Table Of Contents
AT Command Set and Register Summary for Analog Modem Network Modules
Sn? (Read Configuration Register)
Wn (Connection Speed Reporting)
^V (Display Bootstrap Revision)
%An (Autoreliable Fallback Character)
%Gn (Independent Serial Port and Modem Port Speed)
Modem Connection Modes Using Speed Matching
%V (Display Modem Firmware Version)
&W (Store Current Configuration)
)Mn (Power Level Adjustment for Cellular Telephone Connections)
*W (Store Complete Configuration)
Changing Country Codes on Microcom Modems
-Mn (MNP Class Connect Messages)
-Qn (Fallback Modulation Speed)
-Vn (Split Modem Port Speed with Multiprotocol Autoanswer)
:Tn? (Read Configuration Register)
@Cn (CTR, DSR, and DCD Connect Message Control)
@E (Detailed Modem Call Status)
@Mn (Select Transmit Level for Cellular Connections)
@Un (Minimum Connection Speed)
\Dn (Serial Port DSR/CTS Control)
\F (Display Stored Phone Numbers)
\Pn {dial string} (Store a Telephone Number)
\ Qn (Serial Port Flow Control)
\Rn (Serial Port Ring Indicator)
\Vn (Error Correction Result Code Form)
#En (Answer Mode Escape Sequence)
Modem S and :T Register Summary
Point to a New Reference Register
Change the Value of a Register
Display the Value of the Reference Register
Change the Value of the Reference Register
S3 (Carriage Return Character)
S7 (Wait for Carrier After Dial)
S8 (Pause Time for Dial Delay)
S9 (Carrier Detect Response Time)
S10 (Delay for Hangup After Carrier Loss)
S12 (Escape Code Guard Time and Remote Access Attention Sequence Guard Time)
S16 (Bit-Mapped Register for Test Options)
S25 (Delay to DTR and Asynchronous/Synchronous Time Delay)
:T0 (Timer for V.22bis, 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.32bis Connection Training Timer)
:T120 (Answerback Tone Duration)
:T121 (Answerback Tone Configuration for PoS)
Example of Modemcap Creation, Assignment, and Audit
Obtaining Technical Assistance
Obtaining Additional Publications and Information
AT Command Set and Register Summary for Analog Modem Network Modules
This document describes AT commands and S and :T registers for 8-port and 16-port analog modem network modules for the Cisco 2600 series, Cisco 3600 series, and Cisco 3700 series of modular routers.
If you have questions or need help, refer to the "Obtaining Technical Assistance" section for further information.
This document contains the following sections:
•Modem S and :T Register Summary
•Obtaining Technical Assistance
•Obtaining Additional Publications and Information
Entering AT Commands
Table 1 shows how to enter AT command mode.
Note ATA, ATO, ATD, and all dial modifiers are invalid in direct-connect sessions.
•All commands except A/ (Repeat Last Command) and +++ (Escape Code) are preceded by the AT prefix and are run when you press Return or Enter.
•Enter commands as either uppercase or lowercase, but 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 0. 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.
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 "# Character Command Set" section.
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)
Repeats the last command. A/ is not preceded by the AT prefix and is not followed by 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 ITU or Bell connection mode 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 MeaningB0
ITU V.22 standard at 300 and 1200 bps, international default1
B1
Bell 212A standard at 300 and 1200 bps, USA default
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 16175551234To 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 5-sec 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.
Blacklisting
In Japan only, the analog modem network modules provide the blacklisting feature. If no remote modem is detected in three dial attempts to the same number in a three-minute period, the originating modem is prevented from dialing that number for the next three minutes.
En (Command Echo)
Configures the modem to echo commands to the workstation. Table 4 lists command options.
Defaults
E1
Table 4 Command Echo Options
Command MeaningE0
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.
On (Enter Connect State)
Sets the modem to connect state. Table 6 lists command options.
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.
Defaults
Q0
Sn? (Read Configuration Register)
Displays the contents of S register n (where n is a decimal number).
Related Commands
0 to 27
Defaults
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.
Defaults
V1
Table 8 Result Code Form Command Options
Command MeaningV0
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 is displayed for any Wn command option. Table 9 lists command options.
Defaults
W2
Table 9 Connection Speed Reporting Command Options
Command MeaningW0
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.
Defaults
X4
Note The W dial modifier causes a wait for dial tone regardless of the Xn command setting.
Yn (Long Space Disconnect)
Configures the modem to send a 4-sec Break on receipt of an H command (see the "H (Hang Up)" section). 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 4-sec 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.
Defaults
Y0
Z (Reset)
Hangs up the telephone line, clears the modem and the serial port buffers, and restores any settings that have been 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 modem Flash memory.
^V (Display Bootstrap Revision)
Displays the modem Flash memory bootstrap revision.
Dollar Command Set
This section describes modem commands that begin with a dollar ($) character.
$Bn (Serial Port Bps Rate)
This command is provided for compatibility and has no effect.
Related Commands
75, 300, 600, 1200, 2400, 4800, 9600, 19200, 38400
Defaults
$B38400
$D (Power-Up Diagnostics)
Runs power-up diagnostics.
Percent Command Set
This section describes modem commands that begin with a percent (%) character.
