Table Of Contents
AT Command Set and Register Summary for Cisco PVDM2 Digital Modems
Obtaining Documentation, Obtaining Support, and Security Guidelines
DTE/DCE Command-Response Protocol
AT= x - Write to Selected S-Register
AT? - Read Selected S-Register
On - Return to On-Line Data Mode
Qn - Quiet Results Codes Control
Zn - Soft Reset and Restore Profile
&Fn - Restore Factory Configuration (Profile)
&Mn - Asynchronous/Synchronous Mode Selection
&V - Display Current Configuration and Stored Profiles
&V1 - Display Last Connection Statistics
&Xn - Select Synchronous Clock Source
&Yn - Designate a Default Reset Profile
&Zn=x - Store Telephone Number
%En - Enable/Disable Line Quality Monitor and Auto-Retrain or Fallback/Fall Forward
\Vn - Single Line Connect Message Enable
+A8E - Enable/Disable V.8bis (K56flex) Operation
+ISP Command - Select Digital Pass-Through Mode or Analog Modem Connection
+IPT Command - ISDN Protocol Selection
+IPR Command - Async Rate Selection
Example Command Sequence for V.110
+QC - V.92 QuickConnect Enable
+HTL—Modem On-Hold Time-Out Setting
+DS44—V.44 Compression Parameters
+DCS—V.42bis/V.44 Negotiation Enable
%C—Enable/Disable Data Compression Negotiation
Error Detection and Data Compression Commands
%C - Enable/Disable Data Compression
\An - Select Maximum MNP Block Size
-SEC=n - Enable/Disable MNP10-EC
S0 - Number of Rings to Auto-Answer
S3 - Carriage Return Character
S6 - Wait Time for Dial Tone Before Blind Dialing
S7 - Wait Time for Carrier After Dial, for Silence, or for Dial Tone After "W" Dial Modifier
S9 - Carrier Detect Response Time
S10 - Lost Carrier To Hang Up Delay
S12 - Escape Prompt Delay (EPD)
S14 - General Bit Mapped Options Status
S16 - General Bit Mapped Test Options Status
S21 - V.24/General Bit Mapped Options Status
S22 - Speaker/Results Bit Mapped Options Status
S23 - General Bit Mapped Options Status
S27 - Bit Mapped Options Status
S28 - Bit Mapped Options Status
S29 - Flash Dial Modifier Time
S30 - Disconnect Inactivity Timer
S31 - Bit Mapped Options Status
S37 - Desired Line Connection Speed
S38 - Delay Before Forced Hang Up
S39 - Flow Control Bit Mapped Options Status
S40 - General Bit Mapped Options Status
S41 - General Bit Mapped Options Status
S86 - Call Failure Reason Code
S91 - PSTN Transmit Attenuation Level in Analog Modulations
S92 - Fax Transmit Attenuation Level
S200 - Disable K56Plus Protocol
S202 - CSM Bit Mapped Control Register
S220 - Duration of Answer Tone
S221 - Duration of Billing Delay
S222 - General purpose register
S223 - V.90 PCM Transmit level adjustment
Serial Port Speed and Flow Control
Identification of T.30 Options
Procedure Interrupt Negotiation
Service Class 2 Identification and Selection Commands
+FMFR?, Request Manufacturer Identification
+FMDL?, Identify Product Model
+FREV?, Identify Product Revision
Service Class 2 Action Commands
+FET, Transmit Page Punctuation
+FDR, Begin or Continue Phase C Receive Data
+FLPL, Indicate a Document for Polling
+FCON, Facsimile Connection Response
+FDCS:, Report Current Session Capabilities
+FDIS:, Report Remote Station Capabilities
+FCFR, Indicate Confirmation to Receive
+FTSI:, Report the Transmit Station ID
+FCSI:, Report the Called Station ID
+FPTS:, Receive Page Transfer Status
+FET:, Post Page Message Response
+FPTS:, Transmit Page Transfer Status
+FHNG:, Call Termination with Status
+FCIG:, Report the Polled Station ID
+FDTC:, Report the Polled Station Capabilities
+FPOLL, Indicate Polling Request
+FDCC, DCE Capabilities Parameters
+FDIS, Current Sessions Capabilities Parameters
+FDCS, Current Session Results Parameters
+FPHCTO, DTE Phase C Response Time-out
+FAXERR, T.30 Session Error Report
AT Command Set and Register Summary for Cisco PVDM2 Digital Modems
First Published: August 15, 2007Last Updated: December 5, 2007This document describes modem AT commands and S-registers for Cisco PVDM2-xxDM digital modems.
