thus if the word “the” is  
represented by the character “@, it will be transmitted three times faster. Popular  
compression algorithms typically reduce the size of the data by 50%, effectively doubling the  
rate at which it is transmitted.  
The Compression Control Protocol (CCP) works with MLPPP and is responsible for  
configuring, enabling, and disabling data compression algorithms on both ends of the  
point-to-point link. PC Compression negotiation takes precedence over the DIVA T/A  
negotiation for performance considerations (for example, the PC compression may reduce  
the number of bytes that go through the serial interface, the PC has the quicker CPU, etc.).  
The DIVAT/A compression negotiation, however, will assume control should no compression  
be detected or the initial negotiation fail. No user configuration is required to enable the  
DIVA T/A's compression functionality. Compression algorithms currently supported by the  
DIVA T/A include Stacker LZS (Hi/fn), MPPC (Microsoft), and Ascend.  
DIVA T/A ISDN Modem Reference Guide N Page 13  
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Locating AT Commands  
To make it easier for you to locate a command, this guide has organized commands in two  
ways.  
A list of AT Commands grouped into categories can be found on page 16.  
An alphabetical list of commands is available on page 17.  
AT Command Syntax Conventions  
When issuing AT commands, you must abide by the following syntax conventions:  
A command line consists of a prefix, body, and terminator. Each command line must  
begin with “AT” (except A/).  
AT commands must be terminated by a carriage return (except A/).  
Commands entered in upper or lower case are accepted (except mini-monitor  
commands, which must be entered only in lower case).  
The body is a string of commands restricted to printable ASCII characters (032 - 126).  
Space (ASCII 032) and control characters other than CR (ASCII 013) and BS (ASCII 010) in  
the command string are ignored.  
A command line may be aborted at any time by entering <Ctrl-X> (ASCII 024).  
Carriage returns are programmable through register S3.  
The default terminator is the ASCII <CR> character. Characters that precede theAT prefix  
are ignored.  
The DIVA T/A recognizes the backspace character. When echo is enabled, a backspace or  
delete is echoed as a backspace character followed by a space character, and another  
backspace. The code for the backspace character is programmable through register S5.  
Values equal to 0, greater than 32, or the carriage return character value, cannot be used  
for the backspace character.  
The AT sequence may be followed by any command sequence, except for the following:  
ATZ, ATD, ATA, AT@MENU, AT>H, AT>VC, AT>VD, AT>VT, and AT>Z. Commands following  
these are ignored.  
Execution of commands ATD and ATA, either as a result of a direct command or a  
re-execute command, will be aborted if another character is entered before completion  
of the handshake.  
The maximum number of characters on any command line is 80 (including “A” and “T”).  
If a syntax error is found in a command, the remainder of the line will be ignored and an  
ERROR code will be returned.  
Missing decimal parameters (n) are assumed as 0.  
Most commands entered with parameters out of range will not be accepted and the  
ERROR response will be returned to the DTE.  
DIVA T/A ISDN Modem Reference Guide N Page 14  
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Locating AT Commands  
The next command will only be accepted by the DIVA T/A once the previous command  
has been fully executed.  
DIVA T/A ISDN Modem Reference Guide N Page 15  
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Alphabetical List of Supported  
AT Commands  
The following tables summarize, in alphabetical order, theAT Commands supported by the  
DIVA T/A. Go to the specified page number for more information on a particular command.  
Note: Command descriptions preceded by the word “static” indicates a static parameter.  
Changes made to static parameters do not take effect immediately (as opposed to “dynamic”  
parameters, where changes take effect the moment they are made). To implement a change  
to a static parameter, use the AT&Wn command; the changes will be implemented when you  
restart your system.  
A list of command groups can be found on page 16.  
DIVA T/A ISDN Modem Reference Guide N Page 17  
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Alphabetical List of Supported AT Commands  
AT! Commands  
Directory Number/Port Assignment (static)  
ISDN Switch Type (static)  
Enable/Disable Non-initializing mode for primary B-channel (North America  
only) (static)  
Enable/Disable Non-initializing mode for second B-channel (North America  
only) (static)  
ISDN SPID Number for primary B-channel (North America only) (static)  
ISDN SPID Number for second B-channel (North America only) (static)  
Specify Default DTE Speed.  
Specify Default Databits length  
Specify Default Parity  
Specify Default Number of Stopbits.  
V.120 N201 Tx (Maximum Transmit Frame Size)  
V.120 N201 Rx (Maximum Receive Frame Size)  
V.120 Multiframe Mode  
V.120 K Window Size  
V.120 T200 (Retransmission Timer)  
V.120 N200 (Maximum Retry Count)  
V.120 T203 (Link Integrity Timer)  
V.120 Idle Timer  
Set ISDN Encoding Law  
ISDN Directory Number Assignments for 1st B-channel and 1st Phone port  
(static)  
ISDN Directory Number Assignments for 2nd B-channel and 2nd Phone port  
(static)  
ISDN Subaddress for 1st B-channel (static)  
ISDN Subaddress for 2nd B-channel (static)  
ISDN Directory Number for Data Ports (International only) (static)  
ISDN Subaddress for Data Ports (International only) (static)  
Outgoing Call Type  
Incoming Call Assignment, First Directory Number  
Incoming Call Assignment, Second Directory Number  
V.110 Configuration Override (International version only)  
V.110 Stream Rate (International version only)  
V.110 Character Length (International version only)  
DIVA T/A ISDN Modem Reference Guide N Page 18  
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Alphabetical List of Supported AT Commands  
V.110 Parity (International version only)  
V.110 Stop Bits (International version only)  
V.110 Flow Control (International version only)  
Specifies the X.25 version you are using.  
Specifies the X.25 DTE address.  
Specifies the X.25 facilities that are to be included each time a call is made.  
Specifies the local ISDN prefixes to be used.  
Specifies the X.25 default window size.  
Specifies the X.25 maximum window size  
Specifies the X.25 default packet size  
Specifies the X.25 maximum packet size  
Specifies the Terminal Endpoint Identifier used for X.25 over the D-channel.  
Specifies the delay before opening 1st B-channel  
Specifies the 1st B-channel Opening Threshold  
Specifies the 1st B-channel Closing Threshold  
With BACP disabled, specifies the 2nd B-channel Retry Delay.  
With BACP enabled, specifies the delay before opening 2nd B-channel.  
Specifies the 2nd B-channel Opening Threshold  
Specifies the 2nd B-channel Closing Threshold  
Strips the area code from phone numbers.  
Specifies the X.25 transmit queue threshold.  
Set Normal Mode for Bandwidth on Demand.  
Set Economy Mode for Bandwidth on Demand.  
Set Performance Mode for Bandwidth on Demand.  
Specifies the Lowest Logical Connection Number.  
Specifies whether the AO/DI feature is enabled or disabled.  
Specifies how many Logical Connection Numbers (LCN) are used.  
Specifies the contents of the user data field in the X.25 Call Request packet.  
Delay between 64K data call failure and 56K data call attempt.  
DIVA T/A ISDN Modem Reference Guide N Page 19  
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Alphabetical List of Supported AT Commands  
AT% Comm ands  
Protocol Control (static)  
ISDN Communication Speed  
AT%A95=c Incoming Data Call Answer  
Local Endpoint Discriminator Class  
Remote Endpoint Discriminator Class  
Local Endpoint Discriminator Address  
Remote Endpoint Discriminator Address  
Enable Bandwidth Allocation Control Protocol / Bandwidth on Demand  
Set Initial Billing Interval Timer  
Set Billing Interval Timer  
Dynamic Bandwidth Allocation  
Second B-channel Connection Retries  
AT%P10=n Enable/disable PPP Echo-Requests  
DIVA T/A ISDN Modem Reference Guide N Page 20  
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Alphabetical List of Supported AT Commands  
AT& Com mands  
Data Carrier Detect  
Data Terminal Ready  
Loading Factory Profile  
Flow Control  
Data Set Ready  
View Current and Stored Profile  
Save Current to Stored Profile  
Designate Stored Profile n as the Powerup Profile  
Store Telephone Number(s)  
DIVA T/A ISDN Modem Reference Guide N Page 21  
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Alphabetical List of Supported AT Commands  
AT* Com mands  
Abbreviated Ring Control (North America only)  
ISDN Bearer Capability (static)  
Analog Device Caller ID Delivery (static)  
Internal Dial Access (Calling Features) (static)  
Analog Device port Incoming/Outgoing Call Selection  
Analog Device Ring Frequency (static)  
Analog Device Calling Features (North America only) (static)  
Visual Message Waiting Indicator Refresh Time (North America only)  
Analog Device Country Specific Parameters (static)  
Analog Device Ring Type (static)  
Disable Calling Features (Analog Device) (static)  
Disable/Enable VoiceMail (North America only) (static)  
Call Waiting Support (International version only).  
DIVA T/A ISDN Modem Reference Guide N Page 22  
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Alphabetical List of Supported AT Commands  
AT> Commands  
Last AT Command Result Explained  
Restores All Profiles to Factory Settings  
Reset Current Profile  
View Help Information  
View Current Profile  
View Call and COM Port Parameters  
View Dynamic Parameters  
View Protocol Parameters  
View Static Parameters  
View Link And Connection Status Information  
View Connection Status  
Initialization Status Display (North America Only)  
View Link States  
View Stored Profile n  
View Stored Phone Numbers  
View X.25 Status (AO/DI)  
Restart the DIVA T/A  
DIVA T/A ISDN Modem Reference Guide N Page 23  
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Alphabetical List of Supported AT Commands  
AT@ Commands  
AT@DATE? Current Date  
AT@DATE= Set Date  
Activate VT100 Configuration Tool  
Current Time  
AT@TIME= Set Time  
DIVA T/A ISDN Modem Reference Guide N Page 24  
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Alphabetical List of Supported AT Commands  
Other AT Commands  
View Last Accessed S Switch  
Last accessed S-Register to Value n  
Answer Calls  
Re-execute Previous Command  
Dial a Number  
Local Echo  
Hang up a Call  
View Product Information  
Return Online  
Quiet Result Codes  
Establishes S-Registers n as the selected register  
S-Register n to Value v  
Value of S-Register n  
Result Code Format  
Connect Message Control  
Extended Results Code  
Restart the DIVA T/A  
DIVA T/A ISDN Modem Reference Guide N Page 25  
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Alphabetical List of Supported AT Commands  
S-Registers  
Auto-Answer  
View Ring Count  
Escape Character  
Carriage Return Character  
Line Feed Character  
Back Space Character  
Data Terminal Ready Detection Delay  
DIVA T/A ISDN Modem Reference Guide N Page 26  
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Alphabetical List of Supported AT Commands  
AT$ (Utility) Commands  
Enable/Disable Compression  
View Exprintf buffer  
On Demand SPID Testing (North America only)  
SPID Guessing (North America only)  
Action on fatal error  
Stop LAPD Trace  
Stop Mail Trace  
Stop PPP Trace  
Stop Q.931 Trace  
Stop X.25 trace (AO/DI)  
Set AT command trace  
View Initial Profile  
Start or View a LAPD Trace  
Start or View a Mail Trace  
Start or View a PPP Trace  
Start or View a Q.931 Trace  
Internal T/A access command  
Start AO/DI trace  
Enter Mini Monitor on Next Reset  
Soft Reset device and Enter Mini-Monitor  
DIVA T/A ISDN Modem Reference Guide N Page 27  
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Alphabetical List of Supported AT Commands  
Mini-monitor Commands  
These command are only available when you are in Mini-monitor mode; they are not  
available when you are in command mode. The commands AT$Y or AT$Z will enter the  
Mini-monitor; see page 27 for more information. These commands are all case sensitive.  