%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.
Caution Do not use the settings n = 63 or n = 126. They interfere with V.42.
Related Commands
0 to 127 (ASCII decimal)
Defaults
%A0 (autoreliable fallback character is disabled)
%Bn (Modem Port Bps Rate)
Sets the modem port data rate. Downshifting can still occur.
The %Bn command is affected by the following %Gn command (Independent Serial/Modem Port Speed) options:
•If %G0 is set, the modem port speed is matched to the serial port speed, regardless of any previous %Bn setting. Setting %M has no effect on %B. See the "%Mn (Modulation Selection)" section.
•If %G1 is set, the modem speed changes only when a %Bn command is entered. %B is then limited to the maximum data rate selected by %M. See the "%Mn (Modulation Selection)" section.
Related Commands
300, 600, 1200, 2400, 4800, 7200, 9600, 12000, 14400, 16800, 19200, 21600, 24000, 26400, 28800, 31200, 33600 bps
Defaults
%B33600
%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.42bis 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.
Defaults
%C3
%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 (see the "H (Hang Up)" section), the modem attempts for n sec to empty its transmit buffer before disconnecting. When carrier transitions off, the modem attempts for n sec 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 might not empty before disconnecting if %E1 (Autoretrain) is set during normal mode connections at 2400 bps or higher.
Related Commands
0 to 255 sec
Defaults
%D0
%En (Autoretrain)
Sets the modem to resynchronize (autoretrain) the number of times specified in the :T79 register 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.
Defaults
%E1
%Fn (V.23 Mode)
Configures the modem for V.23 mode. Table 14 lists the V.23 command options.
Defaults
%F0
%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.
Defaults
%G0
Table 16 lists commands to select modem protocols up to 14400 bps. If %G0 is set, the modem port speed is locked to the serial port speed. If two protocols are available at the same speed, you must also set Bn to select ITU or Bell.
If %G1 is set, you must enter a %Bn command to update the modem port speed. If two protocols are available at the same speed, you must also set Bn to select ITU or Bell.
To enable modem port speeds above 14400 to 33600 bps, %M2 must be set. %Bn then sets the modem port speed.
%Ln (Speed Matching)
Configures the modem to use speed matching when establishing a connection. Table 17 lists options.
Defaults
%L1
Modem Connection Modes Using Speed Matching
The following tables list protocols that the modem can establish with %L1 or %L3 set. Table 18 lists protocols that are established if a router modem originates the call. Table 19 lists protocols that are established if a router modem answers the call.
Restricted Speed Matching
Use the %L0 or %L2 command options on both originating and answering modems to restrict the connection speed. Table 20 lists connection speeds using the %L0 partial speed matching option. Table 21 lists connections speeds using the %L2 speed matching disabled option. If %L2 is set, the modem speed matches the closest possible connection speed.
%Mn (Modulation Selection)
Sets the upper modulation used in connections. Setting %M causes %B to be set to the maximum data rate for that modulation. Table 22 lists command options.
Defaults
%M2
%Rn (Read All Registers)
Displays the contents of modem S and :T registers as a table of values in decimal and hexadecimal format. Table 23 lists command options.
The following display is an example of the %R command:
at%r0REG DEC HEX REG DEC HEXS00 001 01H S14 138 8AHS01 000 00H S15 000 00HS02 043 2BH S16 000 00HS03 013 0DH S17 000 00HS04 010 0AH S18 000 00HS05 008 08H S19 000 00HS06 002 02H S20 000 00HS07 060 3CH S21 048 30HS08 002 02H S22 118 76HS09 006 06H S23 030 1EHS10 060 3CH S24 000 00HS11 075 4BH S25 005 05HS12 050 32H S26 001 01HS13 000 00H S27 064 40HS13 000 00H S27 064 40HOK%Un (Clear Serial Port Speed)
Sets the serial port speed. Table 24 lists command options.
Defaults
%U1
%V (Display Modem Firmware Version)
Displays the modem firmware version and country code. (For country code listings, see Table 37 on page 30.)
Defaults
%V1
Table 25 Display Modem Firmware Version Options
Command Meaning%V1
Provides detail to the x.x.x level
%V0
Provides detail to the x.x level
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 26 lists command options. See also the \Dn command.
Defaults
&C1
&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 5 sec after disconnect are ignored. Table 27 lists command options.
Defaults
&D3
&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 28 lists command options.
Defaults
&G0
Table 28 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
&Ln (Leased Line)
Sets leased line mode. Table 29 lists command options.
Defaults
&L0
&Pn (Dial Pulse Ratio)
Sets the ratio of off-hook (make) to on-hook (break) time that the modem uses for pulse dialing. Table 30 lists command options.
Note Pulse dialing is not supported in Japan.
Defaults
&P0
Table 30 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 31 lists command options.
Defaults
&S0
&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. lists command options.
Defaults
&T5
&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.
Note The &W and *W commands share the same stored configuration area. Either of these commands overwrites the other's stored settings. The *W command 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 settings stored by *W for the restricted registers are not saved during power-down.
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 33 lists command options.
Defaults
)M0
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).
Defaults
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.
Note The &W and *W commands share the same stored configuration area. Either of these commands overwrites the other's stored settings. The *W command 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 settings stored by *W for the restricted registers are not saved during power-down.