Note
IOS feature support for PVDM2-xxDM digital modems supersedes CSM V12 capabilities. Please refer to the IOS feature set documentation for details of support on specific platforms.
For information about managing modems on Cisco access gateways using Cisco IOS software commands, refer to the software configuration guide for the access server in which the modems are installed.
This document contains the following sections:
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Obtaining Documentation, Obtaining Support, and Security Guidelines
For information on obtaining documentation, obtaining support, providing documentation feedback, security guidelines, and also recommended aliases and general Cisco documents, see the monthly What's New in Cisco Product Documentation, which also lists all new and revised Cisco technical documentation, at:
http://www.cisco.com/en/US/docs/general/whatsnew/whatsnew.html
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. The table below shows how to enter AT command mode from Cisco IOS EXEC mode using reverse Telnet.
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Use these guidelines when you send AT commands to a modem:
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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.•
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The escape code can be enabled and disabled; for instructions, see "S2 - Escape Character," on page 76 .
Command Syntax
DTE/DCE Command-Response Protocol
Communication between the DTE and modem (DCE) follows command-response protocol, i.e., the DTE sends a command to the modem, then waits for a response from the modem.
Command Syntax and Guidelines
DTE Commands
The ISO 646 character set (CCITT T.50 International Alphabet 5, American Standard Code for Information Interchange) is used for the issuance of commands and responses. Only the low-order 7 bits of each character are used for commands or parameters; the high-order bit is ignored. Upper case characters are equivalent to lower case characters.
DTE Command Lines
A command line is a string of characters sent from a DTE to the DCE while the DCE is in a command state. Command lines have a prefix, a body, and a terminator. The prefix consists of the ASCII characters "AT" (41h, 54h) or "at" (61h, 74h). The body is a string of commands restricted to printable ASCII characters (20h - 7Eh). Space characters (ASCII 20h) and control characters other than carriage return <CR> (default value = ASCII 013 = 0Dh, see register S3), backspace <BS> (default value = ASCII 008 = 08h, see register S5), and cancel <cntrl-x> (ASCII 024 = 18h) in the command string are ignored. The default terminator is the <CR> character. Characters that precede the AT prefix are ignored.
AT Command Guidelines
Modem operation is controlled by generic AT commands. These AT commands may be basic AT (i.e., commands preceded by AT, AT&, AT%, AT*, AT\, AT), AT-, or AT#), S-Register (e.g., S6=n) or Fax class 2 (e.g., +FDCS:) commands. The command syntax and operation guidelines governing each of these command categories are described in subsequent sections.
Basic Command Syntax
Characters within the command line are parsed as commands with associated parameter values. The basic commands consist of single ASCII characters, or single characters proceeded by a prefix character, followed by a decimal parameter (e.g., "&D1"). Missing decimal parameters are evaluated as 0.
+ Command Termination
A "+" command must be terminated by the semicolon ";" character (ASCII 3Bh) if in a command string prior to another command, or by the <CR> at the end of the command string.
AT Command Set Summary
Basic AT Commands
V.92 Data Mode Commands
+QC
V.92 QuickConnect Enable
+HEN
Modem On-Hold Enable
+HTL
Modem On-Hold Time-Out Setting
+DS44
V.44 Compression Parameters
+DCS
V.42bis/V.44 Negotiation Enable
%Cn
Enable/Disable Data Compression Negotiation (see ECC Commands)
&V2
V.92 connection statistics
ECC Commands
MNP10EC Commands
-SEC=0
Disable MNP10-EC.
-SEC=1,[<tx level>]
Enable MNP10-EC and set transmit level <tx level> 0 to 30 (0 dBm to -30 dBm).
