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Table Of Contents
AT Command Set and Register Summary for MICA Six-Port Modules with PIAFS
Setting Up NEC Aterm Terminal Adapters
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
DEBUGTHISMODEM (Debug This Modem)
Sn (Point to a New Configuration Register)
Sn? (Read Configuration Register)
%R (Verbose Display of the Modem Configuration)
\D{command} {modem} (DSP Debug Options)
\S (Verbose Display of Current Modem Statistics)
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
S0 (Automatic Answer in Seconds)
S3 (Carriage Return Character)
S7 (Wait for Carrier After Dial)
S8 (Pause Time for Comma Dial Modifier)
S10 (Delay for Hang-up After Carrier Loss)
S12 (Number of Async Data Bits)
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)
S22 (ARA Error Correction Options)
S23 (V.42 LAP-M Error Correction)
S26 (DSP Processor MVIP TDM Slice)
Digital and Analog Modulations
S32 (Signal Quality Threshold)
S33 (Speed Change Squelch Timer)
S37 (Wait for Carrier After Dial)
S38 (Delay for Hang-up After Carrier Loss)
S40 (Consecutive Retrain Disconnect Threshold)
S41 (V.34 Maximum Symbol Rate)
S42 (V.34 Minimum Symbol Rate)
S44 (V.34 Preemphasis Filter Selection)
S46 (Call Progress Tone Detection)
S47 (Hayes +++ Escape Detection)
S50 (Maximum PCM Connect Rate)
S51 (Minimum PCM Connect Rate)
S52 (Digital Pad Compensation)
S52 (Digital Pad Compensation)
S56 (Set Maximum V.34+ Transmit Rate)
S57 (V.110 and PIAFS User Rate)
S58 (V.110 Flow Control and Clock bits)
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
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
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
.
Use these guidelines when you send AT commands to a modem:
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•
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•
•
•
•
•
•
•
–
–
–
–
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:
•
•
•
Note
Aterm IW60
In the commands below, replace dial string with the telephone number to be dialed.
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.
Aterm IT75
In the commands below, replace dial string with the telephone number to be dialed.
Command Summary for Aterm Devices
This is a brief description of the commands used with the Aterm terminal adaptors.
Setting Up the NTT-ME MN128 Terminal Adaptor
Use the commands listed here to set up the NTT-ME terminal adapter model MN128.
Note
In the commands below, replace dial string with the telephone number to be dialed.
Command Summary for NTT-ME MN128 Devices
This is a brief description of the commands used with the NTT-ME MN128 terminal adaptor.
Setting Up the Furukawa Mucho-E Terminal Adaptor
Use the commands listed here to set up the Furukawa Mucho-E terminal adaptor.
Note
In the commands below, replace dial string with the telephone number to be dialed.
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
.
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
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
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) 555-1234The 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:
•
•
•
•
•
•
•
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) 555-1234The 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:
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•
•
•
•
•
•
En (Command Echo)
Configures the modem to echo commands to the workstation. lists command echo options.
