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AT Command Set and Register Summary for MICA Six-Port Modules with PIAFS

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AT Command Set and Register Summary for MICA Six-Port Modules with PIAFS

Table Of Contents

AT Command Set and Register Summary for MICA Six-Port Modules with PIAFS

Entering AT Commands

PIAFS Call Initiation

Setting Up NEC Aterm Terminal Adapters

Aterm IW60

Aterm IW50

Aterm IT75

Command Summary for Aterm Devices

Setting Up the NTT-ME MN128 Terminal Adaptor

Command Summary for NTT-ME MN128 Devices

Setting Up the Furukawa Mucho-E Terminal Adaptor

Command Summary for Furukawa Mucho-E Devices

Alphabetic Command Set

A/ (Repeat Last Command)

A (Answer)

AT (Attention)

D {dial string} (Dial)

DEBUGTHISMODEM (Debug This Modem)

DI {dial string} (ISDN Dial)

En (Command Echo)

H (Hang Up)

In (Inquiry)

Ln (Monitor Speaker Loudness)

Mn (Monitor Speaker Mode)

O (Online from Escape Mode)

P (Pulse Dial)

Qn (Quiet)

Sn (Point to a New Configuration Register)

Sn? (Read Configuration Register)

Sn=y (Set Configuration Register to a Decimal Value)
Sn=>y (Set Configuration Register to a Hexadecimal Value)

T (Tone Dial)

Vn (Result Code Format)

Xn (Extended Result Codes)

Z (Reset)

Percent Command Set

%R (Verbose Display of the Modem Configuration)

Ampersand Command Set

&Cn (Serial Port DCD Control)

&Dn (DTR Control)

&F (Restore Factory Defaults)

&Tn (Diagnostic Test Mode)

+F Command Set

Backslash Command Set

\B (Transmit a Break)

\D{command} {modem} (DSP Debug Options)

\Qn (Flow Control)

\S (Verbose Display of Current Modem Statistics)

Modem S Register Summary

S Register Commands

Read All Registers

Read a Configuration Register

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

Bit-Mapped Registers

S Register Descriptions

S0 (Automatic Answer in Seconds)

S1 (Unused)

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 Comma Dial Modifier)

S9 (Modem Settings)

S10 (Delay for Hang-up After Carrier Loss)

S11 (Link Initiate Action)

S12 (Number of Async Data Bits)

S13 (Parity Configuration)

S14 (Stop Bit Configuration)

S15 (V.42 Detect Phase Operation)

S16 (Error Correction Autodetect Timeout)

S17 (Error Correction Negotiation Timeout)

S18 (Error Correction Fallback Character)

S19 (Error Correction Retransmission Limit)

S20 (Error Correction Max Frame Length)

S21 (Data Compression)

S22 (ARA Error Correction Options)

S23 (V.42 LAP-M Error Correction)

S24 (MNP Error Correction)

S25 (Link Protocol Fallback)

S26 (DSP Processor MVIP TDM Slice)

S27 (Calling Tone)

S28 (Guard Tone)

S29 (Modulation Standard)

Digital and Analog Modulations

Effect of FSK on Framing

S30 (Maximum Connect Rate)

S31 (Minimum Connect Rate)

S32 (Signal Quality Threshold)

S33 (Speed Change Squelch Timer)

S34 (Fall-forward Timer)

S35 (Fallback Timer)

S36 (Terminate Timeout)

S37 (Wait for Carrier After Dial)

S38 (Delay for Hang-up After Carrier Loss)

S39 (Transmit Level Setting)

S40 (Consecutive Retrain Disconnect Threshold)

S41 (V.34 Maximum Symbol Rate)

S42 (V.34 Minimum Symbol Rate)

S43 (V.34 Carrier Frequency)

S44 (V.34 Preemphasis Filter Selection)

S45 (Signaling Type)

S46 (Call Progress Tone Detection)

S47 (Hayes +++ Escape Detection)

S48 (AT Command Processor)

S49 (Call Setup Delay)

S50 (Maximum PCM Connect Rate)

S51 (Minimum PCM Connect Rate)

S52 (Digital Pad Compensation)

S52 (Digital Pad Compensation)

S53 (V.8bis Capability)

S54 (General Options)

S55 (SS7/COT Control)

S56 (Set Maximum V.34+ Transmit Rate)

S57 (V.110 and PIAFS User Rate)

S58 (V.110 Flow Control and Clock bits)

S59 (Unused)

S60 (Sticky Flags)

S61 (Unused)

Cisco Connection Online


AT Command Set and Register Summary for MICA Six-Port Modules with PIAFS


March 1, 2002

This document describes modem AT commands and S registers for Cisco MICA six-port modules for PIAFS devices. (PIAFS stands for PHS (Personal Handyphone System) Internet Access Forum Standard.) All commands and S registers described are in MICA Portware Release 8.2.


Note This version of MICA Portware is for use only in Japan, and only with a PIAFS-capable router or access server running Cisco IOS Release 12.1(2)XD or 12.1(3)T.


AT commands are modem commands that are prefixed with the characters AT. (MICA stands for modem ISDN channel aggregation, the Cisco high-density modem technology.)

For information about managing modems on Cisco access servers using Cisco IOS commands, refer to the software configuration guide for the access server in which the modems are installed.


Note The defaults and limits on parameters described in this document are valid for the United States. They may not be appropriate for use in other countries.


If you have questions or need help, refer to the section "Cisco Connection Online" on page 54 .

This document contains the following sections:

Entering AT Commands

PIAFS Call Initiation

Alphabetic Command Set

Percent Command Set

Ampersand Command Set

+F Command Set

Backslash Command Set

Modem S Register Summary

S Register Descriptions

Cisco Connection Online

Entering AT Commands

To send AT commands to the modem, you must first put the modem in AT command mode. Entering AT command mode involves a reverse Telnet procedure. shows how to enter AT command mode from Cisco IOS EXEC mode using reverse Telnet.


Note MICA does not support the modem at-mode commands used in Cisco IOS line configuration mode. Therefore, you cannot issue AT commands to MICA modems from the Cisco IOS command line


.

Table 1 Steps for Entering and Exiting AT Command Mode 

Step
Command
Purpose
1

telnet ip-address line#







Trying 172.0.0.1, 2001 ... Open

Open a reverse Telnet connection to the modem. In this example, ip-address is the IP address of the access server and line# is the two-digit line number of the modem, prefixed by 20. (For example, enter telnet 172.0.0.1 2001 if the IP address is 172.0.0.1 and the modem line number is 1.) If you do not know which line number to use, enter the show line command and check the resulting display for tty numbers that have inout in the Modem column. Use one of those numbers.

The Telnet connection is open when the word Open appears.

2

at

OK

There is no command prompt in AT command mode. To confirm that you can enter AT commands, type at and press Return. If you are in AT command mode, the modem returns OK.

3

Ctrl-Shift-6 X



# disconnect

When you have finished entering AT commands, exit AT command mode and return to privileged EXEC mode. To do so, type Ctrl-Sh-6 X (that is, hold down the Control and Shift keys and press 6, and then release everything and press X).

Enter disconnect to end the Telnet connection.


Use these guidelines when you send AT commands to a modem:

Enter the AT prefix before all commands except A/ (Repeat Last Command) and +++ (Escape code). Commands are executed when you press Return or Enter.

Command lines are limited to 128 characters, not including the AT prefix and Return characters. Dial strings, however, are limited to 49 characters.

You can enter several commands on the same command line, as long as you do not exceed the 128-character limit (see preceding item). Enter commands with no spaces or separators between them. The commands are executed in the order in which they appear on the command line. If an individual command fails (returns ERROR), any subsequent commands on that line are not executed.

Certain commands work only if they are the last command on the line. Such commands include A (answer), D (dial), H (hang up), Z (reset), and any command that takes time to execute or that does not return a result immediately.

Spaces within AT commands are permitted anywhere except between the A and the T. For example, enter ATS0?, AT S0?, ATS 0?, but not A TS0?.

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

Type Ctrl-C (^C) to abort a partially entered command. The modem echoes ^C.

Use the Backspace key (or another key specified in register S5) to erase characters on the command line, except for the leading characters AT. To clear the characters AT, press Return for a fresh command line. For information on changing the command-line erase key, see "S5 (Backspace Character)" on page 29 .

A missing numeric argument is assumed to be zero. For example, the Quiet command Q is equivalent to Q0.

The modem operates in the following modes:

Command state: The modem is idle and waiting for commands.

Set-up state: Establishing a connection.

Online state: Connected to another modem. To return to the online state from any other state, enter ATO and press Return. You will see a fresh connect message.

Escape state: Allows you to enter commands while the modem is on line. To go to escape state, enter +++ (+++ is the default escape code; see "S2 (Escape Code Character)," on page 28 for details on changing the escape code). When you enter the +++ command, pause for at least a second before and after typing it, but do not pause between characters. Do not press Return. Wait for the OK prompt before entering commands.

The escape code can be enabled and disabled; for instructions, see "S2 (Escape Code Character)," on page 28, and "S47 (Hayes +++ Escape Detection)" on page 47 .

PIAFS Call Initiation

This section tells you how to set up terminal adaptors for PIAFS. Instructions are provided for terminal adaptors from three manufacturers: NEC, NTT-ME, and Furukawa.

Setting Up NEC Aterm Terminal Adapters

Use the commands listed here to set up the following NEC terminal adapter models:

Aterm IW60

Aterm IW50

Aterm IT75


Note The NEC Aterm series devices can support V.42bis compression only at a PIAFS user rate of 32k. (Use register S57 to set the PIAFS user rate; see the "S57 (V.110 and PIAFS User Rate)" section.)


Aterm IW60

In the commands below, replace dial string with the telephone number to be dialed.

Parameters
Terminal Adaptor Set-Up Commands

User rate 32K, V.42bis enabled

AT%C2$N1=2dtdialstring

User rate 32K, V.42bis disabled

AT%C0$N1=2dtdialstring


Aterm IW50

In the commands below, replace dial string with the telephone number to be dialed.

Parameters
Terminal Adaptor Set-Up Commands

User rate 32K, V.42bis enabled

AT%C2$N1=2$N15=0dtdialstring

User rate 32K, V.42bis disabled

AT%C0$N1=2$N15=0dtdialstring

User rate 64K, V.42bis disabled

AT$N1=2$N15=1dtdialstring


Aterm IT75

In the commands below, replace dial string with the telephone number to be dialed.