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 34 lists command options.
Note Repeat dialing is not supported in Japan.
The dial string contains up to 98 characters. Valid dial string characters are 0-9, the dial modifiers listed in Table 3 on page 4, and the # and * characters for tone dial. The modem ignores invalid characters.
-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 35 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.
Defaults
-E0
Table 35 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 (Smart or Dumb Mode)
Configures the modem to smart mode (recognize commands on the DTE port and send result codes) or dumb mode (ignore commands on the DTE port and do not send result codes). Table 36 lists command options.
Defaults
-H0
-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 37 lists country codes.
Country codes that are set manually (that is, not following the procedure described in the next section) remain in effect until one of the following events occurs:
•Another -I command is sent.
•The firmware is reloaded. (Firmware reloads always reset the country code to USA.)
•The router is power cycled.
•The router is reloaded.
Note You can also set country codes using the Cisco IOS modem country command. For more information, see the Cisco IOS configuration guides and command references. The modem country command takes effect immediately, but all active calls are dropped.
Changing Country Codes on Microcom Modems
This section describes how to change the country code for analog modem network modules. 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
•Thailand
If you are using the modems in a different country, you must change the country code. Some countries also require additional configuration.
Configure
Follow these steps:
Step 1 Enter global configuration mode:
Router#
enableRouter#
config termEnter configuration commands, one per line. End with CNTL/Z.Router(config)#
Step 2 Edit the new modemcap and specify the country code and reset (-InZ) in the miscellaneous attributes field. Replace n with one of the country codes listed in the Country Code column of Table 37. 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 37 Country Codes
Country Country Code Country Code Displayed in BannerAustralia
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 (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. By default these country codes answer on the second ring (S0=2).
a. Edit the modemcap to asnswer calls on the second ring:
Router(config)#
modemcap edit micro_czech autoanswer s0=2b. Enter the :T26=8 command. Note that you must reenter the country code too. Whenever you modify an attribute field, you must re-enter all values. New values are not appended to existing values.
Router(config)#
modemcap edit micro_czech miscellaneous :T26=8-I18ZRouter(config)#
exitRouter#Step 4 If you are using the modem in Malaysia, add the following modemcap miscellaneous entry:
Router(config)#
modemcap edit micro_malaysia miscellaneous :T93=10:T94=8ZRouter(config)#
exitRouter#Step 5 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 termRouter(config)#
line 1 48Router(config-line)#
modem autoconfigure type micro_czechMessages appear while the modems are reconfigured using the new modemcap. When the last message appears, press Return:
...3w5d: TTY48: Done with modem configurationStep 6 Save the configuration changes to NVRAM:
Router(config-line)#
Ctrl-ZRouter# 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_czechModemcap values for mcom_czechFactory 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): -i18zTemplate 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 confmodemModem Configuration Database debugging is onRouter# debug modemModem control/process activation debugging is onRouter#Step 2 Clear an idle line:
Router#
clear line 1[Confirm]OKDTR drops and modem autoconfigure runs when the modem is reset. It may take a little while before the messages appear:
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 configurationStep 3 Verify that the country code has changed by entering the IP address of your LAN interface and port 2000 + n, where n is the modem line number:
Router# telnet 172.16.10.1 2001You are now entering AT command mode on modem (slot 0 / port 0).at%v1MNP Class 10 V.34 Modem Rev x.x.x/91OKLocate "91" in the "Country Code Displayed in Banner" column of Table 37. Note that it identifies the Czech/Slovak Republic.
Step 4 Enter the disconnect command to exit the modem session:
Router# disconnect line 1Router#
-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 38 lists command options.
Defaults
-J1
Table 38 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.42bis compression instead of LAPM. Table 39 lists command options.
Defaults
-K1
-Mn (MNP Class Connect Messages)
Determines whether MNP class connect messages are displayed. Table 40 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
Defaults
-M0
-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 41 lists command options.
You can also use the -On command to change the serial port parity while the modem is 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 D command, as part of the same command line.
The AT sequence cannot be used to match space parity; instead no parity is set. You must enter -O3 to set space parity.
Defaults
-O4
-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 42 lists command options.
Defaults
-P1 (Japan)
-P0 (elsewhere)
-Qn (Fallback Modulation Speed)
Configures the modem to fall back from a V.32bis or V.32 MNP reliable connection at 14400, 9600, 7200, or 4800 bps to a V.22bis 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 43 lists command options.
Fallback from a V.32bis or V.32 MNP reliable connection to V.32bis 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).
Defaults
-Q2
-Vn (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).
Defaults
-V1 for USA
-V0 for international
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 45 lists command options.
Defaults
:D0
:En (Compromise Equalizer)
Configures the modem to use the compromise equalizer when it connects in V.32 mode. Table 46 lists command options.
Defaults
:E1
: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 47 lists command options.
Defaults
@C0
Table 47 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 unsupported modem status and debugging command that an experienced user can use to verify the detailed status of the modem during or after a call. This command may be modified from time to time and may produce results different from those described in this document. For more information, see the "Debugging" section.
