Cisco AS5300 Series Software

Table Of Contents

AT Command Set and Register Summary for V.34, 56K, and V.90 12-Port Modules

Entering AT Commands

Alphabetic Command Set

A (Answer)

A/ (Repeat Last Command)

AT (Attention)

Bn (ITU/Bell Mode)

D {dial string} (Dial)

Dial Modifiers

En (Command Echo)

H (Hang Up)

In (Identification)

On (Enter Connect State)

Qn (Quiet)

Sn? (Read Configuration Register)

T (Tone Dial)

Vn (Result Code Form)

Wn (Connection Speed Reporting)

Xn (Extended Result Codes)

Yn (Long Space Disconnect)

Z (Reset)

Caret Command Set

^H (Host Port Upgrade)

^V (Display Bootstrap Revision)

Dollar Command Set

$Bn (Serial Port Bps Rate)

$D (Power-Up Diagnostics)

Percent Command Set

%An (Autoreliable Fallback Character)

%Bn (Modem Port Bps Rate)

%Cn (Compression Control)

%Dn (Disconnect Buffer Delay)

%En (Autoretrain)

%Fn (V.23 Mode)

%Gn (Independent Serial Port and Modem Port Speed)

%Ln (Speed Matching)

%M (Modulation)

%Mn (Modulation Selection)

%Rn (Read All Registers)

%Un (Clear Serial Port Speed)

%V (Display Modem Firmware Version)

Ampersand Command Set

&Cn (Serial Port DCD Control)

&Dn (DTR Control)

&F (Restore Command Defaults)

&Gn (Guard Tone)

&Pn (Dial Pulse Ratio)

&Sn (DSR Options)

&Tn (Diagnostic Test Mode)

&W (Store Current Configuration)

Parenthesis Command Set

)Mn (Power Level Adjustment for Cellular Telephone Connections)

Asterisk Command Set

*I (Modem Identifier)

*W (Store Complete Configuration)

Hyphen Command Set

-D{dial string} (Repeat Dial)

-En (Modem Port Data Length)

-Hn (Dumb Mode)

-In (Country Code)

Changing Country Codes on Microcom Modems

Configure

Verify

-Jn (Detect Phase)

-Kn (MNP Extended Services)

-Mn (MNP Class Connect Messages)

-On (Serial Port Parity)

-Pn (Check Parity)

-Qn (Fallback Modulation Speed)

-V (Split Modem Port Speed with Multiprotocol Autoanswer)

Colon Command Set

:Dn (Manual Dial)

:En (Compromise Equalizer)

:Tn? (Read Configuration Register)

@Character Command Set

@Cn (CTR, DSR, and DCD Connect Message Control)

@E (Detailed Modem Call Status)

@Mn (Select Transmit Level for Cellular Connections)

@Un (Minimum Connection Speed)

Backslash Command Set

\An (Maximum MNP Block Size)

\Bn (Transmit Break)

\Cn (Autoreliable Buffer)

\Dn (Serial Port DSR/CTS Control)

\En (Data Echo)

\F (Display Stored Phone Numbers)

\Gn (Modem Port Flow Control)

\Jn (Bps Rate Adjust)

\Kn (Break Control)

\Nn (Operating Mode)

\Pn{dial string} (Store a Telephone Number)

\ Qn (Serial Port Flow Control)

\Rn (Serial Port Ring Indicator)

\Sn (Read Online Status)

\Tn (Inactivity Timer)

\Vn (Error Correction Result Code Form)

Connection Result Code Tables

\Wn (Split Serial Port Speed)

\Xn (XON/XOFF Passthrough)

# Character Command Set

#En (Answer Mode Escape Sequence)

Modem S and :T Register Summary

Read All Registers

Point to a New Reference Register

Read a Configuration Register

Change the Value of a Register

Display the Value of the Reference Register

Change the Value of the Reference Register

S Register Descriptions

S0 (Ring to autoanswer On)

S1 (Ring Counter)

S2 (Escape Code Character)

S3 (Carriage Return Character)

S4 (Line Feed Character)

S5 (Backspace Character)

S6 (Wait Before Dialing)

S7 (Wait for Carrier After Dial)

S8 (Pause Time for Dial Delay)

S9 (Carrier Detect Response Time)

S10 (Delay for Hangup After Carrier Loss)

S11 (DTMF Tone-Dialing Speed)

S12 (Escape Code Guard Time and Remote Access Attention Sequence Guard Time)

S14 (Bit-Mapped Register)

S16 (Bit-Mapped Register for Test Options)

S18 (Test Timer)

S21 (Bit-Mapped Register)

S22 (Bit-Mapped Register)

S23 (Bit-Mapped Register)

S25 (Delay to DTR and Asynchronous/Synchronous Time Delay)

S27 (Bit-Mapped Register)

:T Register Descriptions

:T0 (Timer for V.22 bis, V.22, and V.32 Modes During Multi-Protocol Answer)

:T3 (Timer for V.21 and V.23 Answer Tone Duration)

:T4 (Timer for Line Turnaround Delay and Carrier On)

:T6 (Timer for DCD Turn On Delay)

:T9 (Primary XON Flow Control Character)

:T10 (Primary XOFF Flow Control Character)

:T11 (Secondary XON Flow Control Character)

:T12 (Secondary XOFF Flow Control Character)

:T14 (Connect Message Delay Timer)

:T16 (CTS Turn On Delay Timer)

:T17 (V.32/V.32 bis Connection Training Timer)

:T19 (Bit-Mapped Register)

:T22 (DSR Timer)

:T23 (Bit-Mapped Register)

:T26 (Bit-Mapped Register)

:T51

:T52

:T89 (PoS Configuration)

:T110 (Select V.8 or V.8 bis Modem Exchange Register)

:T114 (56KFlex Control Register)

:T120 (Answerback Tone Duration)

:T121 (Answerback Tone Configuration for PoS)

:T124 (K56PLUS/V.90 Control)

:T127

Debugging

PoS Support

PoS Field Applications

Example of Modemcap Creation, Assignment, Audit

V.90 56K AT Command Set Support

%Mn

%M4

%M3

%M2

%M1

%M0

%Gn%Bn

Baud Rate Interaction Example

Cisco Connection Online

AT Command Set and Register Summary for V.34, 56K, and V.90 12-Port Modules

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April 25, 2002

This document describes AT commands and S and :T registers for the following universal access server modules:

•V.34 12-port module

–V.34 modulation, 28.8 kbps, firmware version 1.x.xx

–V.34 annex 12 modulation, 33.6 kbps, firmware version 2.x.xx

•56K 12-port module

–K56flex modulation, 56 kbps, firmware version 3.x.xx

•56K 12-port module

–K56flex and V.90 modulation, 56 kbps firmware version 5.x.xx

See "V.90 56K AT Command Set Support," page 86 for specific information pertaining to the AT command set which supports the K56flex and V.90 speeds. These commands are in support of firmware version 5.x.xx (use the show modem version command).

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Note Except where noted, this document lists defaults and descriptions for the latest firmware, that is version 3.2.20 (for 56K 12-port modules) and version 2.3.6 (for V.34 12-port modules). For defaults for previous firmware versions, see the universal access server modem firmware release notes, which are available on the World Wide Web at http://www.cisco.com, http://www-china.cisco.com, or http://www-europe.cisco.com.

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Note For Point of Sale (PoS) support, make sure that the 12-port board is running firmware version 3.2.10 or later (use the show modem version command).

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Note Customers using Cisco IOS Release 12.0(4)XI1 or higher will be prompted to use the Service Processing Element (SPE) command instead of the modem-pool command to download code. The modem-pool command will no longer be available, and the existing modem firmware configurations in the router will be converted to the new spe command format. See the Cisco document, SPE and Firmware Download Enhancements at the following URL for more information about the spe command:
http://www.cisco.com/univercd/cc/td/doc/product/software/ios120/120newft/120t/120t7/spe1206t.htm

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If you have questions or need help, refer to the last section "Cisco Connection Online" for further information.

This document contains the following sections:

•Entering AT Commands

•Alphabetic Command Set

•^ Caret Command Set

•$ Dollar Command Set

•% Percent Command Set

•& Ampersand Command Set

•) Parenthesis Command Set

•* Asterisk Command Set

•- Hyphen Command Set

•: Colon Command Set

•@Character Command Set

•\ Backslash Command Set

•# Character Command Set

•Modem S and :T Register Summary

•S Register Descriptions

•:T Register Descriptions

•PoS Support

•Cisco Connection Online

Entering AT Commands

Keep in mind the following guidelines when you send AT commands to a modem:

•Entering AT command mode involves two main configuration tasks: configuring a manageable modem to permit a direct-connect session and then establishing the session. Table 1 describes all the steps necessary to enter AT command mode on the access server.

Table 1 AT Commands

Step	Command	Purpose
1	access server> enable Password: <password> access server#	Enter privileged EXEC (enable) mode. Enter the password. You have entered privileged EXEC mode when the access server# prompt appears.
2	access server# config term Enter configuration commands, one per line. End with CNTL/Z. access server(config)#	Enter global configuration mode. You have entered global configuration mode when the access server(config)# prompt appears.
3	access server(config)# line 1 access server(config-line)#	Enter line configuration mode. In this example, line 1 is specified. You have entered line configuration mode when the access server(config-line)# prompt appears.
4	access server(config-line)# modem at-mode-permit	Configure a manageable modem to permit a direct-connect session.
5	access server(config-if)# end access server# %SYS-5-CONFIG_I: Configured from console by console <Return> access server#	Return to privileged EXEC mode. When this message appears, press Return to get the access server# prompt.
6	access server# modem at-mode 1/1 You are now entering AT command mode on modem (slot 1 / port 1). Please type CTRL-C to exit AT command mode.	Enter a direct-connect session with a modem. In this example, a direct-connect session is established with the modem in slot 1, port 1. Enter the modem slot number first, followed by the modem port number. Now you are in AT command mode and can enter the AT commands described in this document.
7	<Ctrl> <c> access server#	When you are finished entering AT commands, press Ctrl-C to exit AT command mode and return to privileged EXEC mode.

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Note ATA, ATO, ATD, and all dial modifiers are not valid in direct-connect sessions.

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•To exit a direct-connect session with a modem, press Ctrl-C.

•All commands except A/ (Repeat Last Command) and +++ (Escape Code) are preceded by the AT prefix and are executed when you press Return or Enter.

•Enter commands as either uppercase or lowercase, not mixed case.

•Commands are limited to 98 characters, not including the AT prefix, Return, and space characters.

•A missing numeric argument is assumed to be zero. For example, the Data Echo command \E is equivalent to \E0.

•The modem operates in one of two modes: idle state (no connection established with another modem) or connect state. Use the following commands to change operating states:

–To enter command state from connect state without breaking the connection, enter +++ (Escape Code) without pausing and do not press Return.

–To return to connect mode, enter AT0 and press Return.

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Note The default for the #E command is #E1, which means that the escape code sequence is disabled in answer mode. For more information, refer to the section, "# Character Command Set," on page 60.

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Alphabetic Command Set

This section describes modem commands that begin with an alphabetic (A to Z) character.

A (Answer)

Forces the modem off-hook in answer mode, regardless of the value of register S. If result codes are enabled, the workstation displays RING (long form) or 2 (short form) when it receives a call.

A/ (Repeat Last Command)

Reexecutes the last command one time. A/ is not preceded by the AT prefix and is not followed by a Return.

AT (Attention)

Informs the modem that commands are being sent to it. AT must precede all other commands except A/ and +++.

Bn (ITU/Bell Mode)

Selects the ITI-U/Bell connection mode used when connecting at 300 and 1200 bps. Bn is ignored when the modem port is set to other speeds. Table 2 lists command options.

Table 2 ITI-U/Bell Mode Command Options

Command	Meaning
B0	ITU V.22 standard at 300 and 1200 bps, international default1
B1	Bell 212A standard at 300 and 1200 bps, USA default1

1 Default is determined by country setting.

D {dial string} (Dial)

Dials a telephone number to establish a connection. The Dial command must be the last command on the command line. The dial string can contain up to 98 characters; valid characters are the digits 0 to 9, the dial modifiers listed in Table 3, and # and * for tone dialing. The modem ignores invalid characters; dial strings longer than 98 characters return an error. For example, to dial the telephone number 1 617 555 1234, enter the following command:

D 16175551234

To cancel the Dial command, press any key or set Data Terminal Ready (DTR) to off unless &D0 (DTR ignored) is set. After disconnect, there is a five-second delay before the modem is set off-hook in originate mode.

Dial Modifiers

The dial modifiers listed in Table 3 add conditions to the telephone number that you are dialing. You can use several dial modifiers with the same telephone number, and, unless otherwise noted, you can place dial modifiers anywhere in the dial string.

Table 3 Dial Modifiers

Modifier	Meaning
^A	Performs link negotiation at 4800 bps for this connection only. This dial modifier is equivalent to the *H2 command (link negotiation at 4800 bps).
J	Performs link negotiation at 1200 bps for this connection only. This dial modifier is equivalent to the *H1 command (link negotiation at 1200 bps).
K	Adjusts the power level for a single cellular connection.This option is used for modems attached to cellular interfaces.
L	Redials the last telephone number.
M	Dials in Link Access Procedure for Modem (LAPM) Mode for this connection only.
Nn	Dials an alternate stored number. This modifier must follow the last character in a dial string. If the modem fails to make a connection, the Nn modifier dials alternate telephone number n (where n is a number between 1 and 9) stored in the directory by the &Z or \Pn command (Store Telephone Number). If you do not enter a value for n, the modem dials the first stored entry. For example, to dial the third stored telephone number as an alternate telephone number, enter the following command and press Return: ATD 55554321N3 The Nn modifier can also be stored in the directory at the end of a dial string. If you do not specify a value for n and the modem fails to make a connection, it dials the number in the next position, even if it is null. Stored number 1 follows stored number 9. For example, to store a telephone number and an alternate number in directory entry 4, enter the following command and press Return: AT\P4 5551234N3
Q	Dials in LAPM mode for this connection only with fallback to normal mode.
R	Dials a number in answer mode when calling an originate-only modem. The modifier must follow the last character in the dial string. For example, to dial the telephone number 5552345 in answer mode, enter the following command and press Return: ATD 5552345R
S	Dials the telephone number stored as entry 1 with the &Z or \P1 command. The telephone number is displayed as it is dialed. The S modifier must immediately follow D in the dial command. You cannot add the S modifier to the phone number stored in the first directory position. For example, to dial the first stored telephone number, enter the following command and press Return: ATDS
T	Tone-dials the number. The last P or T dial modifier used remains in effect until you enter a new P or T modifier or reset the modem. You can combine P and T dial modifiers within a dial string. For example, to pulse-dial a local telephone number and tone-dial an access code and telephone number, enter the following command and press Return: ATD P12345 T335 6789
U	Dials in direct mode. The U modifier overrides the current operating mode and dials in direct mode for that connection only. For example, enter the following command and press Return: ATD 12345U
V	Dials in LAPM mode with fallback to MNP for this connection only. For example, enter the following command and press Return: ATD 12345V
W	Waits for dial tone before dialing. The W modifier is inserted between digits in a dial string. The modem then waits for the time specified in register S7. If it receives a dial tone before the time delay expires, it continues dialing; otherwise, it returns NO DIALTONE and hangs up. For example, enter the following command and press Return: ATD 12345 W 67890
X	Dials in autoreliable mode for this connection only. For example, enter the following command and press Return: ATD 12345X
Y	Dials in MNP reliable mode for this connection only. For example, enter the following command and press Return: ATD 12345Y
Z	Dials in normal mode for this connection only. For example, enter the following command and press Return: ATD 12345Z
/n	Dials one of the nine telephone numbers stored in the directory by the &Z or \Pn command (where n is a number between 1 and 9). The telephone number is displayed as it is dialed.
,	Pauses during dialing for the time specified in register S8 before dialing the next digit. Use more than one comma for a longer pause. For example, use the comma when you need to dial 9 and then wait for another dial tone before dialing an outside line: ATD 9,,5552345
@	Waits for quiet answer before dialing. This modifier is inserted between characters in a dial string. The modem waits for the time specified in register S7 for at least one ring, followed by 5 seconds of silence, before acting on the next character in the dial string. If the modem does not detect this sequence, it returns a NO ANSWER result code and hangs up. Use this modifier when the system you are calling does not provide a dial tone. For example: ATD 5551234 @ 43210
!	Sets the modem on-hook for one-half second and then back off-hook. This is equivalent to depressing the switch-hook button on your telephone.
;	Returns to command state after dialing. Add this modifier to the end of a dial string. The modem remains in command state after it dials the digits preceding the semicolon, so that you can enter dial strings longer than 98 characters. Each dial command except the last one must end with a semicolon. After the final dial command is entered, the modem tries to establish a connection. To abort dialing before attempting to establish a connection, enter the H command (Hang Up). For example: ATD 9,12345; OK ATD 78989 @ 12345 W 344

En (Command Echo)

Configures the modem to echo commands to the workstation. Table 4 lists command options.