Parameters
Terminal Adaptor Set-Up Commands

User rate 32K, V.42bis enabled

AT%C2$N1=2$N15=0dtdialstring

User rate 32K, V.42bis disabled

AT%C0$N1=2$N15=0dtdialstring

User rate 64K, V.42bis disabled

AT$N1=2$N15=1dtdialstring


Command Summary for Aterm Devices

This is a brief description of the commands used with the Aterm terminal adaptors.

Command
Description

%Cn

Enable or disable V.42bis compression.

n = 0 Disable compression

n = 2 Enable V.42bis compression (Default value)

$N1=n

Setting of data port

n = 0 Disable async/sync PPP translation (Default value)

n = 1 Enable async/sync PPP translation

$N15=n

Setting of PIAFS speed

n = 0 PIAFS 32K (Default value)

n = 1 PIAFS 64K

dtdialstring

Dial the specified dial string.


Setting Up the NTT-ME MN128 Terminal Adaptor

Use the commands listed here to set up the NTT-ME terminal adapter model MN128.


Note The MN128 does not support V.42bis compression at any speed.


In the commands below, replace dial string with the telephone number to be dialed.

Parameters
Terminal Adaptor Set-Up Commands

User rate 32K, V.42bis disabled

ATx3&q7S120=1dtdial string $B


Note Set DTE speed to 57600.

User rate 64K, V.42bis disabled

AT!b1x3&q7S122=1dtdial string $B


Note Set DTE speed to 115200.


Command Summary for NTT-ME MN128 Devices

This is a brief description of the commands used with the NTT-ME MN128 terminal adaptor.

Command
Description
Comment

!bn

Set calling number notification.

n = 0 Disable notification

n = 1 Notify contracted number

n = 2 Notify dial-in number

n = 3 Notification depends on contract with NTT

n = 4 Disable notification

 

Xn

Set result code mode. (See MN128 documentation.)

n = 0 Basic result codes

n = 1 Extended result code1

n = 2 Extended result code2

n = 3 Extended result code3

 

&Qn

Set communication mode.

n = 0 V.110 mode

n = 2 V.110/DTR mode

n = 3 HDLC mode

n = 4 HDLC/DTR mode

n = 5 HDLC (PPP, ARA) mode

n = 6 HDLC (PPP, ARA)/DTR mode

n = 7 V.110/HDLC (PPP, ARA) automode

Communication mode depends on DTE speed:

Use V.110 for DTE speeds of 9600, 19200, 38400

Use HDLC for DTE speeds of 56000, 128000

Use PIAFS or Bearer (depending on S registers S120 and S121) for DTE speeds of 32000

Use PIAFS or HDLC (depending on S register S122) for DTE speeds of 64000

S120=n

Set 32K speed initiating call.

n = 0 Bearer

n = 1 PIAFS call initiation

n = 2 Try PIAFS first, then try bearer.

 

S122=n

Set 64K speed initiating call.

n = 0 HDLC

n = 1 PIAFS 64K

 

dtdialstring

Dial the specified dial string.

 

Setting Up the Furukawa Mucho-E Terminal Adaptor

Use the commands listed here to set up the Furukawa Mucho-E terminal adaptor.

Note The Mucho-E does not support V.42bis compression at any speed.

In the commands below, replace dial string with the telephone number to be dialed.

Parameters
Terminal Adaptor Set-Up Commands

User rate 32K, V.42bis disabled

ATX1G1=5ddialstring

User rate 64K, V.42bis disabled

ATX1G1=6ddialstring


Command Summary for Furukawa Mucho-E Devices

This is a brief description of the commands used with the Mucho-E terminal adaptor

.

Command
Description

Xn

Set result codes.

n = 0 Do not display communication speed

n = 1 Display communication speed

G1=n

Set communication mode.

n = 2 64kbps sync/async PPP mode

n = 5 32kbps PIAFS mode

n = 6 64kbps PIAFS mode

ddialstring

Dial the specified dial string.


Alphabetic Command Set

This section describes MICA modem commands that begin with alphabetic characters (A to Z).

A/ (Repeat Last Command)

Re-executes the last command one time. If there is no previous command, the modem displays OK. Do not enter the AT prefix before A/. Usually, you need not enter Return after A/.


Note Because of the data forwarding method used in some Telnet connections, it may be necessary to press Return after A/ in some cases.


A (Answer)

Forces the modem off-hook in answer mode, regardless of the value of register S11. The modem must be in the command state when you use the Answer command. If the modem is not in the command state, it responds to this command with a result code of ERROR.

AT (Attention)

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

D {dial string} (Dial)


Note In PIAFS releases, use the command ATDI instead of ATD. See the "DI {dial string} (ISDN Dial)" section.


Dials a telephone number, establishing a connection. Always make the Dial command the last (or the only) command on the command line. The dial string can contain up to 49 characters; valid characters are the digits 0 to 9, and for tone dialing, the letters A, B, C, and D, and the characters # and *. The modem ignores invalid characters. If you enter dial strings longer than 49 characters, the result code ERROR appears. The following example shows the command used to dial the telephone number 1 (617) 555-1234:

D 1 (617) 555-1234

The spaces, parentheses, and hyphen in the example's dial string are ignored: they are not dialed and they do not count against the 49-character limit.

To cancel the Dial command, press any key, or clear the call from the router or access server.

The modem must be in the command state when you use the Dial command. If the modem is in the escape state, it responds to this command with a result code of ERROR.

For compatibility, the modem accepts these dial modifiers but does not act on them:

P

T

W

, (comma)

@ (at sign)

! (exclamation point)

; (semicolon)

DEBUGTHISMODEM (Debug This Modem)

Enables debugging features, which include the following:


DI {dial string} (ISDN Dial)

Places an ISDN call, establishing a connection. In order to use the DI command, you must set register S29 to a compatible call type. The call type for ISDN is V.110 (S29 = 8). See "S29 (Modulation Standard)," on page 38.

The ISDN Dial command must be the last command on the command line. The dial string can contain up to 49 characters; valid characters are the digits 0 to 9, and for tone dialing, the letters A, B, C, and D and # and *. The modem ignores invalid characters; dial strings longer than 49 characters return the result code ERROR. The following example shows the command used to dial the telephone number 1 (617) 555-1234

DI 1 (617) 555-1234

The spaces, parentheses, and hyphen in the example's dial string are ignored: they are not dialed and they do not count against the 49-character limit.

To cancel the ISDN Dial command, press any key, or clear the call from the router or access server.

The modem must be in the command state when you use the ISDN Dial command. If the modem is in the escape state, it responds to this command with a result code of ERROR.

For compatibility, the modem accepts these dial modifiers but does not act on them:

P

T

W

, (comma)

@ (at sign)

! (exclamation point)

; (semicolon)

En (Command Echo)

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

Default

E1

Table 2 Command Echo Options

Command Option
Meaning

E0

Disables echoing of commands to the workstation

E1

Enables echoing of commands to the workstation


H (Hang Up)

Disconnects this modem from the remote system and hangs up the telephone line.

In (Inquiry)

Displays modem information and results of checksum tests on firmware. lists inquiry command options.

Table 3 Inquiry Command Options

Command Option
Meaning

I0

Displays the modem product ID code

I1

Runs a checksum on firmware and displays the result

I2

Runs a checksum on firmware and displays the checksum status:

0 (OK in verbose mode) if the checksum is correct

1 (ERROR in verbose mode) if the checksum is not correct

I3

Displays the country code, modulation standards, and revision levels, as shown in this example:

ATI3


Cisco MICA Hex Modem Module Product Information


Country Code 001

V.90, K56FLEX 1.1, V.34+, V.32terbo, V.22bis, V.42, MNP2-4, V.42bis, MNP5, Fax, V.110

HEX modem index 00

CP code revision 2.7.0.7

CP revision date Apr 16 1999

SP code revision 2.7.0.7

SP revision date 04/16/1999 (MM/DD/YYYY)

V.34+, V.32terbo, V.22bis, V.42, MNP2-4, V.42bis, MNP5, K56Flex11, SS7_COT, TRACE, FAXõM_

OK

I4

Displays one of the following lines describing the features available in the version of Portware running on the modem:

Cisco MICA V34+


Cisco MICA K56FLEX


Cisco MICA K56FLEX/FAX


Cisco MICA V.90/K56FLEX


Cisco MICA V.90/K56FLEX/FAX


Ln (Monitor Speaker Loudness)

This command is provided for compatibility; it has no effect. (The modem responds OK but takes no action.) However, the value of n must be in the range 0 to 3; if you enter a different value, the modem displays an ERROR result code.

Mn (Monitor Speaker Mode)

This command is provided for compatibility; it has no effect. (The modem responds OK but takes no action.) However, the value of n must be in the range 0 to 2; if another value is used, the modem returns an ERROR result code.

O (Online from Escape Mode)

Changes the modem to the online state (connected, or steady state) from escape mode. The modem displays a connect message.

P (Pulse Dial)

This command is provided for compatibility; it has no effect. (The modem responds OK but takes no action.)

Qn (Quiet)

Configures the modem to send (or not send) result and status codes, such as OK, ERROR, and BUSY, to your workstation. lists quiet mode command options.


Note The Q command does not affect output from AT commands such as I, Sn?, \S, and %R.


Default

Q0

Table 4 Quiet Mode Command Options

Command Option
Meaning

Q0

Enables output of result codes

Q1

Disables output of result codes

Q2

Enables output of result codes only when the modem is originating calls


Sn (Point to a New Configuration Register)

Sets the modem register pointer to S register n (where n is a decimal number). Register n becomes the current register and is addressed by subsequent register commands. If you enter a value for n that is outside the range of S register numbers, the command fails (returns ERROR). For descriptions of the S registers and a summary of commands you can use to manipulate S registers, see "Modem S Register Summary" on page 26 . See also "%R (Verbose Display of the Modem Configuration)" on page 15 .

Range

0 to 60. (The range is determined by the numbers of the S registers, which can change from one MICA Portware release to the next as new S registers are added.)

Default

S0

Sn? (Read Configuration Register)

Displays the contents of S register n (where n is a decimal number). For descriptions of the S registers, see "Modem S Register Summary" on page 26 . See also "%R (Verbose Display of the Modem Configuration)" on page 15 .

Range

0 to 60

Default

S0

Sn=y (Set Configuration Register to a Decimal Value)
Sn=>y (Set Configuration Register to a Hexadecimal Value)

Sets the contents of S register n (where n is a decimal number) to the value y. Some invalid values for y cause the command to fail (returning ERROR), even though other invalid values are accepted. For descriptions of the S registers, see "Modem S Register Summary" on page 26 .