FAX Class 2 Commands
AT Commands Description
AT Commands
A/ - Re-execute Command
The modem behaves as though the last command line had been re-sent by the DTE. "A/" will repeat all the commands in the command buffer.
The principal application of this command is to place another call (using the Dial command) that failed to connect due to a busy line, no answer, or a wrong number. This command must appear alone on a command line. This command should not be terminated by a carriage return.
AT= x - Write to Selected S-Register
This command writes the value x to the currently selected S-Register. An S-Register can be selected by using the ATSn command. All of the S-Registers will return the OK response if x is a number. Some registers may not be written due to country specific PTT limitations.
AT? - Read Selected S-Register
This command reads and displays the selected S-Register. An S-Register can be selected by using the ATSn command.
A - Answer
The modem will go off-hook and attempt to answer an incoming call if correct conditions are met. Upon successful completion of answer handshake, the modem will go on-line in answer mode. Operation is also dependent upon +FCLASS command and country-specific requirements.
If +FCLASS=0 is selected, the modem will enter the connect state after exchanging carrier with the remote modem. If no carrier is detected within a period specified in register S7, the modem hangs up. Any character entered during the connect sequence will abort the connection attempt.
If +FCLASS= 2 is selected, the modem will go off-hook in V.21 answer mode. It will generate the V.21 2100 Hz answer tone for 3 ± 0.5 seconds and, following a delay of 70 ms, will proceed as if the +FTH=3 command were issued. At any stage up to (but excluding) the +FTH=3 command state, any character will abort the communication. (See the description of the +FTH command for details.)
Bn - CCITT or Bell
When the modem is configured to allow either option, the modem will select Bell or CCITT modulation for a line speed connection of 300 or 1200 bps according to the parameter supplied. Any other line speed will use a CCITT modulation standard. The parameter value, if valid, is written to S27 bit 6.
Dn - Dial
This command directs the modem to go on-line, dial according to the string entered and attempt to establish a connection. If no dial string is supplied, the modem will go on-line and attempt the handshake in originate mode.
Note
If +FCLASS=0 is selected, the modem will behave as a data modem and will attempt to connect to another data modem. The modem will have up to the period of time specified by register S6 or S7 to wait for carrier and complete the handshake. If this time expires before the modem can complete the handshake, the modem will go on-hook with the NO CARRIER response. This command will be aborted in progress upon receipt of any DTE character before completion of the handshake.
If +FCLASS= 2 is selected, the modem will behave as a facsimile modem and attempt to connect to a facsimile machine (or modem) by entering the HDLC V.21 channel 2 receive state (as if +FRH=3 had been issued). This command will be aborted upon receipt of any DTE character if the modem has not finished dialing. In this case, the modem will go on-hook and return to command mode after displaying the NO CARRIER message. If the modem has finished dialing, it proceeds as if the +FRH=3 command has been issued. (Refer to the +FRH command to determine how the modem behaves following this stage.)
Dial Modifiers
The valid dial string parameters are described below. Punctuation characters may be used for clarity, with parentheses, hyphen, and spaces being ignored.
En - Command Echo
The modem enables or disables the echo of characters to the DTE according to the parameter supplied. The parameter value, if valid, is written to S14 bit 1.
Hn - Disconnect (Hang-Up)
This command initiates a hang up sequence.
This command may not be available for some countries due to PTT restrictions.
In - Identification
The modem reports to the DTE the requested result according to the command parameter.
Nn - Automode Enable
This command enables or disables automode detection. The parameter value, if valid, is written to S31 bit 1.
Note
For example:
N1S37=10 updates the +MS command subparameters to reflect +MS=10,1,300,12000
N0S37=10 updates the +MS command subparameters to reflect +MS=10,0,12000,12000
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On - Return to On-Line Data Mode
This command determines how the modem will enter the on-line data mode. If the modem is in the on-line command mode, the enters the on-line data mode with or without a retrain. If the modem is in the off-line command mode (no connection), ERROR is reported.
P - Set Pulse Dial Default
This command is included for compatibility only, and has no effect other than returning a result code.