Default

E1

Table 4 Command Echo Options

Command	Meaning
E0	Disables echoing commands to the workstation
E1	Enables echoing commands to the workstation

H (Hang Up)

Disconnects from the remote system and hangs up the telephone line. If the %Dn (Disconnect Buffer Delay) time is nonzero, the hangup can be delayed until the modem has transmitted all data in its transmit buffer.

In (Identification)

Displays modem information and results of checksum tests on firmware. Table 5 lists identification command options.

Table 5 Identification Command Options

Command	Meaning
I0	Displays the four-digit modem product code
I1	Runs a checksum on firmware ROM and displays the three-digit result
I2	Runs a checksum on firmware ROM and displays the checksum status
I3	Displays the modem name and revision level.

On (Enter Connect State)

Sets the modem to connect state. Table 6 lists command options.

Table 6 Connect State Command Options

Command	Meaning
O0	Enters connect state.
O1	Begins an equalizer retrain sequence when operating at 2400 bps or higher and then returns to connect state. Use the O1 command to reduce loss of equalization because of excessive bit error rates.

Qn (Quiet)

Configures the modem to send result and status codes, such as OK, BUSY, and RING, to your workstation. Table 7 lists command options.

Default

Q0

Table 7 Quiet Mode Command Options

Command	Meaning
Q0	Enables output of result codes.
Q1	Disables output of result codes.
Q2	Disables only answer mode result codes. Status report messages are not affected.

Sn? (Read Configuration Register)

Displays the contents of S register n (where n is a decimal number).

Range

0 to 27

Default

S0

T (Tone Dial)

Sets the current dialing mode to tone. This is the default dialing mode.

Vn (Result Code Form)

Selects the result code format sent to your workstation. The \Vn command (Error Correction Result Code Form) modifies the connect messages to reflect a reliable link connection. Table 8 lists command options.

Default

V1

Table 8 Result Code Form Command Options

Command	Meaning
V0	Sends short form result codes
V1	Sends long form result codes

Wn (Connection Speed Reporting)

Displays the serial port or modem port speed in connect messages. When the X0 command (Extended Result Codes) is set, CONNECT displays for any Wn command option. Table 9 lists command options.

Default

W2

Table 9 Connection Speed Reporting Command Options

Command	Meaning
W0	Displays serial port connect messages
W1	Displays serial port connect messages
W2	Displays modem port connect messages

Xn (Extended Result Codes)

Selects the extended result code format sent to the workstation. Table 10 lists command options.

The following commands also affect the result code format:

•The Vn command (Result Code Form) selects short or long form result codes.

•The \Vn command (Result Code Form) or -M1 command (MNP Class Connect Messages) must be set to indicate MNP reliable mode in the result code.

When the modem is set to ignore dial tone, it waits for the register S6 time delay and dials with or without a dial tone.

Default

X4

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Note The W dial modifier causes a wait for dial tone regardless of the Xn command setting.

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Table 10 Extended Result Code Command Options

Command	Meaning
X0	Sends a connect result code when a connection is established. The modem ignores dial tone and busy signals.
X1	Sends a connect result code reflecting the bps rate when a connection is established. The modem ignores dial tone and busy signals.
X2	Sends a connect result code reflecting the bps rate when a connection is established. The modem sends a NO DIALTONE result code if dial tone is not detected within 5 seconds of a dial attempt. The modem ignores busy signals.
X3	Sends a connect result code reflecting the bps rate when a connection is established. The modem sends a BUSY result code if a busy signal is detected. The modem ignores dial tone.
X4	Sends a connect result code reflecting the bps rate when a connection is established. The modem sends a NO DIALTONE result code if dial tone is not detected within 5 seconds of a dial attempt. The modem sends a BUSY result code if a busy signal is detected.

Yn (Long Space Disconnect)

Configures the modem to send a four-second Break on receipt of an H command (Hang Up). The answering modem disconnects if it receives the Break. This command is used only in normal and direct connections. Table 11 lists command options.

The four-second Break is also sent if Y1 and one of the following &Dn commands (Data Terminal Ready Control) are set:

•&D2 is set and DTR drops.

•&D3 is set and DTR drops. The sending modem disconnects after the Break.

Default

Y0

Table 11 Long Space Disconnect Command Options

Command	Meaning
Y0	Disables long space disconnect on receipt of an H command. The normal break signal is sent.
Y1	Enables long space disconnect on receipt of an H command. Y1 must be set on both modems for this command to take effect.

Z (Reset)

Hangs up the telephone line, clears the modem and the serial port buffers, and restores any settings stored with the &W or *W commands. If no settings are stored, the command restores the factory default (&F) settings.

Caret Command Set

This section describes modem commands that begin with a caret (^) character.

^H (Host Port Upgrade)

Copies new firmware from a computer file to the modem's Flash memory.

^V (Display Bootstrap Revision)

Displays the modem's current Flash memory bootstrap revision.

Dollar Command Set

This section describes modem commands that begin with a dollar ($) character.

$Bn (Serial Port Bps Rate)

Sets the serial port rate to n bps.

Range

300, 600, 1200, 2400, 4800, 9600, 19200, 38400, 57600, 115200 bps

Default

$B115200

$D (Power-Up Diagnostics)

Runs power-up diagnostics.

Percent Command Set

This section describes modem commands that begin with a percent (%) character.

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Note Modifications have been made to certain percent (%) AT commands as a result of enhancements made to the firmware version 5.0.4. Changes affect commands %B, %Gn, %G1, and %M.

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%An (Autoreliable Fallback Character)

Specifies the ASCII character recognized as the autoreliable fallback character on the answering modem. In autoreliable mode, when the modem encounters an incoming autoreliable fallback character from the remote system, it automatically switches to normal mode and passes the character to the serial port. Autoreliable fallback character recognition stops if the modem receives a SYN character (decimal 22). The \N3 (Operating Mode) and \C2 (Autoreliable Buffer) commands must also be set.

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Caution Do not use the settings n = 63 or n = 126. They interfere with V.42.

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Range

0 to 127 (ASCII decimal)

Default

%A0 (autoreliable fallback character is disabled)

%Bn (Modem Port Bps Rate)

Sets the modem port data rate. Downshifting can still occur.

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Note The user must always set %M before setting the %B option. Setting %M results in %B getting set to the maximum baud rate for that modulation. With AT%G0, setting %M will have no effect on %B. With AT%G1, setting %M will cause the %B to be set to the maximum value in that modulation. See %M (Modulation).

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The %Bn command is affected by the following %Gn command (Independent Serial/Modem Port Speed) options:

•If %G0 is sent locally, the modem port speed is matched to the serial port speed, regardless of any previous %Bn setting.

•If %G1 is set, the modem speed changes only when a %Bn command is entered.

Range

300, 600, 1200, 2400, 4800, 7200, 9600, 12000, 14400, 16800, 19200, 21600, 24000, 26400, 2800, 28800, 29333, 30666, 31200, 32000, 33333, 34000, 34666, 33600, 36000, 37333, 38000, 38666, 40000, 41333, 42000, 42666, 44000, 45333, 46000, 46666, 48000, 49333, 50000, 50666, 52000, 53333, 54000, 54666, 56000 bps

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Note Includes V.90 speeds

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Default

%B33600 for V.34 modems
%B56000  for 56 kbps modems

%Cn (Compression Control)

Sets the modem to use a data compression method in reliable connections. The recommended default command setting of %C3 allows the modem to establish a reliable connection using V.42 bis compression or MNP Class 5 Data Compression, depending on the capability of the remote modem.

If the remote modem does not support data compression or has data compression disabled, the modem can establish a noncompression connection with any %Cn setting.

Throughput is affected by the \Jn command (Bps Rate Adjust) options:

•\J0 (Disable Bps Rate Adjust) is recommended for the highest throughput.

•\J1 (Enable Bps Rate Adjust) causes the serial port to adjust to 9600 bps when a reliable connection is established at a speed from 2400 to 14400 bps. At 16800 bps or higher, the serial port speed adjusts to 19200 bps.

Default

%C3

Table 12 Compression Control Command Options

Command	Meaning
%C0	Disables data compression.
%C1	Enables MNP Class 5 data compression only.
%C2	Enables V.42 bis compression only.
%C3	Enables V.42 bis compression and MNP Class 5 Data Compression. The modem matches the capability of the remote modem.

%Dn (Disconnect Buffer Delay)

Specifies a delay time for the modem to process data in its transmit or receive buffers before disconnecting. When DTR transitions off or an H command (Hang Up) is entered, the modem attempts for n seconds to empty its transmit buffer before disconnecting. When carrier transitions off, the modem attempts for n seconds to empty its receive buffer before disconnecting. If the buffers are empty or if n = 0, the modem disconnects immediately.

If a physical disconnect occurs (for example, the connection is lost), only the receive buffer can be processed. If the delay expires before the modem empties its buffers, or if the modem is in command state at disconnect, data can be lost. The receive buffer may not empty before disconnecting if %E1 (Autoretrain) is set during normal mode connections at 2400 bps or higher.

Range

0 to 255 seconds

Default

%D0

%En (Autoretrain)

Sets the modem to resynchronize (autoretrain) up to three times (for a total of up to 6 seconds) before hanging up. The modem resynchronizes only for connection speeds of 2400 bps or higher. The %En command is ignored in V.32 communication. Table 13 lists command options.

Default

%E1

Table 13 Autoretrain Command Options

Command	Meaning
%E0	Disables the automatic retrain sequence. Use the O1 command (Enter Connect State) to force the retrain sequence when %E0 is set.
%E1	Enables the automatic retrain sequence at 2400 bps or higher.

%Fn (V.23 Mode)

Configures the modem for V.23 mode. Table 14 lists the V.23 command options.

Default

%F0

Table 14 V.23 Command Options

Command	Meaning
%F0	Allows multiprotocol answering; disables V.23 mode on the originate modem
%F1	75-bps transmit, 1200-bps receive (split speed) V.23 operation
%F2	1200-bps transmit, 75-bps receive (split speed) V.23 operation
%F3	1200-bps transmit, 1200-bps receive (half duplex) V.23 operation

%Gn (Independent Serial Port and Modem Port Speed)

Sets the modem port speed independent of the serial port speed. The modem port speed is set by the %Bn command (Modem Port Bps Rate). Table 15 lists command options.

Default

%G0

Table 15 Independent Serial and Modem Port Speed Command Options

Command	Meaning
%G0	Updates the serial and modem port speeds each time an AT command is entered. The serial port speed determines the modem port speed.
%G1	Updates the modem port speed only when a %Bn (Modem Port Bps Rate) command is entered.

The following tables list command strings for setting modem port speeds:

•Table 16 lists commands for modem protocols up to 14400 bps.

•Table 17 lists commands for V.34 modem port speeds up to 33600 bps.

•Table 18 lists commands for 56 kbps modem port speeds up to 56000 bps.

Table 16 Modem Protocol Commands

Protocol	%G0	%G1
V.21 (300 bps)	Using B0 at 300 bps	B0%B300
Bell 103 (300 bps)	Using B1 at 300 bps	B1%B300
V.22 (600 bps)	At 600 bps	%B600
V.22 (1200 bps)	Using B0 at 1200 bps	B0%B1200
Bell 212A (1200 bps)	Using B1 at 1200 bps	B1%B1200
V.22 bis (2400 bps)	At 2400 bps	%B2400
V.32 (4800 bps)	At 4800 bps	%B4800
V.32 (9600 bps)	At 9600 bps	%B9600
V.32 bis (14400 bps)	At 14400 bps	%B14400
V.FC (38800 bps)	At 28800 bps	%B28800

Table 17 V.34 Commands

When %M2 or %M3 Is Set:
V.34 Speed	%G1
2400 bps	%B24001
4800 bps	%B4800
7200 bps	%B7200
9600 bps	%B9600
12000 bps	%B12000
14400 bps	%B14400
16800 bps	%B16800
19200 bps	%B19200
21600 bps	%B21600
24000 bps	%B24000
26400 bps	%B26400
28800 bps	%B28800
31200 bps	%B31200
33600 bps	%B33600

1 In answer mode, this will result in V.22 bis connection.

When %M3 Is Set:
	56 kbps Speed	%G1
	32000 bps	%B32000
	34000 bps	%B34000
	36000 bps	%B36000
	38000 bps	%B38000
	40000 bps	%B40000
	42000 bps	%B42000
	44000 bps	%B44000
	46000 bps	%B46000
	48000 bps	%B48000
	50000 bps	%B50000
	52000 bps	%B52000
	54000 bps	%B54000
	56000 bps	%B56000

When %M4 Is Set:
	56 kbps Speed	%G1
	28000 bps	%B2800
	29333 bps	%B29333
	30666 bps	%B30666
	32000 bps	%B32000
	33333 bps	%B33333
	34000 bps	%B34000
	34666 bps	%B34666
	36000 bps	%B36000
	37333 bps	%B37333
	38000 bps	%B38000
	38666 bps	%B38666
	40000 bps	%B40000
	41333 bps	%B41333
	42000 bps	%B42000
	42666 bps	%B42666
	44000 bps	%B44000
	56 kbps Speed	%G1
	45333 bps	%B45333
	46000 bps	%B46000
	46666 bps	%B46666
	48000 bps	%B48000
	49333 bps	%B49333
	50000 bps	%B50000
	50666 bps	%B50666
	52000 bps	%B52000
	53333 bps	%B53333
	54000 bps	%B54000
	54666 bps	%B54666
	56000 bps	%B56000

%Ln (Speed Matching)

Configures the modem to use speed matching when establishing a connection. Table 18 lists command options.

Default

%L1

Table 18 Speed Matching Command Options

Command	Meaning
%L0	Provides partial speed matching
%L1	Enables speed matching
%L2	Disables speed matching
%L3	Enables V.8 automode with fallback to ITU-T1 automode
%L4	Enables V.8 automode only

1 International Telecommunications Union Telecommunication Standardization sector.

Modem Connection Modes Using Speed Matching

The following tables list connections the modem can establish with %L1 or %L3 set.

•Table 19—lists connections if a 56K modem in the access server originates the call.

•Table 20—lists connections if a 56K modem in the access server answers the call.

•Table 21—lists connections if a V.34 modem in the access server originates the call.

•Table 22—lists connections if a V.34 modem in the access server answers the call.

Table 19 56K Modem Originates Call

Mode Setting on Originating Access Server 56K Modem	Mode Setting on Answering Modem
	Bell 103	Bell 212A	V.22[b]	V.22[a]	V.22 bis	V.32	V.32 bis	V.FC	V.34	K56flex/ V.90
K56flex (32000-56000) V.90 (28000-56000)	-	V.22[a]	-	-	V.22 bis	V.32	V.32 bis	V.FC	V.34	K56flex1
V.34 annex 12- (31200-33600)		V.22[a]	-	-	V.22 bis	V.32	V.32 bis	V.FC	V.34	V.34
V.34 (2400-28800)	-	V.22[a]	-	V.22[a]	V.22 bis	V.32	V.32 bis	V.FC	V.34	V.34
V.FC (14400-28800)	-	V.22[a]	-	V.22[a]	V.22 bis	V.32	V.32 bis	V.FC	V.FC	V.FC2
V.32 bis (4800-14400)	-	V.22[a]	-	V.22[a]	V.22 bis	V.32	V.32 bis	V.32 bis	V.32 bis	V.32 bis
V.32 (4800-9600)	-	V.22[a]	-	V.22[a]	V.22 bis	V.32	V.32	V.32	V.32	V.32
V.22 bis (2400)	-	V.22[a]	-	V.22[a]	V.22 bis	V.22 bis	V.22 bis	V.22 bis	V.22 bis	V.22 bis
V.22[a] (1200)	-	V.22[a]	-	V.22[a]	V.22[a]	V.22[a]	V.22[a]	V.22[a]	V.22[a]	V.22[a]
V.22[b] (600)	-	-	V.22[b]	-	-	-	-	-	-	-
V.23[a] (xmt 75)	-	-	-	V.23[b]	V.23[b]	V.23[b]	V.23[b]	V.23[b]	V.23[b]	V.23[b]
V.23[b] (xmt 1200)	-	-	-	-	-	-	-	-	-	-
V.21(75-300)	-	V.22[a]	-	V.21	V.21	V.21	V.21	V.21	V.21	V.21
Bell 212A (1200)	Bell 212A	Bell 212A	-	V.22[a]	V.22[a]	V.22[a]	V.22[a]	V.22[a]	V.22[a]	V.22[a]
Bell 103 (300)	Bell 103	Bell 103	-	Bell 103	Bell 103	Bell 103	Bell 103	Bell 103	Bell 103	Bell 103

1 The originating K56flex modem will connect in K56flex modulation only if the answering modem is a K56flex client. Otherwise, the originating K56flex modem will connect in V.34 modulation if the answering modem is another K56flex server. 2 If V.FC modulation is supported in client modems. If not, expected modulation is V.32 bis.