Range

n: 0 to 60
y: depends on n, the register selected

T (Tone Dial)

This command is provided for compatibility; it has no effect. (The modem responds OK but takes no action.)

Vn (Result Code Format)

Selects the format (short or long) of the result codes sent to your workstation. describes the result codes. lists options for the result code format command.


Note The V command does not affect output from AT commands such as I, Sn?, \S, and %R.


Table 5 Result Codes

Numeric Result Code
Long Result Code
Description

0

OK

Command accepted, ready for next command.

1

CONNECT

A connection has been established. The long result code may be followed on the same line by speed and protocol information, depending on the setting of the X command. See "Xn (Extended Result Codes)" in the next section.

2

RING

Ring signal indicated.

3

NO CARRIER

Indicates one of the following:

Carrier signal was not detected.

Carrier signal was lost for the period specified in register S10.

The other modem indicated disconnection (with error correction only).

An unrecoverable error occurred (with error correction only).

4

ERROR

Indicates one of the following:

Invalid command or checksum.

Command line exceeds 128 characters.

Dial string exceeds 49 characters.

5

Not used.

6

NO DIALTONE

Dial tone was not detected, or in channelized T1 there was no trunk to seize.

7

BUSY

Busy (line engaged) signal or number unobtainable signal detected.)

8

NO ANSWER

There was no answer-back tone. (Either the call was not answered, or a human being answered.)

9

(ABORTED)

An operator pressed any key to abort a D (Dial) or A (Answer) command.


Default

V1

Table 6 Options for Result Code Format Command

Command Option
Meaning

V0

Sends short result codes (numeric codes defined in )

V1

Sends long result codes (text codes defined in )


Xn (Extended Result Codes)

Selects the extended result code format sent to the workstation. lists options for the extended result codes command.

Before dialling, the modem waits for the time delay specified in register S6. (See "S6 (Wait Before Dialing)" on page 29 for information on register S6.)

See also the previous section, "Vn (Result Code Format)." You can use the Vn command to select short or long form result codes.

Default

X4

Table 7 Options for Extended Result Codes Command 

Command Option
Meaning

X0

Sends the CONNECT result code when a connection is established. The modem ignores dial tones and busy signals.

X1

Sends a verbose connect message1 when a connection is established. The modem ignores dial tones and busy signals.

X2

Sends a verbose connect message1 when a connection is established. The modem sends a NO DIALTONE result code if a dial tone is not detected within 5 seconds of a dial attempt. The modem ignores busy signals.

X3

Sends a verbose connect message1 when a connection is established. The modem sends a BUSY result code if a busy signal is detected. The modem ignores the dial tone.

X4

Sends a verbose connect message1 when a connection is established. The modem sends a NO DIALTONE result code if a 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.

1 The connect message for X1 through X4 includes the rate in bits per second of the connection, the protocol used, and the compression type. For example, a connect message might read "CONNECT 33600 /V.42/V.42bis". (X0 sends only the result code, CONNECT.)


Z (Reset)

Hangs up the telephone line, clears the modem, and restores the factory default settings.

Percent Command Set

This section describes the modem command that begins with a percent (%) character.

%R (Verbose Display of the Modem Configuration)

Reads and displays the modem configuration, showing the contents of modem S registers first as a list of values in hexadecimal and decimal format (the Configuration Summary), and then as a more detailed table with register settings in decimal (in the Value column) and descriptions of the registers. Press Q to stop the display. This is a sample of the output resulting from the %R command:

AT%R

Cisco MICA Hex Modem Module Configuration
 
CONFIGURATION SUMMARY

 REG =  HEX/DEC   REG =  HEX/DEC   REG =  HEX/DEC   REG =  HEX/DEC
 S00 = 0001/1     S02 = 002B/43    S03 = 000D/13    S04 = 000A/10
 S05 = 0008/8     S06 = 0002/2     S07 = 0028/40    S08 = 0002/20
 S09 = 013D/317   S10 = 000E/14    S11 = 0000/0     S12 = 0008/8
 S13 = 0000/0     S14 = 0001/1     S15 = 0001/1     S16 = 0032/50
 S17 = 0064/100   S18 = 000D/13    S19 = 000C/12    S20 = 0100/256
 S21 = 0003/3     S22 = 0001/1     S23 = 0001/1     S24 = 0001/1
 S25 = 0000/0     S26 = 0000/0     S27 = 0000/0     S28 = 0000/0
 S29 = 0009/9     S30 = 8340/33600 S31 = 012C/300   S32 = 0002/2
 S33 = 01F4/500   S34 = 03E8/1000  S35 = 0032/50    S36 = 0014/20
 S37 = 0028/40    S38 = 000E/14    S39 = 0007/7     S40 = 0004/4
 S41 = 0005/5     S42 = 0000/0     S43 = 0002/2     S44 = 000B/11
 S45 = 0000/0     S46 = 0000/0     S47 = 0002/2     S48 = 0001/1
 S49 = 0000/0     S50 = EA60/60000 S51 = 7D00/32000 S52 = 0001/1
 S53 = 0003/3     S54 = 0008/8     S55 = 0000/0     S56 = 8340/33600
 S57 = 0000/0     S58 = 0000/0     S59 = 0000/0     S60 = 0000/0    
 S61 = 0000/0

Reg  Value   Description
---  -----   -----------
S0  [    1]  Automatic Answer
S2  [   43]  Escape Code Character
S3  [   13]  Carriage Return Character
S4  [   10]  Line Feed Character
S5  [    8]  Backspace Character
S6  [    2]  Pause Before Blind Dialing (seconds)
S7  [   40]  Connect Complete Timeout (seconds)	(60 seconds for PCM builds only]
S8  [    2]  Comma Dial Modifier Time (seconds)
Strike a key when ready (Q to QUIT)

S9  [  317]  Bit-Mapped Register
               0 = Command echo
                   0 = E0 - No echo
                   1 = E1 - Echo
               1,2 = Result codes
                   0 = Q0 - Output result code
                   1 = Q1 - No result codes
                   2 = Q2 - No result codes in Answer mode
               3 = Result type
                   0 = V0 - Short form
                   1 = V1 - Long form
               4,5 = Data Terminal Ready
                   0 = &D0 - Ignore DTR
                   1 = &D1 - Modem enters command state
                   2 = &D2 - Modem goes on hook
                   3 = &D3 - Modem is reset
               6,7,8 = CONNECT Result Code & Call Progress
                          Text Busy NoDT
                   0 = X0 - N    N    N
                   1 = X1 - Y    N    N
                   2 = X2 - Y    N    Y
                   3 = X3 - Y    Y    N
                   4 = X4 - Y    Y    Y

S10 [   14]  Automatic Disconnect Delay
S11 [    0]  Link Initiate Action
               0 = Answer
               1 = Originate
S12 [    8]  Number of async data bits
              - NO PROTOCOL ASYNC MODE ONLY -
               7 = 7 data bits
               8 = 8 data bits
S13 [    0]  Parity Configuration
              - NO PROTOCOL ASYNC MODE ONLY -
               0 = No parity
               1 = Even parity
               2 = Odd parity
               3 = Space parity
               4 = Mark parity
Strike a key when ready (Q to QUIT)

S14 [    1]  Stop Bit Configuration
              - NO PROTOCOL ASYNC MODE ONLY -
               1 = 1 stop bit   2 = 2 stop bits
S15 [    1]  V.42 detect phase
               0 = Disabled   1 = Enabled
S16 [   50]  EC Autodetect Time-out (100 msec)
S17 [  100]  EC Negotiate Time-out (100 msec)
S18 [   13]  EC Fallback Character
S19 [   12]  EC Retransmission Limit
S20 [  256]  EC max packet length (64..1024)
               max window = 8192/<length>

S21 [    3]  Data Compression
               0 = Disabled
               1 = V.42bis
               2 = MNP5
               3 = MNP5 or V.42bis
S22 [    0]  ARA Error Correction
               0 = Disabled
               1 = Answer any ARA, don't originate
               2 = Originate ARA1.0, answer any
               3 = Originate ARA2.0, answer any
S23 [    1]  V.42 (LAPM) Error Correction
               0 = Disabled   1 = Enabled
S24 [    1]  MNP (2-4) Error Correction
               0 = Disabled   1 = Enabled
Strike a key when ready (Q to QUIT)

S25 [    0]  Fallback Link Protocol
               0 = Async data mode
               1 = Sync data mode
               2 = Hangup
S26 [    0]  MVIP Timeslice
S27 [    0]  Calling Tone
               0 = Disabled   1 = Enabled
S28 [    0]  Guard Tone
               0 = Disabled   1 = Enabled
S29 [    9]  Modulation Standards
               0 = V.34+ Automode, with terbo
               1 = V.34+ Automode, no terbo
               2 = V.32 terbo Automode
               3 = V.32bis Automode
               4 = V.22bis Automode
               5 = K56FLEX 1.1 Automode
               6 = V.90 Automode
               7 = SS7
               8 = V.110 Automode
               9 = PIAFS

S30 [33600]  Maximum Connect Rate
               (75 to 33600 bps, >=Min)
S31 [  300]  Minimum Connect Rate
               (75 to 33600 bps, <=Max)
S32 [    2]  Signal Quality Threshold
               0 = No action on bit errors
               1 = Bers >= 1:100
               2 = Bers >= 1:1000
               3 = Bers >= 1:10000
               4 = Bers >= 1:100000
               5 = Bers >= 1:1000000
S33 [  500]  Speed change squelch time (1 msec)
S34 [ 1000]  Fall-forward timer (10 msec)
S35 [   50]  Fallback timer (10 msec)
S36 [   20]  Terminate timeout (1 sec)
S37 [   40]  S7: Delay til data mode (1 sec)      [60 seconds  for K56Flex PCM builds 
only]
Strike a key when ready (Q to QUIT)

S38 [   14]  S10: Lost carrier hangup timer (100 msec)
S39 [    7]  Transmit Level Setting
               0:-6dBm 4:-10dBm  8:-14dBm 12:-18dBm
               1:-7dBm 5:-11dBm  9:-15dBm 13:-19dBm
               2:-8dBm 6:-12dBm 10:-16dBm 14:-20dBm
               3:-9dBm 7:-13dBm 11:-17dBm 15:-21dBm
S40 [    4]  Consecutive retrain disconnect threshold
S41 [    5]  V.34 Maximum Symbol Rate
S42 [    0]  V.34 Minimum Symbol Rate
S43 [    2]  V.34 Carrier Frequency
S44 [   11]  V.34 Preemphasis Filter Selection