Dump Memory  
DRAM test  
Flash test  
ISDN internal loop back test  
ISDN external loop back test  
Restore Profiles to Original Settings  
Simulate a fault  
Load New Firmware  
at@md arg Display memory  
Display Cause for Entering Monitor  
Exit the Mini-monitor mode.  
DIVA T/A ISDN Modem Reference Guide N Page 28  
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General AT Commands  
The following table describes the general AT commands available to the DIVA T/A.  
ATIn  
View Product Information. Displays information about your DIVA T/A.  
n=0 Displays hardware code for the DIVAT/A.  
n=1 Displays software checksum.  
n=2 Reports “OK.  
n=3 Displays software version.  
n=4 Displays capability string.  
n=6 Displays data pump chipset version.  
n=8 Displays Eicon Technology DIVAT/A.  
n=9 Display the external COM port plug and play ID of the DIVAT/A.  
n=20 Displays product number.  
n=100 Displays list of supported countries (phone).  
ATO  
Return Online. In the online data mode, the DIVA T/A is ready to send and receive data,  
providing you are connected. Normally, the DIVAT/A remains in this mode until your  
computer sends the data mode escape sequence (+++) or until the call is terminated.  
Note: This command can only be used when the DIVA T/A is in the online escape mode.  
AT@DATE=  
Set Date. Sets the date on the DIVA T/A. This command is useful when the DIVA T/A  
sends the call ID to a telephone with Call Display (North America only).  
AT@DATE?  
AT@TIME=  
Current Date. Displays the current date of the system. The format is mm-dd-yy.  
Set Time. Sets the time on the DIVA T/A. This command is useful when the DIVA T/A  
sends the call ID to a telephone with Call Display. The format is hh:mm:ss.  
AT@TIME?  
AT@MENU  
Current Time. Displays the current time of the system. The format is hh:mm:ss.  
Activate VT100 Configuration Tool. The AT@MENU command activates the DIVA T/A  
VT100 Configuration tool for configuring basic ISDN parameters.  
AT>Hs  
AT>VD  
View Help Information. Displays full or partial help for any AT command, where s  
specifies which AT command help is requested.  
View Connection and Link Status Information. This command displays link and  
connection status for troubleshooting problems. Your Eicon Technology Customer  
Services representative may ask you to display this information.  
AT>VDC  
AT>VDD  
View Connection Status. Displays the connection status.  
Initialization Status Display (North America only). Displays information about the  
detection progress, the initialization of the logical channels, as well as auxiliary  
information.  
AT>VDL  
AT>VT  
View Link States. Displays the link states.  
View Stored Telephone Numbers. You can display a list of all stored telephone  
numbers currently saved on your DIVA T/A.  
AT>VX  
AT>?  
View X.25 Status (AO/DI). Displays the status of the X.25 connection.  
Last AT Command Result Explained. The AT>? Command reports the result of the last  
AT command issued. This command is useful for debugging long strings of AT  
commands and for determining which command was rejected and why.  
DIVA T/A ISDN Modem Reference Guide N Page 29  
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General AT Commands  
A/  
Re-execute Previous Command. Re-executes all the commands in the command  
buffer. This commandismainly used to place anothercall (usingthe ATD dial command)  
that failed to connect due to a busy line, no answer, or a wrong number. This command  
is not preceded by AT nor followed by Enter.  
+++  
Escape Sequence. The escape sequence is used to return to the command state from  
data state. To issue the escape sequence, wait a moment, enter the escape character  
three consecutive times (+++), then wait another moment. Its value is stored in  
S-Register 2. The default value of the escape character as stored in S-Register 2 is ‘+.  
DIVA T/A ISDN Modem Reference Guide N Page 30  
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ISDN Configuration Commands  
The following table describes the ISDN Configuration Commands.  
AT!An  
Directory Number/Port Assignment. This command specifies which ports answer  
to which directory numbers. There are six ports available on the DIVA T/A: Phone 1,  
Phone 2, Voice to PC 1, Voice to PC 2, Data 1, and Data 2.  
Determining the value for n  
Use the binary table below. If a bit is set to 0, the corresponding port answers  
Directory Number 1. If set to 1, the corresponding port answers Directory Number 2.  
Convert the binary to decimal and use the result in the AT!An command.  
Bit 5  
Bit 4  
Bit 3  
Bit 2  
Bit 1  
Bit 0  
Phone Port 1  
Phone Port 2  
Voice to PC 1 Voice to PC 2  
Data 1  
Data 2  
For example, to have Phone Port 1 and Data 1 answer to Directory Number 2 (and the  
others to answer to Directory Number 1), create the binary form from the table  
(100010), then convert to decimal (34). The command would be AT!A34.  
Directory numbers are specified using the AT!N1 (for directory number 1) and AT!N2  
(for directory number 2). A unique number can also be assigned to the data ports  
using AT!N5. If AT!N5 is set, the assignments for the two data ports using theAT!An  
command are ignored, but the Phone Port and Voice to PC assignments are kept.  
Values for n:  
A complete list of values for n is shown below. Ports are considered assigned to  
Directory Number 1 unless specified as being assigned to Directory Number 2.  
Abbreviations: Ph=Phone, VPC=Voice to PC, D=Data, DN=Directory Number.  
n
Assigned to D2  
n
Assigned to D2  
n
Assigned to D2  
0
1
2
3
4
5
6
7
8
9
None (all to DN1)  
D2  
22 Ph2, VPC2, D1  
44 Ph1, VPC1, VPC2  
45 Ph1, VPC1, VPC2, D2  
46 Ph1, VPC1, VPC2, D1  
47 Ph1, VPC1, VPC2, D1, D2  
48 Ph1, Ph2  
23 Ph2, VPC2, D1, D2  
24 Ph2, VPC1  
D1  
D1, D2  
VPC2  
25 Ph2, VPC1, D2  
26 Ph2, VPC1, D1  
VPC2, D2  
VPC2, D1  
VPC2, D1, D2  
VPC1  
27 Ph2, VPC1, D1, D2  
28 Ph2, VPC1, VPC2  
29 Ph2, VPC1, VPC2, D2  
30 Ph2, VPC1, VPC2, D1  
49 Ph1, Ph2, D2  
50 Ph1, Ph2, D1  
51 Ph1, Ph2, D1, D2  
52 Ph1, Ph2, VPC2  
VPC1, D2  
31 Ph2, VPC1, VPC2, D1, D2 53 Ph1, Ph2, VPC2, D2  
10 VPC1, D1  
32 Ph1  
54 Ph1, Ph2, VPC2, D1  
55 Ph1, Ph2, VPC2, D1, D2  
56 Ph1, Ph2, VPC1  
11 VPC1, D1, D2  
12 VPC1, VPC2  
13 VPC1, VPC2, D2  
14 VPC1, VPC2, D1  
15 VPC1, VPC2, D1, D2  
16 Ph2  
17 Ph2, D2  
18 Ph2, D1  
19 Ph2, D1, D2  
20 Ph2, VPC2  
21 Ph2, VPC2, D2  
33 Ph1, D2  
34 Ph1, D1  
35 Ph1, D1, D2  
36 Ph1, VPC2  
57 Ph1, Ph2, VPC1, D2  
58 Ph1, Ph2, VPC1, D1  
59 Ph1, Ph2, VPC1, D1, D2  
60 Ph1, Ph2, VPC1, VPC2  
61 Ph1, Ph2, VPC1, VPC2, D2  
62 Ph1, Ph2, VPC1, VPC2, D1  
63 All assigned to D2; none  
assigned to D1  
37 Ph1, VPC2, D2  
38 Ph1, VPC2, D1  
39 Ph1, VPC2, D1, D2  
40 Ph1, VPC1  
41 Ph1, VPC1, D2  
42 Ph1, VPC1, D1  
43 Ph1, VPC1, D1, D2  
Defaults:  
Directory Number 1  
Ph1, VPC1, D1  
Ph1, VPC1, VPC2, D1, D2  
Directory Number 2  
Ph2, VPC2, D2  
Ph2  
North America: n=21  
International: n=16  
DIVA T/A ISDN Modem Reference Guide N Page 31  
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ISDN Configuration Commands  
AT!C1=n  
ISDN Switch Type. Specifies the ISDN Switch Type.  
For North American Firmware:  
n=0 National ISDN  
n=1 AT&T 5ESS Custom  
n=9 Auto-detect switch type (default for North America). The DIVA T/A automatically  
determines the correct switch type to be used (National ISDN or AT&T 5ESS  
Custom).  
For International Firmware:  
n=2 EuroISDN (default).  
n=3 Australia - Microlink (TPH1962/TS013).  
n=4 INS-Net64 (Japan).  
n=5 China ISDN.  
n=6 Singapore  
n=11 Australia - OnRamp (Telstra's ETSI service)  
Note: This parameter does not take effect until you restart your DIV AT/A.  
AT!C4=n  
AT!C5=n  
AT!C6=n  
AT!C7=n  
AT!D1=n  
AT!D2=n  
Enable/Disable Non-Initializing mode (first B-channel) (North American only).  
Specifies whether the first B-channel is set to Non-Initializing mode.  
n=0 Disable Non-initializing mode (default).  
n=1 Enable Non-initializing mode.  
Note: This parameter does not take effect until you restart your DIV AT/A.  