Result Code: OK
Qn - Quiet Results Codes Control
The command enables or disables the sending of result codes to the DTE according to the parameter supplied. The parameter value, if valid, is written to S14 bit 2.
Q0
Enables result codes to the DTE. (Default)
Q1
Disables result codes to the DTE.
Sn - Select S-Register
The modem selects an S-Register or performs an S-Register read or write function.
n
Establishes S-Register n as the last register accessed.
n=v
Sets S-Register n to the value v.
n?
Reports the value of S-Register n.
The parameter n can be omitted, in which case the last S-Register accessed will be assumed. The S can be omitted for AT= and AT?, in which case the last S-Register accessed will be assumed.
ATS7
establishes S7 as the last accessed register.
AT=40
sets the contents of the last register accessed to 40.
ATS=20
sets the contents of the last register accessed to 20.
If the number "n" is beyond the range of the S-Registers available, the modem will return the ERROR message. The value "v" is "MOD"ed with 256. If the result is outside the range permitted for a given S-Register the values will still be stored, but functionally the lower and higher limits will be observed. Input and output are always in decimal format. Note that some S-Registers are read-only. In these cases, writing to the S-Register will appear to be accepted but the value will not actually be written.
Due to country restrictions, some commands will be accepted, but the value may be limited and replaced by a maximum or minimum value.
T - Set Tone Dial Default
This command is included for compatibility only, and has no effect other than returning a result code.
Result Code: OK
Vn - Result Code Form
This command selects the sending of short-form or long-form result codes to the DTE. The parameter, if valid, is written to S14 bit 3.
V0
Enables short-form (terse) result codes. Line feed is not issued before a short-form result code.
V1
Enables long-form (verbose) result codes. (Default)
Wn - Connect Message Control
This command controls the format of CONNECT messages. The parameter value, if valid, is written to S31 bits 2 and 3. Note that the Wn command can be overridden by register S95 bits (see S95 description).
Xn - Extended Result Codes
This command selects which subset of the result messages will be used by the modem to inform the DTE of the results of commands.
Blind dialing is enabled or disabled by country parameters. If the user wishes to enforce dial tone detection, a "W" can be placed in the dial string (see D command). Note that the information below is based upon the default implementation of the X results table. Table 1 indicates the messages which are enabled for each X value.
If the modem is in facsimile mode (+FCLASS= 2), the only message sent to indicate a connection is CONNECT without a speed indication.
Table 1 Extended Result Codes
Note
Yn - Long Space Disconnect
This command enables/disables the generation and response to long space disconnect. The parameter value, if valid, is written to S21 bit 7.
Zn - Soft Reset and Restore Profile
The modem performs a soft reset and restores (recalls) the default profile. If no parameter is specified, zero is assumed. There is only one default profile and ATZ0 and ATZ1 restores the same default profile.
Z0
Soft reset and restore default profile.
Z1
Soft reset and restore default profile.
AT& Commands
&Cn - RLSD (DCD) Option
The modem controls the RLSD output in accordance with the parameter supplied. The parameter value, if valid, is written to S21 bit 5.
&C0
RLSD remains ON at all times.
&C1
RLSD follows the state of the carrier. (Default)
&Dn - DTR Option
This command interprets the ON to OFF transition of the DTR signal from the DTE in accordance with the parameter supplied. The parameter value, if valid, is written to S21 bits 3 and 4. Also, see S25.
If &Q5, &Q6, +FCLASS=2 is in effect, the action taken is the same as for &Q0.
&Fn - Restore Factory Configuration (Profile)
The modem loads the factory default configuration (profile). The factory defaults are identified for each command and in the S-Register descriptions. A configuration (profile) consists of a subset of S-Registers. There is only one factory configuration and AT&F0 and AT&F1 restore the same factory configuration.
&Gn - Select Guard Tone
The modem generates the guard tone selected by this command according to the parameter supplied (DPSK modulation modes only). The parameter value, if valid, is written to S23 bits 6 and 7.
&G0
Disables guard tone. (Default)
&G1
Disables guard tone.
&G2
Selects 1800 Hz guard tone.
This command may not be permitted in some countries.
&K - Flow Control
This command is included for compatibility only, and has no effect other than returning a result code.