S45 [    0]  Signaling type for use on T1/R2 trunks
               0 = Null Signaling   4 = Hi Band R2 Signaling
               1 = MF Signaling     5 = Modified R1 Signaling
               2 = DTMF Signaling   6 = SS7/COT Signaling
               3 = Low Band R2 Signaling
S46 [    0]  Call progress detection (bit mapped)
               0 = Disabled   2 = Ringback
               1 = Dialtone   4 = Busy
S47 [    2]  Hayes escape detector
               0 = Disabled   1 = Enabled
               2 = Enabled only in Originate mode
Strike a key when ready (Q to QUIT)

S48 [    1]  AT command processor
               0 = Disabled   1 = Enabled
S49 [    0]  Call Setup delay (100 msec)
S50 [60000]  PCM Maximum Connect Rate
               (28000 to 60000 bps, >=Min)
S51 [28000]  PCM Minimum Connect Rate
               (28000 to 60000 bps, <=Max)
S52 [    1]  PCM Digital Pad compensation
               0 = Disabled   1 = Enabled
S53 [    3]  V.8bis capability (bit mapped)
               0 = All V.8bis Options Disabled - (disables K56flex)
               1 = Enable/Disable V.8bis negotiation
               2 = Enable/Disable V.90 negotiation in V.8bis
               3 = Enable V.90 negotiation in V.8bis - (enables K56flex)
S54 [    8]  General capability (bit mapped)
               0 = All general options disabled
               1 = Reserved for future release
               2 = Enable Aggressive Client Capping
               4 = Force 4 point training
               8 = Enable Power Control
               16= Enable EC Quality Checking
               32-32768 = Reserved for Future Use
S55 [    0]  Reserved for future use
S56 [33600]  Maximum V.34 TX bit rate
               (4800 to 33600 bps, >=Min)
               0 = Disabled   1 = Enabled
S54 [    0]  Host Debug message
               0 = Disabled   1 = Enabled
S55 [    0]  SS7/COT Control
               RTcc.cttt.tttt.tttt RT:0=1780,1=2010 Hz
                ccc:0=R-T,1=T-R,2=R,3=T,4=R&T t:10ms
S54 [    0]  V.8bis Enable
                0=Disabled, 1=Enabled
S55 [    0]  Host Debug Message
S56 [33600]  Maximum V.34 TX bit rate
               (4800 to 33600 bps, >=Min)
S57 [ 9600]  V.110 User Rate
               (600 to 38400 bps, >=Min)
S58 [    0]  V.110 Flow/Clock bits
               0 = Originate
               Set by Q.931 = Answer
S59 [    0]  Reserved for future use
S60 [    0]  Sticky Flags
               0 = All negotiable features disabled
               1=UnsTermMsg
               2=Mica Capabilities Mask
S61 [    0]  Reserved for future use

OK

Ampersand Command Set

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

&Cn (Serial Port DCD Control)

This command is provided for compatibility; it has no effect. (The modem responds OK but takes no action.) Note, however, that n must be 0 or 1. The modem range-checks the value of n, so if you enter something other than 0 or 1, the modem returns an error.


Note It is likely that functionality will be added to this command in a future release of the MICA Portware.


&Dn (DTR Control)

Specifies the modem action when the host's (DTE's) data terminal ready (DTR) transitions off (as when the user's session ends). DTR processing is virtualized on MICA modems because there is no physical EIA interface. lists DTR control command options.


Note It is likely that functionality will be added to this command in a future release of the MICA Portware.


Default

&D3

Table 8 DTR Control Command Options

Command Option
Meaning

&D0

The end of a call does not reset the modem configuration. This option is provided for compatibility.

This option maintains settings within a session. Thus, if you change settings, dial, hear a busy signal, and dial again, your new settings will still be in effect. However, your settings may remain in effect for the next user of the modem.

&D1

The end of a call does not reset the modem configuration. This option is provided for compatibility.

This option maintains settings within a session. Thus, if you change settings, dial, hear a busy signal, and dial again, your new settings will still be in effect. However, your settings may remain in effect for the next user of the modem.

&D2

The end of a call does not reset the modem configuration. This option is provided for compatibility.

This option maintains settings within a session. Thus, if you change settings, dial, hear a busy signal, and dial again, your new settings will still be in effect. However, your settings may remain in effect for the next user of the modem.

&D3

The modem disconnects at the end of a call, then enters command state. The modem configuration is reset to factory defaults. To restore local settings, you must re-apply the modemcap from the Cisco IOS interface of the modem's host device.

Note: The modem treats the end of a connection (hang-up, call drop) as a DTR loss and resets its configuration if &D3 is set.


&F (Restore Factory Defaults)

Hangs up the telephone line, clears the modem, and restores the factory default configuration, with two exceptions: the country code and central office signaling type values are preserved. This command can also be entered as &F0.

&Tn (Diagnostic Test Mode)

Tests the modem hardware. lists modem test options.

Default

&T5

Table 9 Modem Test Options

Command Option
Meaning

&T0

Ends the test in progress.

&T1

Enters local analog loopback (LAL) mode, in which the modem establishes a connection to itself and loops all user data back to the user. This helps to verify that the modem hardware is functioning properly.

&T3

Enters local digital loopback (LDL) mode, in which the modem loops all data received off the line back to the line.

&T5

This option is provided for compatibility; it has no effect. (The modem responds OK but takes no action.)

&T8

Runs a local analog loopback test (see &T1, above) and a self test.


+F Command Set

Fax Class 2 and Class 2.0 modem commands begin with the characters +F. Fax commands are not used by humans; they are accessed by software only.

lists the Fax commands supported by Cisco Portware. For more information on Class 2 commands, see the Electronic Industries Association publication Standards Proposal No. 2388, August 20,1990, Asynchronous Facsimile DCE Control Standard. For more information on Class 2.0 commands, see the Electronic Industries Association publication EIA/TIA-592, Asynchronous Facsimile DCE Control Standard.

Table 10 Fax (+F) Commands Supported by Portware

Fax Class 2 Commands (See EIA/TIA SP 2388)
Fax Class 2.0 Commands (See EIA/TIA-592)

ATDnumber

ATDnumber

AT+FDT

AT+FDT

AT+FET=code

AT+FKS

AT+FKS

AT+FIP

AT+FDR

AT+FDR

AT+FAXERR?

AT+FBO

AT+FBADLIN

AT+FBS?

AT+FBADMUL

AT+FBU

AT+FBOR

AT+FCC

AT+FBUF?

AT+FCLASS

AT+FBUG

AT+FCQ

AT+FCLASS

AT+FCR

AT+FCQ

AT+FCS?

AT+FCR

AT+FCT

AT+FCTCRTY

AT+FEA

AT+FDCC

AT+FFC

AT+FDCS?

AT+FHS?

AT+FDIS

AT+FIE

AT+FDFFC

AT+FIS

AT+FECM

AT+FLI

AT+FLID

AT+FLP

AT+FLNFC

AT+FLO

AT+FLPL

AT+FMI?

AT+FMDL?

AT+FMM?

AT+FMFR?

AT+FMR?

AT+FMINSP

AT+FMS

AT+FPHCTO

AT+FNR

AT+FREV?

AT+FNS

AT+FRBC

AT+FPI

AT+FREL

AT+FPP

AT+FSPL

AT+FPR

AT+FTBC

AT+FPS

AT+FVRFC

AT+FRQ

AT+FWDFC

AT+FRY

 

AT+FSP


In addition to the commands listed above, the following Class 2 commands are defined in TIA/EIA SP-2388 and are supported in MICA Portware: ATA, ATDnumber, ATE0, ATS0=n, and ATV1.

The Class 2.0 command ATDnumber is defined in TIA/EIA-592 and is supported in MICA Portware.

Backslash Command Set

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

\B (Transmit a Break)

Sends a 300-millisecond break that is nondestructive (does not cause data to be lost) and expedited (does not wait behind data that was entered before it). The break can be transmitted in LAP-M mode, MNP mode, and async mode.

For compatibility, MICA modems accept a numeric argument immediately following the \B command, but the argument is ignored.

Default

\B

\D{command} {modem} (DSP Debug Options)

Sends the specified debug command to another modem on the same module as this modem. Replace command with a number from 0 to 4

:

Number
Command

0

Fallback

1

Fall forward

2

Retrain

3

Jtag_immune

4

Reset DSP


Replace modem with the number identifying the modem to which you want to issue the command. For example, enter AT\D2 1 to send a retrain command to modem number 1. If you omit the modem argument, MICA sends the command to the current modem.

In order to use this protected command, you must first execute the DEBUGTHISMODEM (Debug This Modem) command.

Default

\D0

\Qn (Flow Control)

In fax mode, enables and disables flow control for the modem. lists flow control command options.


Note When the modem is not operating in fax mode, this command has no effect.


Default

\Q0

Table 11 Flow Control Command Options (Fax Mode Only)

Command Option
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

Reserved for future use.

\Q3

Reserved for future use.

\Q4

Reserved for future use.


\S (Verbose Display of Current Modem Statistics)

Displays a detailed list of the modem's current link statistics, including the elapsed connect time, counts of bytes in and out, and IP and EC packets sent and received. Press any key to display the next screen. Press Q to cancel the display. If a number is too large to be displayed, its left-most digit appears as a hash mark (#).