Enable/Disable Non-Initializing mode (second B-channel) (North American only).  
Specifies whether the second B-channel is set to Non-Initializing mode.  
n=0 Disable Non-initializing mode (default).  
n=1 Enable Non-initializing mode  
Note: This parameter does not take effect until you restart your DIV AT/A.  
SPID Number for 1st B-channel (North American only). The SPID (Service Profile  
Identifier) as assigned by your local telephone company. This number is a unique ID  
which identifies an ISDN terminal to the local ISDN switch.  
Default: null string.  
Note: This parameter does not take effect until you restart your DIV AT/A.  
SPID Number for 2nd B-channel (North America only). The SPID (Service Profile  
Identifier) as assigned by your local telephone company. This number is a unique ID  
which identifies an ISDN terminal to the local ISDN switch.  
Default: null string.  
Note: This parameter does not take effect until you restart your DIV AT/A.  
Default DTE Speed. Specifies the speed of the DTE, when the DTE characteristics  
cannot be determined by AutoBauding (AT has not been typed since power up).  
Values: 1200, 2400, 3600, 4800, 7200, 9600, 12000, 14400, 19200, 24000, 28800,  
38400, 57600, 64000, 115200 or 230400.  
Default: 115200.  
Default Databits Length. Specifies the length of the Databits, when the DTE  
characteristics cannot be determined by AutoBauding (AT has not been typed since  
power up).  
Values: 7, 8.  
Default: 8.  
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ISDN Configuration Commands  
AT!D3=n  
AT!D4=n  
Default Parity. Specifies the parity to be used, when the DTE characteristics cannot  
be determined by AutoBauding (AT has not been typed since power up).  
n=0 None (default).  
n=1 Even.  
n=2 Odd.  
Default Stopbits. Specifies the number of Stopbits to be used, when the DTE  
characteristics cannot be determined by AutoBauding (AT has not been typed since  
power up).  
Values: 1, 2.  
Default:1  
AT!Ln  
Set ISDN Encoding Law. Specifies the type of encoding law for ISDN voice calls.  
n=0 If the switch type is EuroISDN or TPH, A law will be used; if the switch type is  
INS-Net64, NI-1, or 5ESS, µ law will be used (default).  
n=1 µ law.  
n=2 A law.  
Note: This parameter does not take effect until you restart your DIV AT/A.  
AT!N1=n  
ISDN Directory Number Assignments for 1st B-channel and 1st Phone port. This  
command assigns one ISDN directory number to the 1st B-channel and up to two  
numbers to the 1st Phone port. The 1st B-channel only responds to the first number  
specified in the command, while the 1st Phone port responds to either number.  
Numbers are separated by a semicolon (;).  
Example: Sending the command AT!N1=5551234;5551235 to the DIVAT/A  
assigns the number 5551234 to the 1st B-channel, and the numbers 5551234 and  
5551235 to the 1st Phone port. If a data call is placed to 5551234, the 1st B-channel  
will answer. If a data call is placed to 5551235, the 1st B-channel will not answer.  
However, the 1st Phone port will answer analog calls placed to either number.  
For outgoing calls, both data and analog, the DIVA T/A uses the first of these two  
numbers to identify itself.  
Note: In North America, you may only assign one number to the phone port.  
Valid digits: 0-9, *, and #. Maximum: 20 (North America), 40 (International).  
Default: null string.  
Note: This parameter does not take effect until you restart your DIV AT/A.  
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ISDN Configuration Commands  
AT!N2=n  
ISDN Directory Number Assignments for 2nd B-channel and 2nd Phone port.  
This command assigns one ISDN directory number to the 2nd B-channel and up to  
two numbers to the 2nd Phone port. The 2nd B-channel only responds to the first  
number specified in the command, while the 2nd Phone port responds to either  
number. Numbers are separated by a semicolon (;).  
Example: Sending the command AT!N2=5551234;5551235 to the DIVAT/A  
assigns the number 5551234 to the 2nd B-channel, and the numbers 5551234 and  
5551235 to the 2nd Phone port. If a data call is placed to 5551234, the 2nd B-channel  
will answer. If a data call is placed to 5551235, the 2nd B-channel will not answer.  
However, the 2nd Phone port will answer analog calls placed to either number.  
For outgoing calls, both data and analog, the DIVA T/A uses the first of these two  
numbers to identify itself.  
Note: In North America, you may only assign one number to the phone port.  
Valid digits: 0-9, *, and #. Maximum: 20 (North America), 40 (International).  
Default: null string.  
Note: This parameter does not take effect until you restart your DIV AT/A.  
AT!N3=n  
AT!N4=n  
AT!N5=n  
AT!N6=n  
ISDN Subaddress for 1st B-channel. The ISDN subaddress is used to further identify  
the terminal on the ISDN basic rate interface. In cases where two terminals share the  
same directory number, the subaddress identifies which terminal will answer a  
particular incoming call.  
Valid digits: 0-9, *, and #. Maximum: 20.  
Default: null string (this is an optional value).  
Note: This parameter does not take effect until you restart your DIV AT/A.  
ISDN Subaddress for 2nd B-channel. The ISDN subaddress is used to further  
identify the terminal on the ISDN basic rate interface. In cases where two terminals  
share the same directory number, the subaddress identifies which terminal will  
answer a particular incoming call.  
Valid digits: 0-9, *, and #. Maximum: 20.  
Default: null string (this is an optional value).  
Note: This parameter does not take effect until you restart your DIV AT/A.  
ISDN Directory Number for Data Ports (International only). This command assigns  
a unique directory number to be answered by data ports. Once set, the data ports  
will respond to this directory number only, ignoring assignments set via AT!N1, AT!N2,  
and AT!A.  
Valid digits: 0-9, *, and #. Maximum: 20.  
Default: null string (this is an optional value).  
Note: This parameter does not take effect until you restart your DIV AT/A.  
ISDN Subaddress for Data Ports (International only). This command assigns a  
subaddress to be used with the directory number assigned with AT!N5. The ISDN  
subaddress is used to further identify the terminal on the ISDN basic rate interface.  
If AT!N5 is reset to null (AT!N5=), this parameter is set to null as well.  
Valid digits: 0-9, *, and #. Maximum: 20.  
Default: null string (this is an optional value).  
Note: This parameter does not take effect until you restart your DIV AT/A.  
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ISDN Configuration Commands  
AT!On  
Outgoing Call Type. Specifies the default call type for outgoing calls when a user  
enters an ATD command without a special modifier. Use of a modifier overrides this  
parameter.  
n=0 Data call using protocol set in AT%A2=n (default).  
n=3 Data over voice bearer capability call (North America only)  
n=4 Transparent over voice (Audio) (reserved for RVSCOM).  
n=5 Transparent over voice (speech) (reserved for RVSCOM).  
The n=4 and n=5 options (transparent over voice) send and receive voice data  
unmodified to and from the ISDN B channel and the DIVA T/A. When no data is being  
transferred, the protocol fills the outgoing ISDN line with ‘voice silence’ bit patterns.  
For more details, refer to the RVSCOM documentation.  
AT!X56=n  
Delay between 64K data call failure and 56K data call attempt. If a 64K data call  
fails due to network congestion or if a service or option was not available or not  
implemented, a 56K data connection is automatically attempted. This command  
specifies the delay, in seconds, before the 56K attempt is made.  
Values: 0-10 (wait n seconds before retry); 254 (use pre-configured values depending  
on region); 255 (do not attempt 56k data call retry).  
Default: Australia & Japan, no retry (n=255); all other regions, immediate retry (n=254).  
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COM Port Configuration Commands  
The following AT commands pertain to the COM port configuration.  
AT&Cn  
ATEn  
Data Carrier Detect. This command controls the Data Carrier Detect (DCD) output.  
n=0 DCD always enabled.  
n=1 DCD tracks connection (default).  
Local Echo. The E command enables or disables command echo on your computer. If  
you do not see commands entered on your screen, enable command echo. If you see  
double characters, disable command echo.  
n=0 Disables local echo.  
n=1 Enables local echo (default).  
ATQn  
AT Vn  
AT Wn  
Quiet Result Codes. This command enables or disables the sending of result codes to  
the DTE.  
n=0 Enables result codes to the DTE (default).  
n=1 Disables result codes to the DTE.  
Result Code Format. You can set your DIVA T/A to display messages as digits or words.  
Word responses are preferable since they are more meaningful.  
n=0 Result codes are sent to the DIVAT/A as numbers (short form).  
n=1 Result codes are sent to the DIVAT/A as full words (long form/verbose) (default).  
Connect Message Control. This command controls the format of connection  
messages.  
n=0 Upon connection, the DIVA T/A reports the DTE speed only; for example,  
CONNECT 19200 (default).  
n=1 Upon connection, the DIVAT/A reports the DCE speed, the protocol, and the DTE  
speed.  
n=2 Upon connection, the DIVA T/A reports the DCE speed; for example, CONNECT  
64000.  
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COM Port Configuration Commands  
ATXn  
Extended Result Codes. This command selects which subset of the result messages  
will be used by the DIVAT/A to inform the DTE of the results from commands.  
n=0 Provide basic result codes: sends only OK, CONNECT, RING, NO CARRIER, ERROR,  
and NO ANSWER.  
n=1 Provide basic result codes and appropriate connection speed (e.g., CONNECT  
2400, CONNECT 19200).  
n=2 Provide basic result codes, connection speed, and DIALTONE detection.  
n=3 Provide basic result codes, connection speed, and BUSY signal detection.  
n=4 Sends all messages (default).  
n=5 Displays the calling number as follows:  
RING  
FROM: calling  
(if the remote number is not known the message UNKNOWN is displayed)  
n=6 Displays information about the call. The following format is used:  
RING [(cip)] called [;calling]  
Where (cip) is CAPI 2.0 compatible information profile. It is only displayed if  
available. When displayed it always appears in parenthesis.  
Where called is the called number. It is always displayed.  
Where ;calling is the number that is calling. It is only displayed if available. When  
displayed it is always preceded by a semi colon “;”  
AT&Dn  
Data Terminal Ready. Controls interpretation of the Data Terminal Ready (DTR) input.  
n=0 Ignore status of DTR signal.  
n=1 Monitor DTR signal: when an on-to-off transition of DTR signal occurs, enter the  
command state. Return to the online state when the ATO command is issued.  
n=2 Monitor DTR signal: when an on-to-off transition of DTR signal occurs, hang up  
and enter the command state (default).  
n=3 Monitor DTR signal: when an on-to-off transition of DTR signal occurs, hang up  
and reset.  
n=9 Monitor DTR signal: when an off-to-on transition of DTR signal occurs,  
automatically dial the stored telephone number 0.  
n=11 Monitor DTR signal: when the DTR goes up, dial pre-stored number. Hang up  
connection when DTR goes down. (Combination of AT&D2 and AT&D9).  