Default
E1
Table 2 Command Echo Options
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
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
Default
Q0
Table 4 Quiet Mode Command Options
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 selectedT (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
Table 5 Result Codes
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
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
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%RCisco MICA Hex Modem Module ConfigurationCONFIGURATION SUMMARYREG = HEX/DEC REG = HEX/DEC REG = HEX/DEC REG = HEX/DECS00 = 0001/1 S02 = 002B/43 S03 = 000D/13 S04 = 000A/10S05 = 0008/8 S06 = 0002/2 S07 = 0028/40 S08 = 0002/20S09 = 013D/317 S10 = 000E/14 S11 = 0000/0 S12 = 0008/8S13 = 0000/0 S14 = 0001/1 S15 = 0001/1 S16 = 0032/50S17 = 0064/100 S18 = 000D/13 S19 = 000C/12 S20 = 0100/256S21 = 0003/3 S22 = 0001/1 S23 = 0001/1 S24 = 0001/1S25 = 0000/0 S26 = 0000/0 S27 = 0000/0 S28 = 0000/0S29 = 0009/9 S30 = 8340/33600 S31 = 012C/300 S32 = 0002/2S33 = 01F4/500 S34 = 03E8/1000 S35 = 0032/50 S36 = 0014/20S37 = 0028/40 S38 = 000E/14 S39 = 0007/7 S40 = 0004/4S41 = 0005/5 S42 = 0000/0 S43 = 0002/2 S44 = 000B/11S45 = 0000/0 S46 = 0000/0 S47 = 0002/2 S48 = 0001/1S49 = 0000/0 S50 = EA60/60000 S51 = 7D00/32000 S52 = 0001/1S53 = 0003/3 S54 = 0008/8 S55 = 0000/0 S56 = 8340/33600S57 = 0000/0 S58 = 0000/0 S59 = 0000/0 S60 = 0000/0S61 = 0000/0Reg Value Description--- ----- -----------S0 [ 1] Automatic AnswerS2 [ 43] Escape Code CharacterS3 [ 13] Carriage Return CharacterS4 [ 10] Line Feed CharacterS5 [ 8] Backspace CharacterS6 [ 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 Register0 = Command echo0 = E0 - No echo1 = E1 - Echo1,2 = Result codes0 = Q0 - Output result code1 = Q1 - No result codes2 = Q2 - No result codes in Answer mode3 = Result type0 = V0 - Short form1 = V1 - Long form4,5 = Data Terminal Ready0 = &D0 - Ignore DTR1 = &D1 - Modem enters command state2 = &D2 - Modem goes on hook3 = &D3 - Modem is reset6,7,8 = CONNECT Result Code & Call ProgressText Busy NoDT0 = X0 - N N N1 = X1 - Y N N2 = X2 - Y N Y3 = X3 - Y Y N4 = X4 - Y Y YS10 [ 14] Automatic Disconnect DelayS11 [ 0] Link Initiate Action0 = Answer1 = OriginateS12 [ 8] Number of async data bits- NO PROTOCOL ASYNC MODE ONLY -7 = 7 data bits8 = 8 data bitsS13 [ 0] Parity Configuration- NO PROTOCOL ASYNC MODE ONLY -0 = No parity1 = Even parity2 = Odd parity3 = Space parity4 = Mark parityStrike a key when ready (Q to QUIT)S14 [ 1] Stop Bit Configuration- NO PROTOCOL ASYNC MODE ONLY -1 = 1 stop bit 2 = 2 stop bitsS15 [ 1] V.42 detect phase0 = Disabled 1 = EnabledS16 [ 50] EC Autodetect Time-out (100 msec)S17 [ 100] EC Negotiate Time-out (100 msec)S18 [ 13] EC Fallback CharacterS19 [ 12] EC Retransmission LimitS20 [ 256] EC max packet length (64..1024)max window = 8192/<length>S21 [ 3] Data Compression0 = Disabled1 = V.42bis2 = MNP53 = MNP5 or V.42bisS22 [ 0] ARA Error Correction0 = Disabled1 = Answer any ARA, don't originate2 = Originate ARA1.0, answer any3 = Originate ARA2.0, answer anyS23 [ 1] V.42 (LAPM) Error Correction0 = Disabled 1 = EnabledS24 [ 1] MNP (2-4) Error Correction0 = Disabled 1 = EnabledStrike a key when ready (Q to QUIT)S25 [ 0] Fallback Link Protocol0 = Async data mode1 = Sync data mode2 = HangupS26 [ 0] MVIP TimesliceS27 [ 0] Calling Tone0 = Disabled 1 = EnabledS28 [ 0] Guard Tone0 = Disabled 1 = EnabledS29 [ 9] Modulation Standards0 = V.34+ Automode, with terbo1 = V.34+ Automode, no terbo2 = V.32 terbo Automode3 = V.32bis Automode4 = V.22bis Automode5 = K56FLEX 1.1 Automode6 = V.90 Automode7 = SS78 = V.110 Automode9 = PIAFSS30 [33600] Maximum Connect Rate(75 to 33600 bps, >=Min)S31 [ 300] Minimum Connect Rate(75 to 33600 bps, <=Max)S32 [ 2] Signal Quality Threshold0 = No action on bit errors1 = Bers >= 1:1002 = Bers >= 1:10003 = Bers >= 1:100004 = Bers >= 1:1000005 = Bers >= 1:1000000S33 [ 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 Setting0:-6dBm 4:-10dBm 8:-14dBm 12:-18dBm1:-7dBm 5:-11dBm 9:-15dBm 13:-19dBm2:-8dBm 6:-12dBm 10:-16dBm 14:-20dBm3:-9dBm 7:-13dBm 11:-17dBm 15:-21dBmS40 [ 4] Consecutive retrain disconnect thresholdS41 [ 5] V.34 Maximum Symbol RateS42 [ 0] V.34 Minimum Symbol RateS43 [ 2] V.34 