This is an example of the output resulting from the \S command:

AT\S

Cisco MICA Hex Modem Link Statistics

Host interface protocol (IP)         RAW
Data compression protocol            V.42bis
Line interface protocol (EC)         V.42 (LAP-M)
Line modulation standard             K56Flex 1.1
Line transfer rates                  46000 bps TX and 28800 bps RX
The modem has been connected         0 days, 0:01:36
Last disconnect reason               0x0000
Current line quality                 3
Strike a key when ready (Q to QUIT)

Bytes sent to host                 518 Bytes received from host              22
Bytes received from line             0 Bytes sent to line                    17
Bytes estimated lost                 0 Bytes resent to line                   0

IP packets received from line        0 IP packets sent to line                0
IP packets received errored          0 IP packets aborted                     0

EC frames received from line         0 EC frames sent to line                 8
EC average RX frame length           0 EC current TX frame length           128
EC NAKs received from line           0 EC NAKs sent to line                   0
EC frames known lost                 0 EC frames retransmitted                0
EC retransmission cycles             2 EC timer recovery's                    2

EC negotiated RX frame length      128 EC negotiated TX frame length        128
EC negotiated RX window             15 EC negotiated TX window               15
EC negotiated compression dict    2048 EC negotiated compression smax        32
Strike a key when ready (Q to QUIT)

                               Tx. / .Rx.
Carrier Frequency (Hz)           0 / 1829
Symbol rate (baud/sec)        8000 / 3200
Trellis code                     0 /   16
Non-linear encoding            Off /  Off
Precoding                      Off /  Off
Constellation shaping          Off /  Off
Preemphasis index                0 /    6
RX level (dBm)                 -13 /  -23
TX level reduction (dBm)         0 /    0
Strike a key when ready (Q to QUIT)


SNR (dB)                        36
Far-end echo (dBm)             -49
Round-trip delay (ms)            3
Frequency offset (Hz)          0.0
Phase roll freq (Hz)           0.0
Phase jitter freq (Hz)         0.0
Phase jitter level (deg)         0
RBS Pattern                   0x20
Digital Pad (dB)               6.0
Digital Pad Compensation       On
SS7/COT Status (iWwOBbT)   0x0000
Strike a key when ready (Q to QUIT)

Line Probe Results:
.......................*
................................*
.................................*
.................................*
................................*
.................................*
.................................*
.................................*
.................................*
.................................*
.................................*
.................................*
.................................*
.................................*
.................................*
.................................*
................................*
................................*
................................*
................................*
................................*
...............................*
.............................*
.........................*
..................*

Strike a key when ready (Q to QUIT)

Line Rate Histogram:


OK

Modem S Register Summary

The modem saves configuration settings in S registers that are similar to Hayes Smartmodem 2400 registers. Each register controls a single modem function or is bit-mapped to control several functions. (For information on how to use bit-mapped registers, see "Bit-Mapped Registers" on page 27 .)

S Register Commands

This section describes AT commands that display or change register values.

Read All Registers

The %R command displays the contents of all S registers. The register contents are displayed as a table in decimal and hexadecimal format.

Read a Configuration Register

The Sn? command displays the contents of register n in decimal format. Register n becomes the reference register.

Point to a New Reference Register

The Sn command sets the modem register pointer to register n. Register n then becomes the reference register for subsequent register commands.

Change the Value of a Register

The Sn=x command changes the value of register n to x, where x is a decimal value. The Sn=>y command changes the value of register n to y, where y is a hexadecimal value. In either case, register n becomes the reference register.

Display the Value of the Reference Register

The ? command displays the value of the last S register referenced in a read, change, or point command.

Change the Value of the Reference Register

The =x command changes the value of the last S register referenced to x, where x is a decimal number. The =>y command changes the value of the last S register referenced to y, where y is a hexadecimal number.

Bit-Mapped Registers

Some S registers are bit-mapped so that they control several functions. (For example, see the sections on S9 and S46.) For each bit-mapped register, the section "S Register Descriptions" includes a table like the one below that lists register values and describes the feature associated with each value. To turn on a single feature, set the register to the appropriate value. To turn on two or more features, add their values and set the register to the total.

For example, suppose you want to set the register described in to disable quick retrains (value = 0), no result codes in answer mode (value = 4), and disable 8S-2D trellis encoding (value = 8). Total the values: 0 + 4 + 8 = 12, and set the register to 12. (This sample register is used for purposes of illustration and does not correspond to any actual MICA register.)

Table 12 Sample Bit-Mapped Register

Bit
Meaning
Values 1

0

Quick retrains

0 Enable quick retrains
1 Disable quick retrains

1, 2

Result codes

0 Result codes
2 No result codes
4 No result codes in answer mode

3, 4, 5, 6, 7

Trellis encoding

0 Enable trellis encoding
8 Disable 8S-2D trellis encoding
16 Disable 16S-4D trellis encoding
32 Disable 32S-4D trellis encoding
64 Disable 64S-4D trellis encoding
128 Disable nonlinear coding

1 Default values are in bold type.


S Register Descriptions

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


Note In future MICA Portware releases, new functionality (including new S registers) will be added. To maintain backward compatibility, existing S register functionality will rarely change.


S0 (Automatic Answer in Seconds)

Specifies the interval in seconds between the time the modem receives notification of an incoming call and the time the modem answers the call.

Range

0 (Answer immediately)
1 to 255 (Wait 1 to 255 seconds before answering)

Default

2 (Answer in two seconds)

S1 (Unused)

Register S1 is not used.

S2 (Escape Code Character)

Specifies the ASCII value of the character used in the escape code. (The escape code is the escape character entered three times in succession.) When the modem is in connect state and it receives the escape code, the modem enters command state. Setting register S2 to 128 or above disables the escape code character.


Note Two registers, S2 and S47, control the escape code. To enable the escape code, you must set S2 to a value in the range 0 to 127, and you must set S47 to enabled (1 or 2). (See "S47 (Hayes +++ Escape Detection)" on page 47 .) To disable the escape code, you can either set S2 to 128 or higher, or you can set S47 to disabled (0).


Range

0 to 255 (ASCII decimal)

Default

43 (+)

S3 (Carriage Return Character)

Specifies the ASCII value of 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 ASCII value for the line feed (LF) character. The line feed character follows a carriage return at the end of long-form result codes. Short-form result codes are sent without line feeds. (See "Vn (Result Code Format)" on page 13 for descriptions of long-form and short-form result codes.)

Range

0 to 127 (ASCII decimal)

Default

10 (Line feed)

S5 (Backspace Character)

Specifies the ASCII value for the backspace (BS) character that you can use to edit the command line.

Range

0 to 127 (ASCII decimal)

Default

8 (Backspace)

S6 (Wait Before Dialing)

Specifies the time the modem waits after going off-hook before it dials. This is a minimum of 2 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 Codes) is set.

Range

2 to 10 seconds

Default

2 seconds

S7 (Wait for Carrier After Dial)

Specifies the time that the modem waits for one of the following before hanging up:

Carrier from the remote modem when this modem is in originate or answer mode

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

Register S7 is linked to register S37 so that the two registers share a single value. Changing the value of S7 changes the value of S37, and changing S37 changes S7.

Range

0 to 255 seconds

Default

60 seconds

S8 (Pause Time for Comma Dial Modifier)

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


Note Register S8 and the comma dial modifier are provided for command compatibility with modems that use these features. They do not function in MICA devices.


Range

0 to 255 seconds

Default

2

S9 (Modem Settings)

The modem uses S9 to store the values that you set with the E, Q, V, &D, and X commands.


Note We recommend that, wherever possible, you use the E, Q, V, &D, and X commands rather than changing S9 directly.


S9 is a bit-mapped register. See "Bit-Mapped Registers" on page 27 for information on how to set bit-mapped registers. defines the bits in S9, with the default values shown in bold.

Table 13 S9 Values

Bit
Meaning
Values 1

0

Command echo

0 No echo (E0)
1 Echo (E1)

1, 2

Result codes

0 Result codes (Q0)
2 No result codes (Q1)
4 No result codes in answer mode (Q2)

3

Result type

0 Short form (V0)
8 Long form (V1)

4, 5

Action on loss of Data terminal ready (DTR) signal

0 Ignore DTR (&D0)
16 Modem enters command state (&D1)
32 Sets modem on hook (&D2)
48 Resets modem (&D3)

6, 7, 8

Connect result code format and call progress

0 Sends connect result code, ignores dial tones and busy signals (X0)
64 Sends verbose connect result code, ignores dial tones and busy signals (X1)
128 Sends verbose connect and no dial tone result codes, ignores busy signals (X2)
192 Sends verbose connect and busy result codes, ignores dial tone (X3)
256 Sends verbose connect, no dial tone, and busy result codes (X4)

1 Default values are in bold type.


Range

0 to 317

Default

317

S10 (Delay for Hang-up After Carrier Loss)

Specifies the time the modem waits before hanging up after loss of carrier. This waiting period allows the modem to recover from a temporary loss of carrier without breaking the connection. Modems at both ends of the connection should have the same 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 were always present; it never hangs up due to loss of carrier. After disconnecting in originate mode, the modem waits a minimum of 5 seconds before going off-hook.

A. Register S10 is linked to register S38 so that the two registers share a single value. Changing the value of S10 changes the value of S38, and changing S38 changes S10.

Range

0 (Do not disconnect after carrier loss)
1 to 255 (Time to disconnect in 0.1-second increments)

Default

14 (1.4 seconds)

S11 (Link Initiate Action)

If the modem is idle (in escape or command state) and receives the ATO (on line) command, it originates or answers a call, based on the contents of this register.

Range

0 (Answer)
1 (Originate)

Default

0 (Answer)

S12 (Number of Async Data Bits)

Specifies the number of asynchronous (start-stop mode) data bits for the call. Outgoing characters have this many significant bits. This number of bits is assembled for each incoming character.


Note If error correction is successfully negotiated (see registers S15, S22, S23, and S24), the modem always uses 8-bit data, regardless of how this register is set.


Range

7 or 8

Default

8

S13 (Parity Configuration)

Specifies the character parity for the call in start-stop (asynchronous) mode. The modem sets this value on outgoing (to line) characters and checks it on incoming characters.


Note If error correction is successfully negotiated (see registers S15, S22, S23, and S24), parity is meaningless, and the setting of this register has no effect.


Range

0 (No parity)
1 (Even parity)
2 (Odd parity)
3 (Space parity—available for V.110 only)
4 (Mark parity—available for V.110 only)

Default

0 (No parity)

S14 (Stop Bit Configuration)

Specifies the number of stop bits for the call in start-stop (asynchronous) mode. The modem sets this value on outgoing (to line) characters.


Note If error correction is successfully negotiated (see registers S15, S22, S23, and S24), stop bits are meaningless, and the setting of this register has no effect.


Range

1 or 2

Default

1

S15 (V.42 Detect Phase Operation)

Enables or disables V.42 detect phase, during which two modems prepare to negotiate a common error correction protocol. This register controls the originating modem's behavior only; in answering mode, detect phase is automatic. The length of the negotiation period is controlled by S16.


Note V.42 detect phase is also disabled under either of the following conditions, regardless of the setting of this register:
-If LAP-M error correction is disabled by setting S23 to 0. See "S23 (V.42 LAP-M Error Correction)" on page 36 .
-If the modulation standard in effect uses FSK (frequency shift keying). FSK modulations include V.21, V.23, and Bell103. For information on setting the modulation standard, see "S29 (Modulation Standard)," on page 38.


Range

0 (Disable V.42 detect phase)
1 (Enable V.42 detect phase)

Default

1 (Enable V.42 detect phase)

S16 (Error Correction Autodetect Timeout)

Specifies, in 100-millisecond steps, the period for which the modem can remain in V.42 detect phase. This timeout period is used only if V.42 detect phase is enabled; see the preceding section,"S15 (V.42 Detect Phase Operation)." See "S25 (Link Protocol Fallback)" on page 37 for a description of the fallback action invoked by the modem if the detect phase times out.