Table 20

Mode Setting on Originating Modem	Mode Setting on Answering Access Server 56K Modem
	Bell 103	Bell 212A	V.22[b]	V.22[a]	V.22 bis	V.32	V.32 bis	V.FC	V.34	K56flex/ V.90
K56flex (32000-56000) V.90 (28000-56000)	-	-	-	V.22[a]	V.22 bis	V.32	V.32 bis	V.FC	V.34	K56flex
V.34 annex 12 (31200-33600)	-	-	-	V.22[a]	V.22 bis	V.32	V.32 bis	V.FC	V.34	V.34
V. 34 (2400-28800)	-	-	-	V.22[a]	V.22 bis	V.32	V.32 bis	V.FC	V.34	V.34
V.FC (14400-28800)	-	V.22[a]	-	V.22[a]	V.22 bis	V.32	V.32 bis	V.FC	V.FC	V.FC
V.32 bis (4800-14400)	-	V.22[a]	-	V.22[a]	V.22 bis	V.32	V.32 bis	V.32 bis	V.32 bis	V.32 bis
V.32 (4800-9600)	-	V.22[a]	-	V.22[a]	V.22 bis	V.32	V.32	V.32	V.32	V.32
V.22 bis (2400)	-	V.22[a]	-	V.22[a]	V.22 bis	V.22 bis	V.22 bis	V.22 bis	V.22 bis	V.22 bis
V.22[a] (1200)	-	V.22[a]	-	V.22[a]	V.22[a]	V.22[a]	V.22[a]	V.22[a]	V.22[a]	V.22[a]
V.22[b] (600)	-	-	V.22[b]	-	-	-	-	-	-	-
V.23[a] (xmt 75)	-	-	-	V.23[b]	V.23[b]	V.23[b]	V.23[b]	V.23[b]	V.23[b]	V.23[b]
V.23[b] (xmt 1200)	-	-	-	-	-	-	-	-	-	-
V.21(75-300)	-	V.22[a]	-	V.21	V.21	V.21	V.21	V.21	V.21	V.21
Bell 212A (1200)	Bell 212A	Bell 212A	-	V.22[a]	V.22[a]	V.22[a]	V.22[a]	V.22[a]	V.22[a]	V.22[a]
Bell 103 (300)	Bell 103	Bell 103	-	Bell 103	Bell 103	Bell 103	Bell 103	Bell 103	Bell 103	Bell 103

56K Modem Answers Call

Table 21

Mode Setting on Originating Access Server V.34 Modem	Mode Setting on Answering Modem
	Bell 103	Bell 212A	V.22[b]	V.22[a]	V.22 bis	V.32	V.32 bis	V.FC	V.34	K56flex/ V.90
V.34 annex 12 (31200-33600)					V.22 bis	V.32	V.32 bis	V.FC	V.34	V.34
V. 34 (2400-28800)				V.22[a]	V.22 bis	V.32	V.32 bis	V.FC	V.34	V.34
V.FC (14400-28800)	-	V.22[a]	-	V.22[a]	V.22 bis	V.32	V.32 bis	V.FC	V.FC	V.FC1
V.32 bis (4800-14400)	-	V.22[a]	-	V.22[a]	V.22 bis	V.32	V.32 bis	V.32 bis	V.32 bis	V.32 bis
V.32 (4800-9600)	-	V.22[a]	-	V.22[a]	V.22 bis	V.32	V.32	V.32	V.32	V.32
V.22 bis (2400)	-	V.22[a]	-	V.22[a]	V.22 bis	V.22 bis	V.22 bis	V.22 bis	V.22 bis	V.22 bis
V.22[a] (1200)	-	V.22[a]	-	V.22[a]	V.22[a]	V.22[a]	V.22[a]	V.22[a]	V.22[a]	V.22[a]
V.22[b] (600)	-	-	V.22[b]	-	-	-	-	-	-	-
V.23[a] (xmt 75)	-	-	-	V.23[b]	V.23[b]	V.23[b]	V.23[b]	V.23[b]	V.23[b]	V.23[b]
V.23[b] (xmt 1200)	-	-	-	-	-	-	-	-	-	-
V.21(75-300)	-	V.22[a]	-	V.21	V.21	V.21	V.21	V.21	V.21	V.21
Bell 212A (1200)	Bell 212A	Bell 212A	-	V.22[a]	V.22[a]	V.22[a]	V.22[a]	V.22[a]	V.22[a]	V.22[a]
Bell 103 (300)	Bell 103	Bell 103	-	Bell 103	Bell 103	Bell 103	Bell 103	Bell 103	Bell 103	Bell 103

1 If V.FC modulation is supported in client modems. If not, expected modulation is V.32 bis.

V.34 Modem Originates Call

Table 22 V.34 Modem Answers Call

Mode Setting on Originating Modem	Mode Setting on Access Server V.34 Answering Modem
	Bell 103	Bell 212A	V.22[b]	V.22[a]	V.22 bis	V.32	V.32 bis	V.FC	V.34
K56flex (32000-56000) V.90 (28000-56000)					V.22 bis	V.32	V.32 bis	V.FC	V.34
V.34 annex 12 (31200-33600)					V.22 bis	V.32	V.32 bis	V.FC	V.34
V. 34 (2400-28800)				V.22[a]	V.22 bis	V.32	V.32 bis	V.FC	V.34
V.FC (14400-28800)	-	V.22[a]	-	V.22[a]	V.22 bis	V.32	V.32 bis	V.FC	V.FC
V.32 bis (4800-14400)	-	V.22[a]	-	V.22[a]	V.22 bis	V.32	V.32 bis	V.32 bis	V.32 bis
V.32 (4800-9600)	-	V.22[a]	-	V.22[a]	V.22 bis	V.32	V.32	V.32	V.32
V.22 bis (2400)	-	V.22[a]	-	V.22[a]	V.22 bis	V.22 bis	V.22 bis	V.22 bis	V.22 bis
V.22[a] (1200)	-	V.22[a]	-	V.22[a]	V.22[a]	V.22[a]	V.22[a]	V.22[a]	V.22[a]
V.22[b] (600)	-	-	V.22[b]	-	-	-	-	-	-
V.23[a] (xmt 75)	-	-	-	V.23[b]	V.23[b]	V.23[b]	V.23[b]	V.23[b]	V.23[b]
V.23[b] (xmt 1200)	-	-	-	-	-	-	-	-	-
V.21(75-300)	-	V.22[a]	-	V.21	V.21	V.21	V.21	V.21	V.21
Bell 212A (1200)	Bell 212A	Bell 212A	-	V.22[a]	V.22[a]	V.22[a]	V.22[a]	V.22[a]	V.22[a]
Bell 103 (300)	Bell 103	Bell 103	-	Bell 103	Bell 103	Bell 103	Bell 103	Bell 103	Bell 103

Restricted Speed Matching

Use the %L0 or %L2 command options on both originating and answering modems to restrict the connection speed. Table 23 lists connection speeds using the %L0 partial speed matching option. Table 23 lists connections speeds using the %L2 speed matching disabled option. If %L2 is set, the modem speed matches the closest possible connection speed.

Table 23 %L0 Connection Speeds

Modem Speed	Possible Connection Speed
300	300
600	600
200	1200
2400	1200, 2400
4800	4800
7200	4800, 7200
9600	4800, 7200, 9600
12000	4800, 7200, 9600, 12000
14400	4800, 7200, 9600, 12000, 14400
16800	14400, 16800
19200	14400, 16800, 19200
21600	14400, 16800, 19200, 21600
24000	14400, 16800, 19200, 21600, 24000
26400	14400, 16800, 19200, 21600, 24000, 26400
28800	14400, 16800, 19200, 21600, 24000, 26400, 28800
31200	14400, 16800, 19200, 21600, 24000, 26400, 28800, 31200
33600	14400, 16800, 19200, 21600, 24000, 26400, 28800, 31200, 33600

Table 24 %L2 Connection Speeds

Modem Speed	Possible Connection Speed
300	300
600	600
1200	1200
2400	2400
4800	4800
7200	7200
9600	9600
12000	12000
14400	14400
16800	16800
19200	19200
21600	21600
24000	24000
26400	26400
28800	28800
31200	31200
33600	33600

%M (Modulation)

This command is used to set the upper modulation used in connections. Setting %M results in %B getting set to the maximum baud rate for that modulation.

Example: With AT%G0, setting %M will have no effect on %B.

With AT%G1, setting %M will cause the %B to be set tot he maximum value in that 
modulation.

%Mn (Modulation Selection)

This command is used to set the upper modulation used in connections. Table 25 lists command options.

Default

%M2 for V.34 modules
%M3 for 56 kbps modules (version 3.x.xx)
%M4 for V.90 56 kbps modules (version 5.x.xx)

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Note For specific AT command information pertaining to the V.90 interaction of %M and %B, see "V.90 56K AT Command Set Support".

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Table 25 Modulation Selection Command Options

Command	Meaning
%M0	Disables, V.34, and K56flex modulations V.32 bis, 14.4 kbps maximum
%M11	Disables V.34 and K56flex modulations V.FC, 28.8 kbps maximum
%M2	Disables K56flex modulation V.34, 33.6 kbps maximum
%M3	Enables all modulation modes, including K56flex K56flex, 56 kbps maximum
%M4	Enables all modulation modes, including V.90 V.90, 56 kbps maximum

1 %M1 is not supported for 56K modems.

%Rn (Read All Registers)

Displays the contents of modem S and :T registers as a table of values in decimal and hexadecimal format. Table 26 lists command options.

Table 26 Read All Registers Command Options

Command	Meaning
%R0	Displays the contents of all S registers as decimal and hexadecimal integers in tabular format
%R1	Displays the contents of all :T registers as decimal and hexadecimal integers in tabular format

The following display provides an example of the %R command:

at%r0

REG  DEC  HEX    REG  DEC  HEX

S00  001  01H    S14  138  8AH

S01  000  00H    S15  000  00H

S02  043  2BH    S16  000  00H

S03  013  0DH    S17  000  00H

S04  010  0AH    S18  000  00H

S05  008  08H    S19  000  00H

S06  002  02H    S20  000  00H

S07  060  3CH    S21  048  30H

S08  002  02H    S22  118  76H

S09  006  06H    S23  030  1EH

S10  060  3CH    S24  000  00H

S11  075  4BH    S25  005  05H

S12  050  32H    S26  001  01H

S13  000  00H    S27  064  40H

S13  000  00H    S27  064  40H

OK

%Un (Clear Serial Port Speed)

Sets the serial port speed. Table 27 lists command options.

Default

%U1

Table 27 Clear Serial Port Speed Options

Command	Meaning
%U0	Allows the current serial port speed to be changed to any other speed. This option is not required for speeds of 19200 bps and lower.
%U1	Always keeps the current serial port speed. You must enter %U1 each time you change the serial port speed.
%U2	Allows the current serial port speed to be changed from any speed.

%V (Display Modem Firmware Version)

Displays the modem firmware version and country code. Table 28 lists command options. (For country code listings, see Table 38.)

Default

%V1

Table 28 %V Display Modem Firmware Version

Command	Meaning
%V1	Provides detail to the X.X.X level, for example (note country code of 85, which is USA: at%v1 MNP Class 10 K56flex Modem Rev 3.1.30/85
%V0	Provides detail to the X.X level, for example (note country code of 85, which is USA: at%v1 MNP Class 10 K56flex Modem Rev 3.1/85

Ampersand Command Set

This section describes modem commands that begin with an ampersand (&) character.

&Cn (Serial Port DCD Control)

Controls the Data Carrier Detect (DCD) signal level. Use this command if your workstation requires DCD to be off at certain times. Table 29 lists command options. See also the \Dn command.

Default

&C1

Table 29 Serial Port DCD Control Command Options

Command	Meaning
&C0	DCD is always on.
&C1	DCD follows the state of carrier from the remote system and turns on after the connect message.
&C2	DCD is on except momentarily at disconnect.

&Dn (DTR Control)

Specifies the modem action when Data Terminal Ready (DTR) transitions off. The on-to-off transition of DTR must last as long as the value specified in register S25. Positive transitions of DTR (off-to-on) within five seconds after disconnect are ignored. Table 30 lists command options.

Default

&D3

Table 30 DTR Control Command Options

Command	Meaning
&D0	Ignores DTR. DTR is not needed for autoanswer.
&D1	Enters command state on detecting on-to-off transition of DTR. DTR is not needed for autoanswer.
&D2	Sets the modem on-hook when detecting an on-to-off transition of DTR and prepares the serial port to accept an AT command at any speed. DTR is needed for autoanswer.
&D3	Sets the modem on-hook and resets when detecting an on-to-off transition of DTR and prepares the serial port to accept an AT command at any speed. DTR is needed for autoanswer.

&F (Restore Command Defaults)

Restores the factory default configuration. Stored telephone numbers are not cleared.

&Gn (Guard Tone)

Sets the guard tone frequency on the answering mode. Table 31 lists command options.

Default

&G0

Table 31 Guard Tone Command Options

Command	Meaning
&G0	Disables the guard tone
&G1	Sets the guard tone on the answering modem to 550 Hz
&G2	Sets the guard tone on the answering modem to 1800 Hz

&Pn (Dial Pulse Ratio)

Sets the ratio of off-hook (make) to on-hook (break) time that the modem uses for pulse dialing. Table 32 lists command options.

Default

&P0

Table 32 Dial Pulse Ratio Command Options

Command	Meaning
&P0	Make 39 percent, break 61 percent
&P1	Make 33 percent, break 67 percent

&Sn (DSR Options)

Sets the serial port Data Set Ready (DSR) signal. Table 33 lists command options.

Default

&S0

Table 33 DSR Command Options

Command	Meaning
&S0	DSR is always on. Equivalent to setting the Serial Port DSR/CTS command \D.
&S1	DSR is on with answer tone. Equivalent to setting the Serial Port DSR/CTS command \D3.

&Tn (Diagnostic Test Mode)

Configures the modem to run a local or remote diagnostic test. Use the &T0 command to stop a running diagnostic test.Table 33 lists command options.

Default

&T5

Table 34 & Tn Diagnostic Test Mode

Command	Meaning
&T0	Ends a test in progress. The test ends without terminating a connection, returning the local and remote modems to normal operation. If a self-test is in progress, &T0 reports any errors. This command must be the last command on a command line.
&T1	Runs a local analog loopback test. The modem should display characters on your screen exactly as you enter them. The modem must be in normal or direct mode and set to 1200 bps or higher.
&T3	Local digital loopback test. Allows a remote modem that does not support the CCITT V.54 standard to perform a remote digital loopback test with the modem. The modem must be in normal or direct mode and set to 1200 bps or higher.
&T4	Allows the modem to respond to a remote caller's request to enter remote digital loopback mode. The modem must be in normal or direct mode and set to 1200 bps or higher.
&T5	Prevents the modem from responding to a remote digital loopback request.
&T6	Instructs the remote modem to initiate a remote digital loopback test. The modem must be in normal or direct mode and set to 1200 bps or above.
&T7	Instructs the remote modem to enter a remote digital loopback with a self-test. After the test is complete, the remote modem reports errors to the local device. The modem must be in normal or direct mode and set to 1200 bps or above.
&T8	Runs a local analog loopback with a self-test. The modem sends itself the ITU-T V.54 test pattern, verifies characters to make sure they are received correctly, and reports errors to the local device. The modem must be in normal or direct mode and set to 1200 bps or above.

&W (Store Current Configuration)

Stores the current configuration. The &W command stores the active commands and S registers, except restricted S registers S2 to S12, and the serial port speed and parity and modem port speed in effect when you enter the command. Telephone numbers are stored independently with the \Pn and &Zn commands.

---

Note The &W command does not save registers S2 to S12; the AT*W command saves all registers.

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Note The &W and *W commands share the same stored configuration area. Either of these commands overrides the other's stored settings. *W also stores settings for restricted S registers S2 to S12. If &W is used after *W, the default settings for the restricted S registers are restored. The stored settings are not saved during power up.

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Parenthesis Command Set

This section describes modem commands that begin with a right-parenthesis ()) character.

)Mn (Power Level Adjustment for Cellular Telephone Connections)

Adjusts power levels during link negotiation for reliable connections to accommodate signaling requirements of cellular telephone equipment. Table 34 lists command options.