Result Code: OK
&Ln - Leased Line Operation
This command requests leased line or dial-up operation. This command is provided for compatibility only; no mode change is performed, dial-up operation continues. The OK response is returned for a valid parameter, but no other action is performed. The parameter value, if valid, is written to S27 bit 2.
&Mn - Asynchronous/Synchronous Mode Selection
This command determines the DTR operating mode. The modem treats the &M command as a subset of the &Q command.
&Qn - Sync/Async Mode
This command is an extension of the &M command and is used to control the connection modes permitted. It is used in conjunction with S36 and S48. (Also, see \N.)
Note
&Rn - RTS/CTS Option
This selects how the modem controls CTS. CTS operation is modified if hardware flow control is selected (see &K command). The parameter value, if valid, is written to S21 bit 2.
&Sn - DSR Override
This command selects how the modem will control DSR. The parameter value, if valid, is written to S21 bit 6.
&S0
DSR will remain ON at all times. (Default)
&S1
DSR will become active after answer tone has been detected and inactive after the carrier has been lost.
&Tn - Test and Diagnostics
The modem will perform selected test and diagnostic functions according to the parameter supplied. A test can be run only when in an asynchronous operation in non-error-correction mode (normal or direct mode). To terminate a test in progress, the escape sequence must be entered first, except for parameters 7 and 8. If S18 is non-zero, a test will terminate automatically after the time specified by S18 and display the OK message. Note: For tests 3, 6, and 7, a connection between the two modems must first be established.
&V - Display Current Configuration and Stored Profiles
Reports the current (active) configuration, the stored (user) profiles, and the first four stored telephone numbers. The stored profiles and telephone numbers are not displayed if the NVRAM is not installed or is not operational as detected by the NVRAM test during reset processing.
Result Code: OK
Example:AT&VACTIVE PROFILE:B0 E1 L1 M1 N1 QO T V1 W0 X4 Y0 &C0 &D0 &G2 &J0 &K3 &Q5 &R1 &S0 &T4 &X0 &Y0S00:002 S01:000 S02:043 S03:013 S04:010 S05:008 S06:002 S07:030 S08:002 S09:006S10:014 S11:255 S12:050 S18:000 S25:005 S26:001 S36:007 S37:000 S38:020 S46:138S48:007 S95:000&V1 - Display Last Connection Statistics
Displays the last connection statistics in the following format (shown with typical results):
TERMINATION REASON LINK DISCONNECT or LOCAL REQUESTLAST TX data rate 48000 BPSHIGHEST TX data rate 48000 BPSLAST RX data rate 31200 BPSHIGHEST RX data rate 31200 BPSError Correction PROTOCOL LAPMModulation V.90Data COMPRESSION V42BisDigital Pad Detected 000Line QUALITY 000Receive LEVEL 023Highest SPX Receive state 068Highest SPX Transmit state 067Last SPX Receive state 000Last SPX Transmit state V42BisEQM Sum Value 0014RBS Pattern Detected 21Data Rate Dropped in kbps 04Local Retrain Count 00Remote Retrain Count 00Local Rate Reneg Count 00Remote Rate Reneg Count 00Flex 94018302000Connected V.90&V2 - Modem Status Reporting
&V2 reports a string that contains a modem status report.
&V2 responds with a character string organized in the following manner:
BEGINaa26ab26ac26ad26ba11bb11 ... ti0END
where:
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Automatic Reporting
By setting bit 4 of S202 (i.e., S202=16), the modem status string will automatically display before every connect message and after each hang-up (before the `NO CARRIER' message).
Supported &V2 Command Fields
The &V2 Command Fields are described in Table 2. These values are for the US profile; other profiles are not taken into account.
Table 2 &V2 Command Field Description
aa
Current transmit speed
These fields display the data rate codes. These speeds can be decoded using Table 3.
ab
Minimum transmit speed
ac
Maximum transmit speed
ad
Initial transmit speed
ba
Current receive speed
bb
Minimum receive speed
bc
Maximum receive speed
bd
Initial receive speed
ca
Error correction protocol
This field displays the type of error correction chosen. Refer to Table 4.
cb
Data compression type
This field displays the type of compression chosen. Refer to Table 5.
cc
Modulation type
These fields display the modulation type chosen, i.e., the DDP CONF value (see DDP designer's guide).Refer to Table 6.
cd
Initial modulation type
da
Symbol rate
This field is only for V.34, K56flex, and V.90 connections. For all other connections see the data pump manual for symbol rate.