@Mn (Select Transmit Level for Cellular Connections)
Selects the initial transmit level for the connection. You can set levels from -10 to -35 dBm (decibels referred to 1 milliwatt). From @M10 to @M35, the level is the as -n dBm. Table 48 lists selected transmit level command options.
Defaults
@M0
Table 48 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)
Selects the minimum speed for the connection. You can set the speed n for 300, 600, 1200, 2400, 4800, 7200, 9600, 12000, 14400, 16800, 19200, 21600, 24000, 26400, or 28800 bps.
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 49 lists command options.
Defaults
\A3
Table 49 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 ms (100-ms increments). In a reliable link, Break is always sent for 300 ms. Use the O command (Enter Connect State) to return to connect state. See also the "\Kn (Break Control)" section.
Related Commands
1 to 9
Defaults
\B3 (300 ms)
\Cn (Autoreliable Buffer)
Configures the modem to buffer data in autoreliable, autoanswer mode. The answering modem data buffer can be used to store data during the 3-sec link negotiation for a reliable connection. Table 50 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-sec autoreliable window to expire before data can pass. See the
"\Nn (Operating Mode)" section 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 can result when bps rate adjust is disabled (\J0).
Defaults
\C0
Note When either \C1 or \C2 is set, reliable and normal connections can result regardless of bps rate adjustments.
\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 51 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.
Defaults
\D0
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 52 lists command options and signal level results.
\En (Data Echo)
Configures the modem to echo characters sent from the local workstation in connect state. Table 53 lists command options.
Defaults
\E0
\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 54 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.
Defaults
\G0
\Jn (BPS Rate Adjust)
Automatically adjusts the speed of the serial port to match the speed of the connection. Table 55 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 that the serial port stays at 115200 bps.
Defaults
\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 55 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 "%Un (Clear Serial Port Speed)" section 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 56 describes the effect of n. The modem can buffer as many as four Breaks on both the modem port and the serial port.
Defaults
\K5
Note In reliable link connect state, the sending modem's Break control setting determines how the receiving modem handles the Break.
Table 56 Break Control Command Options
Command Local DTE Sends Break During Reliable or Normal Connection Local DTE Sends \B n, to 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
Modem enters command state; no Break to the remote system.1
Empties data buffers; sends Break to the remote system.
SendsBreak to the remote system; sets modem to command state.
Empties data buffers; sends Break to serial port.
\K1
Empties data buffers; sends Break to the remote system.
Same as \K0.
Sends Break to the remote system.
Same as \K0.
\K2
Same as \K0.
Immediately sends Break to the remote system.
Same as \K0.
Immediately sends Break to serial port.
\K3
Immediately sends Break to the remote system.
Same as \K2.
Same as \K1.
Same as \K2.
\K4
Same as \K0.
Sends Break to the remote system in sequence with any transmit data being buffered.
Same as \K0.
Sends Break to the serial port in sequence with receive data being buffered.
\K5
Sends 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 "\Bn (Transmit Break)" section for details.)
\Nn (Operating Mode)
Selects the modem operating mode. Table 57 lists command options.
Defaults
\N3
Note You can set the operating mode for a single call using dial modifiers. See Table 3 on page 4 for details.
Table 58 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 58, 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 58 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 as many as 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 59 lists command options.
Defaults
\ Q3
\Rn (Serial Port Ring Indicator)
Controls the Ring Indicator (RI) signal. RI follows the incoming ring signal on the telephone line. Table 60 lists command options.
Defaults
\R1
\Sn (Read Online Status)
Displays a list of modem commands and their current settings, active connection type, elapsed connect time, and 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). The following display is an example of \S1 command output with factory default settings:
at\s1IDLE 000:02:01LAST DIAL t1714756,0947NET ADDR: FFFFFFFFFFFFMODEM HW: OEM 2W United States4 RTS 5 CTS 6 DSR - CD 20 DTR - RIMODULATION IDLEMODEM BPS 33600 AT%G0MODEM FLOW OFF AT\G0MODEM MODE AUT AT\N3V.23 OPR. OFF AT%F0AUTO ANS. ON ATS0=1SERIAL BPS 115200 AT%U1BPS ADJUST OFF AT\J0SPT BPS ADJ. 0 AT\W0ANSWER MESSGS OFF ATQ2SERIAL FLOW BHW AT\Q3PASS XON/XOFF OFF AT\X0PARITY 8N ATBREAK 5 AT\K5EXIT CHAR 043 ATS2=43ANS DUMB MODE ON AT#E1CMD ECHO ON ATE1RESULTS OFF ATQ2RESULT TYPE MNPX ATV1\V2CONNECT MSG MDM ATW2CONN MNP- 0 AT-M0SPEED MATCH 1 AT%L1EQUALIZER 1 AT:E1FALLBACK 2 AT-Q2DATA ECHO OFF AT\E0INACT TIMER 00 AT\T0AUTO RETRAIN ON AT%E1COMPRESSION ALL AT%C3MAX BLK SIZE 256 AT\A3AUTO BUFF 0 AT\C0AUTO CHAR 000 AT%A0EMULATING HP OFF AT\H0PAUSE TIME 002 ATS8=2DTR 3 AT&D3MABP ADDRESS 001 AT^P1CARR DET 1 AT&C1DSR 0 AT\D0RING IND 1 AT\R1SPKR CTRL 1 ATM1SPKR VOL 2 ATL2LNG SPC DISC OFF ATY0DISC DELAY 000 AT%D0RDLB ENABLE OFF AT&T5DIAL MODE 4 ATX4PULSE DIAL 60% AT&P0PULSE MODE N AT%W0V23 HD EQU ON AT%O1GUARD TONE 0 AT&G0DATA CALL TONE OFF AT-C02ND FC OFF AT-F0NM BIT VALUE 0 AT-E0PAR CHK 0 AT-P0MANUAL DIAL 0 AT:D0UPSHIFT BPS OFF AT*H0CELLULAR OFF AT)M0LINETYPE 000 AT@M0DETECT PHASE ON AT-J1MNP EXT SVC 1 AT-K1UNIV V.23 1 AT-V1CONNECT MSG 1ST AT@C0DUMB MODE OFF AT-H0BELL ON ATB1CALL ABT DISAB OFF AT-Y0REVERSE ANS OFF AT-W0MIN CONN SPD 300 AT@UOK
Note The 00B MABP port address is a variable from 1 to 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.