Default

)M0

Table 35 Power Level Command Options

Command	Meaning
)M0	Adjusts the power level for central site modems if the remote modem is set to) M1. Use this option for MNP Class 10 modems that connect to both cellular and noncellular site modems.
)M1	Autoadjusts the power level for cellular modems.

Asterisk Command Set

This section describes modem commands that begin with an asterisk (*) character.

*I (Modem Identifier)

When the *I command is entered, the following prompt appears:

ID:

The identifier can consist of up to 25 ASCII characters. It is truncated after the 25th character. The modem identifier is also displayed by the \S command (Read Online Status).

Default

No default identifier.

*W (Store Complete Configuration)

Stores the complete modem configuration. The *W command stores the active commands and S registers, including the current values of restricted S registers S2 to S12 (which are not stored with &W), and the serial port speed and parity and modem port speed in effect when you enter the command. Telephone numbers are stored independently with the \Pn and &Zn commands.

---

Note The AT*W command saves all registers; the &W command does not save registers S2 to S12.

---

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Note The &W and *W commands share the same stored configuration area. Use one of the commands to override the other stored settings. The &W command stores the default settings for the restricted S registers S2 to S12. If &W is used after a *W command, the default settings for the restricted S registers are stored. The stored settings are not saved during power up.

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Hyphen Command Set

This section describes modem commands that begin with a hyphen (-) character.

-D{dial string} (Repeat Dial)

Redials a telephone number, up to nine times, until a connection is made. In reliable mode, the modem does not redial the number if the remote modem answers but fails to establish a reliable connection. Table 36 lists command options.

The dial string contains up to 98 characters. Valid dial string characters are 0-9, the dial modifiers listed in Table 3, and the # and * characters for tone dial. The modem ignores invalid characters.

Table 36 -D {dial string} Repeat Dial

Command	Meaning
-D/n	n is an integer between 1 and 9 that specifies a telephone number stored with the \P command.
-DL	Redials the last number dialed.
-DS	Dials the first entry stored in the directory.

-En (Modem Port Data Length)

Specifies the number of data bits used on the modem port during normal mode connections when the \N0 command (Operating Mode) is set, and the serial port is configured for asynchronous transmission of 11-bit characters. Both modems must be set to the same number of data bits. Table 37 lists command options.

The modems cannot pass data when a \N3 or \N5 reliable connection is set and falls back to a normal connection with 11-bit data characters enabled on both modems.

Default

-E0

Table 37 Modem Port Data Length Command Options

Command	Meaning
-E0	Enables 10-bit data during normal mode connections
-E1	Enables 11-bit data during normal mode connections

-Hn (Dumb Mode)

Configures the modem to smart mode (recognize commands on the Data Terminal Equipment [DTE] port and send result codes) or dumb mode (ignore commands on the DTE port and do not send result codes). Table 38 lists command options.

Default

-H0

Table 38 Dumb Mode Command Options

Command	Meaning
-H0	Smart mode
-H1	Dumb mode

-In (Country Code)

Sets the country code for the modem. The code does not take effect until the modem has been reset by the Z (Reset) command or a power cycle. Table 38 lists country codes.

Country codes that are set manually (that is, not following the procedure described in the next section, will remain in effect until one of the following events occur:

•Another -I command is sent.

•The firmware is reloaded. (Firmware reloads will always reset the country code to USA.)

•The access server is power cycled.

•The access server is reloaded.

---

Note You can also set country codes using Cisco IOS commands for Releases 11.2(10)P and later as well as 11.3(2)T and later. For more information, see the description of the modem country command in New and Changed Cisco IOS Commands for the Cisco AS5300, which is available at www.cisco.com.

---

Changing Country Codes on Microcom Modems

This section describes how to change the country code on Microcom modems in Cisco universal access servers. The default country code is USA. The USA country code is also used for the following countries: Argentina, Brazil, Canada, Chile, China, Columbia, Hong Kong, India, Indonesia, Korea, Malaysia, Mexico, Peru, Philippines, Singapore, Taiwan, and Thailand. If you are using the modems in a different country, you must change the country code.

Configure

Follow these steps:

---

Step 1 Enter global configuration mode:

Router> enable

Router# config term

Enter configuration commands, one per line.  End with CNTL/Z.

Router(config)#

Step 2 Edit the new modemcap and specify the country code (-InZ) in the miscellaneous attributes field. Substitute n with one of the country codes listed in the Country Code column of Table 38. In the following example, the country code is set to "18" for the Czech/Slovak Republic:

Router(config)# modemcap edit micro_czech miscellaneous -I18Z

Table 39 Country Codes

Country	Country Code	Country Code Displayed in Banner
Australia	20	49
Austria	22	92
Belgium1	23	67
Czech/Slovak Republic1	18	91
Denmark	10	63
Finland	9	71
France1	25	32
Germany	17	68
Israel	15	16
Italy	3	21
Ireland	24	97
Japan	13	14
Netherlands	5	04
New Zealand	11	55
Norway	8	72
Poland	19	93
Portugal	27	94
Spain	6	76
South Africa	16	69
Sweden	7	09
Switzerland1	14	66
UK2	2	12
USA3	1	85

1 The s-register is set to s0=2 (that is, answer on the second ring) by default. Additional configuration is required. 2 The UK country code is also used for Greece, Hungary, and Saudi Arabia. 3 The USA country code also applies to Argentina, Brazil, Canada, Chile, China, Columbia, Hong Kong, India, Indonesia, Korea, Malaysia, Mexico, Peru, Philippines, Singapore, Taiwan, and Thailand.

Step 3 If you are using the country code for Belgium, the Czech/Slovak Republic, France, or Switzerland, additional configuration is required. These country codes are set by default to answer on the second ring (that is, the s-register is set to s0=2). This default setting conflicts with the Cisco IOS software default fast-answer feature, which answers after only one ring.

•Edit the modemcap to answer calls on the second ring:

Router(config)# no modem fast-answer

Router(config)# modemcap edit micro_czech autoanswer s0=2

•Modem firmware Releases 1.0.37 through 2.2.8 (that is, V.34 modems only) also require the :T26=8 command. Note that you must reenter the country code too. Whenever you modify an attribute field, you must enter all values. New values are not appended to any existing values you may have already entered:

Router(config)# modemcap edit micro_czech miscellaneous :T26=8-I18Z

Router(config)# exit

Router#

---

Note Modem firmware Release 1.0.23 does not require the :T26=8 setting because it does not support digital fast-connect.

---

Step 4 Enter global configuration mode and specify the lines on which to apply the new modemcap. Lines 1 through 48 are specified in the following example:

Router# config term

Router(config)# line 1 48

Router(config-line)# modem autoconfigure type micro_czech 

Some messages display while the modems are reconfigured using the new modemcap. When the last message appears, press Return:

.

.

.

3w5d: TTY48: Done with modem configuration

Step 5 Save the configuration changes to NVRAM:

Router(config-line)# Ctrl-Z

Router# copy running-config startup-config

[OK]

Verify

Verify the configuration changes using one of the following methods.

The following example shows verification from the router command prompt:

Router# show modemcap mcom_czech

Modemcap values for mcom_czech

Factory Defaults (FD):  [not set]

Autoanswer (AA):  [not set]

Carrier detect (CD):  [not set]

Drop with DTR (DTR):  [not set]

Hardware Flowcontrol (HFL):  [not set]

Lock DTE speed (SPD):  [not set]

DTE locking speed (DTE):  [not set]

Best Error Control (BER):  [not set]

Best Compression (BCP):  [not set]

No Error Control (NER):  [not set]

No Compression (NCP):  [not set]

No Echo (NEC):  [not set]

No Result Codes (NRS):  [not set]

Software Flowcontrol (SFL):  [not set]

Caller ID (CID):  [not set]

On-hook (ONH):  [not set]

Off-hook (OFH):  [not set]

Miscellaneous (MSC):  -i18z		

Template entry (TPL):  [not set]

Router#

---

Note The Miscellaneous (MSC) field is the only nondefault field set in the modemcap.

---

The following example shows verification using debug:

---

Step 1 Enable modem debug:

Router# debug confmodem

Modem Configuration Database debugging is on

Router# debug modem

Modem control/process activation debugging is on

Router#

Step 2 Clear an idle line:

Router# clear line 1

[Confirm]

OK

DTR drops and modem autoconfigure runs when the modem is reset. It may take a minute while the messages display:

Router#

*Mar  3 23:20:26.114: TTY1: Line reset

*Mar  3 23:20:26.118: TTY1: Modem: IDLE->HANGUP

*Mar  3 23:20:26.534: TTY1: dropping DTR, hanging up

*Mar  3 23:20:26.534: tty1: Modem: HANGUP->IDLE

*Mar  3 23:20:31.838: TTY1: restoring DTR

*Mar  3 23:20:32.958: TTY1: Modem command:  --AT&F&C1&D2:T26=8-I18Z 
\ Q3\N5-K0\J0%C3$B115200S0=2H0--

*Mar  3 23:20:34.234: TTY1: Modem configuration succeeded

*Mar  3 23:20:36.090: TTY1: locking speed (115200) response ---OK---

*Mar  3 23:20:36.090: TTY1: locked DTE speed at 115200

*Mar  3 23:20:36.094: TTY1: Done with modem configuration

Step 3 Verify that the country code has changed:

Router#modem at-mode 0/0

You are now entering AT command mode on modem (slot 0 / port 0).

Please type CTRL-C to exit AT command mode.

at%v1 

MNP Class 10 V.34/V.FC Modem Rev 3.1.30/91

OK

The example shows Rev 2.1.9/91. Locate "91" in the "Country Code Displayed in Banner" column of Table 2. Notice that "91" is for the Czech/Slovak Republic.

Step 4 Press Ctrl-C to exit the direct-connect session.

This concludes the procedure for changing the country code.

-Jn (Detect Phase)

Configures the originating modem to send a control sequence to the answering modem to determine the type of error correction enabled, either LAPM, MNP, or none. See the \Nn command (Operating Mode) for information about the types of connections that can be established. Table 40 lists command options.

Default

-J1

Table 40 Detect Phase Command Options

Command	Meaning
-J0	Disables detect phase
-J1	Enables detect phase

-Kn (MNP Extended Services)

Configures the modem to use MNP extended services that are not available when operating in LAPM mode. For example, two modems with MNP extended services enabled negotiate MNP Class 10 with V.42 bis compression instead of LAPM. Table 41 lists command options.

Default

-K1

Table 41 -Kn MNP Extended Services

Command	Meaning
-K0	Disables MNP extended services
-K1	Enables MNP extended services
-K2	Enables MNP extended services without MNP indication during the answer detect phase

-Mn (MNP Class Connect Messages)

Determines whether MNP class connect messages are displayed. Table 42 lists command options.

The -M1 setting overrides the \V command (Error Correction Result Code Form) for long-form connection result codes and the Wn command (Connection Speed Reporting) for serial-port connect messages. The following commands override the -Mn command:

•V0 (short form result codes enabled)

•X0 (extended result codes disabled) displays only CONNECT

Default

-M0

Table 42 MNP Class Connect Messages

Command	Meaning
-M0	Disables MNP class connect messages
-M1	Enables the following formats for MNP class connect messages, where n equals MNP class (from 1 to 10), and x means the type of data compression (V.42 bis or MNP Class 5): •CONNECT for normal and direct connections •CONNECT MNPn/x for MNP connections •CONNECT MNPn for modems that do not negotiate compression •CONNECT MNPn/CELLULAR/x if) M1 (Power Level Adjustment) is set •CONNECT LAPM for LAPM connections with no compression active •CONNECT LAPM/V42 bis for LAPM V.42 bis connections

-On (Serial Port Parity)

Changes the serial port parity set by the AT sequence. Use this command when the local device supports XON/XOFF flow control and detects parity to ensure that all modem-generated XON and XOFF characters have the correct parity. Table 43 lists command options.

You can also use the -On command to change the serial port parity while connected to a remote device. Modem port parity cannot be changed after a connection is established. When the parity required for a connection is not the parity set by the sequence, you must set the correct parity when you enter the Dial command, as part of the same command line.

The AT sequence cannot be used to match space parity; no parity is set instead. You must enter -O3 to set space parity.

Default

-O4

Table 43 Serial Port Parity Command Options

Command	Meaning
-O0	7 data bits, odd parity
-O1	7 data bits, even parity
-O2	7 data bits, mark parity
-O3	7 data bits, space parity
-O4	8 data bits, no parity
-O5	8 data bits, odd parity
-O6	8 data bits, even parity
-O7	8 data bits, mark parity

-Pn (Check Parity)

Controls parity checking of XON and XOFF characters, the escape code sequence, and HP ACK characters. In command state, all command echoes and command responses from the modem are sent to the workstation with parity that matches the serial port parity. Table 44 lists command options.

Default

-P0

Table 44 Check Parity Command Options

Command	Meaning
-P0	Ignores parity for special characters. All received data is passed to the workstation with parity corrected to match the serial port parity.
-P1	Processes special characters received from the workstation only if their parity matches the serial port parity. All received data is passed to the workstation at 8 data bits with no parity.
-P2	Processes special characters only if their parity matches the serial port parity. Modem port flow control characters are recognized, regardless of whether their parity matches the serial port parity. All received data is passed to the workstation with parity corrected to match the serial port parity.

-Qn (Fallback Modulation Speed)

Configures the modem to fall back from a V.32 bis or V.32 MNP reliable connection at 14400, 9600, 7200, or 4800 bps to a V.22 bis MNP reliable connection at 2400 bps or a V.22 MNP reliable connection at 1200 bps. Fallback can occur when poor telephone lines cause excessive MNP retransmissions. Table 45 lists command options.

Fallback from a V.32 bis or V.32 MNP reliable connection to V.32 bis or V.32 at 4800 bps is always enabled for any -Qn command option. The modem always uses the V.22 standard when it falls back from a V.32 MNP reliable connection to a 1200 bps MNP reliable connection for any Bn setting (ITI-U/Bell mode).

Default

-Q2

Table 45 Modulation Speed Command Options

Command	Meaning
-Q0	Disables fallback from a V.32 bis or V.32 MNP reliable connection to an MNP reliable 2400 or 1200 bps connection
-Q1	Enables fallback from a V.32 bis or V.32 MNP reliable connection to an MNP reliable 2400 bps connection
-Q2	Enables fallback from a V.32 bis or V.32 MNP reliable connection to an MNP reliable 2400 or 1200 bps connection

-V (Split Modem Port Speed with Multiprotocol Autoanswer)

Determines whether the modem port uses split transmit and receive speed operation when using the multiprotocol autoanswer feature. %F0 must also be set. Note that V.23 is the split speed on the modem link (that is, 75/1200 bps). Table 46 lists split serial port speed command options.

Default

-V1 for U.S.
-V0 for international

Table 46 Split Serial Port Speed with Multiprotocol Autoanswer Command Options

Command	Meaning
-V0	Enables V.23 split modem port speed connections within the multiprotocol autoanswer feature
-V1	Disables V.23 split modem port speed connections within the multiprotocol autoanswer feature

Colon Command Set

This section describes modem commands that begin with a colon (:) character.

:Dn (Manual Dial)

Sets the modem off-hook in originate mode when DTR is raised. Table 47 lists command options.

Default

:D0

Table 47 Manual Dial Command Options

Command	Meaning
:D0	The modem is not set off-hook when DTR is raised.
:D1	The modem is set off-hook in originate mode when DTR is raised. &Dn (DTR Control) also must be set. For example, if &D2 is set, the modem is set off-hook 5 seconds after recognizing the positive transition of DTR.
:D2	The modem is set off-hook in originate mode and dials the first stored telephone number when DTR is raised. &Dn must also be set.

:En (Compromise Equalizer)

Configures the modem to use the compromise equalizer when it connects in V.32 mode. Table 48 lists command options.

Default

:E1

Table 48 Compromise Equalizer Command Options

Command	Meaning
:E0	Disables the compromise equalizer only when the modem is in V.32 mode. Use :E0 only when you are performing back-to-back or PBX-to-PBX V.32 mode connections.
:E1	Enables the compromise equalizer. Use :E1 for outside line-to-outside line or PBX-to-outside line connections.

:Tn? (Read Configuration Register)

Displays the contents of :T register n (where n is a decimal number).

@Character Command Set

This section describes modem commands that begin with an at (@) character.

@Cn (CTR, DSR, and DCD Connect Message Control)

Sets DSR, Clear To Send (CTS), and DCD on before or after a connect message. Used with the :T14 (Connect Message Delay Timer) register. Table 49 lists command options.

Default

@C0

Table 49 Connect Message Control Command Options

Command	Meaning
@C0	Sets CTS, DSR, and DCD on before the connect message is sent
@C1	Sets CTS, DSR, and DCD on after the connect message is sent

@E (Detailed Modem Call Status)

This is an unofficially supported modem status and debugging command that can be used by an experienced user to verify the detailed status of the modem during or after a call. The content of this command may change as required to assist in problem resolution. Therefore, the command may produce results that differ from the description in this document. For more information, see the section "Debugging," on page 78.