AT&Kn  
AT&Sn  
Flow Control. Enables and disables flow control so that data is stopped and restarted  
when buffer space becomes available.  
n=0 Disables flow control.  
n=3 Enables RTS/CTS flow control (default).  
n=4 Enables XON/XOFF flow control.  
n=6 Enables RTS/CTS and XON/XOFF flow control.  
Data Set Ready. Data Set Ready (DSR) controls the behavior of the DSR output.  
n=0 DSR always on (default).  
n=1 DSR always on after protocol is connected.  
DIVA T/A ISDN Modem Reference Guide N Page 37  
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COM Port Configuration Commands  
AT\Vn  
Connect Message Control. This command controls the format of connection  
messages.  
n=0 Upon connection, the DIVA T/A reports the DTE speed only (default).  
For example, CONNECT 19200.  
n=1 Upon connection, the DIVAT/A reports the DCE speed.  
For example, CONNECT 64000.  
DIVA T/A ISDN Modem Reference Guide N Page 38  
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Call Control Commands  
The following table describes the Call Control Commands.  
AT!T1=n  
Incoming Call Assignment (first directory number). Specifies the type of incoming  
ISDN calls that DIVA T/A can accept on the first directory number.  
n=0 Only available on DIVAT/A models that have an analog device port. Specifies that  
all analog device voice calls (e.g. telephone, fax/modem over ISDN) are directed  
to your analog device port.  
This option does not permit you to receive ISDN data calls. If you want to receive  
ISDN data calls, make sure that one Directory Number has n=1 as the Incoming  
Call Type.  
n=1 Default for models with analog device port.  
With Analog Device Port: Specifies that all regular ISDN data calls are directed to  
your PC, and that all analog device calls (e.g. ordinary phone calls, or fax/modem  
over ISDN calls) are directed to your analog device port  
Without Analog Device Port: Specifies that all regular ISDN data calls are directed  
to your PC. This option does not permit you to receive analog calls.  
n=8 Reserved for use by RVS-COM. Do not set.  
n=9 Reserved for use by RVS-COM. Do not set.  
These last two settings are automatically altered when a FAX application issues  
a +FCLASS command. This ensures incoming and outgoing calls are compatible  
with the necessary fax class.  
AT!T2=n  
Incoming Call Assignment (second directory number). Specifies the type of  
incoming ISDN calls that DIVA T/A can accept on the secondary directory number.  
n=0 Only available on DIVAT/A models that have an analog device port. Specifies that  
all analog device voice calls (e.g. telephone, fax/modem over ISDN) are directed  
to your analog device port.  
This option does not permit you to receive ISDN data calls. If you want to receive  
ISDN data calls, make sure that one Directory Number has n=1 as the Incoming  
Call Type.  
n=1 With Analog Device Port: Specifies that all regular ISDN data calls are directed to  
your PC, and that all analog device calls (e.g. ordinary phone calls, or fax/modem  
over ISDN calls) are directed to your analog device port.  
Without Analog Device Port: Specifies that all regular ISDN data calls are directed  
to your PC. This option does not permit you to receive analog calls.  
n=8 Reserved for use by RVS-COM. Do not set.  
n=9 Reserved for use by RVS-COM. Do not set.  
These last two settings are automatically altered when a FAX application issues  
a +FCLASS command. This ensures incoming and outgoing calls are compatible  
with the necessary fax class.  
DIVA T/A ISDN Modem Reference Guide N Page 39  
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Call Control Commands  
AT%A2=n  
Protocol Control. Specifies the protocol you want to use for your ISDN connection.  
n=0 HDLC-Transparent mode  
n=2 V.120 rate adaption protocol.  
n=4 V.110 rate adaption protocol (international version only)  
n=95 PPP asynchronous to synchronous conversion (International default).  
n=96 Multilink PPP connection (North American default).  
Notes:  
• Both PPP and Multilink PPP require that a PPP communications stack be installed on  
your computer.  
• Both the DIVAT/A and the remote device must be set to the same protocol.  
• Ifyour workstation is configured asa Windows for WorkgroupsRemote Access Service  
(RAS) client, you must configure the V.120 rate adaption protocol on the DIVA T/A  
workstation and the remote device (RAS Server ISDN adapter).  
• When using Multilink PPP for incoming calls, only SPAP or PAP authentication are  
supported.  
• (Windows NT only) In order to support incoming calls with Windows NT RAS Server,  
you must enable the parameter “Allow clear text authentication” in the RAS Server  
setup. Refer to the RAS online help on how to configure this parameter.  
• This parameter is static. Changes do not take effect until you restart your DIVA T/A.  
AT%A4=n  
AT%A95=c  
ISDN Communication Speed. Specifies the ISDN communication speed (56 or 64  
Kbps) at which the DIVA T/A will try to connect to the remote station. The speed only  
applies to calls initiated by your DIVA T/A.  
n=0 Connect at 64 Kbps (default).  
n=1 Connect at 56 Kbps.  
Incoming Data Call Answer. Sets how incoming data calls are handled (accepted or  
rejected).  
c=E All incoming data calls can be accepted either by the DIVA T/A (ATS0=1) or by the  
application (default).  
c=D All incoming data calls are rejected upon receipt.  
AT&Zn=v  
Store Telephone Number. Stores a telephone number v in memory location n. Each  
number consists of the telephone number (up to 25 characters) and an optional  
subaddress (up to 20 characters), separated by a period. Valid characters include the  
digits 0 to 9 as well as *, #, space, hyphen, and parenthesis.  
Range for n: 0-9, so up to ten telephone numbers may be stored.  
Note: The maximum number of dialed digits (that is, the numbers 0-9 and symbols #  
and *) is 20 in North America and 40 for International. If you need to dial a number  
longer than 25 digits, use the ATDn command (see page 41).  
ATA  
Answer Calls. Instructs the DIVA T/A to accept an incoming call.  
DIVA T/A ISDN Modem Reference Guide N Page 40  
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Call Control Commands  
ATDn  
Dial a Number. Directs the DIVAT/A to dial the specified number, attempt to  
establish a connection, and go online.  
Punctuation characters may be used for clarity, with parentheses, hyphens, spaces,  
and periods being ignored. Also, the “P, “T, “W, “@, “,” and “R” dial modifiers used by  
modems are ignored since they are not relevant to ISDN.  
The “~” and “&” characters are used to dial two numbers within the same dialing  
string.  
The following modifiers can be used:  
L
Re-dial last number.  
S=n Dial the number stored in the directory n (n=0-9).  
M
N
I
Establish a Modem over ISDN call.  
Establish a data connection.  
Establish a 56K ISDN data connection.  
V
;
Establish an ISDN DATA over VOICE connection (North America only).  
Any character following this parameter is treated as an AT command (entered in  
the command mode) .  
The maximum number of dialed digits is 20 for North America and 40 for  
International. The symbols # and * are counted as digits; punctuation (parentheses,  
hyphens, spaces, and periods) and alphabetical digits (P, T, W, @, or R) are ignored.  
When dialing multiple numbers using “~” or “&” with MultiLink PPP, each dialed  
number can also have up to 20 digits in North America and 40 for International.  
ATH  
Hang up a Call. To disconnect and hang up a call. If the DIVA T/A is currently online,  
the connection is terminated.  
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V.120 Configuration Commands  
The following AT commands pertain to V.120 configuration on your DIVA T/A.  
AT!E0=n  
V.120 N201 Tx (Maximum Transmit Frame Size). N201 Tx (Maximum Transmit Frame  
Size) determines the maximum number of octets in an information field to be  
transmitted to the remote V.120 device.  
Range: 16 to 260.  
Default: 260.  
Note: If a larger frame needs to be transmitted, the DIVAT/A segments it into V.120  
fragments and expects the remote device to perform reassembly.  
AT!E1=n  
AT!E2=n  
V.120 N201 Rx (Maximum Receive Frame Size). N201 Rx (Maximum Receive Frame  
Size) determines the maximum number of octets in an information field to be received  
from the remote V.120 device.  
Range: 16 to 260.  
Default: 260.  
V.120 Multiframe Mode. The V.120 protocol supports two different transfer modes  
described below:  
n=E Multiframe mode is enabled (default). This mode provides acknowledged  
transfers by using Information (I) and acknowledgment (RR/RNR) frames, and  
provides error correction and recovery procedures. The link verification  
procedure is provided by exchanging SABME and UA frames.  
n=D Unacknowledged mode is enabled. This mode uses Unnumbered Information  
(UI) frames. The link verification procedure is provided by exchangingXID frames.  
The unacknowledged mode is less robust than multiframe mode.  
Note: The DIVA T/A may automatically switch to the other mode if the link verification  
frames issued from the remote device do not match the configured mode on the local  
device. The DIVA T/A always prefers the multiframe mode.  
AT!E3=n  
AT!E4=n  
V.120 K Window Size. Applicable to the multiframe mode only. K (Window Size)  
determines the maximum number of sequential data frames that may be outstanding  
(not acknowledged) at any given time.  
Range: 1 to 127 frames.  
Default: 7.  
V.120 T200 (Retransmission Timer). Applicable to the multiframe mode only. T200  
(Retransmission Timer) is the maximum time allowed to determine if a transmitted  
frame was received by the remote device, prior to its retransmission. The unit of  
measurement is 1/10 of a second.  
Range: 1 to 255.  
Default: 15 (equal to 1.5 seconds).  
The value specified for T200 (Retransmission Timer) must be less than the value  
specified for T203 (Link Integrity Timer) (see “AT!E6=n” on page 43). Otherwise, the  
default values are used.  
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V.120 Configuration Commands  
AT!E5=n  
AT!E6=n  
V.120 N200 (Maximum Retry Count). Applicable to the multiframe mode only. N200  
(Maximum Retry Count) is a system parameter which identifies the maximum number  
of retransmissions of a frame due to T200 expiring. When the maximum number of  
retransmissions is reached, the recovery process is started which may cause call  
disconnection.  
Range: 1 to 10.  
Default: 3.  