Related Commands
0 to 90 minutes
Defaults
\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 61 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.
Defaults
\V2
Connection Result Code Tables
Analog modem network modules can display these result codes when they attempt to establish connection. The tables use the abbreviations: rel (reliable) and non-rel (non reliable).
Table 62 through Table 65 show the short and long form result codes, excluding connection result codes whose form depends on the \V, W, and -M commands.
•Long Form Connect Result Codes (DTE) (Table 63)
•Short Form (Numeric) Connect Result Codes (DTE Speed) (Table 64)
•Short Form (Numeric) Connect Result Codes (Modulation) (Table 65)
Table 62 Result Codes
Short Form Long Form0
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 63 Long Form Connect Result Codes (DTE)
ATV1M0W0 or ATV1M0W1
Report DTE speed DTE Speed nonrel \V rel \V1 rel, \V2 rel 175
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 is displayed in 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 EC2 In nonreliable V.21 or Bell 103 connections, the message is displayed as CONNECT.
Table 65 Short Form (Numeric) Connect Result Codes (Modulation)
ATV0W2
Report Modulation Speed Speed \V0\V1 nonrel\V2 nonrel\V4 nonrel\V5 nonrel \V1 rel\V2 rel \V3 \V4 rel\V5 rel NoncompressionV.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.32bis
14400
341
35
13
35
87
V.34
16800
60
61
13
61
88
V.34
19200
36
37
14
37
89
V.34
21600
62
63
13
63
90
V.34
24000
64
65
13
65
91
V.34
26400
66
67
13
67
92
V.34
28800
68
69
13
69
93
V.34
31200
70
71
13
94
94
V.34
33600
72
73
13
95
95
1 When \V0 is set, the following numeric codes are displayed: 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 66 lists command options.
Defaults
\W0
Table 66 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 that are sent to the serial port from the local device to the remote device. Table 67 lists command options.
Defaults
\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 do 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.
# Character Command Set
This section describes modem command that begins with the pound (#) character.
#En (Answer Mode Escape Sequence)
Determines detection of the escape sequence (+++) when the modem is in answer mode.
Defaults
#E1
Table 68 Answer Mode Escape Sequence Command Options
Command Meaning#E0
Enables escape code sequence in answer mode.
#E1
Disables 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 several functions. This section describes commands to display and change register values. Wherever possible, use the following commands only to display register contents. Use the AT command set to change register values.
Read All Registers
The %Rn command displays the contents of a register set 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 the 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)
Register S0 specifies the number of rings before the modem answers. Set register S0 to 0 to disable autoanswer. Ring signals are ignored for 5 sec after disconnect.
Related Commands
0 to 255 rings
Defaults
1 ring
S1 (Ring Counter)
Counts the rings before the modem answers a call. If there is no ring within 8 sec of the last ring, S1 is reset to 0. Ring signals are ignored for 5 sec 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 0 disables the escape code character. Register S12 sets the guard time that must be present before and after the escape code character.
Related Commands
0 to 255 (ASCII decimal)
Defaults
43 (+)
S3 (Carriage Return Character)
Specifies the carriage return (CR) character. The carriage return terminates command lines and result codes.
Related Commands
0 to 127 (ASCII decimal)
Defaults
13 (Carriage Return)
S4 (Line Feed Character)
Specifies the line feed (LF) character. The line feed character follows a carriage return at the end of command lines and result codes.
Related Commands
0 to 127 (ASCII decimal)
Defaults
10 (line feed)
S5 (Backspace Character)
Specifies the backspace (BS) character.
Related Commands
0 to 32 (ASCII decimal)
Defaults
8 (Backspace)
S6 (Wait Before Dialing)
Specifies the time the modem waits after transitioning off-hook before dialing. This is a minimum of 2 sec, 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.
Related Commands
3 to 255 sec (Japan)
2 to 255 sec (elsewhere9crdDefaults
3 sec (Japan)
2 sec (elsewhere)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
Related Commands
5 to 50 sec (Japan)
0 to 255 sec (elsewhere)Defaults
50 sec (Japan)
60 sec (elsewhere)S8 (Pause Time for Dial Delay)
Specifies the time the modem waits when the pause dial modifier (,) is used in a dial string.