Symbol rates are shown in Table 7.
ea
Transmit carrier frequency
These fields are only for V.34 connections. See Table 8 for a list of frequencies. For all other connections see the data pump manual for the carrier frequency. A one signifies the high frequency and a zero signifies the low frequency. These are dependent on the symbol rate which can be found in field "ea".
eb
Receive carrier frequency
fa
Last AGC gain value
These fields display the decimal value of the AGC gain high byte. This value can be used to calculate the Receive level with the calculations shown in Table 9.
fb
Minimum AGC gain value
fc
Maximum AGC gain value
ga
Transmit level
This field displays the transmit level based on S91. The value given is in negative dBs.
The Transmit Level in -dB can be calculated from the reported value as follows:
Transmit Level in -dB = S91 - (0xA48)
gb
Transmit Level Reduction
This field indicates the transmit level reduction as requested by the remote modem.
ha
Last EQM value
These fields display the values from the last, maximum and minimum EQM readings.
hb
Minimum EQM value
hc
Maximum EQM value
hd
Number of EQM hits
This field will display the number of times EQM values became larger than 7Fh. This condition will cause a rate renegotiation
he
EQM Sum (Low Byte)
These fields contain the EQM Sum. The higher two bytes are used for the speed selection.
hf
EQM Sum (Middle Byte)
hg
EQM Sum (High Byte)
hh
Reserved
These fields are reserved for future use
hj
EQM 1 second before &v2 issued or hangup
These fields contain the last 1 to 10 seconds of EQM accumulated
hk
EQM 2 seconds before &v2 issued or hangup
hl
EQM 3 seconds before &v2 issued or hangup
hm
EQM 4 seconds before &v2 issued or hangup
hn
EQM 5 seconds before &v2 issued or hangup
ho
EQM 6 seconds before &v2 issued or hangup
hp
EQM 7 seconds before &v2 issued or hangup
hq
EQM 8 seconds before &v2 issued or hangup
hr
EQM 9 seconds before &v2 issued or hangup
hs
EQM 10 seconds before &v2 issued or hangup
ia
SNR ratio
These fields display the SNR values obtained during the V.34 probe. The value needs to be converted in the following manner:
SNR in dB = 1.7 (X) - 7, where X is the value displayed
ib
Minimum SNR value
ic
Maximum SNR value
ja
Number of local retrains
These fields display the number of retrains which occurred during the connection.
jb
Number of remote retrains
jc
Number of local rate renegs
These fields display the number of rate renegotiations which occurred during the connection.
jd
Number of remote rate renegs
je
Number of retrains (local and remote) during V.42 negotiation
These fields display the number of local and remote retrains and rate renegs during V.42 negotiation.
jf
Number of rate renegs (local and remote) during V.42 negotiation
jg
Number of overflow that occurs in any message queue
ka
Transmit Non-linear Encoding
These fields display a 1 if non-linear encoding is on and a 0 if non-linear encoding is off.
kb
Receive Non-linear Encoding
kc
Transmit precoding
These fields display a 1if precoding is on and a 0 if precoding is off.
kd
Receive precoding
ke
Transmit shaping
These fields display a 1 if shaping is on and a 0 if shaping is off.
kf
Receive shaping
kg
Trellis mapping
This field displays the code for the type of trellis mapping used. Refer to Table 10.
kh
Pre-emphasis
This field displays the number of the pre-emphasis filter chosen during the call. The value will be between 0 and 10.
ki
Upper band edge
These fields display the upper and lower band edges. The values need to be converted using the following equations:
Lower -3 dB edge (Hz) = 37.5(X) +150
Upper -3 dB edge (Hz) = 37.5(X) + 2400where X is the decimal value displayed.