V.120 T203 (Link Integrity Timer). Applicable to the multiframe mode only. T203 (Link  
Integrity Timer) is the maximum time allowed without frames (including data and  
control) being exchanged. Its purpose is to verify that the remote device is still online  
and operational. When the Link Integrity Timer expires, recovery procedures are started  
which may cause the disconnection of the current call.  
The unit of measurement is seconds.  
Range: 1 to 255.  
Default: 30.  
The value specified for T200 (Retransmission Timer) (see “AT!E4=n” on page 42) must  
be less than the value specified for T203 (Link Integrity Timer). Otherwise, the default  
values are used.  
AT!E7=n  
V.120 Idle Timer. Idle Timer refers to the maximum time without the exchange of data  
frames between the local and theremote devicesandbefore the automatic termination  
of the connection. Its purpose is to reduce communications costs while data is not  
being transferred for a period of time (operates in both the multiframe and  
unacknowledgement modes). When Idle Timer expires, this immediately initiates the  
disconnection of calls. Setting a zero value disables Idle Timer.  
The unit of measurement is minutes.  
Range: 0 to 10000.  
Default: 1440 (24 hours).  
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V.110 Configuration Commands  
Use the following AT commands to specify the V.110 configuration on your DIVA T/A  
(International version only).  
AT!V0=n  
V.110 Configuration Override. Specifies whether the DIVA T/A uses the COM port  
setting to configure V.110 or overrides them with user settings.  
n=0 Use the default settings.  
n=1 Override the COM port settings as per AT!V1, AT!V2, AT!V3, AT!V4, and AT!V5  
(default).  
AT!V1=n  
AT!V2=n  
AT!V3=n  
V.110 Stream Rate. Specifies the V.110 Stream Rate  
Values: 1200, 2400, 4800, 9600, 19200 (default).  
V.110 Character Length. Specifies the character length.  
Values: 7, 8 (default).  
V.110 Parity. Specifies the parity used for V.110.  
n=0 None (default).  
n=1 Even.  
n=2 Odd.  
n=3 One.  
n=4 Zero.  
AT!V4=n  
AT!V5=n  
V.110 Stop Bits. Specifies the Stop Bits used for V.110.  
Values: 1 (default), 2.  
V.110 Flow Control. Specifies the Flow Control method to be used for V.110.  
n=0 None.  
n=1 Receive only (default).  
n=2 Transmit only.  
n=3 Receive and transmit.  
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Profile Commands  
The following table describes the profile commands:  
AT&F  
Use Factory Settings in Current Profile. Restores and loads all settings in the current  
profile with the original factory settings. Previously configured ISDN commands, stored  
telephone numbers, and the rate adaption control values are retained; all other settings  
are replaced.  
AT&V  
View Current and Stored Profiles. Displays the current and stored profiles as well as  
stored telephone numbers in your DIVA T/A.  
AT&Wn  
Save Settings as Profile n. Writes storable parameters of current profile in memory as  
stored profile n. Use when you are satisfied with your current configuration settings  
and want to save them to a specific stored profile n.  
AT&Yn  
AT>F  
Set Powerup Profile. Designates stored profile n as the powerup profile. Use to load  
your desired stored profile the next time your DIVA T/A is powered up.  
Use Factory Settings in All Profiles. Restores all stored profiles and the current profile  
to the original factory settings. Reverts the powerup profile to number 0. Use when you  
need to reset the device to its original factory settings.  
Warning: All previous user-defined settings are lost.  
AT>FC  
Reset Current Profile andTelephone Numbers. Resets the current profile and  
telephone numbers to the default factory settings.  
AT>VC  
View Current Profile. Presents a screen display of the current profile settings on your  
DIVAT/A.  
AT>VCC  
AT>VCD  
AT>VCP  
View Call and COM Port Parameters. Displays the Call and COM Port dynamic  
parameters.  
View Dynamic Parameters. Displays all dynamic parameters (Call, COM, V.120, V.110.  
PPP, MLPPP).  
View Protocol Parameters. Displays the protocol parameters (V.120, V.110, PPP,  
MLPPP).  
AT>VCS  
AT>VPn  
View Static Parameters. Displays all static parameters (ISDN, Rate Adaptation).  
View Stored Profile. Presents a screen display of the desired stored profile, where n is  
the number of the stored profile (0,1,2) you want to view.  
AT>Z  
ATZn  
Restart DIVA T/A Using Powerup Profile. Restarts your DIVA T/A using the powerup  
profile. Use anytime you want to load the powerup profile.  
Restart DIVA T/A Using Profile n. Restarts your DIVA T/A using stored profile n. Use  
after changing a static parameter.  
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Multilink PPP Commands  
The following table describes the MLPPP configuration commands.  
AT%M1=n  
Local Endpoint Discriminator Class. The value for ‘n’ specifies the Local Endpoint  
Discriminator Class. If you specify n=1 (class 1), the Local Endpoint Discriminator  
Address (specified with AT%M3=n) must be an even number. For a list of classes, see  
AT%M2=n  
AT%M3=n  
AT%M4=n  
AT%P5=n  
Remote Endpoint Discriminator Class. The value for ‘n’ specifies the Remote  
Endpoint Discriminator Class. For a list of classes, see “Endpoint Discriminator  
Local Endpoint Discriminator Address. The value for ‘n’ specifies the Local  
Endpoint Discriminator Address. For a description of permitted addresses, see  
Remote Endpoint Discriminator Address. The value for ‘n’ specifies the Remote  
Endpoint Discriminator Address. For a description of permitted addresses, see  
Bandwidth Allocation Control Protocol (BACP) / Bandwidth on Demand (BOD).  
This command specifies whether BACP/BOD is enabled or disabled. When enabled,  
the DIVA T/A will drop to one B channel (reducing costs) when throughput drops  
below 64K. The DIVA T/A first attempts to negotiate BACP; if this is unsuccessful, the  
DIVAT/A falls back to BOD.  
n=0 Disable (default).  
n=1 Enable.  
Note: You can use this parameter only if the DIVAT/A has been configured for MLPPP.  
AT%P6=n  
AT%P7=n  
Set Initial Billing Interval Timer. Sets the timer (in seconds) to match the amount of  
time your ISDN provider allocates as the first time interval.  
Note: If the value is set to 0, the timer is not used. Setting this value to 0, also  
effectively sets AT%P7 to 0.  
Range: 0 to 65535.  
Default: 60 seconds.  
Set Billing Interval Timer. Sets the timer (in seconds) to match the amount of time  
your ISDN provider designates as the minimum chargeable unit for all subsequent  
billing.  
Note: If the value is set to 0, the timer is not used.  
Range: 0 to 65535.  
Default: 60 seconds.  
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Multilink PPP Commands  
AT%P8=n  
Dynamic Bandwidth Allocation (only available on models equipped with analog  
device ports). Specifies whether Dynamic Bandwidth Allocation (also known as Call  
Bumping) is enabled or disabled. When enabled, the DIVA T/A will automatically  
assign one of the two B channels (both used for data) to an incoming or outgoing  
analog device call (voice). When the call is completed, the DIVA T/A automatically  
reassigns the second B-channel to the data connection.  
n=0 Disable.  
n=1 Enable (default).  
Note: When BACP/BOD is enabled, the 2nd B channel is assigned as a data  
connection only if throughput is above 64KPS. Note also that you can use this  
parameter only if the DIVA T/A has been configured for MLPPP.  
AT%P9=n  
Second B-channel Connection Retries. Specifies the number of times the DIVAT/A  
tries to connect to the second B-channel when BOD is disabled.  
Range: 0-255. Note that when the ISDN Switch Type is set to Singapore (AT!C1=6), the  
range is 0-10.  
Default: 3.  
AT%P10=n  
AT!X13=n  
Enable/Disable PPP Echo-Request. Specifies whether PPP Echo-Request is enabled  
or disabled. Certain services, such as IBM Global Services, require that PPP  
Echo-Request be disabled.  
n=1 Enable (default).  
n=0 Disable  
Second B-channel Retry Delay (with BACP disabled). Specifies the number of  
seconds the DIVA T/A waits before it re-attempts to connect to the second B-channel.  
Range: 0-65535.  
Default: 5 seconds. Note that if the ISDN Switch Type is set to Singapore (AT!C1=6)  
then the default is 60 seconds.  
Note: The description above applies only if BACP is disabled; for a description of  
AT!X13=n when BACP is enabled, see page 51.  
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Multilink PPP Commands  
Endpoint Discriminator Class/Address  
The following table describes the list of classes and permitted addresses for certain MultiLink PPP  
commands.  
Class Description  
Address Format  
0
1
Null Class  
No address is used.  
Locally Assigned  
Address  
Uses a hexadecimal format with a maximum length of 40  
characters.  
Valid characters: “0-9, a-f. The number of digits must be even (ex.  
AT%M3=b3c665ac11).  
2
3
4
Internet Protocol (IP)  
Address  
Uses a numerical format with a maximum length of 15 characters.  
Valid characters: “0-9” (ex. AT%M4=192.219.23.100).  
IEEE 802.1 Globally  
Assigned MAC Address  
Uses a hexadecimal format with an exact length of 12 characters.  
Valid characters: “0-9, a-f” (ex. AT%M3=b3c665ac1fff).  
PPP Magic-Number  
Block  
Uses a hexadecimal format with a maximum length of 40  
characters, and the length must be a multiple of 8.  
Valid characters: “0-9, a-f” (ex. AT%M3=b3c665acffff0001).  
5
Public Switched  
Network Directory  
Number  
Uses a normal telephone number with a maximum length of 15.  
Valid characters are “0-9, *, #.  
255 Accept Any Remote  
No address is used. This class is valid only for remote endpoint  
Endpoint Discriminator discriminators (EPDs), and is used to accept any remote EPDs  
received that are all part of the same bundle.  
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Always On / Dynamic ISDN AT Commands  
The following table describes the Always On / Dynamic ISDN AT commands.  
AT!X1=n  
X.25 Version. Specifies the X.25 version you are using. There are two X.25 CCITT  
recommendations available for selection, 1984 and 1988. This information is  
provided by your Service Provider and should match the X.25 recommendation  
supported on the switch you are connecting to.  
n=0 1984 (default).  
n=1 1988.  
AT!X2=n  
X.25 DTE Address. Specifies the X.25 DTE address. An X.25 DTE Address identifies a  
node on an X.25 network. Every X.25 node has an X.25 address. Your Service provider  
assigns this value at subscription time.  