@Mn (Select Transmit Level for Cellular Connections)

Selects the initial transmit level for the connection. You can set levels from -10 to -35 decibels referred to 1 milliwatt (dBm). From @M10 to @M35, the level is the as -n dBm. Table 50 lists selected transmit level command options.

Default

@M0

Table 50 Selected Transmit Level Command Options

Command	Meaning
@M0	-26 dBm
@M1	-30 dBm
@M2	-10 dBm
@M10	-10 dBm
@M35	-35 dBm

@Un (Minimum Connection Speed)

The AT@U command sets the minimum connection speed for both Rx and Tx speeds. Use the AT@U command to execute the following connections:

•Set AT@U to a K56Flex speed—Results in NC, the lowest downlink speed (32000), which is higher than the maximum uplink speed (31200)

•Set AT@U to a V.90 speed—Results in a connection if AT@U is set to 28000, 29333, or 30667. Higher V.90 speeds result in no available uplink speed.

Backslash Command Set

This section describes modem commands that begin with a backslash (\) character.

\An (Maximum MNP Block Size)

Sets the maximum block size for MNP stream link connections. Table 51 lists command options.

Default

\A3

Table 51 MNP Block Size Command Options

Command	Meaning
\A0	64 characters
\A1	128 characters
\A2	192 characters
\A3	256 characters

\Bn (Transmit Break)

Sends Break to the remote system for 100n milliseconds. In a reliable link, Break is always sent for 300 milliseconds. Use the O command (Enter Connect State) to return to connect state. See also the \K command (Break Control).

Range

1 to 9 (100-millisecond increments)

Default

\B3 (300 milliseconds)

\Cn (Autoreliable Buffer)

Configures the modem to buffer data in autoreliable, autoanswer mode. The answering modem's data buffer can be used to store data during the 3-second link negotiation for a reliable connection. Table 52 lists command options.

For example, you can use %A to set the autoreliable fallback character to ASCII 13 (carriage return). Then set \C2 and \N3 (autoreliable mode). Non-MNP callers who connect and press Return to log on do not need to wait for the 3-second autoreliable window to expire before data can pass. See the \Nn command (Operating Mode) for more information about autoreliable and normal modes.

The \Jn command (Bps Rate Adjust) affects the type of connection established. Reliable and direct connections can result when bps rate adjust is enabled (\J1). Reliable and normal connections may result when bps rate adjust is disabled (\J0).

Default

\C0

---

Note When either \C1 or \C2 is set, reliable and normal connections can result regardless of bps rate adjustments.

---

Table 52 Autoreliable Buffer Command Options

Command	Meaning
\C0	Data is not buffered during link negotiation. The modem changes to normal or direct mode if a SYN character is not detected within 3 seconds.
\C1	Buffers all data on the answering modem until 200 non-SYN characters are received or a SYN character is detected within 3 seconds. If 200 non-SYN characters are received, the modem changes to normal mode and passes the data to the serial port. If the modem detects a SYN character within 3 seconds, it attempts to establish a reliable connection. Otherwise, the modem changes to normal mode.
\C2	Data is not buffered on the answering modem. The modem changes to normal mode when it receives an autoreliable fallback character defined by the %A command and passes that character to the serial port. Use the%C2 command when the modem receives calls from both modems that support MNP and modems that do not support MNP, so that the modem can change to normal mode as soon as it detects a logon character (defined by %A) from a non-MNP caller, eliminating the 3-second wait.

\Dn (Serial Port DSR/CTS Control)

Controls the DSR and CTS signals on the serial port. Use this command when the central site computer requires DSR and CTS to be off at certain times. Table 53 lists command options.

Selecting hardware flow control for the serial port overrides the \Dn command. When hardware flow control is selected, the CTS line indicates the ability of the modem to receive data from your workstation, and the DSR action does not change.

Default

\D0

Table 53 Serial Port DSR/CTS Control Command Options

Command	Meaning
\D0	DSR and CTS are always on.
\D1	DSR and CTS follow DCD. If the &C1 command (Serial Port DCD Control) is also set, DSR follows off-hook.
\D2	DSR and CTS both follow DCD.
\D3	DSR follows the answer tone, CTS is always on.

Serial Port Signal Options

Use the &Cn and \Dn commands to control the serial port DCD, DSR, and CTS signal levels when your workstation requires DCD, DSR, and CTS to be off at certain times. Table 54 lists command options and signal level results.

Table 54 Serial Port Signal Options

&Cn Option	\Dn Option	Result
0	0	DCD on, DSR on, CTS on
0	1	DCD on, DSR on, CTS on
0	2	DCD on, DSR on, CTS on
0	3	DCD on, DSR with answer tone, CTS on
0	4	DCD on, CTS and DTR comply with ITU-T recommendations
1	0	DCD follows modem carrier, DSR on, CTS on
1	1	DCD follows modem carrier, DSR follows off-hook, CTS follows CD
1	2	DCD follows modem carrier, DSR and CTS both follow CD setting
1	3	DCD follows modem carrier, DSR with the answer tone, CTS on
1	4	DCD follows modem carrier, CTS and DTR comply with ITU-T recommendations
2	0	DCD on (off for a few seconds at disconnect only), DSR on, CTS on
2	1	DCD, DSR, and CTS on (off for a few seconds at disconnect)
2	2	DCD, DSR, and CTS on (off for a few seconds at disconnect)
2	3	DCD off at disconnect then on, DSR with the answer tone, CTS on
2	4	DCD on (off for a few seconds at disconnect only), CTS and DTR comply with ITU-T recommendations

\En (Data Echo)

Configures the modem to echo characters sent from the local workstation in connect state. Table 55 lists command options.

Default

\E0

Table 55 Data Echo Command Options

Command	Meaning
\E0	Does not echo data sent by the local workstation.
\E1	Echoes data sent by the local workstation. \E1 functions only with normal mode connections.

\F (Display Stored Phone Numbers)

Displays the telephone numbers currently stored in the telephone directory.

\Gn (Modem Port Flow Control)

Sets the flow control method used to pace data between modems during a normal mode connection. Table 56 lists command options.

A reliable link has its own method of flow control and ignores the \Gn setting. The \ Qn command (Serial Port Flow Control) settings determine DTE port flow control during a reliable link.

Default

\G0

Table 56 Modem Port Flow Control Command Options

Command	Meaning
\G0	Disables modem port flow control.
\G1	Sets modem port flow control to XON/XOFF. The modem sends an XOFF character to stop received data and sends an XON character to resume reception of data.
\G2	Sets modem port flow control to unidirectional XON/XOFF. The modem sends XON and XOFF characters to the remote device but ignores XON and XOFF received from the remote device.

\Jn (Bps Rate Adjust)

Automatically adjusts the speed of the serial port to match the speed of the connection. Table 57 lists command options.

When a reliable connection is established at a speed between 4800 and 14400 bps and the bps rate adjust option is enabled, the serial port speed always adjusts to 9600 bps. If the connection is established at 14400 bps or higher, the serial port speed is adjusted to 19200 bps. If you set the serial port to the modem's highest rate of 115200 bps, turn off bps rate adjust so the serial port stays at 115200 bps.

Default

\J0

---

Note When \J1, \C0 (the autoreliable buffer), and \N3 (the autoreliable mode) are set, the modem uses direct mode instead of normal mode if a reliable connection is not established.

---

Table 57 bps Rate Adjust Command Options

Command	Meaning
\J0	Disables bps rate adjust. The serial port rate is independent of the rate of the connection. This option is recommended for the highest throughput when data compression is used.
\J1	Enables bps rate adjust. The modem automatically adjusts the speed of the serial port to match the speed of the connection until the connection terminates. If your workstation does not automatically change to the adjusted bps rate, you must manually change the bps rate to the new setting. See the %U command (Clear Serial Port Speed) for information about resetting the serial port bps rate.

\Kn (Break Control)

Determines the type of Break the modem transmits when it receives a Break. Table 58 describes the effect of n. The modem can buffer up to four Breaks on both the modem port and the serial port.

Default

\K5

---

Note In reliable link connect state, the sender's Break control setting determines how the receiver handles the Break.

---

Table 58 \Kn Break Control 

Command	Local DTE Sends Break During Reliable or Normal Connection	Local DTE Sends \Bn, Local Modem in Command Mode, During Reliable or Normal Connection	Local Modem Sends Break During Direct Connection	Remote Modem Sends Break During Normal Connection
\K0	Enter command state; no Break to the remote system1	Empty data buffers; send a Break to the remote system	Send a Break to the remote system; set the modem to command state	Empty data buffers; send a Break to the serial port
\K1	Empty data buffers; send a Break to the remote system	Same as \K0	Send a Break to the remote system	Same as \K0
\K2	Same as \K0	Immediately send a Break to the remote system	Same as \K0	Immediately send a Break to the serial port
\K3	Immediately send a Break to the remote system	Same as \K2	Same as \K1	Same as \K2
\K4	Same as \K0	Send a Break to the remote system in sequence with any transmit data being buffered	Same as \K0	Send a Break to the serial port in sequence with the receive data being buffered
\K5	Send a Break to the remote system in sequence with transmit data	Same as \K4	Same as \K1	Same as \K4

1 Forces the modem to command state. To transmit a Break and enter connect state, enter the \B0 command. See the \B command description for details.)

\Nn (Operating Mode)

Selects the modem operating mode. Table 59 lists command options.

Default

\N3

---

Note You can set the operating mode for a single call using dial modifiers. See Table 3 for details.

---

Table 59 \Nn Operating Mode

Command	Meaning
\N0	Sets normal mode. \N0 can be used to communicate with most modems. No error correction is performed in normal mode.
\N1	Sets direct mode. \N1 ignores flow control and does not buffer data. In connect state, the serial port always adjusts to the speed of the connection for any \Jn setting. No error correction is performed in direct mode. The escape code sequence is disabled in direct mode if \J0 is set.
\N2	Sets MNP reliable mode to provide error detection and automatic data retransmission between systems that support the MNP reliable link. The modem disconnects if it fails to establish an MNP reliable link immediately after making a connection. Some protocols are not timed to work with MNP and can interfere with its effectiveness. Both modems should use flow control on the serial port in an MNP reliable link. When a transmission error is detected, data is buffered during the retransmission.
\N3	Sets autoreliable mode. The answering modem looks for incoming MNP or LAPM protocol characters from the remote modem. If it detects the characters within approximately 3 seconds, it tries to establish a reliable link connection. If both modems are set to autoreliable mode, a normal connection or no connection can result because of noise on the telephone line. When the modem is set to autoanswer in autoreliable mode, you can shorten the 3-second period by using the %A command with the \C2 command. \N3 lets the modem communicate with remote modems that may not support the MNP or LAPM reliable link.
\N4	Sets LAPM reliable mode to provide error detection and automatic data retransmission between systems that support the LAPM reliable link. The modem disconnects if it fails to establish a LAPM reliable link immediately after making a connection.
\N5	Sets LAPM reliable mode with fallback to normal mode.
\N6	Sets LAPM reliable mode with fallback to MNP reliable mode.

Table 60 lists connections that can be established, depending on the operating mode enabled on each modem. When more than one operating mode is listed within a column, the first mode is for the originating modem and the second is for the answering modem. NC indicates no connection.

---

Note For LAPM connections listed in Table 59, if the originate and answer modems have -K1 (MNP Extended Services) set for V.42 connections, the extended features of MNP are applied during the connection.

---

Table 60 Possible Connections for Operating Mode Command Options

Answering Modem	Originating Modem
	\N0	\N1	\N2	\N3	\N4	\N5	\N6
\N0	Normal	Direct/normal	NC	Normal	NC	Normal	NC
\N1	Normal/direct	Direct	NC	Normal/direct	NC	Normal/direct	NC
\N2	NC	NC	MNP	MNP	NC	NC	MNP
\N3	Normal	Direct/normal	MNP	MNP	LAPM	LAPM	LAPM
\N4	NC	NC	NC	LAPM	LAPM	LAPM	LAPM
\N5	Normal	Direct/normal	NC	LAPM1	LAPM	LAPM	LAPM
\N6	NC	NC	MNP	MNP	LAPM	LAPM	LAPM

1 For the modem to establish a LAPM connection, -K0 must be set.

\Pn{dial string} (Store a Telephone Number)

Stores entry n in the modem's telephone directory, where n is an integer (1 to 9) and dial string is a string of up to 98 characters. Valid dial string characters are 0 to 9, dial modifiers, and # and * for tone dialing. The modem ignores invalid characters. Dial strings longer than 98 characters return error messages. Phone numbers are not saved during a power reset.

\ Qn (Serial Port Flow Control)

Selects the flow control method used in the serial port. In direct mode connections, the modem ignores the \ Qn command. Table 61 lists command options.

Default

\ Q3

Table 61 \Qn Serial Port Flow Control

Command	Meaning
\ Q0	Disables flow control.
\ Q1	Enables bidirectional XON/XOFF flow control. Data transmission is stopped by an XOFF character and restarted by an XON character. The modem generates XON and XOFF characters at the same parity used on the serial port. The serial port responds to XON and XOFF characters sent by the local workstation in the same way.
\ Q2	Enables unidirectional CTS/RTS hardware flow control. The modem turns CTS off to signal the local workstation to stop transmitting data and turns CTS on to signal the local workstation to resume transmitting data.
\ Q3	Enables bidirectional CTS/RTS hardware flow control. The modem uses CTS to start and stop transmission from the local workstation. When RTS is off, the modem stops transmitting. When RTS is on the modem resumes transmission.
\ Q4	Enables unidirectional XON/XOFF flow control. The modem serial port generates, but does not respond to, XON/XOFF flow control characters. This setting allows for computers to transmit data that contains XON and XOFF data characters. The computer can still be set to respond to XON/XOFF flow control characters sent to it from the modem during serial port flow control.
\ Q5	Enables unidirectional hardware flow control and keeps CTS off until the connection is established.
\ Q6	Enables bidirectional hardware flow control and keeps CTS off until a connection is established. RTS is ignored when it is not connected.

\Rn (Serial Port Ring Indicator)

Controls the Ring Indicator (RI) signal. RI follows the incoming ring signal on the telephone line. Table 62 lists command options.

Default

\R1

Table 62 Serial Port Ring Indicator Command Options

Command	Meaning
\R0	Turns on the ring indicator signal after the ring and keeps it on for the duration of the telephone call.
\R1	Turns off the ring indicator signal after the telephone call is answered.

\Sn (Read Online Status)

Displays a list of modem commands and their current settings, the active connection type, the elapsed connect time, and the telephone number most recently dialed. The \S0 command outputs a single-screen display (press any key for the next screen). The \S1 command outputs a continuous screen display. Press Ctrl-X or Break to cancel the display.

---

Note Some commands listed in the output do not apply to your modems, for example SPKR CTRL and SPKR VOL are not supported in any universal access server 12-port modem module.