kj
Lower band edge
kk
Round trip delay high byte
These fields display the values needed to calculate the round trip delay using the following calculation:
RTD =(N/8000) (for V.92 and V.90)
RTD = (N / X) - 3.5 (for V.34, K56flex, and V.FC)
RTD = (N / 2.4) - 29 (for V.32 bis)where:
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Example:
kk32kl127 converts 32 to 20h and 127 to 7Fh to get the 16-bit word 207Fh. Now convert this to it's decimal equivalent (8319) and this is the value of N.
kl
Round trip delay low byte
km
Info 0 Sequence (High byte)
These fields make up the Info 0 sequence. Convert km to hex -this is the high byte of the sequence. When kn is converted to hex this is the low byte of the sequence.
kn
Info 0 Sequence (Low byte)
ko
RX MP sequence byte 1 (Low byte)
These fields make up the RX MP sequence. Convert all to hex in this order kqkrkokp.
kp
RX MP sequence byte 1 (High byte)
kq
RX MP sequence byte 2 (Low byte)
kr
RX MP sequence byte 2 (High byte)
la
Highest transmit state
These fields display the highest transmit and receive SPX states reached. A description of these states can be found in the DDP designer's guide. The values must be changed to hex format
lb
Highest receive state
lc
Last transmit state
These fields display the last transmit and receive SPX states reached. A description of these states can be found in the DDP designer's guide. The values must be changed to hex format.
ld
Last receive state
le
2nd Last transmit state
These fields display the last nth transmit and nth receive spx states reached. A description of these states can be found in the DDP designer's guide. The values must be changed to hex format.
lf
2nd Last receive state
lg
3rd Last transmit state
lh
3rd Last receive state
li
4th Last transmit state
lj
4th Last receive state
lk
5th Last transmit state
ll
5th Last receive state
lm
6th Last transmit state
ln
6th Last receive state
lo
7th Last transmit state
lp
7th Last receive state
lq
8th Last transmit state
lr
8th Last receive state
ls
9th Last transmit state
lt
9th Last receive state
lu
10th Last transmit state
lv
10th Last receive state
lw
11th Last transmit state
lx
11th Last receive state
ly
12th Last transmit state
lz
12th Last receive state
ma
Connection time (Hours)
These fields combine to give the total time of connection
mb
Connection time (Minutes)
mc
Connection time (Seconds)
na
Auto gain amplitude
This field displays the auto gain value chosen for the connection. The amplitude values are shown in Table 11.
nb
Auto gain attenuation
This field displays the auto gain attenuation. The attenuation values are shown in Table 12.
oa
Digital Pad Detected
This field displays the digital pad found during the connection. These fields need to be converted into its hex equivalent.
The digital pad is determined using Table 13.
ob
RBS Pattern
This field displays the total RBS pattern found during the connection.
This field needs to be converted to its hex equivalent and the lower six bits display the pattern. Bits 6 and 7 are not used.
oc
Rate drop due to RBS
This field displays the rate dropped due to RBS (in kbps).
pa
Maximum number of retransmissions for one frame
These fields show statistics on the number of V.42 retransmissions. Frames can also be referred to as Blocks.
pb
Total number of retransmissions during connection
pc
Number of LAPM REJ frames received
pd
Number of LAPM REJ frames transmitted
pe
Number of TX blocks (High byte)
These fields show statistics on the number of V.42 data transfers.
pf
Number of TX blocks (Low byte)
pg
Number of RX blocks (High byte)
ph
Number of RX blocks (Low byte)
pi
Number of TX characters (High byte)
These fields report the number of characters transmitted/received during the connection.
pj
Number of TX characters (2nd byte)
pk
Number of TX characters (3rd byte)
pl
Number of TX characters (Low byte)
pm
Number of RX characters (High byte)
pn
Number of RX characters (2nd byte)
po
Number of RX characters (3rd byte)
pp
Number of RX characters (Low byte)
qa
Disconnect reason
This field displays a code which describes the reason for disconnection. Table 14 shows the disconnect reason codes.
qb
Reason for Retrain or rate renegotiation
This field displays a code to show where the last request for a retrain or rate renegotiation originated from. These codes are given in Table 15.
qc
ABCODE (Abort code)
This field stores the last known ABCODE received from the data pump.
ra
Negotiation Status
This field reports the negotiation status. Refer to Table 16.
rb
V.8bis octet 13
This field displays octet 13 from the V.8bis negotiation. This field represents the manufacturer's ID:
148 = K56flex (generic)
74 = Lucentrc
V.8bis octet 14
This field displays octet 14 from the V.8bis negotiation. This field represents the Licensee code. Refer to Table 17.
rd
V.8bis octet 15
This field displays octet 15 from the V.8bis negotiation. This field represents the manufacturer's product capabilities.