This number is your 7, 10, or 11 digit X.25 Directory number (11=with leading 1). For  
example, if 214-111-1234 is your DN, the following combinations are possible:  
AT!X2=1111234  
AT!X2=2141111234  
AT!X2=12141111234  
Maximum Length: 5 digits; digits can be from 0-9 inclusive.  
Default: none.  
AT!X3=n  
X.25 Facilities. Specifies the X.25 facilities that are to be included each time a call is  
made.  
X.25 facilities are optional network services that let you perform tasks such as  
reversing charges on your calls, accessing a Close User Group, or specifying a  
Network User Identification (NUI).  
Enter facilities as hexadecimal octets (eight-bit bytes).  
For example, if your X.25 long distance provider is AT&T (AT&T=3134), you should  
specify AT!X3=443134. To specify a Throughput Class of 9600, enter AT!X3=02AA (or  
in Canada enter AT!X3=02aa420707430707).  
Maximum Length = 28 characters; characters can be any combination of numbers  
from 0 to 9, and letters from A to F (lower and upper case). Default: none.  
AT!X4=n  
Local ISDN Prefixes. Specifies the local ISDN prefixes to be used on phone numbers  
received with BACP enabled.  
For example, AT!X4=9 will place a 9 in front of the number you are dialing for  
situations where you need to dial 9 for an outside line (PBX). AT!X4=1 will place a 1 in  
front of the number in situations where you are making a long distance call. Default:  
none.  
Max Length: 9 characters. Characters can be numbers in the range 0 to 9, or the  
* and # symbols.  
AT!X5=n  
X.25 Default Window Size. Specifies the X.25 default window size. This is the  
window size used if no window size is specified in the X.25 Facilities field when a call  
is made.  
Default: 2.  
Window sizes of 1 to 7 are standard. A value of 0 is not allowed.  
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Always On / Dynamic ISDN AT Commands  
AT!X6=n  
X.25 Maximum Window Size. Specifies the X.25 maximum window size. It is  
sometimes desirable to have a large window size. This is particularly true for satellite  
networks that have significant transmission delays.  
Maximum window size can never be exceeded. If a larger window size is requested  
when the call is established (through X.25 Facilities field), it is negotiated downward  
so that the maximum window size is respected.  
Default: 7.  
Use a value that is greater than or equal to the default window size.  
AT!X7=n  
AT!X8=n  
X.25 Default Packet Size. Specifies the X.25 default packet size. This packet size is  
used if no packet size is specified in the X.25 facilities field when a call is made.  
Values: 16, 32, 64, 128, 256, 512, 1024, 2048, 4096.  
Default: 128.  
X.25 Maximum Packet Size. Specifies the X.25 maximum packet size. Maximum  
packet size can never be exceeded. If a larger packet size is requested when the call is  
established, it will be negotiated downward so that the maximum packet size is  
respected.  
Use a value that is greater than or equal to the default packet size.  
Values: 16, 32, 64, 128, 256, 512, 1024, 2048, 4096.  
Default: 256.  
AT!X9=n  
Terminal Endpoint Identifier (TEI). Specifies the TEI used for X.25 over the  
D-channel. Your service provider assigns this value. Possible values are 0 to 63  
inclusive.  
Default: 21.  
AT!X10=n  
Delay Before Opening 1st B-channel. Specifies the amount of time (in seconds) the  
throughput on your D-channel must exceed the Opening Threshold (AT!X11=n)  
before the 1st B-channel is added to the AO/DI connection.  
For example, if you specify 5 seconds, and the Opening Threshold is 70%  
(AT!X11=70), once the throughput on the D-channel reaches 70%, there will be a  
delay of 5 seconds before the 1st B-channel is added to the AO/DI connection. If the  
throughput drops below 70% during the 5 seconds, the 1st B-channel will not be  
added to the connection.  
Range: 0 to 65535.  
Default: 5 seconds.  
AT!X11=n  
AT!X12=n  
1st B-channel Opening Threshold. Specifies the threshold (percentage) that the  
throughput on your D-channel must exceed before the 1st B-channel is added to the  
AO/DI connection.  
Range: 0 to 100.  
Default: 70.  
1st B-channel Closing Threshold. Specifies the threshold (percentage) that the  
throughput on your B-channel must be below before the 1st B-channel is dropped  
from the AO/DI connection.  
Range: 0 to 100.  
Default: 40.  
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Always On / Dynamic ISDN AT Commands  
AT!X13=n  
Delay Before Opening 2nd B-channel (with BACP enabled). Specifies the amount  
of time (in seconds) the throughput on your 1st B-channel must exceed the Opening  
Threshold (AT!X14=n) before the 2nd B-channel is added to the AO/DI connection.  
For example, if you specify 5 seconds, and the Opening Threshold is 70%  
(AT!X14=70), once the throughput on the 1st B-channel reaches 70%, there will be a  
delay of 5 seconds before the 2nd B-channel is added to the AO/DI connection. If the  
throughput drops below 70% during the 5 seconds, the 2nd B-channel will not be  
added to the connection.  
Range: 0 to 65535.  
Default: 5 seconds. Note that if the ISDN Switch Type is set to Singapore (AT!C1=6)  
then the default is 60 seconds.  
Note: The description above applies only if BACP is enabled; for a description of  
AT!X13=n when BACP is disabled, see page 47.  
AT!X14=n  
AT!X15=n  
AT!X16=n  
2nd B-channel Opening Threshold. Specifies the threshold (percentage) that the  
throughput on your 1st B-channel must exceed before the 2nd B-channel is added to  
the AO/DI connection.  
Range: 0 to 100.  
Default: 70.  
2nd B-channel Closing Threshold. Specifies the threshold (percentage) that the  
throughput on your 2nd B-channel connection must be below before the 2nd  
B-channel is dropped from the AO/DI connection.  
Range: 0 to 100.  
Default: 40.  
Strips Area Code from Numbers. Tells BACP to drop the area code from phone  
numbers received from the remote peer.  
For example, if you are dialing a number with the same area code, if you specify  
AT!X16=1, the area code is dropped from the number.  
n=0 Off (default).  
n=1 On.  
AT!X17=n  
Specify X.25 Transmit Queue Threshold. When the queued data goes over this  
limit, for the period of time specified with AT!X10, the 1st B-channel will be added to  
the AO/DI connection.  
For example, if 1000 bytes are queued in the X.25 link, the 1st B-channel connection  
will be opened after the delay specified by AT!X10.  
Range: 0 to 65535  
Default: 1000 bytes.  
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Always On / Dynamic ISDN AT Commands  
AT!X18  
AT!X19  
AT!X20  
Set Normal Mode for Bandwidth on Demand. Sets the Bandwidth on Demand  
thresholds and delays to pre-configured values. ‘Normal Mode’ is equivalent to the  
default values for each setting, and is defined as follows:  
AT!X10=5  
AT!X11=70  
AT!X12=40  
AT!X13=5  
AT!X14=70  
AT!X15=40  
Sets ‘Delay before Opening 1st B-channel’ to 5 seconds.  
Sets ‘1st B-channel Opening Threshold’ to 70 seconds.  
Sets ‘1st B-channel Closing Threshold’ to 40 seconds.  
Sets ‘Delay before Opening 2nd B-channel’ to 5 seconds.  
Sets ‘2nd B-channel Opening Threshold’ to 70 seconds.  
Sets ‘2nd B-channel Closing Threshold’ to 40 seconds.  
AT!X17=1000 Sets the ‘X.25 Transmit Queue Threshold’ to 1000 bytes.  
Set Economy Mode for Bandwidth on Demand. Sets the Bandwidth on Demand  
thresholds and delays to pre-configured values. ‘Economy Mode’ is defined as  
follows:  
AT!X10=20  
AT!X11=80  
AT!X12=60  
AT!X13=60  
AT!X14=60  
AT!X15=80  
Sets ‘Delay before Opening 1st B-channel’ to 20 seconds.  
Sets ‘1st B-channel Opening Threshold’ to 80 seconds.  
Sets ‘1st B-channel Closing Threshold’ to 60 seconds.  
Sets ‘Delay before Opening 2nd B-channel’ to 60 seconds.  
Sets ‘2nd B-channel Opening Threshold’ to 60 seconds.  
Sets ‘2nd B-channel Closing Threshold’ to 80 seconds.  
AT!X17=2000 Sets the ‘X.25 Transmit Queue Threshold’ to 2000 bytes.  
Set Performance Mode for Bandwidth on Demand. Sets the Bandwidth on  
Demand thresholds and delays to preconfigured values. ‘Performance Mode’ is  
defined as follows:  
AT!X10=1  
AT!X11=50  
AT!X12=20  
AT!X13=1  
AT!X14=60  
AT!X15=80  
Sets ‘Delay before Opening 1st B-channel’ to 1 second.  
Sets ‘1st B-channel Opening Threshold’ to 50 seconds.  
Sets ‘1st B-channel Closing Threshold’ to 20 seconds.  
Sets ‘Delay before Opening 2nd B-channel’ to 1 second.  
Sets ‘2nd B-channel Opening Threshold’ to 60 seconds.  
Sets ‘2nd B-channel Closing Threshold’ to 80 seconds.  
AT!X17=500 Sets the ‘X.25 Transmit Queue Threshold’ to 500 bytes.  
AT!X21=n  
AT!X22=n  
Specify Lowest X.25 Logical Connection Number. Specifies the lowest LCN that  
X.25 will use for establishing the AO/DI connection.  
Range: 1 to 4095. If you specify more than 1 LCN (using AT!X25), the upper limit of the  
range is 4095 minus the number of LCNs. For example if AT!X25=4, then the upper  
limit of the range is 4095-4 = 4091.  
Default: 1.  
Enable/Disable AO/DI. Specifies whether the AO/DI feature is enabled or disabled.  
n=0 Off (default).  
n=1 On.  
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Always On / Dynamic ISDN AT Commands  
AT!X25=n  
AT!X26=n  
Specify Number of Logical Connection Numbers. Note that the number of Logical  
Connection numbers affects the range ofAT!X21. SeeAT!X21.  
Range: 1-4.  
Default: 1.  
Specify Type of User Data for X.25 Call Request Packet. Specifies the type of user  
data for X.25 call requests. Normally, the value of this parameter should be left to the  
default CF (PPP over X.25). If your switch doesn't recognize CF, you won't be able to  
connect; if this is the case you should set the value to nothing (AT!X26= ).  
Default: CF (PPP over X.25).  
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Utility Commands  
The following table describes the Utility Commands.  