---

The following display is an example of \S1 command output with factory default settings for a V.34 modem:

at\s1

IDLE           000:02:01

LAST DIAL      t1714756,0947

NET ADDR:      FFFFFFFFFFFF

MODEM HW: OEM 2W United States

4 RTS 5 CTS 6 DSR - CD 20 DTR - RI 

MODULATION     IDLE

MODEM BPS      33600  AT%G0   

MODEM FLOW     OFF    AT\G0

MODEM MODE     AUT    AT\N3

V.23 OPR.      OFF    AT%F0

AUTO ANS.      ON     ATS0=1

SERIAL BPS     115200 AT%U1   

BPS ADJUST     OFF    AT\J0

SPT BPS ADJ.   0      AT\W0

ANSWER MESSGS  OFF    ATQ2   

SERIAL FLOW    BHW    AT\Q3

PASS XON/XOFF  OFF    AT\X0

PARITY         8N     AT

BREAK          5      AT\K5

EXIT CHAR      043    ATS2=43

ANS DUMB MODE  ON     AT#E1

CMD ECHO       ON     ATE1

RESULTS        OFF    ATQ2

RESULT TYPE    MNPX   ATV1\V2

CONNECT MSG    MDM    ATW2

CONN MNP-      0      AT-M0

SPEED MATCH    1      AT%L1

EQUALIZER      1      AT:E1

FALLBACK       2      AT-Q2

DATA ECHO      OFF    AT\E0

INACT TIMER    00     AT\T0

AUTO RETRAIN   ON     AT%E1

COMPRESSION    ALL    AT%C3

MAX BLK SIZE   256    AT\A3

AUTO BUFF      0      AT\C0

AUTO CHAR      000    AT%A0

EMULATING HP   OFF    AT\H0

PAUSE TIME     002    ATS8=2

DTR            3      AT&D3

MABP ADDRESS   001    AT^P1

CARR DET       1      AT&C1

DSR            0      AT\D0

RING IND       1      AT\R1

SPKR CTRL      1      ATM1

SPKR VOL       2      ATL2

LNG SPC DISC   OFF    ATY0

DISC DELAY     000    AT%D0

RDLB ENABLE    OFF    AT&T5

DIAL MODE      4      ATX4   

PULSE DIAL     60%    AT&P0

PULSE MODE     N      AT%W0

V23 HD EQU     ON     AT%O1

GUARD TONE     0      AT&G0

DATA CALL TONE OFF    AT-C0

2ND FC         OFF    AT-F0

NM BIT VALUE   0      AT-E0

PAR CHK        0      AT-P0

MANUAL DIAL    0      AT:D0

UPSHIFT BPS    OFF    AT*H0

CELLULAR       OFF    AT)M0

LINETYPE       000    AT@M0

DETECT PHASE   ON     AT-J1

MNP EXT SVC    1      AT-K1

UNIV V.23      1      AT-V1

CONNECT MSG    1ST    AT@C0

DUMB MODE      OFF    AT-H0

BELL           ON     ATB1

CALL ABT DISAB OFF    AT-Y0

REVERSE ANS    OFF    AT-W0

MIN CONN SPD   300    AT@U

OK

The following display is an example of \S1 command output with factory default settings for a 56K modem:

at\s1

IDLE           000:00:00

LAST DIAL

NET ADDR:      FFFFFFFFFFFF

MODEM HW: OEM 2W United States

4 RTS 5 CTS 6 DSR - CD 20 DTR - RI

MODULATION     IDLE

MODEM T/R BPS  *****  *****

MODEM BPS      56000  AT%G0

MODEM FLOW     OFF    AT\G0

MODEM MODE     AUT    AT\N3

BASE MODE      K56    AT%M3

V.23 OPR.      OFF    AT%F0

AUTO ANS.      ON     ATS0=1

SERIAL BPS     115200 AT%U1

BPS ADJUST     OFF    AT\J0

SPT BPS ADJ.   0      AT\W0

ANSWER MESSGS  ON     ATQ0

SERIAL FLOW    BHW    AT\Q3

PASS XON/XOFF  OFF    AT\X0

PARITY         8N     AT

BREAK          5      AT\K5

EXIT CHAR      043    ATS2=43

ANS DUMB MODE  ON     AT#E1

CMD ECHO       ON     ATE1

RESULTS        ON     ATQ0

RESULT TYPE    MNPX   ATV1\V2

CONNECT MSG    MDM    ATW2

CONN MNP-      0      AT-M0

SPEED MATCH    1      AT%L1

EQUALIZER      1      AT:E1

FALLBACK       2      AT-Q2

DATA ECHO      OFF    AT\E0

INACT TIMER    00     AT\T0

AUTO RETRAIN   ON     AT%E1

COMPRESSION    ALL    AT%C3

MAX BLK SIZE   256    AT\A3

AUTO BUFF      0      AT\C0

AUTO CHAR      000    AT%A0

EMULATING HP   OFF    AT\H0

PAUSE TIME     002    ATS8=2

DTR            2      AT&D2

MABP ADDRESS   003    AT^P3

CARR DET       1      AT&C1

DSR            0      AT\D0

RING IND       1      AT\R1

SPKR CTRL      1      ATM1

SPKR VOL       2      ATL2

LNG SPC DISC   OFF    ATY0

DISC DELAY     000    AT%D0

RDLB ENABLE    OFF    AT&T5

DIAL MODE      4      ATX4

PULSE DIAL     60%    AT&P0

PULSE MODE     N      AT%W0

V23 HD EQU     ON     AT%O1

GUARD TONE     0      AT&G0

DATA CALL TONE OFF    AT-C0

2ND FC         OFF    AT-F0

NM BIT VALUE   0      AT-E0

PAR CHK        0      AT-P0

MANUAL DIAL    0      AT:D0

UPSHIFT BPS    OFF    AT*H0

CELLULAR       OFF    AT)M0

LINETYPE       000    AT@M0

DETECT PHASE   ON     AT-J1

MNP EXT SVC    1      AT-K1

UNIV V.23      1      AT-V1

CONNECT MSG    1ST    AT@C0

DUMB MODE      OFF    AT-H0

BELL           ON     ATB1

CALL ABT DISAB OFF    AT-Y0

REVERSE ANS    OFF    AT-W0

MIN CONN SPD   300    AT@U

OK

---

Note On V.34 or 56K modems, the 00B MABP port address is a variable from 1-24.

---

\Tn (Inactivity Timer)

Specifies the time, in minutes, that the modem waits before hanging up when data is not sent or received. The inactivity timer is available only during normal and reliable link connections. \T0 disables the timer.

Range

0 to 90 minutes

Default

\T0 (disabled)

\Vn (Error Correction Result Code Form)

Sets the result code format to display a reliable link connection. The speed field content is determined by the Wn command (Connection Speed Reporting) setting. Setting -M1 (MNP Class Connect Messages) changes the format of the long form connection result codes. Table 63 lists command options.

Set V0\V3 if your software requires Hayes-compatible connection result codes. When V1 is set to select long form result codes, \V3 is equivalent to \V2.

Default

\V2

Table 63 \Vn Error Correction Result Code Form

Command	Meaning
\V0	Displays standard long form result codes, CONNECT speed. Use \V0 when your communications software does not expect a reliable link result code, even if a reliable connection is established.
\V1	Adds /REL to long form error correction result codes, CONNECT speed /REL. 9600/REL also indicates 4800-, 7200-, and 12000-bps reliable connections.
\V2	Displays long form error correction protocol result codes: •CONNECT speed /REL-MNP •CONNECT speed/REL-LAPM •CONNECT speed/REL-CELLULAR 9600/REL also indicates 4800-, 7200-, and 12000-bps reliable connections.
\V3	Adds /REL to long form error correction result codes, CONNECT speed /REL Displays Hayes-compatible short form result codes. The result code displays the actual modem bps rate.
\V4	Enables long form error correction result codes: •CONNECT speed /REL-MNP •CONNECT speed/REL-LAPM •CONNECT speed/REL-CELLULAR The result code displays the actual modem bps rate.
\V5	Enables reporting of the modulation type: •CONNECT speed/modulation/REL-MNP •CONNECT speed/modulation/REL-LAPM •CONNECT speed/modulation/REL-CELLULAR

Connection Result Code Tables

The Cisco AS5300 access server module can also display these result codes when it attempts to establish connection. The tables use the abbreviations: rel (reliable) and non-rel (non reliable).

The following tables (Table 64 through Table 67) show the short and long form result codes, excluding connection result codes whose form depends on the \V, W, and -M commands.

•Result Codes

•Long Form Connect Result Codes (DTE)

•Long Form Connect Result Codes (Modulation Speed)

•Short Form (Numeric) Connect Result Codes (DTE Speed)

•Short Form (Numeric) Connect Result Codes (Modulation)

Table 64 Result Codes

Short Form	Long Form
0	OK
1	CONNECT
2	RING
3	NO CARRIER
4	ERROR
6 1	NO DIALTONE

1 display of these call progress monitoring result codes depends on the setting of the X command.

Table 65 Result Codes

ATV1 - M0W0 or ATV1 M0W1 Report DTE speed
DTE Speed	non-rel \V rel	\V1 rel, \V rel1 \V3 rel, \V4 rel1, \V5 rel2
75	75	75 /REL
300	300	300 /REL
600	600	300 /REL
1200	1200	1200 /REL
2400	2400	2400 /REL
4800	4800	4800 /REL
9600	9600	9600 /REL
19,200	19200	19200 /REL
38,400	38400	38400 /REL
57,600	57600	57600 /REL
115,200	115200	115200 /REL
230,400	230400	230400 /REL

1 If \V2 or \V4 are set and a reliable link is established, the message displays as one of the following formats: CONNECT <speed>/REL - MNP or CONNECT <speed>/REL - LAPM or CONNECT <speed>/REL - CELLULAR or CONNECT <speed>/REL- CELLULAR EC or CONNECT <speed> /LAPM - CELLULAR EC 2 In non-reliable V.21 or Bell 103 connections, the message displays as CONNECT.

Table 66 Result Codes 

ATV1-M0W2 Report modulation speed
Modulation	Speed	non-rel \V0 rel	\V1 rel \V2 rel1	\V3 rel \V4 rel1 \V5 rel2
V.21	300	--- 3 & 4	V.21/REL	V.21/REL
Bell 103	300	--- 3	103/REL	103/REL
V.23 half-duplex	1200	V.23 HDX4	---	---
V.23 split speed	75/1200	V.234	---	---
V.22	6004	600	600/REL	600/REL
V.22 \Bell 212A	1200	1200	1200/REL	1200/REL
V.34/V.22bis	2400	2400	2400/REL	2400/REL
V.34/V.32	4800	4800	9600/REL	4800/REL
V.34/V.32bis	7200	7200	9600/REL	7200/REL
V.34/V.32	9600	9600	9600/REL	9600/REL
V.34/V.32bis	12000	12000	9600/REL	12000/REL
V.34/V.FC/V.32bis	14400	14400	14400/REL	14400/REL
V.34/V.FC	16800	16800	16800/REL	16800/REL
V.34/V.FC	19200	19200	19200/REL	19200/REL
V.34/V.FC	21600	21600	21600/REL	21600/REL
V.34/V.FC	24000	24000	24000/REL	24000/REL
V.34/V.FC	26400	26400	26400/REL	26400/REL
V.34/V.FC	28800	28800	28800/REL	28800/REL
V.34	31200	31200	31200/REL	31200/REL
V.34	33600	33600	33600/REL	33600/REL
K56flex	32000	32000	32000/REL	32000/REL
K56flex	34000	34000	34000/REL	34000/REL
K56flex	36000	36000	36000/REL	36000/REL
K56flex	38000	38000	38000/REL	38000/REL
K56flex	40000	40000	40000/REL	40000/REL
K56flex	42000	42000	42000/REL	42000/REL
K56flex	44000	44000	44000/REL	44000/REL
K56flex	46000	46000	46000/REL	46000/REL
K56flex	48000	48000	48000/REL	48000/REL
K56flex	50000	50000	50000/REL	50000/REL
K56flex	52000	52000	52000/REL	52000/REL
K56flex	54000	54000	54000/REL	54000/REL
K56flex	56000	56000	56000/REL	56000/REL

1 If \V2 or \V4 are set and a reliable link is established, the message displays as one of the following formats: CONNECT <speed>/REL - MNP or CONNECT <speed>/REL - LAPM or CONNECT <speed>/REL - CELLULAR or CONNECT <speed>/REL- CELLULAR EC or CONNECT <speed> /LAPM - CELLULAR EC 2 If \V5 is set, the message displays in one of the following formats: CONNECT <DCE speed>/<modulation>/REL-CELLULAR CONNECT <DCE speed>/<modulation>/REL-LAPM CONNECT <DCE speed>/<modulation>/REL-MNP CONNECT <DCE speed>/<modulation>/REL-CELLULAR EC CONNECT <DCE speed>/<modulation>/REL-LAPM - CELULAR EC with the modulation /V.FC, /K56, /V.34, /V.32, /V.22, or /FSK 3 In a non-reliable V.21 or Bell 103 connections, the message displays as CONNECT. 4 Not supported in synchronous mode.

Table 67 Result Codes 

ATV0W0 or ATV0W1 Report DTE speed
DTE Speed	\V0 \V1 non-rel \V2 non-rel \V4 non-rel \V5 non-rel	\V1 rel \V2 rel \V4 rel \V5 rel	\V3
75	1	20	1
300	1	20	1
600	9	21	5
1200	5	22	5
2400	10	23	10
4800	30	31	11
9600	32	33	12
19200	36	37	14
38400	38	39	28
57600	42	43	29
115200	46	47	30
230400	48	49	51

Table 68 Result Codes 

ATV0W2 Report Modulation Speed
Modulation	Speed	\V0 \V1 non-rel \V2 non-rel \V4 non-rel \V5 non-rel	\V1 rel \V2 rel	\V3	\V4 rel \V5 rel	Non-compression
V.21 or Bell 103	300	1	20	1	20	79
V.23 half-duplex	1200	5		5		24
V.23 split speed	75/1200	11		23		24
V.22	600	9	21	5	21	21
V.22 or Bell 212A	1200	5	22	5	22	80
V.34/V.22bis	2400	10	23	10	23	81
V.34/V.32	4800	30	31	11	31	82
V.34/V.32bis	7200	401	33	24	41	83
V.34/V.32	9600	32	33	12	33	84
V.34/V.32bis	12000	441	33	25	45	85
V.34/V.FC/V.32bis	14400	341	35	13	35	87
V.34/V.FC	16800	60	61	13	61	88
V.34/V.FC	19200	36	37	14	37	89
V.34/V.FC	21600	62	63	13	63	90
V.34/V.FC	24000	64	65	13	65	91
V.34/V.FC	26400	66	67	13	67	92
V.34/V.FC	28800	68	69	13	69	93
V.34	31200	70	71	13	94	94
V.34	33600	72	73	13	95	95
K56flex	32000	130	131	15	131	160
K56flex	34000	132	133	15	133	161
K56flex	36000	134	135	15	135	162
K56flex	38000	136	137	15	137	163
K56flex	40000	138	139	15	139	164
K56flex	42000	140	141	15	141	165
K56flex	44000	142	143	15	143	166
K56flex	46000	144	145	15	145	167
K56flex	48000	146	147	15	147	168
K56flex	50000	148	149	15	149	169
K56flex	52000	150	151	15	151	170
K56flex	54000	152	153	15	153	171
K56flex	56000	154	155	15	155	172

1 When \V0 is set, the following numeric codes display: 14400 bps=34; 12000 bps=44; 7200 bps=40.

\Wn (Split Serial Port Speed)

Determines whether the serial port uses split transmit and receive speed operation when %F1 or %F2 is set to select V.23 mode. Table 69 lists command options.

Default

\W0

Table 69 Split Serial Port Speed Command Options

Command	Meaning
\W0	Disables split serial port speed
\W1	Enables split serial port speed

\Xn (XON/XOFF Passthrough)

Determines whether XON/XOFF flow control characters are sent to the remote or local modem. When XON/XOFF flow control is enabled on the serial port (\ Q1) and XON/XOFF passthrough is enabled (\X1), the modem transmits any XON and XOFF characters sent to the serial port from the local device to the remote device. Table 70 lists command options.

Default

\X0

---

Caution With \X0 (XON/XOFF passthrough) set and XON/XOFF flow control enabled, local devices such as printers can send XON and XOFF characters to the modem serial port. If the modem is controlling the flow of data to the remote system, these local flow control characters will not interfere with the connection. However, if \X1 is set, the local flow control characters also pass through to the remote system. These characters can turn on the flow of data from the remote system before the modem is ready to receive it, resulting in loss of data.

---

Table 70 XON/XOFF Passthrough Command Options

Command	Meaning
\X0	Processes XON/XOFF flow control characters
\X1	Processes XON/XOFF flow control characters and passes them to the local or remote system

# Character Command Set

This section describes modem command that begins with a # character. Table 71 lists # command options.

#En (Answer Mode Escape Sequence)

Determines detection of the escape sequence (+++) when the modem is in answer mode.

Default

#E1

Table 71 #E Command Options

Command	Meaning
#E0	Enables the escape code sequence in answer mode.
#E1	Disables the escape code sequence in answer mode.

Modem S and :T Register Summary

The modem saves configuration settings in S and :T registers similar to Hayes Smartmodem 2400 registers. Each register controls a single modem function or is bit-mapped to control several functions. This section describes commands to display and change register values. We recommend that, wherever possible, you use the following commands only to display register contents and use the AT command set to change register values.

Read All Registers

The %Rn command displays the contents of an entire register set. The register set contents are displayed as a table in decimal and hexadecimal format.

%R0 displays the contents of all S registers.

%R1 displays the contents of all :T registers.

Point to a New Reference Register

The Sn and :Tn commands set the modem register pointer to register n. Register n then becomes the reference register for following register commands.

ATSn sets the modem register pointer to S register n.

AT:Tn sets the modem register pointer to :T register n.

Read a Configuration Register

The Sn? and :Tn? commands display the contents of register n, in decimal format only. Register n becomes the reference register.

ATSn? displays the contents of S register n.

AT:Tn? displays the contents of :T register n.

Change the Value of a Register

The Sn=x and :Tn=x commands change the value of register n to x. Register n becomes the reference register.

ATSn=x changes the value of S register n to x.

AT:Tn=x changes the value of :T register n to x.

Display the Value of the Reference Register

The AT? command displays the value of the last S register referenced in a read, write, or pointer command.