Carrier FrequencyS44 [ 11] V.34 Preemphasis Filter SelectionS45 [ 0] Signaling type for use on T1/R2 trunks0 = Null Signaling 4 = Hi Band R2 Signaling1 = MF Signaling 5 = Modified R1 Signaling2 = DTMF Signaling 6 = SS7/COT Signaling3 = Low Band R2 SignalingS46 [ 0] Call progress detection (bit mapped)0 = Disabled 2 = Ringback1 = Dialtone 4 = BusyS47 [ 2] Hayes escape detector0 = Disabled 1 = Enabled2 = Enabled only in Originate modeStrike a key when ready (Q to QUIT)S48 [ 1] AT command processor0 = Disabled 1 = EnabledS49 [ 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 compensation0 = Disabled 1 = EnabledS53 [ 3] V.8bis capability (bit mapped)0 = All V.8bis Options Disabled - (disables K56flex)1 = Enable/Disable V.8bis negotiation2 = Enable/Disable V.90 negotiation in V.8bis3 = Enable V.90 negotiation in V.8bis - (enables K56flex)S54 [ 8] General capability (bit mapped)0 = All general options disabled1 = Reserved for future release2 = Enable Aggressive Client Capping4 = Force 4 point training8 = Enable Power Control16= Enable EC Quality Checking32-32768 = Reserved for Future UseS55 [ 0] Reserved for future useS56 [33600] Maximum V.34 TX bit rate(4800 to 33600 bps, >=Min)0 = Disabled 1 = EnabledS54 [ 0] Host Debug message0 = Disabled 1 = EnabledS55 [ 0] SS7/COT ControlRTcc.cttt.tttt.tttt RT:0=1780,1=2010 Hzccc:0=R-T,1=T-R,2=R,3=T,4=R&T t:10msS54 [ 0] V.8bis Enable0=Disabled, 1=EnabledS55 [ 0] Host Debug MessageS56 [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 bits0 = OriginateSet by Q.931 = AnswerS59 [ 0] Reserved for future useS60 [ 0] Sticky Flags0 = All negotiable features disabled1=UnsTermMsg2=Mica Capabilities MaskS61 [ 0] Reserved for future useOKAmpersand 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
&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
Default
&D3
Table 8 DTR Control Command Options
&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
+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
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
:
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
Default
\Q0
Table 11 Flow Control Command Options (Fax Mode Only)
\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\SCisco MICA Hex Modem Link StatisticsHost interface protocol (IP) RAWData compression protocol V.42bisLine interface protocol (EC) V.42 (LAP-M)Line modulation standard K56Flex 1.1Line transfer rates 46000 bps TX and 28800 bps RXThe modem has been connected 0 days, 0:01:36Last disconnect reason 0x0000Current line quality 3Strike a key when ready (Q to QUIT)Bytes sent to host 518 Bytes received from host 22Bytes received from line 0 Bytes sent to line 17Bytes estimated lost 0 Bytes resent to line 0IP packets received from line 0 IP packets sent to line 0IP packets received errored 0 IP packets aborted 0EC frames received from line 0 EC frames sent to line 8EC average RX frame length 0 EC current TX frame length 128EC NAKs received from line 0 EC NAKs sent to line 0EC frames known lost 0 EC frames retransmitted 0EC retransmission cycles 2 EC timer recovery's 2EC negotiated RX frame length 128 EC negotiated TX frame length 128EC negotiated RX window 15 EC negotiated TX window 15EC negotiated compression dict 2048 EC negotiated compression smax 32Strike a key when ready (Q to QUIT)Tx. / .Rx.Carrier Frequency (Hz) 0 / 1829Symbol rate (baud/sec) 8000 / 3200Trellis code 0 / 16Non-linear encoding Off / OffPrecoding Off / OffConstellation shaping Off / OffPreemphasis index 0 / 6RX level (dBm) -13 / -23TX level reduction (dBm) 0 / 0Strike a key when ready (Q to QUIT)SNR (dB) 36Far-end echo (dBm) -49Round-trip delay (ms) 3Frequency offset (Hz) 0.0Phase roll freq (Hz) 0.0Phase jitter freq (Hz) 0.0Phase jitter level (deg) 0RBS Pattern 0x20Digital Pad (dB) 6.0Digital Pad Compensation OnSS7/COT Status (iWwOBbT) 0x0000Strike a key when ready (Q to QUIT)Line Probe Results:.......................*................................*.................................*.................................*................................*.................................*.................................*.................................*.................................*.................................*.................................*.................................*.................................*.................................*.................................*.................................*................................*................................*................................*................................*................................*...............................*.............................*.........................*..................*Strike a key when ready (Q to QUIT)Line Rate Histogram:OKModem 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