Range

0 (Run detect mechanism until manual intervention occurs or a pattern match is found)
1 to 8589 (Run detect mechanism for 0.1 to 858.9 seconds)

The value of S16 must be smaller than the value of S17. See "S17 (Error Correction Negotiation Timeout)."

Default

50 (5 seconds)

S17 (Error Correction Negotiation Timeout)

Specifies, in 100-millisecond steps, the period during which the modem tries to detect and negotiate an error correction protocol. The clock for this timeout starts at the same time as the clock for the error correction autodetect timeout controlled by register S16. The time allowed for error correction negotiation is the difference between the values of S16 and S17. For example, suppose that S16 is set to 50 (5 seconds) and S17 is set to 100 (10 seconds). If the modems spend the full 5 seconds in autodect phase, only 5 seconds remain for error correction negotiation.

Unsuccessful negotiation results in fallback at the end of the specified time period. The fallback action is set using S25; see "S25 (Link Protocol Fallback)" on page 37 .

Range

0 (Wait indefinitely for protocol negotiation or manual intervention)
1 to 8589 (Wait 0.1 to 858.9 seconds before unsuccessful negotiation causes fallback)

The value of S17 must be larger than the value of S16. See "S16 (Error Correction Autodetect Timeout)."

Default

100 (10 seconds)

S18 (Error Correction Fallback Character)

Specifies the ASCII value of the error correction fallback character. The partner modem can send this character three times during V.42 detect phase (during call establishment) to force this modem to stop negotiating and use the fallback option specified in S25. See "S15 (V.42 Detect Phase Operation)" on page 32 and "S25 (Link Protocol Fallback)" on page 37 .

S18 is a bit-mapped register. See "Bit-Mapped Registers" on page 27 for information on how to set bit-mapped registers. defines the bits in S18, with the defaults shown in bold.

Table 14 Error Correction Fallback Character

Bit
Meaning
Values 1

7

Number of times fallback character must be entered

0 Three times
1 Once

6 to 0

ASCII decimal code for fallback character

0 No fallback character
:
:
13 Carriage return
:
:
256 Disable fallback

1 Default values are in bold type.


Range

0 to 256

Default

13 (three carriage returns)

S19 (Error Correction Retransmission Limit)

Specifies the number of successive data frame transmissions that take place before the modem performs a recovery action and repeats the specified number of retransmissions. If the retransmissions fail, the modem disconnects.


Note The error correction retransmission limit is used only during a call; it is not in effect during link establishment.


Range

0 (Do not disconnect on excessive retransmission; do not perform recovery action before retries)
1 to 65535 (This number of successive frame retransmissions causes recovery, then disconnect)

Default

12 retransmissions

S20 (Error Correction Max Frame Length)

Specifies the maximum length for error correction frames (that is, for MNP, LAP-M, and ARA frames). Higher values are more efficient; lower values work better on a line with poor transmission quality.

Range

64 to 1024 octets of data

Default

256 octets

S21 (Data Compression)

Specifies the methods of data compression that will be permitted. Unless both modems permit a particular data compression method, it will not be used.

S21 is a bit-mapped register.


Note MNP5 can operate only when MNP error correction is active. (See S24 (MNP Error Correction).) Thus, if S21 is set to 2 (MNP5), LAP-M connections will have no data compression.


Range

0 (Data compression disabled)
1 (V.42bis)
2 (MNP5)
3 (V.42bis and MNP5—V.42bis has precedence)

Default

3 (V.42bis and MNP5—V.42bis has precedence)

S22 (ARA Error Correction Options)

Specifies the AppleTalk Remote Access error correction method.

If more than one method of error correction is enabled at each end of the connection, the modem chooses a method based on the following order of precedence:

1. ARA originate only [highest precedence]

2. LAP-M

3. MNP/ARA answer only

4. Fall back (refer to "S25 (Link Protocol Fallback)" on page 37 ) [lowest precedence]

Range

0 (ARA1.0 and ARA2.0 disabled)
1 (ARA1.0 and ARA2.0 enabled for answer only)
2 (ARA1.0 and ARA2.0 enabled for answer, ARA1.0 enabled for call origination)
3 (ARA1.0 and ARA2.0 enabled for answer, ARA2.0 enabled for call origination)


Note For best interaction with Cisco IOS software, we recommend setting S22 to 0.


Default

0 (ARA1.0 and ARA2.0 disabled)

S23 (V.42 LAP-M Error Correction)

Enables or disables V.42 (LAP-M) error correction.

If more than one method of error correction is enabled at each end of the connection, the modem chooses a method based on the following order of precedence:

1. ARA originate only [highest precedence]

2. LAP-M

3. MNP/ARA answer only

4. Fall back (refer to "S25 (Link Protocol Fallback)" on page 37 ) [lowest precedence]


Note See also S15 (V.42 Detect Phase Operation).


Range

0 (V.42 (LAP-M) disabled)
1 (V.42 (LAP-M) originate and answer enabled)

Default

1 (V.42 (LAP-M) originate and answer enabled)

S24 (MNP Error Correction)

Enables or disables MNP error correction.

If more than one method of error correction is enabled at each end of the connection, the modem chooses a method based on the following order of precedence:

1. LAP-M [highest precedence]

2. ARA

3. MNP

4. Fall back (refer to "S25 (Link Protocol Fallback)" on page 37 ) [lowest precedence]

Range

0 (MNP disabled)
1 (MNP originate and answer enabled)

Default

1 (MNP originate and answer enabled)

S25 (Link Protocol Fallback)

If either V.42 detect phase or error correction negotiation phase (see S15, S16, and S17) ends in failure to agree on an error correction protocol, the modem takes the fallback action specified in this register. The partner modem can also force this modem to fall back using the character specified in S18. In asynchronous framing mode (S25 = 0), the modem uses the settings of S12, S13, and S14. For more information on V.42 detect phase, see "S15 (V.42 Detect Phase Operation)" on page 32 , "S16 (Error Correction Autodetect Timeout)" on page 33 , "S17 (Error Correction Negotiation Timeout)" on page 33 , and "S18 (Error Correction Fallback Character)" on page 34 .

Range

0 (Enter asynchronous framing mode (start/stop/parity bits))
1 (Enter synchronous framing mode (raw 8 bits to line))
2 (Disconnect)

Default

0 (Enter asynchronous framing mode (start/stop/parity bits))

S26 (DSP Processor MVIP TDM Slice)

Indicates the time-division multiplexing (TDM) pair assigned to the digital signal processor (DSP) on the modem card. There are three DSPs per modem card, and each processor is assigned one TDM pair.


Note The value of this register is set automatically to match a value determined by the router or access server. The value of S26 is visible for diagnostic purposes, and the system does not allow you to change it. If you try, the modem returns ERROR.


Range

0 to 15

Default

0

S27 (Calling Tone)

Enables or disables the V.25 optional calling tone, a 1300-Hz signal that allows the called party to determine whether the calling device is a modem. Some phone systems outside the United States and Canada require a modem to send a calling tone when it originates a connection.

Range

0 (Calling tone disabled)
1 (Send calling tone)

Default

0 (Calling tone disabled)

S28 (Guard Tone)

Enables or disables the 1800-Hz guard tone in V.22 and V.22bis modes. Some phone systems outside the United States and Canada require a modem to send a guard tone.

Range

0 (Guard tone disabled)
1 (Use guard tone (V.22 and V.22bis only))

Default

0 (Guard tone disabled)

S29 (Modulation Standard)

Specifies the modulation standards to be used. When negotiating a connection with another modem, the modem attempts to set up a connection based on a standard acceptable to both, based on the sequence and timing of generated and detected tones. For example, when S29 is set to 0, the modem opens negotiations by generating ANSAM, a single tone that is a valid starting point for many standards, including K56FLEX, V.90, V.34+, V.34, V.32bis, V.32, V.22bis, V.22, and V.21. If there is no response, the modem generates a sequence specific to V.32bis. Then the modem tries V.22/V.22bis, then V.32 again, then V.21, and so on.

If both modems are MICA, they will at a minimum be able to agree on one of the standards in setting 4. If one modem is not MICA, the modems may fail to negotiate a standard and disconnect.

Digital and Analog Modulations

K56Flex and V.90 (used in settings 5 and 6 of this register) use digital pulse code modulation (PCM); the other types of modulation (V.34, V.22, etc.) are analog.

Effect of FSK on Framing

Certain modulations, including V.21, V.23, and Bell103, use frequency shift keying (FSK). FSK causes MNP connections to use MNP2 (character mode framing), rather than the standard MNP3 (sync framing).

Range

Value
Modulation Standards

01

V.34+, V.34
V.32bis, V.32
V.23
V.22bis, V.22
V.21
BELL212
BELL103

11

V.34+, V.34
V.32bis, V.32
V.23
V.22bis, V.22
V.21
BELL212
BELL103

2

V.32terbo, V.32bis, V.32
V.23
V.22bis, V.22
V.21
BELL212
BELL103

3

V.32bis, V.32
V.23
V.22bis, V.22
V.21
BELL212
BELL103

4

V.23
V.22bis, V.22
V.21
BELL212
BELL103

5

K56Flex 1.1
V.34+, V.34
V.32bis, V.32
V.23
V.22bis, V.22
V.21
BELL212
BELL103

6

V.90
K56Flex 1.1
V.34+, V.34
V.32bis, V.32
V.23
V.22bis, V.22
V.21
BELL212
BELL103

7

SS7/COT

8

V.110

9

PIAFS

1 For historical reasons, settings 0 and 1 are functionally identical.


Default

9


Note In the PIAFS release, 9 is the only valid setting for S29.


S30 (Maximum Connect Rate)

Maximum rate at which the modem will pass data, in bits per second. If this modem's range of connect rates does not overlap with the other modem's range (that is, if one modem's maximum connect rate is lower than the other modem's minimum connect rate (see S31)), a connection cannot be established and the modems disconnect.


Note If the modem is using K56Flex or V.90 modulation, S30 and S31 control the data rate in the receive direction only; S50 and S51 control transmit speeds. See "S50 (Maximum PCM Connect Rate)," on page 48, and "S51 (Minimum PCM Connect Rate)," on page 49. If the modem is not using K56Flex or V.90, S30 and S31 control the rates of both received and transmitted data. shows which S registers control data rates under the various modulation standards.