Change the Value of the Reference Register

The AT=x command changes the value of the last S register referenced to x.

S Register Descriptions

This section describes the purpose and format of each S register.

S0 (Ring to autoanswer On)

Register S0 specifies the number of rings before the modem answers. Set register S0 to zero to disable autoanswer. Ring signals are ignored for 5 seconds after disconnect.

Range

0 to 255 rings

Default

1 ring

S1 (Ring Counter)

Counts the rings before the modem answers a call. If there is no ring within eight seconds of the last ring, S1 is reset to zero. Ring signals are ignored for five seconds after disconnect.

S2 (Escape Code Character)

Specifies the character used for the three-character escape code sequence. When the modem is in connect state and receives the escape code sequence, it enters command state. Setting register S2 to zero disables the escape code character. Register S12 sets the guard time that must be present before and after the escape code character.

Range

0 to 255 (ASCII decimal)

Default

43 (+)

S3 (Carriage Return Character)

Specifies the carriage return (CR) character. The carriage return terminates command lines and result codes.

Range

0 to 127 (ASCII decimal)

Default

13 (Carriage Return)

S4 (Line Feed Character)

Specifies the linefeed (LF) character. The linefeed character follows a carriage return at the end of command lines and result codes.

Range

0 to 127 (ASCII decimal)

Default

10 (Linefeed)

S5 (Backspace Character)

Specifies the backspace (BS) character.

Range

0 to 32 (ASCII decimal)

Default

8 (Backspace)

S6 (Wait Before Dialing)

Specifies the time the modem waits after transitioning off-hook before dialing. This is a minimum of two seconds, even if register S6 is set to a value less than 2. Register S6 is used only when the X0, X1, or X3 command (Extended Result Code) is set.

Range

2 to 255 seconds

Default

2 seconds

S7 (Wait for Carrier After Dial)

Specifies the time that the modem waits for one of the following:

•Carrier from the remote modem before hanging up in originate or answer mode

•Ringback, only in originate mode, and only if X3 or X4 (Extended Result Codes) is set

•Dial tone when the Wait for Dial Tone (W) dial modifier is encountered in a dial string

•Quiet answer when the Wait for Quiet Answer (@) dial modifier is included in a dial string

Range

0 to 255 seconds

Default

60 seconds

S8 (Pause Time for Dial Delay)

Specifies the time the modem waits when the pause dial modifier (,) is used in a dial string.

Range

0 to 255 seconds

Default

0

S9 (Carrier Detect Response Time)

Specifies the time that a signal must be present before the modem recognizes it as carrier. Register S9 is only used in normal and direct modes.

Range

0 to 255 (0.1-second increments)

Default

6 (0.6 seconds)

S10 (Delay for Hangup After Carrier Loss)

Specifies the time the modem waits before hanging up after loss of carrier, allowing for a temporary loss. Both modems should have equal values set. If the S10 values of the two modems are unequal, disconnection occurs when the lower value is reached. When register S10 is set to 255, the modem functions as if carrier is always present. After disconnecting, the modem waits a minimum of five seconds before going off-hook in originate mode.

---

Note Register S10 is ignored in 56 kbps, V.34, V.32, V.32 bis, V.22, and V.22 bis reliable connections.

---

Range

0 to 255 (0.1-second increments)

Default

60 (6 seconds)

S11 (DTMF Tone-Dialing Speed)

Specifies the time interval in milliseconds between tones when the modem is dialing over a tone line.

Range

50 to 100 milliseconds

Default

50 milliseconds

S12 (Escape Code Guard Time and Remote Access Attention Sequence Guard Time)

Sets the minimum quiet time before and after the three-character escape code. The interval between characters in the escape code or remote access attention sequence must be less than this guard time. If S12 is zero, the time to enter the escape code or attention sequence does not affect recognition.

In normal mode, register S12 sets the guard time that precedes and follows the attention character sequence. It should be set to the same value on both the originating and answering modems. Reliable mode uses its own timing and ignores register S12.

Range

0 to 255 (0.02-second increments)

Default

50 (1 second)

S14 (Bit-Mapped Register)

Register S14 is bit-mapped for the functions listed in Table 72.

Table 72 S14 Bit-Mapped Register

Bit	Meaning	Value
0	Not used	-
1	Command echo	0 No echo 1 Echo
2	Result codes	0 Result codes 1 No result codes
3	Result type	0 Short form 1 Long form
4	Dumb mode	0 Smart mode 1 Dumb mode
5	Dial method	0 Tone dial 1 Pulse dial
6	Not used	-
7	Originate/answer	0 Answer mode 1 Originate mode

S16 (Bit-Mapped Register for Test Options)

Register S16 is a read-only register that displays loopback test option status and is available only when the modem is in normal or direct mode. The modem does not support diagnostic tests in Bell 103, V.13, V.21, or V.23 modes. The register is bit-mapped for the functions listed in Table 73.

Table 73 Register S16 Functions

Bit	Meaning	Value
0	Local analog loopback	0 Disabled 1 Enabled
1	Not used	-
2	Local digital loopback	0 Disabled 1 Enabled
3	Remote digital loopback status (initiated by the remote modem)	0 Loopback off 1 Loopback in progress
4	Initiate remote digital loopback	0 Disabled 1 Enabled
5	Initiate remote digital loopback with self-test	0 Disabled 1 Enabled
6	Initiate local analog loopback with self-test	0 Disabled 1 Enabled
7	Not used	-

S18 (Test Timer)

Specifies the maximum elapsed time for a modem loopback diagnostic test. Register S18 is available only when the modem is in normal or direct mode. If the register is set to zero, enter the &T0 command (End Test in Progress) to end a test. Register S18 is not supported for V.54 loopback tests by switch or circuit.

Range

0 to 255 seconds

Default

0 (disables the timer)

S21 (Bit-Mapped Register)

Register S21 is bit-mapped for the functions listed in Table 74.

Table 74 Register S21 Functions

Bit	Meaning	Decimal Value
0	Telco jack	0 Default. 1 Not supported.
1	Not used	-
2	Clear To Send/ Request To Send	0 On-hook: CTS on. Off-hook: V.22 and V.22 bis CTS off until connecting. After connecting: CTS is off in response to an on-to-off RTS transition; CTS is on in response to an off-to-on RTS transition after the delay time set in register S26. 1 On-hook: CTS on. Off-hook: CTS off until connecting. After connecting: CTS on for duration of carrier signal.
3, 4	Data Terminal Ready	0 Ignores DTR. 1 On-to-off DTR transition: modem enters command state. 2 On-to-off DTR transition: modem is set on-hook. 3 On-to-off DTR transition: modem reset.
5	Data Carrier Detect	0 DCD always on. 1 DCD on indicates data carrier is present except momentarily at disconnect.
6	Not used	-
7	Long space disconnect	0 Disabled. 1 Enabled.

S22 (Bit-Mapped Register)

Register S22 is bit-mapped for the functions listed in Table 75.

Table 75 Register S22 Functions

Bit	Meaning	Decimal Value
0-3	Not used	-
4, 5, 6	Result code options	0 Same as X0 4 Same as X1 5 Same as X2 6 Same as X3 7 Same as X4
7	Make/break ratio	0 Make 39 percent, break 61 percent 1 Make 33 percent, break 67 percent

S23 (Bit-Mapped Register)

Register S23 is bit-mapped for the functions listed in Table 76.

Table 76 Register S23 Functions

Bit	Meaning	Decimal Value
0	Respond to remote digital loopback (ignored in reliable connections)	0 Disabled 1 Enabled
1, 2, 3	Serial port bps rate	0 0 to 300 bps 1 600 bps 2 1200 bps 3 2400 bps 4 4800 bps 5 9600 bps 6 19200 bps 7 38400, 57600, or 115200 bps
4, 5	Parity	0 Even 1 Space/none 2 Odd 3 Mark
6, 7	Guard tone	0 Disabled 1 550 Hz 2 1800 Hz 3 Not used

S25 (Delay to DTR and Asynchronous/Synchronous Time Delay)

The modem ignores an on-to-off transition of DTR that is less than the register S25 time delay.

Range

0 to 255 (0.01-second increments for Delay to DTR, 1 second for asynchronous mode)

Default

5 (0.05 seconds for Delay to DTR, 5 seconds for asynchronous mode)

S27 (Bit-Mapped Register)

Register S27 is bit-mapped for the functions listed in Table 77.

Table 77 Register S27 Functions

Bit	Meaning	Decimal Value
0, 1	Not supported	-
2, 3, 4, 5	Not used	-
6	Answer tone at 1200 bps	0 CCITT V.22 bis/V.22 1 Bell 212A
7	Not used	-

:T Register Descriptions

This section describes the purpose and format of each supported :T register.

:T0 (Timer for V.22 bis, V.22, and V.32 Modes During Multi-Protocol Answer)

Register :T0 sets the time limit for the modem to establish a V.32, V.22 bis, or V.22 connection before switching to establish a V.23 split speed or V.21 connection. In this time period, the modem sends V.22 bis or V.22 carrier. This register setting requires 1200-bps or higher operation with %F0%L1.

Range

0 to 255 (0.1-second increments)

Default

40 (4 seconds)

:T3 (Timer for V.21 and V.23 Answer Tone Duration)

Register :T3 is used in V.21 mode (%F0 is set and the modem speed is 300 bps) or V.23 mode (%F1, %F2, or %F3).

In answer mode, register :T3 sets the time limit for the V.25 answer tone sent by the answering modem to the originating modem. When :T3 is zero, no answer tone is sent. All V.21 and V.23 answers begin with two seconds of silence before sending an answer tone, unless :T3 is zero.

In originate mode, register :T3 sets the time the originating modem waits after detecting an answer tone before proceeding with the connection. When :T3 is zero, the originating modem does not wait for an answer tone.

Range

0 to 33 (0.1-second increments)

Default

33 (3.3 seconds)

:T4 (Timer for Line Turnaround Delay and Carrier On)

Register :T4 specifies the minimum time that the modem waits for the remote modem to respond after turning carrier off before turning carrier back on again to resume sending data. Register :T4 is used only in normal mode V.23 half-duplex connections.

Range

0 to 255 (12.5-millisecond increments)

Default

20 (250 milliseconds)

:T6 (Timer for DCD Turn On Delay)

Register :T6 specifies the time that the modem waits after it raises carrier before it starts looking for data. This register can be set to ignore noise that occurs when DCD is raised in V.23 half-duplex connections. If :T6 is set to zero, the modem waits 256 milliseconds before looking for data. Register :T6 is used only in normal mode V.23 half-duplex connections.

Range

0 to 255 milliseconds

Default

200 milliseconds

:T9 (Primary XON Flow Control Character)

Register :T9 specifies the character used for primary XON flow control on the modem and serial ports. Both modems must use the same primary flow control characters during normal connections. Use the \ Q1 or \ Q4 command (Serial Port Flow Control), and \G1 or \G2 command (Modem Port Flow Control) to specify primary flow control.

Range

0 to 255 (decimal value of an 8-bit ASCII character)

Default

17 (DC1 or 11 hexadecimal)

:T10 (Primary XOFF Flow Control Character)

Register :T10 specifies the character used for primary XOFF flow control on the modem and serial ports. Both modems must use the same primary flow control characters during normal connections. Use the \ Q1 or \ Q4 command (Serial Port Flow Control) options, and \G1 or \G2 command (Modem Port Flow Control) options to specify primary flow control.

Range

0 to 255 (decimal value of an 8-bit ASCII character)

Default

19 (DC3 or 13 hexadecimal)

:T11 (Secondary XON Flow Control Character)

Register :T11 specifies the character used for secondary XON flow control on the modem's serial port. Use the -F1\ Q1 or -F1\ Q4 commands to specify secondary flow control.

Range

0 to 255 (decimal value of an 8-bit ASCII character)

Default

249 (F9 hexadecimal)

:T12 (Secondary XOFF Flow Control Character)

Register :T12 specifies the character used for secondary XOFF flow control on the modem serial port. Use the -F1\ Q1 or -F1\ Q4 commands to specify secondary flow control.

Range

0 to 255 (decimal value of an 8-bit ASCII character)

Default

251 (FB hexadecimal)

:T14 (Connect Message Delay Timer)

Register :T14 specifies the time that the modem waits before or after a connect message before CTS, DSR, or DCD is raised. Use this register setting with the @C0 or @C1 command (CTS, DSR, and DCD Message Control options).

Range

0 to 255 (100-millisecond increments)

Default

0

:T16 (CTS Turn On Delay Timer)

Register :T16 specifies the time that the modem waits before raising CTS after DCD or DSR has been raised in connect mode.

Range

0 to 255 (12.5-millisecond increments)

Default

0

:T17 (V.32/V.32 bis Connection Training Timer)

Register :T17 specifies the time limit for exchanging training sequences when establishing V.32 and V.32 bis connections.

To reduce the time required to establish a connection (but increase the modem's sensitivity to noise on the line), set :T17 to a value less than 28.

To reduce the modem's sensitivity to noise (but lengthen the time required to make a connection), set :T17 to a value greater than 28.

Range

0, 1, or 5 to 32 seconds

Default

0 (use dynamic training sequences, equivalent to a setting of 28)

:T19 (Bit-Mapped Register)

Register :T19 specifies the MNP link control. The register is bit-mapped for the functions listed in Table 78.

Table 78 Register :T19 Functions

Bit	Meaning
0	0 Keeps a non-MNP10 1200-bps connection if no MNP link activity is received from the remote modem 1 Disconnects a non-MNP10 1200-bps connection if no MNP link activity is received from the remote modem after 2 minutes

:T22 (DSR Timer)

Register :T22 specifies the time that the modem waits before DSR transitions off after DCD or CTS transitions off in disconnect mode. For example, if \D2 (Serial Port DSR/CTS Control) and &C1 (Serial Port DCD Control) are set when DCD and CTS transition off, the modem waits for the time specified by register :T22 before setting DSR off.

Range

0 to 255 (12.5-millisecond increments)

Default

34 (425 milliseconds)

:T23 (Bit-Mapped Register)

Register :T23 is bit-mapped for the functions listed in Table 79.

Table 79 Register :T23 Functions

Bit	Meaning	Value
0, 1, 2, 3	Not used	-
4	Rate negotiation at startup	1 At the start of a V.32 connection, modem examines line quality and sets speed accordingly 2 Disabled
5, 6, 7	Not used	-

:T26 (Bit-Mapped Register)

Register :T26 is bit-mapped for the functions listed in Table 80.

Default

0
Note that the default should not be changed except when configuring country codes in modem firmware version 2.2.8 or earlier. (See Step 3 on page 32).

Table 80 :T26 Bit-Mapped Register

Bit	Meaning
0	0 Enables 2-second billing delay. 1 Disables 2-second billing delay. This setting decreases connection time but can affect establishing connections.
1	0 Enables normal answer tone length in V.32 mode. 1 Shortens answer tone length in V.32 mode.
3	0 DisablesQuick Ring detection. 1 Enables Quick Ring detection.

:T51

Register :T51 defaults to 13 and effects V.34 connections. This register was formerly reserved for Lease Line Mode Tx levels, unused in Cisco implementation.

:T52

Register :T52 has been revised to support independent V.90 Tx Power Level Adjust in firmware version 5.3.30. :T52 has been modified for the transmit power level for V.PCM (V.90) links. Default is -12 dBm for V.90 (the same as K56Plus, K56Flex 1.0, and K56Flex 1.1). The transmit level for V.90 modulation may be adjusted up or down with this register. Cisco recommends that it should be used at the default value unless performing specific fault isolation testing.

:T89 (PoS Configuration)

Register :T89 was implemented with version 3.2.10 and has been revised for firmware version 5.3.30. :T89 works in conjunction with :T120 (Answerback Tone Duration) and :T121 (Answerback Tone Configuration for PoS). For more information, see "PoS Support," page 85). Table 81 lists register :T89 configurations.

Bit 1 of :T89 is now defaulted to a 1 (:T89=2). This forces a Normal Mode connection at 300 baud. By turning off this bit, MNP connections will be attempted. If the bit is on (answer modem), and the originate modem is set to \N2, no connection will result.

Set :T89 = 6 for standard PoS devices. For specialized PoS devices using 1650Hz to Quick Connect, set :T89 = 22 (bits 1+2+4 set).

---

Note Do not set bit position 3 unless testing in V.21 Leased Mode specifically.

---

To support Bell 103 PoS terminals, set :T89 to 7. To support V.21 PoS terminals, set :T89 to 6. If V.23 is supported and PoS/QUICK 300 is not, NORMAL mode will be forced in the case of a V.23 connection (:T89 has no effect in this case). Use the following:

•ITU V.21/V.22

•Forced Normal Mode at 300/1200

•S9 Register Delay before recognizing Carrier.