AT$CP=n  
Enable / disable compression.  
n=0 Disable  
n=1 Enable (default)  
AT$EX  
AT$In  
View Internal ExPrintf log buffer.  
On Demand SPID Testing (North America only). Lets you test SPIDs on demand.  
n=<SPID Number>  
Tests the specified SPID. To perform this test you must be connected to National ISDN  
or AT&T 5ESS Custom interface. The test is only supported if neither logical channel is  
initialized (either with a SPID or in NIT mode). If required, clear the SPID and disable NIT  
mode for both channels, then reset the device. You can then run two SPID tests (further  
tests will be rejected).  
n=<blank>  
Retrieves any AutoSPID data downloaded during location detection. Note that this  
command does not initiate the AutoSPID procedure; it simply retrieves historical data.  
The following string of information is displayed:  
[SPID number, Directory Number, call type, error code]  
Call type is indicted by the following codes: v=voice, d=data, p=packet.  
Note: If AutoSPID cannot detect Directory Numbers and call types, these fields will be  
empty. If an AutoSPID download has not been performed, no information will be  
retrieved.  
AT$IG  
AT$Rn  
SPID guessing (North America only). Specifies that the DIVA T/A should attempt SPID  
guessing. When the command is entered, the DIVAT/A will attempt to guess the SPID  
for each B-channel. If SPID initialization is successful, the SPID number is displayed and  
saved automatically.  
If a datalink problem is encountered during SPID guessing, the guessing is aborted and  
the message “No Carrier” is displayed.  
Fatal Error Reset.  
n=0 Do not reset on software fatal error, stay in the monitor (default)  
n=1 Reset unit on software fatal error  
Note: Use the AT&W command to save the parameter permanently.  
AT$SL  
AT$SM  
AT$SP  
AT$SQ  
AT$SX  
AT$VCn  
AT$VI  
Stop LAPD Trace.  
Stop Mail Trace.  
Stop PPP Trace.  
Stop Q931 Trace.  
Stop AO/DI X.25 Trace.  
Set an AT cmd Trace.  
View initial Profile. Displays the profile used at start up.  
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Utility Commands  
AT$VL  
Start or display the Result of a LAPD trace.  
You can specify the total size of the trace buffer and the length of each trace entry. Use  
the following syntax:  
AT$VL [trace size, entry length], where trace size and entry length are specified in  
hexadecimal values.  
For example, to specify a trace size of 32K and an entry length of 256 bytes, enter: AT$VL  
8000, 100.  
If you do not specify trace size and length, the default values are used. The default trace  
size is 16K, the default entry length is 128 bytes.  
AT$VM  
Controls the internal Mail Trace. Your Eicon Technology Customer Services  
representative may ask you to use this command.  
Format is:  
AT$VM [total size, entry_size, filter] (parameters are optional)  
Example:  
AT$VM  
starts mail trace with default size of 16K, entry_size of 64 bytes, no filter  
to pause the mail trace  
AT$VM -p  
AT$VM -r  
AT$VM -s  
to reset the mail trace  
to restart the mail trace  
AT$VP  
AT$VQ  
AT$VU  
Start or Display the Result of a PPP trace.  
You can specify the total size of the trace buffer and the length of the each trace entry.  
Use the following syntax:  
AT$VP [trace size, entry length], where trace size and entry length are specified in  
hexadecimal values.  
For example, to specify a trace size of 32K and an entry length of 256 bytes, enter: AT$VP  
8000, 100.  
If you do not specify trace size and length, the default values are used. The default trace  
size is 16K, the default entry length is 128 bytes  
Start or Display the Result of a Q931 trace.  
You can specify the total size of the trace buffer and the length of the each trace entry.  
Use the following syntax:  
AT$VQ [trace size, entry length], where trace size and entry length are specified in  
hexadecimal values.  
For example, to specify a trace size of 32K and an entry length of 256 bytes, enter: AT$VQ  
8000, 100.  
If you do not specify trace size and length, the default values are used. The default trace  
size is 16K, the default entry length is 128 bytes.  
Internal TA access command reserved for VU.  
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Utility Commands  
AT$VX  
Start an AO/DI X.25 Trace.  
You can specify the total size of the trace buffer and the length of the each trace entry.  
Use the following syntax:  
AT$VX [trace size, entry length], where trace size and entry length are specified in  
hexadecimal values.  
For example, to specify a trace size of 32K and an entry length of 256 bytes, enter: AT$VX  
8000, 100.  
If you do not specify trace size and length, the default values are used. The default trace  
size is 16K, the default entry length is 128 bytes.  
AT$Y  
AT$Z  
Enter the monitor on the next reset.  
Soft reset the unit and enter the monitor.  
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S-Register Commands  
The following five commands apply to S-Registers, which are described further below.  
ATSn=v  
ATSn  
S-Register n to Value v. Sets S-Register n to the value v.  
Establishes S-Register n as the Selected Register. Sets S-Register n as the last  
register accessed, where n is the number identifying the S-Register. For example,  
ATS7 establishes S7 as the last accessed register.  
ATSn?  
AT=n  
AT?  
Reports the Value of S-Register n. Reports the last value stored into S-Register n. If  
n is omitted, the last S-Register is accessed.  
Last Accessed S-Register to Value v. Use this command to set the last accessed  
S-Register to the new value n.  
View Last Accessed S-Register. Displays the contents of the “selected” S-Register.  
The “selected” S-Register is the last S-Register that was accessed using an S-Register  
command, or selected with the ATSn command.  
S Register Parameters  
Register  
Description  
S0  
Enable/Disable Auto-answer. Specifies whether auto answer is enabled or disabled.  
Setting a value other than “0” instructs the DIVA T/A to auto-answer after n rings. A  
value of “0” instructs the DIVAT/A to disable the auto-answer mode. Type: Storable.  
v=0  
No auto answer (default).  
v=1-255 Answers after this number of rings  
S1  
S2  
View Ring Count. Specifies number of rings.  
Default: 0. Type: Non-Storable.  
Note: This register is reset to 0 if 8 seconds elapse since receipt of the previous ring.  
Escape Sequence Character. Specifies the character used to escape from the data  
mode and return to the AT command mode.  
Range: 0 to 255. Type: Storable.  
Default: ASCII 043, translates into the “+” character.  
S3  
S4  
S5  
Carriage Return Character. Specifies the character that the AT command processor  
uses to detect the end of a command line in both the receive and transmit directions.  
Range: 0 to 127. Type: Non-Storable.  
Default: ASCII 013 which translates into the carriage return character.  
Line Feed Character. Specifies the character that the AT command processor uses to  
indicate the end of each status message.  
Range: 0 to 127. Type: Non-Storable.  
Default: ASCII 010 line feed.  
Backspace Character. Specifies the backspace character used for command line  
editing.  
Default: ASCII 008 (backspace). Type: Non-Storable.  
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S-Register Commands  
Register  
Description  
S25  
Data Terminal Ready Detection Delay. Specifies the duration that the Data  
Terminal Ready (DTR) status must either be raised or dropped before being  
recognized by the DIVA T/A. This delay helps ensure that the DIVAT/A does not  
interpret a random glitch as a DTR raise or drop.  
This register affects the AT&Dn command, which controls interpretation of the Data  
Terminal Ready (DTR) input (see page 37). Essentially, detection by AT&Dn will be  
delayed according to the S25 register setting.  
Range: 0-255, in tenths of a second. For example, if set to 5, the duration is five-tenths  
of a second, or 50 milliseconds.  
Default: 0. Type: Storable.  
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Analog Device Commands  
The following table describes the analog device commands. These commands are only  
available on units with the optional analog device ports.  
AT*An=v  
Abbreviated Ring Control (North America only). Specifies whether Visual Message  
Waiting's abbreviated ring is enabled or disabled.  
n=1 Analog device port 1 (PHONE 1).  
n=2 Analog device port 2 (PHONE 2).  
v= 0 Disabled.  
v=1 Enabled (default).  
AT*Bn=v  
ISDN Bearer Capability. Specifies the bearer capability for ISDN calls on the analog  
device interface.  
n=1 Analog device port 1 (PHONE 1).  
n=2 Analog device port 2 (PHONE 2).  
v=0 Outgoing analog device calls use Speech encoding (default).  
v=1 Outgoing analog device calls use Audio 3.1Khz encoding. This setting is  
recommended for modem/fax calls.  
Note: This parameter does not take effect until you restart your DIV AT/A.  
AT*Cn  
Analog Device Caller ID Delivery. Specifies whether analog device caller ID delivery  
isenabled ordisabled (North America only).When enabledtelephoneswith Call Display  
will display incoming call information.  
n=0 Disable analog device caller ID delivery.  
n=1 Enable analog device caller ID delivery (default).  
Note: This parameter does not take effect until you restart your DIV AT/A.  
AT*Dn=v  
Internal Dial Access. Controls the internal dial access for supplementary services.  
n=1 Analog device port 1 (PHONE 1).  
n=2 Analog device port 2 (PHONE 2).  
v=0 Disable internal dial access. This setting is recommended for modem/fax calls.  
v=1 Enable internal dial access (default).  
Note: This parameter does not take effect until you restart your DIV AT/A.  
AT*En=v  
Enable/disable Incoming and Outgoing Calls. Specifies the type of calls (outgoing  
and incoming) permitted on an Analog Port. Each Analog port can be set  
independently.  
n=1 Analog device port 1 (PHONE 1).  
n=2 Analog device port 2 (PHONE 2).  
v=0 Disable port.  
v=1 Outgoing calls only.  
v=2 Incoming calls only.  
v=3 Incoming and outgoing calls (default).  
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Analog Device Commands  
AT*Fn  
Analog Device Ring Frequency. Specifies the analog device ring frequency. When  
n=0, the ring frequency is determined by the country/region selected with the AT*Pn  
command.  
n=0 Ring frequency determined by region (AT*Pn) (default).  
n=1 20 Hz.  
n=2 25 Hz.  
n=3 40 Hz.  
n=4 50 Hz.  
Note: This parameter does not take effect until you restart your DIV AT/A.  
AT*Kn=v  
Analog Device Calling Features (North America only). Specifies the feature key for  
analog device calling features.  
n=1 Conference Call  
n=3 Call Drop  
n=5 Message Waiting Indicator  
v=Any value in the range 0-65535 (the defaults are: Conference Call=60, Call  
Transfer=61, Call Drop=62, Message Waiting Indicator=63)  
Note: This parameter does not take effect until you restart your DIV AT/A.  