Table 15 S Registers Controlling Data Rates Under Different Modulation Standards

Modulation Standard
S Registers Controlling Transmit Rate
S Registers Controlling Receive Rate

V.34 and lower

S30 and S31

S30 and S31

K56Flex

S50 and S51

S30 and S31

V.90

S50 and S51

S30 and S31


Range

75 to 33600 bps
This value must be equal to or greater than the value of S31.

Default

33600 bps

S31 (Minimum Connect Rate)

Minimum rate at which the modem will pass data, in bits per second. If this modem's range of connect rates does not overlap with the other modem's range (that is, if one modem's maximum connect rate (see S30) is lower than the other modem's minimum connect rate), a connection cannot be established and the modems disconnect.


Note If the modem is using K56Flex or V.90 modulation, S30 and S31 control the data rate in the receive direction only; S50 and S51 control transmit speeds. See "S50 (Maximum PCM Connect Rate)," on page 48, and "S51 (Minimum PCM Connect Rate)," on page 49. If the modem is not using K56Flex or V.90, S30 and S31 control the rates of both received and transmitted data. , above, shows which S registers control data rates under the various modulation standards.


Range

75 to 33600 bps
This value must be equal to or less than the value of S30.

Default

300 bps

S32 (Signal Quality Threshold)

Specifies the minimum bit error rate at which the modem initiates recovery, and below which the modem considers the line to be good. Recovery consists of a retrain or of falling back to a lower data rate, depending on the modulation standard currently in use.

Range

0 (No action on bit errors)
1 (Bit error rates of at least 1 in 100 cause recovery)
2 (Bit error rates of at least 1 in 1000 cause recovery)
3 (Bit error rates of at least 1 in 10,000 cause recovery)
4 (Bit error rates of at least 1 in 100,000 cause recovery)
5 (Bit error rates of at least 1 in 1,000,000 cause recovery)

Default

2 (Bit error rates of at least 1 in 1000 cause recovery)

S33 (Speed Change Squelch Timer)

Specifies, in milliseconds, the time to delay after a speed shift before another speed shift is allowed. See S34 (Fall-forward Timer).

Range

0 (Timer disabled)
1 to 8589 (Delay time; maximum value is equivalent to about 8.5 seconds)

Default

500 (0.5 second)

S34 (Fall-forward Timer)

The elapsed time, in 10-millisecond increments, during which signal quality is consistently good, that the modem waits before increasing transmission speed. To set signal quality, see "S32 (Signal Quality Threshold)" on page 41 .

S34 is not used in its normal meaning (fall-forward timer) with PIAFS, but rather as a PIAFS-specific bitmapped register. If you reverse telnet to a PIAFS line and enter AT%R, by default only the "Inhibit Extended FI (2.1)" is set. By setting S34=20, you can clear this bit and set the "Do Prior Notify (2.1)" and "Inhibit Extended Sync (2.1)" bits, as shown in the following example:

S33 [    0]  PIAFS Type1 Rate Shift Interval (seconds)
S34 [    2]  PIAFS Test Flags (bitmap)
               1 = Inhibit PIAFS2.1            16 = Do Prior Notify (2.1)
        2 = Inhibit Extended FI (2.1)   32 = Priority 2.1 > 2.0               4
= Inhibit Extended Sync (2.1)               8 = Inhibit Extended CIXP (2.1)S35 [
    0]  PIAFS RFU

Range

0 (Fall-forward disabled)
1 to 8589 (Wait 0.01 to 85.89 seconds before speed increase)

Default

1000 (10 seconds)

S35 (Fallback Timer)

The elapsed time, in 10-millisecond increments, during which signal quality is consistently poor, that the modem waits before decreasing transmission speed. To set signal quality, see "S32 (Signal Quality Threshold)" on page 41 .

Range

0 (Fallback disabled)
1 to 8589 (Wait 0.01 to 85.89 seconds before fallback)

Default

50 (0.5 second)

S36 (Terminate Timeout)

Specifies, in seconds, the maximum time to delay after a host disconnect request before forcing the link to disconnect. (The disconnect request can be an ATH (hang up) command or a Cisco IOS request from the router or access server.) During this period, the modem sends buffered data and then clears the link. Low values cause the modem to disconnect faster, but may result in some final data being lost and in the remote modem hanging on to a dead line for a while.

Range

0 to 858 seconds

Default

20 seconds

S37 (Wait for Carrier After Dial)

Register S37 is linked to register S7 so that the two registers share a single value. Changing the value of S37 changes S7, and changing S7 changes S37. For a description of the function of the two registers, see "S7 (Wait for Carrier After Dial)" on page 29 .

S38 (Delay for Hang-up After Carrier Loss)

Register S38 is linked to register S10 so that the two registers share a single value. Changing the value of S38 changes S10, and changing S10 changes S38. For a description of the function of the two registers, see "S10 (Delay for Hang-up After Carrier Loss)" on page 31 .

S39 (Transmit Level Setting)

Specifies the decibel level the modem uses for transmissions.


Note   The actual range of transmit levels you can use is specified by the country in which the modem is operating. Transmit levels are also controlled by the country code setting that is made at installation. For example, if you set S39 to 3, -9 dBm, but your country imposes a ceiling of -10 dBm on transmit levels, your modem will transmit at -10 dBm, despite the setting of -9 dBm.


Range

Value
Decibel level

0

-6 dBm

1

-7 dBm

2

-8 dBm

3

-9 dBm

4

-10 dBm

5

-11 dBm

6

-12 dBm

7

-13 dBm

8

-14 dBm

9

-15 dBm

10

-16 dBm

11

-17 dBm

12

-18 dBm

13

-19 dBm

14

-20 dBm

15

-21 dBm


Default

7 (-13 dBm)

S40 (Consecutive Retrain Disconnect Threshold)

After this number of consecutive failed retrains, the modem disconnects. (If the modem loses synchronization with its partner, it can try to regain synchronization with a retrain.)

Range

0 (Never disconnect because of failed retrains)
1 to 255 (Disconnect after this number of failed retrains)

Default

4 retrains

S41 (V.34 Maximum Symbol Rate)

Specifies the maximum symbol (baud) rate that pertains when the modem is using V.34 modulation. (To select the modulation standard, see "S29 (Modulation Standard)" on page 38 .) This register is read-only unless the DEBUGTHISMODEM command has been executed. See "DEBUGTHISMODEM (Debug This Modem)," on page 8.

Range

0 (2400 baud)
1 (2743 baud)
2 (2800 baud)
3 (3000 baud)
4 (3200 baud)
5 (3429 baud)

Default

5 (3429 baud)

S42 (V.34 Minimum Symbol Rate)

Specifies the minimum symbol (baud) rate that pertains when the modem is using V.34 modulation. (To select the modulation standard, see "S29 (Modulation Standard)" on page 38 .) This register is read-only unless the DEBUGTHISMODEM command has been executed. See "DEBUGTHISMODEM (Debug This Modem)," on page 8.

Range

0 (2400 baud)
1 (2743 baud)
2 (2800 baud)
3 (3000 baud)
4 (3200 baud)
5 (3429 baud)

Default

0 (2400 baud)

S43 (V.34 Carrier Frequency)

Specifies the carrier frequency that pertains when the modem is using V.34 modulation. (To change the modulation standard, see "S29 (Modulation Standard)" on page 38 .) This register is read-only unless the DEBUGTHISMODEM command has been executed. See "DEBUGTHISMODEM (Debug This Modem)," on page 8.

Range

0 (Low carrier)
1 (High carrier)
2 (Automatic carrier selection)

Default

2 (Automatic carrier selection)

S44 (V.34 Preemphasis Filter Selection)

Specifies the filter to use on the transmit signal when the modem is using V.34 modulation. (To select the modulation standard, see "S29 (Modulation Standard)" on page 38 .) The default setting, 11, selects a filter automatically based on line impairments and conditions. Settings 0 to 10 select fixed preemphasis filters without regard for line impairments and conditions. We recommend that you leave this register set to the default value, 11 (automatic selection), unless you are advised otherwise by a Cisco representative. For more information on preemphasis filter selection, see CCITT Recommendation V.34. This register is read-only unless the DEBUGTHISMODEM command has been executed. See "DEBUGTHISMODEM (Debug This Modem)," on page 8.

Range

0 to 10 (Select fixed filters)
11 (Automatic preemphasis filter selection)

Default

11 (Automatic preemphasis filter selection)

S45 (Signaling Type)

Specifies the type of transmit and receive signaling the modem uses on T1/R2 trunks.

Setting 6 puts the modem into a mode where it performs SS7/COT signaling. This prevents the modem from operating normally—that is, from operating as a modem. Typically this setting is initiated by software; it is not recommended for human users.

If you set S29 to 8 for V.110, the modem ignores the value of this register and uses null signaling (0).

Range

0 (Null signaling)
1 (MF signaling)
2 (DTMF signaling)
3 (Low-band R2 signaling)
4 (High-band R2 signaling)
5 (Modified R1 signaling)
6 (SS7/COT signaling)

Default

0 (Null signaling)

S46 (Call Progress Tone Detection)

Determines whether the modem detects dial tones, ring-back tones, and busy signals emitted by other devices during call establishment. S46 is a bit-mapped register. See "Bit-Mapped Registers" on page 27 for information on how to set bit-mapped registers. The bits are defined in .

Table 16 Call Progress Tone Detection

Bit
Meaning
Values 1

0

Dial tone

0 Ignore dial tone
1 Detect dial tone

1

Ring back

0 Ignore ring back
2 Detect ring back

2

Busy signal

0 Ignore busy signal
4 Detect busy signal

1 Default values are in bold type.


Range

0 to 7

Default

0 (No tone detection)

S47 (Hayes +++ Escape Detection)

Enables or disables detection of the escape code (+++ by default) that you enter to put the modem into escape mode. Escape mode enables you to enter commands while this modem is connected to another modem.


Note   Two registers, S2 and S47, control the escape code. To enable the escape code, you must set S2 to a value in the range 0 to 127, and you must set S47 to enabled (1 or 2). (See "S2 (Escape Code Character)" on page 28 .) To disable the escape code, you can either set S2 to 128 or higher, or set S47 to disabled (0).

In addition, if you use register S48 to turn off the AT command processor, executing the escape code will have no effect.


If escape code detection is enabled on the modem for a host that echoes the user's input, the host modem may inadvertently be placed in online command mode when a user enters the escape code on his or her own modem. For this reason, we recommend disabling escape code detection (setting S47 to 0) on host/server modems.

Range

0 (Disabled)
1 (Enabled)
2 (Enabled in originate mode only)

Default

2 (Enabled in originate mode only)

S48 (AT Command Processor)

Enables or disables the AT command processor.