•2100 Hz Answerback Tones.

---

Note If you are running firmware version 5.x.xx, and you want to configure POS, set :t110 = 46.

---

Default

0010 (0x2).

Table 81 Register :T89 Configurations

Bit	Description	Meaning
0	ITU or Bell Mode	0 ITU (See B0) 1 Bell (See B1)
1	300/1200 Normal	0 Attempt EC 1 Normal Mode, No EC
2	S-Reg 9 DCD Recognition Delay	0 Use S9 1 Ignore S9
3	Constant 1650 Hz Tone	0 2100 Hz ABT 1 Constant 1650 Hz
4	Initial 1650 Hz Tone	0 2100 Hz ABT 1 Timed 1650 Hz

:T110 (Select V.8 or V.8 bis Modem Exchange Register)

Register :T110 has been revised to default 0d36 matching server-client reported rates over Robbed bit signaling (RBS) in firmware version 5.0.xx.

Default

:t110 = 4 (V.8bis enable, K56Flex. Default for version 3.2.10)

:t110 = 6 (V.8 enable, K56Flex. Default for version 3.1.30)

:t110 = 44 (K56Flex/V.90. Default for version 5.0.20 and later)

---

Note If you are running Firmware release 5.0.xx, and you want to disable both Rockwell K56 implementations (K56Flex and K56Plus), set :T110 to 38 decimal and :T124 to 11 decimal.

---

:T114 (56KFlex Control Register)

Register :T114 is used by 56-kbps modems to control/configure the modem for CT1 or PRI operation as listed in Table 82.

Default

1

Table 82 Register :T114 Configurations

Bit	Meaning
0	0 Disable K56Flex 1 Enable K56Flex
1	0 Normal Power (-12 dB) 1 High Power in A-Law (-6dB)

:T120 (Answerback Tone Duration)

Register :T120 is implemented with version 3.2.10. This register works in conjunction with :T89 (PoS Configuration). For more information, see "PoS Support," page 85.

The default 0x19 = 0d25 for 2500 msec of 1650Hz tone by default. The project requirement is for this to be configurable for a range between 1500 msec and 3000 msec (1.5 sec. to 3.0 sec.). The actual range for the register is from 0 to 3100 msec (0 to 3.1 sec.) with the default being 2.5 seconds, which is deployed in the field at this time. When setting bit 4 of :T89, the value of :T120 is used for the duration of the tone.

Default

11001 (0x19, 25 decimal) for 2500 milliseconds of 1650 Hz tone. See Table 83.

Table 83 :T120 Answerback Tone Duration

Bit	Meaning
0	1
1	0
2	0
3	1
4	1

:T121 (Answerback Tone Configuration for PoS)

Register :T121 is implemented with version 3.2.10. This register works in conjunction with :T89 (PoS Configuration). For more information, see "PoS Support," page 85. Table 84 lists :T121 answerback tone configurations.

The default 0x1B = 0d27 for 2700 msec Answerback Tones by default. The project requirement is for this to be configurable for a range between 2500 msec and 3600 msec (2.5 sec. to 3.6 sec.). The actual range for the register is from 100 to 25500 msec (.1 to 25.5 sec.) with the default being 2.7 seconds, which is deployed in the field at this time.

Default

11011 (0x1B, 27 decimal) 2700 milliseconds answerback tones.

Table 84 :T121 Answerback Tone Configuration

Bit	Meaning
0	1
1	1
2	0
3	1
4	1

:T124 (K56PLUS/V.90 Control)

Register :T124 is implemented with version 5.0.xx. Setting this register to 11 decimal disables K56Plus. Table 85 lists :T124 configurations.

---

Note To fully disable both Rockwell K56 implementations (K56Flex and K56Plus), set :T110 = 38 and :T124 = 11.

---

Default

43 (Decimal)

Table 85 :T124 K56PLUS/V.90 Control Configurations

Bit	Meaning
0	0 Disable V.90 1 Enable V.90
1	(must be 1)
2	(must be 0)
3	(must be 1)
4	(must be 0)
5	0 Disable K56Plus 1 Enable K56Plus (V.8 use PN + ID)

:T127

Register :T127 supports server Rx aggression/nonaggression rate control in firmware version 5.3.30. This register may be used to eliminate cases of speed throttling or excessive V.42 receive errors on marginal circuits. Table 86 lists new bits for register :T127.

Register :T127 has 3 new bits defined (the default is still 0). Bits 2 and 3 are used to reduce the receive speeds for V.90, Flex and V.34 modulations. This is one of the enhanced Cisco Access Server features incorporated under CSCdk89980. Bit 4 is used to disable Digital Pad compensation. Set bit 4 = 1 to disable (CSCdk90934).

A workaround has been added to resolve an issue regarding Lucent-based V.90 clients making excessive (could be as high as 50% depending on client and firmware revision) normal mode connections when the client is set to defaults (S109=1). This client default will negotiate a V.90 or K56flex connection and allow the V.8bis handshake. V.90 was being advertised by the server modem by bit 1 in octet 15 of V.8bis (octet 15 sent as 83). The workaround is to clear this bit (octet 15 sent as 81) which will force a K56flex connection for Lucent clients ONLY. The current K56flex implementation does not have an issue of connecting in Normal mode, therefore connections will be more stable.

Bit 1 of :T127 controls the workaround. The default is zero (:T127=0). To disable the workaround, set :T127=2 (set bit 1).

Table 86 New Bits for Register :T127 (Nonaggressive Settings)

Bit 3	Bit 2	Meaning
0	0	Do not reduce speed (default)
0	1	Reduce speed by 1 rate (2400 bps)
1	0	Reduce speed by 2 rates (4800 bps)
1	0	Reduce speed by 3 rates (7200 bps)

Debugging

The @E command (detailed modem call status) is an unofficially supported modem status and debugging command that can be used by an experienced user to verify the detailed status of the modem during or after a call. The content of this command might change as required to assist in problem resolution. Therefore, the command might produce results that differ from the description in this section.

The @E0 command results in a single-screen display (press any key for the next screen). The @E1 command results in continuous screen display. Press Ctrl-X or Break to cancel the display.

This section provides two sample reports generated by V.34 and 56K modems. For an explanation of the report, see Table 86. Note that some empirical quality data is provided to assist in the interpretation of this measured data, and the fields change with new firmware releases.

A sample of the @E report generated by a V.34 modem (version 2.2.8 firmware) follows:

at@e1

MNP Class 10 V.34/V.FC Modem 

MODEM HW: OEM 2W United States

Firmware Rev 2.2.8/85

Bootstrap Rev 1.0.5

DSP C36 Part/Rev              3035 4241

DSP C58 Part/Rev              3035 2041

NET ADDR:      FFFFFFFFFFFF

Connect Time HH:MM:SS         000:02:01

4 RTS 5 CTS 6 DSR - CD 20 DTR - RI 

Disconnect  Remote -   Local - 14,10,9

CONNECTION STATUS             

Mod Type                      IDLE

TX/RX Spd                     600 600 BPS

TX/RX Spd Mask                   NA  0000 Hex

TX/RX Symbol Rate              2400  2400 Hz

TX/RX Carrier Frequency        1800  1800 Hz

TX/RX Trellis Code States        16    16

TX/RX Nonlinear Encoding        OFF   OFF

TX/RX Precoding                 OFF   OFF

TX/RX Shaping                   OFF   OFF

TX Preemphasis Index              0

TX Lvl Reduction                  0 dB

Secondary Channel               OFF

LINE IMPAIRMENTS              

TX Lvl REG                     - 10 dBm

TX Lvl RAM                     -  0 dB

TX Lvl Reduction                  0 dB

TX Lvl                         - 10 dBm

RX Lvl                         - 16 dBm

Signal/Noise Ratio                0

Signal/Distortion Ratio           0

Eye Quality                    0000 Hex

Lower Band Edge                   0 Hz

Upper Band Edge                   0 Hz

Phase Jitter Freq                 0 Hz

Phase Jitter Amp                0.0 deg

Far Echo Offset (Phase Roll)    0.0 Hz

Far Echo Lvl = 20log(N)-81        0 N

Round Trip Delay                  0 msec

Dropouts > 5dB                    0

RTRNs Initiated                   0

RTRNs Accepted                    0

Rate Changes Initiated            0

Rate Changes Accepted             0

FF Trip/Block Error Rate       0000 Hex

EQM FUNCTION STATUS           

AVG EQM Filter Pole            8A25 Hex

EQM Gain                       8A4E Hex

EQM Offset                     8A77 Hex

AVG EQM Filter Pole            8AA0 Hex

AVG EQM Baud Interval          8AC9 Hex

AVG EQM Sample Size            8AF2 Hex

AVG EQM                        8B1B Hex

EQM Threshold Lvl              8B44 Hex

OK

A sample of the @E report generated by a 56K modem (version 3.1.30 firmware) follows:

at@e1

MNP Class 10 K56flex Modem

MODEM HW: OEM 2W United States

Firmware Rev 3.1.30/85

Bootstrap Rev 3.0.4

DSP C36 Part/Rev              3635 4241

DSP C58 Part/Rev              3635 2041

DSP Controller Rev            0101

DSP Data Pump Rev             0101

NET ADDR:      FFFFFFFFFFFF

Connect Time                  000:00:06

4 RTS 5 CTS 6 DSR 8 CD 20 DTR - RI

 Disconnect  Remote -   Local -

Mod Type                      K56

TX/RX Spd                     56000  31200 BPS

TX/RX Spd Mask                   NA  BFFF Hex

Symbol Rate                    3200 Hz

TX/RX Carrier Freq             1829  1829 Hz

TX/RX States                     16    16

TX/RX NLE                       OFF    ON

TX/RX Precoding                 OFF    ON

TX/RX Shaping                   OFF    ON

TX Preemphasis Index              0

TX Lvl REG                     - 13 dBm

TX Lvl RAM                     -  0 dB

TX Lvl Reduct                     0 dB

TX Lvl                         - 13 dBm

RX Lvl                         - 14 dBm

S/NR                             47

S/DR                              0

 EQM                            1E00 Hex

AVG EQM                        1E0D Hex

Lower/Upper Edge                150  3825 Hz

Phase Jitter Freq               127 Hz

Phase Jitter Amp                0.0 deg

Far Echo Lvl                  24592 N

Round Trip Delay                  0 msec

Dropouts > 5dB                    0

RTRNs Init/Accept                 0     0

RRENs Init/Accept                 0     0

BLER                           0000 Hex

RBS Counter                    000E Hex

Digital Pad Detected           0000

OK

Table 87 provides a description of components of the report. Note that the table does not include self-explanatory fields.

Table 87 Debugging Component Report 

Field	Description
Firmware Rev	Current firmware version
Bootstrap Rev	Current Boot version
DSP C36 Part/Rev	Current DSP version
DSP Controller Rev1	Current DSP hardware
DSP Data Pump Rev1	Current DSP controller pump
Mod Type	Modulation type—specifies which modulation standard is being implemented on the current connection. If no connection is established, it will read IDLE.
TX/RX Spd	TX/RX Speed—specifies the transmitter and receiver modulation speeds for the current connection. The TX/RX speeds may be different for operating modes that support split-speed operation, such as V.34. Given in bits per second.
TX/RX Spd Mask	TX/RX speed mask—a hex number that shows which speeds the Rockwell DSP is configured to support on a given connection. For V.34, the LSB represents 2400 bps (1=on, 0=off); the next significant bit represents 4800 and so on up to 33.6 kbps.
Symbol Rate	TX/RX symbol rate—a hex number that shows which symbol rate (analog signal event rate) the Rockwell DSP is currently using. For most modes, this will be a fixed number, but V.34 for example will negotiate any of 6 different rates from 2400 to 3429 symbols/second.
TX/RX Carrier Freq	TX/RX carrier frequency—a single-frequency sinusoid that is modulated to transmit binary information in accordance with the selected operating modes. This also will usually be a fixed number except for V.34 where 9 different ones can be chosen. In the V.34 case, a low and a high carrier are available for each of the symbol rates. The appropriate symbol rate and its associated carrier will be selected by the modem during the startup sequence. Given in Hertz.
TX/RX States TX/RX Trellis Code States	TX/RX Trellis states—Trellis Encoding is a method for improving noise immunity using a convolutional coder to select a sequence of subsets in a partitioned signal constellation. The trellis encoders used in the V.34 Recommendation are used in a feedback structure where the inputs to the trellis encoder are derived from the signal points. For V.34, this parameter tells whether 16, 32, or 64 state encoding is being used.
TX/RX Nonliner Encoding TX/RX NLE	TX/RX nonlinear encoding—a method for improving distortion immunity near the perimeter of a signal constellation by introducing a non-uniform two-dimensional (2D) signal point spacing.
TX/RX Precoding	TX/RX precoding—a nonlinear equalization method for reducing equalizer noise enhancement caused by amplitude distortion. Equalization is performed at the transmitter using precoding coefficients provided by the remote modem.
TX/RX Shaping	TX/RX shaping—a method by which the noise margin of a modem signal can be maximized by forming signal constellations in high-dimensional spaces thereby reducing the average signal power. V.34 modems use a shell mapping mechanism to achieve a near-spherical signal constellation, yielding a shaping gain of around 1 dB.
TX Preemphasis Index	TX pre-emphasis index—reads the remote modem's PRE-emphasis Request byte value. Pre-emphasis is a linear equalization method where the transmit signal spectrum is shaped to compensate for amplitude distortion. The pre-emphasis filter is selected using a filter index provided by the remote modem; the filters conform to the 11 types outlined in the ITU specifications for the given operating mode.
Secondary Channel2	Secondary channel—tells whether the secondary channel is on or off. The auxiliary channel is a reduced bandwidth data channel which, along with the primary channel, is multiplexed into the bit stream transmitted by the modem. Data conveyed in the auxiliary channel is independent from the primary channel and may consist of secondary channel data and modem control data. The secondary channel is a portion of the auxiliary channel that is made available to the user.
Line Impairments
TX Lvl REG	Transmit level register—tells what transmit level the modem is configured for. Given in dBm (decibels referenced to 1 milliwatt through 600 ohms).
TX Lvl RAM	Transmit level RAM—tells what amount of transmit level gain the modem is configured for. The gain may be positive or negative and is used to adjust the transmit level separately from the transmit level configuration. Given in dBm.
Tx Lvl Reduction TX Lvl Reduction	Transmit level reduction—tells what, if any, reduction in transmit level (power drop) has been negotiated by the modems during handshake. Given in dBm. Valid in V.34 mode only.
TX Lvl	Transmit level —tells what transmit level the modem actually uses; consists of the configured level plus the tx level gain minus the negotiated power drop. Given in dBm.
RX Lvl	Receive level—tells what signal level the modem receiver is detecting. Given in dBm. The following table gives a range of common values for V.34: -15 to -25 dBm (excellent/optimum) -26 to -30 dBm (good) -31 to -35 dBm (fair) -36 to -42 dBm (poor) -43 to -48 dBm (connect/no connect threshold)
Signal/Noise Ratio S/NR	Signal/noise ratio—tells what ratio or margin exists between the received signal level and the noise level detected by the receiver. Given in dBm. The following table gives a range of common values versus connect speed (V.34):     SNR Typical V.34 connect speed *     >=46 dBm 33600     45 dBm 31200     44 dBm 28800     42 dBm 26400     39 dBm 24000     35 dBm 21600     32 dBm 19200     31 dBm 16800     29 dBm 14400     27 dBm 12000     24 dBm 9600     22 dBm 7200     19 dBm 4800     16 dBm 2400 * These are empirical values measured in the absence of other impairments. Actual values may vary. Ideal conditions use ISDN-PRI.
Signal/distortion ration S/DR	Signal/distortion ratio—tells what ratio or margin exists between the received signal level and the harmonic distortion level detected by the receiver.
Eye Quality EQM	Eye quality measurement—represents the quality of the analog signal. A low number indicates good quality with 0 being the best possible; a high value is considered poor. The modem uses EQM in its rate decision mechanism. Given as a hex number. The following table gives a range of common values (V.34): < 1000 (good) to 2000 (fair) to 3000 (poor)
AVG EQM	Average eye quality—the output of the EQM averaging mechanism. Initial value is 0000 Hex.
Lower/Upper Edge	Lower band edge/upper band edge—the channel low and high bandwidth edge estimates (in Hertz) generated by the V.Fast/V.34 handshake probing.
Phase Jitter Freq	Phase jitter frequency—Phase Jitter is a deviation in the phase of an analog signal having frequency in Hertz and a magnitude in degrees. It results in a pure tone having an associated FM spectrum. In some cases, this spectrum is random and in others it takes the form of discrete multiples and submultiples of AC power frequencies. It can be caused by coupling through from power line associated equipment such as ringing generators. </