0
Quick retrains
0 Enable quick retrains
1 Disable quick retrains1, 2
Result codes
0 Result codes
2 No result codes
4 No result codes in answer mode3, 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
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
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:
•
•
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
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
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
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.
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
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
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
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
-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
7
Number of times fallback character must be entered
0 Three times
1 Once6 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
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
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.
2.
3.
4.
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
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.
2.
3.
4.
Note
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.
2.
3.
4.
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
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
01
V.34+, V.34
V.32bis, V.32
V.23
V.22bis, V.22
V.21
BELL212
BELL10311
V.34+, V.34
V.32bis, V.32
V.23
V.22bis, V.22
V.21
BELL212
BELL1032
V.32terbo, V.32bis, V.32
V.23
V.22bis, V.22
V.21
BELL212
BELL1033
V.32bis, V.32
V.23
V.22bis, V.22
V.21
BELL212
BELL1034
V.23
V.22bis, V.22
V.21
BELL212
BELL1035
K56Flex 1.1
V.34+, V.34
V.32bis, V.32
V.23
V.22bis, V.22
V.21
BELL212
BELL1036
V.90
K56Flex 1.1
V.34+, V.34
V.32bis, V.32
V.23
V.22bis, V.22
V.21
BELL212
BELL1037
SS7/COT
8
V.110
9
PIAFS
1 For historical reasons, settings 0 and 1 are functionally identical.
Default
9
Note
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
Table 15 S Registers Controlling Data Rates Under Different Modulation Standards
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
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 RFURange
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
Range
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
0
Dial tone
0 Ignore dial tone
1 Detect dial tone1
Ring back
0 Ignore ring back
2 Detect ring back2
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
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
Table 17 S Registers Controlling Data Rates Under Different Modulation Standards
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
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
Note
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
0
V.8bis negotiation
0 Disable V.8bis negotiation
1 Enable V.8bis negotiation1
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
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 messages1
Aggressive client capping
0 Disable aggressive client capping
2 Enable aggressive client capping2
Force 4-point training
0 Do not force 4-point training
4 Force 4-point training3
Power control
0 Disable power control
8 Enable power control4
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
15
Receive frequency
0 1780 Hz
1 2010 Hz14
Transmit frequency
0 1780 Hz
1 2010 Hz13, 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 use10 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
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
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 messages1
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.
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Note
Document Number OL-0376-01
OL-0376-01