Range

0 (Disabled)
1 (Enabled)

Default

1 (Enabled)

S49 (Call Setup Delay)

Specifies, in 100-msec increments, the amount of time that the modem waits before initiating a new link.

Range

0 (No delay before link initiation)
1 to 255 (Wait 0.1 to 25.5 seconds)

Default

0 (No delay before link initiation)

S50 (Maximum PCM Connect Rate)

Maximum rate, in bits per second, at which the modem will transmit data when it is using the K56Flex or V.90 modulation standards. (Use S29 to set the modulation standard.) This parameter is unidirectional; it does not affect the speed of data received. If this modem's range of connect rates does not overlap with the other modem's range (that is, if one modem's maximum connect rate is lower than the other modem's minimum connect rate (see S51)), a connection cannot be established and the modems disconnect.

Pulse code modulation (PCM) is digital; the other types of modulation available on MICA modems (V.34, V.22, etc.) are analog.


Note   If the modem is using K56Flex or V.90 modulation, S50 and S51 control the data rate in the transmit direction only; S30 and S31 control receive speeds. See "S30 (Maximum Connect Rate)," on page 40, and "S31 (Minimum Connect Rate)," on page 41. If the modem is not using K56Flex or V.90, S30 and S31 control the rates of both received and transmitted data. shows which S registers control data rates under the various modulation standards.


Table 17 S Registers Controlling Data Rates Under Different Modulation Standards

Modulation Standard
S Registers Controlling Transmit Rate
S Registers Controlling Receive Rate

V.34 and lower

S30 and S31

S30 and S31

K56Flex

S50 and S51

S30 and S31

V.90

S50 and S51

S30 and S31


Range

28000 bps to 60000 bps
This value must be equal to or greater than the value of S51.

Default

60000 bps

S51 (Minimum PCM Connect Rate)

Minimum rate, in bits per second, at which the modem will transmit data when it is using the K56Flex or V.90 modulation standards. (Use S29 to set the modulation standard.) This parameter is unidirectional; it does not affect the speed of data received. If this modem's range of connect rates does not overlap with the other modem's range (that is, if one modem's maximum connect rate (see S50) is lower than the other modem's minimum connect rate), a connection cannot be established and the modems disconnect.


Note   If the modem is using K56Flex or V.90 modulation, S50 and S51 control the data rate in the transmit direction only; S30 and S31 control receive speeds. See "S30 (Maximum Connect Rate)," on page 40, and "S31 (Minimum Connect Rate)," on page 41. If the modem is not using K56Flex or V.90, S30 and S31 control the rates of both received and transmitted data. , above, shows which S registers control data rates under the various modulation standards.


Range

28000 bps to 60000 bps
This value must be equal to or less than the value of S50.

Default

28000 bps

S52 (Digital Pad Compensation)

For V.90 transmissions, MICA can boost the signal it transmits when the partner analog modem detects a digital pad (attenuator) in the circuit. Boosting the signal to compensate for digital pad attenuation can improve throughput. This register controls whether MICA allows the partner analog modem to compensate on circuits where a digital pad is detected.

This register has no effect on transmissions in modes other than V.90.

Range

0 (No compensation)
1 (This modem supports digital pad compensation for V.90 transmissions)

Default

0

S52 (Digital Pad Compensation)

For V.90 transmissions, MICA can boost the signal it transmits when the partner analog modem detects a 3 dB or 6 dB digital pad (attenuator) in the circuit. Boosting the signal to compensate for digital pad attenuation can improve throughput. This register controls whether MICA allows the partner analog modem to compensate on circuits where a digital pad is detected.

This register has no effect on transmissions in modes other than V.90.

Range

0 (No compensation)
1 (This modem supports digital pad compensation for V.90 transmissions)

Default

1

S53 (V.8bis Capability)

V.8bis is a protocol used for exchanging K56Flex information. It is used during modem train-up prior to all other exchanges/tones. If you are not expecting to connect to K56Flex clients, disable V.8bis (set this register to 0) to shorten modem train-up times for other protocols by about 3 seconds.


Note   Enabling V.8bis has no effect unless you are using a modulation standard that includes K56Flex. To set the modulation standard, use register S29 (Modulation Standard).



Note   Setting S53 to 0 effectively disables K56Flex, because K56Flex cannot operate without V.8bis.


S53 is a bit-mapped register. See "Bit-Mapped Registers" on page 27 for information on how to set bit-mapped registers. The bits are defined in .

Table 18 V.8bis Capability

Bit
Meaning
Values 1

0

V.8bis negotiation

0 Disable V.8bis negotiation
1 Enable V.8bis negotiation

1

V.90 negotiation in V.8bis

0 Disable V.90 negotiation in V.8bis
2 Enable V.90 negotiation in V.8bis

1 Default values are in bold type.


Range

0 to 3

Default

3 (Enable V.8bis negotiation and V.90 negotiation in V.8bis)

S54 (General Options)

S54 is a bit-mapped register that controls several options. See "Bit-Mapped Registers" on page 27 for information on how to set bit-mapped registers. The bits are defined in .

Table 19 General Options

Bit
Meaning
Values 1

0

Sends automatic messages to host router when a modem session has debug information to log

0 Disable host debug messages
1 Enable host debug messages

1

Aggressive client capping

0 Disable aggressive client capping
2 Enable aggressive client capping

2

Force 4-point training

0 Do not force 4-point training
4 Force 4-point training

3

Power control

0 Disable power control
8 Enable power control

4

Error correction quality checking

0 Disable error correction quality checking
16 Enable error correction quality checking

1 Default values are in bold type.


Range

0 to 31

Default

8

S55 (SS7/COT Control)

Do not set this bit-mapped register. It is reserved for SS7/COT control, and is set by the host router or access server. (SS7/COT is in effect only when S45 is set to 6, SS7/COT signaling. See the "S45 (Signaling Type)" section).

The bits in S55 are defined in , which is provided only so that you can read the register. Bit 15 is the most significant bit.

Table 20 SS7/COT Control

Bit
Meaning
Values 1

15

Receive frequency

0 1780 Hz
1 2010 Hz

14

Transmit frequency

0 1780 Hz
1 2010 Hz

13, 12, 11

Operation

0 Transmit, then receive
1 Receive, then transmit
2 Receive monitor only2
3 Transmit generate only2
4 Receive monitor and transmit generate2
5 to 7 Reserved for future use

10 to 0

Timeout period, in increments of 10 ms

0 No timeout
1 10 ms
2 20 ms
:
:
2000 20,000 ms (20 seconds)

1 Default values are in bold type.

2 Test modes—not for operational use.


Range

0 to 2009

Default

0

S56 (Set Maximum V.34+ Transmit Rate)

Set the maximum allowable V.34+ transmit rate in bits per second (bps). This register is read-only unless the DEBUGTHISMODEM command has been executed. See "DEBUGTHISMODEM (Debug This Modem)," on page 8.

Range

4800, 7200, 9600, 12000, 14400, 16800, 19200, 21600, 24000, 26400, 28800, 31200, 33600

Default

33600

S57 (V.110 and PIAFS User Rate)

Do not set this register; it is set by the host router or access server. S57 specifies the user rate (send and receive speed) for originating V.110 and PIAFS calls. The user rate is communicated to the remote modem.

Range

PIAFS: 32000 or 64000
V.110: 600, 1200, 2400, 4800, 7200, 9600, 14400, 19200, 38400


Note   In PIAFS releases, this register defaults to 64000 if the host device sets it to any value other than 32000 or 64000.


Default

32000

S58 (V.110 Flow Control and Clock bits)

S58 is set by the host. If the modem is in originate mode, S58 is set to 0. If the modem is in answer mode, the host sets S58 according to Q.931 call setup standards. The information is useful to the remote modem for debugging.

Range

Per Q.931

Default

0

S59 (Unused)

Register S59 is not used.

S60 (Sticky Flags)

Do not set this bit-mapped register. It is reserved for use by the host router or access server. See "Bit-Mapped Registers" on page 27 for information on bit-mapped registers. The bits are defined in ; this information is provided only so that you can read the register. In the table, default values are shown in bold type.

Table 21 Sticky Flags

Bit
Meaning
Values 1

0

Specifies whether the host accepts expedited Terminate_Event messages, which convey accounting information about call termination from the modem to the host.

0 Disable Terminate_Event messages
1 Enable Terminate_Event messages

1

Specifies whether the modem will send a capabilities mask, which identifies the modem's call type capabilities, to the host. The capabilities mask is sent once in the lifespan of a Portware release. Based on the information sent, the host sets various S registers, including S12, S13, S14, S29 (V.110 only) S55, and S57.

0 Disable capabilities mask
2 Enable capabilities mask

1 Default values are in bold type.


Range

0 to 15

Default

0

S61 (Unused)

Register S61 is not used.

Cisco Connection Online

Cisco Connection Online (CCO) is Cisco Systems' primary, real-time support channel. Maintenance customers and partners can self-register on CCO to obtain additional information and services.

Available 24 hours a day, 7 days a week, CCO provides a wealth of standard and value-added services to Cisco's customers and business partners. CCO services include product information, product documentation, software updates, release notes, technical tips, the Bug Navigator, configuration notes, brochures, descriptions of service offerings, and download access to public and authorized files.

CCO serves a wide variety of users through two interfaces that are updated and enhanced simultaneously: a character-based version and a multimedia version that resides on the World Wide Web (WWW). The character-based CCO supports Zmodem, Kermit, Xmodem, FTP, and Internet e-mail, and it is excellent for quick access to information over lower bandwidths. The WWW version of CCO provides richly formatted documents with photographs, figures, graphics, and video, as well as hyperlinks to related information.

You can access CCO in the following ways:

WWW:  http://www.cisco.com

WWW:  http://www-europe.cisco.com

WWW:  http://www-china.cisco.com

Telnet:  cco.cisco.com

Modem:  From North America, 408 526-8070; from Europe, 33 1 64 46 40 82. Use the following terminal settings: VT100 emulation; databits: 8; parity: none; stop bits: 1; and connection rates up to 28.8 kbps.

For a copy of CCO's Frequently Asked Questions (FAQ), contact cco-help@cisco.com. For additional information, contact cco-team@cisco.com.


Note   If you are a network administrator and need personal technical assistance with a Cisco product that is under warranty or covered by a maintenance contract, contact the Cisco Technical Assistance Center (TAC) at 800 553-2447, 408 526-7209, or tac@cisco.com. To obtain general information about Cisco Systems, Cisco products, or upgrades, contact 800 553-6387, 408 526-7208, or cs-rep@cisco.com.


Document Number OL-0376-01

OL-0376-01