Related Commands
0 to 255 sec
Defaults
0
S9 (Carrier Detect Response Time)
Specifies the time, in 0.1-sec increments, that a signal must be present before the modem recognizes it as carrier. Register S9 is used only in normal and direct modes.
Related Commands
0 to 255
Defaults
6 (0.6 sec)
S10 (Delay for Hangup After Carrier Loss)
Specifies the time, in 0.1-sec increments, that 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 5 sec before going off-hook in originate mode.
Note Register S10 is ignored in V.34, V.32, V.32bis, V.22, and V.22bis reliable connections.
Related Commands
0 to 255
Defaults
60 (6 sec)
S11 (DTMF Tone-Dialing Speed)
Specifies the time interval in milliseconds between tones when the modem is dialing over a tone line.
Related Commands
70 to 100 ms (Japan)
50 to 100 ms (elsewhere)Defaults
70 ms (Japan)
50 ms (elsewhere)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, in 0.02-sec increments. The interval between characters in the escape code or remote access attention sequence must be less than this guard time. If S12 is 0, 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.
Related Commands
0 to 255
Defaults
50 (1 sec)
S14 (Bit-Mapped Register)
Register S14 is bit-mapped for the functions listed in Table 69.
Note Pulse dialing (bit 5) is not supported in Japan.
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 70.
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 0, enter the &T0 command ) to end a test. Register S18 is not supported for V.54 loopback tests by switch or circuit.
Related Commands
0 to 255 sec
Defaults
0 (disables the timer)
S21 (Bit-Mapped Register)
Register S21 is bit-mapped for the functions listed in Table 71.
S22 (Bit-Mapped Register)
Register S22 is bit-mapped for the functions listed in Table 72.
S23 (Bit-Mapped Register)
Register S23 is bit-mapped for the functions listed in Table 73.
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, measured in 0.01-sec increments for Delay to DTR, 1-sec increments for asynchronous mode.
Related Commands
0 to 255
Defaults
5 (0.05 sec for Delay to DTR, 5 sec for asynchronous mode)
S27 (Bit-Mapped Register)
Register S27 is bit-mapped for the functions listed in Table 74.
Table 74 Register S27 Functions
Bit Meaning Decimal Value0, 1
Not supported
-
2, 3, 4, 5
Not used
-
6
Answer tone at 1200 bps
0 CCITT V.22bis/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.22bis, V.22, and V.32 Modes During Multi-Protocol Answer)
Register :T0 sets the time limit, in 0.1-sec increments, for the modem to establish a V.32, V.22bis, 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.22bis or V.22 carrier. This register setting requires 1200-bps or higher operation together with %F0%L1.
Related Commands
0 to 255
Defaults
40 (4 sec)
: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, in 0.1-sec increments. When :T3 is 0, no answer tone is sent. All V.21 and V.23 answers begin with 2 sec of silence before sending an answer tone, unless :T3 is 0.
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 0, the originating modem does not wait for an answer tone.
Related Commands
0 to 33
Defaults
33 (3.3 sec)
:T4 (Timer for Line Turnaround Delay and Carrier On)
Register :T4 specifies the minimum time, in 12.5-ms increments, 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.
Related Commands
0 to 255
Defaults
20 (250 ms)
: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 0, the modem waits 256 ms before looking for data. Register :T6 is used only in normal mode V.23 half-duplex connections.
Related Commands
0 to 255 ms
Defaults
200 ms
: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.
Related Commands
0 to 255 (decimal value of 8-bit ASCII character)
Defaults
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.
Related Commands
0 to 255 (decimal value of an 8-bit ASCII character)
Defaults
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.
Related Commands
0 to 255 (decimal value of an 8-bit ASCII character)
Defaults
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.
Related Commands
0 to 255 (decimal value of an 8-bit ASCII character)
Defaults
251 (FB hexadecimal)
:T14 (Connect Message Delay Timer)
Register :T14 specifies the time, in 100-ms increments, 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).
Related Commands
0 to 255
Defaults
0
:T16 (CTS Turn On Delay Timer)
Register :T16 specifies the time, in 12.5-ms increments, that the modem waits before raising CTS after DCD or DSR has been raised in connect mode.
Related Commands
0 to 255
Defaults
0
:T17 (V.32/V.32bis Connection Training Timer)
Register :T17 specifies the time limit for exchanging training sequences when establishing V.32 and V.32bis connections.
To reduce the time required to establish a connection (but increase modem sensitivity to noise on the line), set :T17 to a value less than 28.
To reduce modem sensitivity to noise (but lengthen the time required to make a connection), set :T17 to a value greater than 28.
Related Commands
0, 1, or 5 to 32 sec
Defaults
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 75.
:T22 (DSR Timer)
Register :T22 specifies the time, in 12.5-ms increments, 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.
Related Commands
0 to 255
Defaults
34 (425 ms)
:T23 (Bit-Mapped Register)
Register :T23 is bit-mapped for the functions listed in Table 76.
:T26 (Bit-Mapped Register)
Register :T26 is bit-mapped for the functions listed in Table 77. The default should not be changed except when configuring country codes. (See Step 3 on page 30.)