AT*M=v  
AT*Pn  
Visual Message Indicator Refresh Time (North America only). Specifies how  
frequently DIVA T/A should refresh the Visual Message Indicator. Setting v=0 disables  
Visual Message Indicator feature.  
Range of v= 1 to 60 (specify the time in minutes)  
Default: 30.  
It is recommended that this setting not be set to below 30 minutes.  
Analog Device Country Specific Parameters. Specifies the country for which certain  
parameters (ring pattern, ring frequency, pulse pattern, gains) are implemented.  
n=0 United States  
(default in North  
America)  
n=1 International  
(default outside  
North America)  
n=2 United Kingdom  
n=3 Belgium  
n=4 France  
n=8 Sweden  
n=9 Ireland  
n=10 Denmark  
n=11 Italy  
n=12 Norway  
n=13 Switzerland  
n=14 Austria  
n=15 Cyprus  
n=16 Finland  
n=17 Greece  
n=18 Iceland  
n=19 Luxembourg  
n=20 Portugal  
n=21 China  
n=22 Australia  
n=23 Hong Kong  
n=24 Singapore  
n=25 Canada  
n=26 India  
n=27 Japan  
n=28 South Africa  
n=29 United Arab  
Emirates (UAE)  
n=5 Germany  
n=6 Netherlands  
n=7 Spain  
Note: This parameter does not take effect until you restart your DIV AT/A.  
AT*Rn=v  
Analog Device Alternate Ring. Specifies whether normal or distinctive ring is used.  
n=1 Analog device port 1 (PHONE 1).  
n=2 Analog device port 2 (PHONE 2).  
v=0 Normal Ring (default).  
v=1 Distinctive Ring.  
Note: This parameter does not take effect until you restart your DIV AT/A.  
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Analog Device Commands  
AT*Sn=v  
Disable Analog Device Calling Features. Specifies whether supplementary service is  
to be disabled.  
n=1 Analog device port 1 (PHONE 1).  
n=2 Analog device port 2 (PHONE 2).  
v=0 Disable. Recommended for modem/fax calls.  
v=1 Enable with default values (default).  
The following two options are for advanced users only.  
v=5 Enable using same terminal endpoint identifier as data port.  
v=9 Enable using separate terminal endpoint identifier.  
Note: This parameter does not take effect until you restart your DIV AT/A.  
AT*Vn=v  
Enable/Disable VoiceMail (North America Only). Specifies whether VoiceMail is  
enabled or disabled.  
n=1 Analog device port 1 (PHONE 1).  
n=2 Analog device port 2 (PHONE 2).  
v=0 Disable (default).  
v=1 Enable.  
Notes:  
• If v=0 is selected and voice mail is detected, DIVA T/A automatically enables VoiceMail.  
• If the SPID corresponding to an analog device port changes, the parameter will  
automatically be reset to 0. Also, if the DIVAT/A is reset to factory profile, the  
parameter is reset to 0.  
• This parameter does not take effect until you restart your DIV AT/A.  
AT*Wn=v  
Call Waiting Support (International version only). Specifies whether support for call  
waiting is enabled.  
n=1 Analog device port 1 (PHONE 1).  
n=2 Analog device port 2 (PHONE 2).  
v=0 Disable.  
v=1 Enable (default).  
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Mini-monitor Commands  
The following commands relate to the Mini-monitor. They are all case sensitive.  
Your Eicon Technology Customer Services representative may ask you to use these commands.  
at@dump  
Dump Memory. Produces a memory dump using XMODEM.  
Note: This command needs a terminal emulation program that supports XMODEM.  
at@d1  
at@d2  
at@d3  
at@d4  
at@fail  
at@load  
DRAM test.  
Flash test.  
ISDN internal loop back test.  
ISDN external loop back test.  
Simulate a fault.  
Load New Firmware.  
Note: This command needs a terminal emulation program that supports XMODEM or  
1K-XMODEM.  
at@md arg  
at@msg  
at@quit  
at>F  
Display memory (arg= “address:size”).  
Display cause for entering the monitor.  
Exit the Mini-monitor.  
Restore All Profiles to Original Factory Settings. Reverts the powerup profile to  
number 0.  
Warning: All previous user-defined settings are lost.  
DIVA T/A ISDN Modem Reference Guide N Page 62  
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AT Command Result Codes  
This section provides the result codes, also known as status messages, that are displayed  
after an AT command is issued.  
Result codes can be displayed as a word message (long-form English) or as a number code  
(short-form numeric response). Word messages are preceded and terminated by the  
sequence <CR> <LF>. Numeric codes are terminated by <CR> only. The Result Code Format  
command (ATVn) determines short- or long-form usage.  
General Purpose Codes  
Some number codes can be associated with more than one text string, depending on the  
format selected by ATXn.  
Code  
Word Message(s)  
Description  
0
OK  
The DIVA T/A has successfully executed your command  
2
RING  
Incoming ringing is detected on the line  
Calling number displayed  
RING  
FROM: Calling  
RING(cip) called;calling  
NO CARRIER  
Called, and calling number displayed  
3
4
Attempt to establish a connection failed  
Connection ended  
ERROR  
Syntax of command is incorrect  
Unable to execute command  
Command does not exist  
Entered command is outside permitted range  
+F4  
6
+FCERROR  
NO DIALTONE  
NO CARRIER  
ISDN not initialized  
Remote user busy  
7
BUSY  
NO CARRIER  
8
NO ANSWER  
FAX  
Remote user not responding  
33  
35  
Fax call  
DATA  
Data call  
AT Result Codes - Connection Indicators  
The following codes give you information about your connection. The word “CONNECT” in a  
message can relate to either DCE speed or DTE speed, depending on the selection made with  
ATXn. The word “CARRIER” always relates to DCE speed.  
DIVA T/A ISDN Modem Reference Guide N Page 63  
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AT Command Result Codes  
DCE Speed means different things for different applications. For Digital calls, it is the bitrate  
obtained by summing all ISDN B-channels available to the protocol. For a V.110 call, it is the  
V.110 user rate and not the intermediate rate of the B-channel. For Modem over ISDN, it is the  
speed of the V.34 carrier.  
DTE Speed is the speed used between the PC and the T/A (default configured or last speed  
detected by the auto-bauding process). Some non-standard speeds (e.g. using certain  
divisors on a PC 8250 or 16550 UART) are not detected by the DIVA T/A and will not be  
correctly reported.  
Code  
Word Message  
1
CONNECT  
5
CONNECT 1200  
10  
11  
12  
13  
14  
15  
16  
17  
18  
19  
20  
21  
23  
40  
41  
46  
47  
48  
49  
50  
51  
52  
53  
CONNECT 2400  
CONNECT 4800  
CONNECT 9600  
CONNECT 7200  
CONNECT 12000  
CONNECT 14400  
CONNECT 19200  
CONNECT 38400  
CONNECT 57600  
CONNECT 64000  
CONNECT 115200  
CONNECT 230400  
CONNECT 512000  
CARRIER 300 CONNECT 300  
CARRIER 600 CONNECT 600  
CARRIER 1200 CONNECT 1200  
CARRIER 2400 CONNECT 2400  
CARRIER 4800 CONNECT 4800  
CARRIER 7200 CONNECT 7200  
CARRIER 9600 CONNECT 9600  
CARRIER 12000 CONNECT 12000  
CARRIER 14400 CONNECT 14400  
CARRIER 16800 CONNECT 16800  
DIVA T/A ISDN Modem Reference Guide N Page 64  
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AT Command Result Codes  
Code  
Word Message  
54  
CARRIER 19200 CONNECT 19200  
55  
56  
57  
58  
59  
60  
61  
62  
63  
64  
65  
66  
67  
70  
73  
79  
80  
83  
84  
85  
86  
89  
90  
CARRIER 21600 CONNECT 21600  
CARRIER 24000 CONNECT 24000  
CARRIER 56000 CONNECT 56000  
CARRIER 28800 CONNECT 28800  
CARRIER 64000 CONNECT 64000  
CARRIER 128000 CONNECT 128000  
CARRIER 26400 CONNECT 26400  
CARRIER 31200 CONNECT 31200  
CARRIER 33600 CONNECT 33600  
CARRIER 75T/1200R CONNECT 75T/1200R  
CARRIER 1200T/75R CONNECT 1200T/75R  
CARRIER 112000 CONNECT 112000  
CARRIER 38400 CONNECT 38400  
PROTOCOL: NONE  
PROTOCOL: V42  
PROTOCOL: MNP REL  
PROTOCOL: MNP ALT  
PROTOCOL: V120  
PROTOCOL: V110  
PROTOCOL: PPPC  
PROTOCOL: MLPPP  
PROTOCOL: TRV  
PROTOCOL: TRANSPARENT MODE  
DIVA T/A ISDN Modem Reference Guide N Page 65  
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Index  
A
H
Alphabetical list of supported AT commands, 17  
Always On / Dynamic ISDN (AO/DI), 12  
Analog commands, 59  
AO/DI commands, 49  
AT commands  
H-Channel, 7  
I
ISDN, 4  
ISDN Communication Channels, 6  
ISDN configuration commands, 31  
Alphabetical list, 17  
Analog, 59  
AO/DI, 49  
AT!, 18  
L
AT$ (utility), 27  
AT%, 20  
Locating AT Commands, 14  
AT&, 21  
AT*, 22  
M
Mini-monitor commands, 62  
Multilink PPP, 9  
Multilink PPP commands, 46  
AT>, 23  
AT@, 24  
Call control, 39  
COM port configuration, 36  
General, 29  
P
PRI, 8  
Group list, 16  
ISDN configuration, 31  
Mini-monitor, 28, 62  
Multilink PPP, 46  
Other, 25  
Profile, 45  
Result codes, 63  
S-Register, 57  
S-Registers, 26  
Syntax conventions, 14  
Utility, 54  
Primary Rate Access, 8  
Profile commands, 45  
R
Result codes, 63  
S
S-Register commands, 57  
Syntax conventions for AT commands, 14  
V.110, 44  
V.120, 42  
U
Utility commands, 54  
B
BACP/BOD, 10  
Basic Rate Access, 8  
B-Channel, 6  
BRI, 8  
V
V.110 commands, 44  
V.120 commands, 42  
C
Call control commands, 39  
COM port configuration commands, 36  
Connecting to ISDN, 8  
D
Data Compression, 13  
DBA, 11  
D-Channel, 6  
G
General AT commands, 29  
DIVA T/A ISDN Modem Reference Guide N Page 66  
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