Defaults
0
:T57 (Leased-Line Timer)
Register :T57 specifies the number of seconds before the modem goes off-hook in leased-line mode when &L2 is set.
Related Commands
0 to 255
Defaults
6
:T79 (Autoretrain Attempts)
If %E1 is set, register :T79 specifies the number of autoretrain attempts before the modem disconnects.
Related Commands
0 to 3
Defaults
3
:T89 (PoS Configuration)
Register :T89 is a bit-mapped register that controls PoS configuration options. For more information, see the "PoS Support" section.
Defaults
0010 (0x2)
Table 78 Register :T89 Functions
Bit Description Meaning0
ITU or Bell mode1
0 ITU
1 Bell
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
Initial 1650-Hz Tx tone
0 2100 Hz answerback
1 1650 Hz
1 See the "Bn (ITU/Bell Mode)" section.
Notes:
•Use ITU V.21/V.22.
•Forced normal mode at 300/1200.
•Use S9 register delay before recognizing carrier.
•Use 2100-Hz answerback tones.
•Bit 1 of :T89 now defaults to 1 (:T89=2). This forces a normal mode connection at 300 bps. If this bit is off, an MNP connection is attempted.
•If this bit is on (answer modem), and the originate modem is set to \N2, no connection results.
•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 is forced for a V.23 connection. :T89 has no effect in this case.
:T120 (Answerback Tone Duration)
Register :T120 is a bit-mapped register than controls 1650-Hz answerback tone duration in 100-ms increments. For more information, see the "PoS Support" section.
Defaults
11001 (0x19, 25 decimal) (2500 ms)
:T121 (Answerback Tone Configuration for PoS)
Register :T121 is a bit-mapped register that controls answerback tone configuration for PoS in 100-ms increments. For more information, see the "PoS Support" section.
Defaults
11011 (0x1B, 27 decimal) (2700 ms)
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 is an example of an @E report:
at@e1MNP Class 10 V.34 ModemMODEM HW: OEM 2W United StatesFirmware Rev x.x.x/85Bootstrap Rev y.y.yDSP C36 Part/Rev 3035 4241DSP C58 Part/Rev 3035 2041NET ADDR: FFFFFFFFFFFFConnect Time HH:MM:SS 000:02:014 RTS 5 CTS 6 DSR - CD 20 DTR - RIDisconnect Remote - Local - 14,10,9CONNECTION STATUSMod Type IDLETX/RX Spd 600 600 BPSTX/RX Spd Mask NA 0000 HexTX/RX Symbol Rate 2400 2400 HzTX/RX Carrier Frequency 1800 1800 HzTX/RX Trellis Code States 16 16TX/RX Nonlinear Encoding OFF OFFTX/RX Precoding OFF OFFTX/RX Shaping OFF OFFTX Preemphasis Index 0TX Lvl Reduction 0 dBSecondary Channel OFFLINE IMPAIRMENTSTX Lvl REG - 10 dBmTX Lvl RAM - 0 dBTX Lvl Reduction 0 dBTX Lvl - 10 dBmRX Lvl - 16 dBmSignal/Noise Ratio 0Signal/Distortion Ratio 0Eye Quality 0000 HexLower Band Edge 0 HzUpper Band Edge 0 HzPhase Jitter Freq 0 HzPhase Jitter Amp 0.0 degFar Echo Offset (Phase Roll) 0.0 HzFar Echo Lvl = 20log(N)-81 0 NRound Trip Delay 0 msecDropouts > 5dB 0RTRNs Initiated 0RTRNs Accepted 0Rate Changes Initiated 0Rate Changes Accepted 0FF Trip/Block Error Rate 0000 HexEQM FUNCTION STATUSAVG EQM Filter Pole 8A25 HexEQM Gain 8A4E HexEQM Offset 8A77 HexAVG EQM Filter Pole 8AA0 HexAVG EQM Baud Interval 8AC9 HexAVG EQM Sample Size 8AF2 HexAVG EQM 8B1B HexEQM Threshold Lvl 8B44 HexOKTable 79 describes components of the report. The table does not include self-explanatory fields.
PoS Support
Analog modems incorporate a series of adaptations for PoS quick connects in Europe that are defined best under two sets of modifications. The objective is to enable an immediate V.21 without answer tone for 300 bps PoS, and then train up to V.22 with answer tone for 1200 bps PoS. By default, the configuration is locked to 8 bit data, no parity, 1 start, 1 stop bit, and normal mode connections.
Registers :T89, :T120, and :T121 have been allocated to enable 300/1200 quick connections, error correction, pause for DCD to be true, and tone duration timers.
An incoming call is answered and the answer modem sends out 1650 Hz immediately. The PoS device can send back 980 Hz if configured to do so. Note bit 3 of :T89 in the ":T89 (PoS Configuration)" section.
The answer modem detects the data carrier—in this case within 5 ms—at which time the PoS device initiates the transaction request. If the calling device is not a quick connect V.21 device, then the 1650 Hz timer expires (duration of 1650 Hz declared in :T120) and the answer modem then trains up for 1200 bps and sends out 2100 Hz answerback tones (duration of answerback tones declared in :T121). The standard answerback period of 3 sec (+/- 20 percent ) is modifiable by :T121.
PoS Field Applications
The PoS feature is deployed with two main types of PoS devices. One device is a low-speed, instant connect V.21 terminal, which dictates that the modems train up, not down, as would typically be the case with central site modems.
The actual initialization string for a European client might be exactly as described in the following example. Note that the string includes the country code specific profile.
Caution You cannot apply a country code -IxZ command in the PoS modemcap. The PoS features are either ignored or removed with the associated country reset. The specialized PoS train up and quick-connect features are ITU (V.21/V.22) specific. This dictates that you remove any country code modemcap and apply any country-specific requirements as part of your PoS modemcap.
Example of Modemcap Creation, Assignment, and Audit
Enter router configuration mode and create a global modemcap as follows:
Router# configure terminalEnter configuration commands, one per line. End with CNTL/Z.Router(config) #modemcap edit your_config factory &f&d0%d2@c0b0%m0\n0Router(config) #modemcap edit your_config misc%u0%g1%b1200%u1:t89=14:t121=015:t51=14Router(config) #line 11Router(config-line) #mod auto type your_config
Router(config-line) #exitRouter(config) #exit
Note For 300/1200 Bell devices, :T89 and associated registers have no effect.
Use the debug command debug confmodem to audit the modem profile:
Router# deb confmodemModem Configuration Database debugging is onRouter #cle li 11[confirm][OK]Router# Dec 11 15:58:20 PST: TTY11: Line reset by "Exec"Dec 11 15:58:20 PST: TTY11: Modem: IDLE->HANGUPDec 11 15:58:20 PST: TTY11: dropping DTR, hanging upDec 11 15:58:20 PST: tty11: Modem: HANGUP->IDLEDec 11 15:58:25 PST: TTY11: restoring DTRDec 11 15:58:26 PST: TTY11: autoconfigure probe startedDec 11 15:58:26 PST: TTY11: Modem command:--AT&f&d0%d2@c0b0%m0\n0%u0%g1%b1200%u1:t89=14:t121=015:t51=14--Obtaining Documentation
Cisco provides several ways to obtain documentation, technical assistance, and other technical resources. These sections explain how to obtain technical information from Cisco Systems.
Cisco.com
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Obtaining Technical Assistance
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Technical Assistance Center
The Cisco TAC is available to all customers who need technical assistance with a Cisco product, technology, or solution. Two levels of support are available: the Cisco TAC website and the Cisco TAC Escalation Center. The avenue of support that you choose depends on the priority of the problem and the conditions stated in service contracts, when applicable.
We categorize Cisco TAC inquiries according to urgency:
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•Priority level 3 (P3)—Your network performance is degraded. Network functionality is noticeably impaired, but most business operations continue.
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•Priority level 1 (P1)—Your production network is down, and a critical impact to business operations will occur if service is not restored quickly. No workaround is available.
Cisco TAC Website
You can use the Cisco TAC website to resolve P3 and P4 issues yourself, saving both cost and time. The site provides around-the-clock access to online tools, knowledge bases, and software. To access the Cisco TAC website, go to this URL:
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If you have Internet access, we recommend that you open P3 and P4 cases through the Cisco TAC website so that you can describe the situation in your own words and attach any necessary files.
Cisco TAC Escalation Center
The Cisco TAC Escalation Center addresses priority level 1 or priority level 2 issues. These classifications are assigned when severe network degradation significantly impacts business operations. When you contact the TAC Escalation Center with a P1 or P2 problem, a Cisco TAC engineer automatically opens a case.
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Before calling, please check with your network operations center to determine the level of Cisco support services to which your company is entitled: for example, SMARTnet, SMARTnet Onsite, or Network Supported Accounts (NSA). When you call the center, please have available your service agreement number and your product serial number.
Obtaining Additional Publications and Information
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•The Cisco Product Catalog describes the networking products offered by Cisco Systems as well as ordering and customer support services. Access the Cisco Product Catalog at this URL:
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•Cisco Press publishes a wide range of networking publications. Cisco suggests these titles for new and experienced users: Internetworking Terms and Acronyms Dictionary, Internetworking Technology Handbook, Internetworking Troubleshooting Guide, and the Internetworking Design Guide. For current Cisco Press titles and other information, go to Cisco Press online at this URL:
•Packet magazine is the Cisco monthly periodical that provides industry professionals with the latest information about the field of networking. You can access Packet magazine at this URL:
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•iQ Magazine is the Cisco monthly periodical that provides business leaders and decision makers with the latest information about the networking industry. You can access iQ Magazine at this URL:
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•Internet Protocol Journal is a quarterly journal published by Cisco Systems for engineering professionals involved in the design, development, and operation of public and private internets and intranets. You can access the Internet Protocol Journal at this URL:
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•Training—Cisco offers world-class networking training, with current offerings in network training listed at this URL:
http://www.cisco.com/en/US/learning/le31/learning_recommended_training_list.html
•AT Command Set and Register Summary for V.90 WIC-1AM and WIC-2AM Analog Modem WAN Interface Cards—Describes the host command and responses for the NM-8AM-V2, NM-16AM-V2, WIC-1AM, and WIC-2AM Analog Modem Network Modules. You can access the document at this URL:
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