Bit 0: Indicates K56flex capability. (1= K56flex capable, 0= not K56flex capable)
Bits 1-6: Reserved for future use
Bit 7: Indicates if this octet is the last byte. (1= last byte, 0= not last byte)
re
V.8bis octet 16
This field displays octet 16 from the V.8bis negotiation. This field represents the flex version number.
Bits 0-4: Indicate the flex version number
Bit 5: Prototype bit (1=prototype, 0=not prototype)
Bit 6: Indicates whether the remote is a server or client (1=server, 0= client)
Bit 7: Indicates if this octet is the last byte. (1=last byte, 0= not last byte)
rf
V.8bis octet 17
This field displays octet 17 from the V.8bis negotiation. This field represents CONEXANT's data pump revision number.
Bits 0-6: Indicate CONEXANT's data pump revision number
Bit 7: Indicates if this octet is the last byte. (1=last byte, o= not last byte)
Note
rg
V.8bis octet 18
This field displays octet 18 from the V.8bis negotiation. This field represents x-law status and CONEXANT's controller revision.
Bits 0-4: Indicate CONEXANT's controller revision.
Bit 5: Indicates a-law or m-law. (1= A-law, 0 = m-law)
Bit 6: Indicates whether x-law was forced or not. (1=forced, 0= not forced)
Bit 7: Indicates if this octet is the last byte. (1=last byte, 0 = not last byte)
rh
V.8bis progress
Bit 0: Set if received Cre Tone
Bit 1: Set if received CRd Tone
Bit2: Set if received CL message
Bit3: Set if received MS message
Bit4: Set if received ACK message
Bit5: Set if received NAK message
Bit6: Set if V.8bis finish
Bit7: Set if V.8 started
sa
V.90 Minimum Distance (High Byte)
These fields report the high and low bytes of the minimum distance value negotiated in V.90.
sb
V.90 Minimum Distance (Low Byte)
sc
V.90 Digital Pad Value (High Byte)
These fields display the digital pad value negotiated in V.90.
2000h is the approximate value for no pad.
2D6Ah is the approximate value for a 3 dB pad.
3F07h is the approximate value for a 6 dB pad.
The equation for this calculation is:
20*log10(N/2000h)
Where N is the value from the sc and sd fields.
sd
V.90 Digital Pad Value (Low Byte)
ta
Handshake time
This field displays the number of seconds it took to connect:
tb
Number of the handshake retries
This field displays the number times the handshake reached phase three then repeated to phase two before connecting.
tc
EC state 1
Refer to Table 18 for a description of the EC state bits.
td
EC state 2
te
Firmware state
These fields show internal error notification.
tf
Memory address High byte
tg
Memory address Low byte
th
Number of minutes since last retrain or rate reneg
ti
WA status
This field shows the number of minutes since the last retrain or rate reneg.
Table 4 Error Correction Types (&V2 - ca field)
70
NONE
77
LAP-M
80
MNP4
81
MNP10 with cellular
Table 5 Data Compression Types (&V2 - cb field)
69
NONE
66
MNP 5
67
V.42 bis
68
V.44
Table 6 Modulation Types for V.34, K56flex, and V.90 connections (&V2 - cc, cd fields)
224-246
V.90
192-206
V.34
177-184
V.17
161-164
V.23
160 or 168
V.21
144-157
K56flex (K56Plus)1
130-132
V.22 bis
112-120
V.32
98
Bell 212
96
Bell 103
81-82
V.22
64-76
V.FC
49-56
V.33
35
Bell 208
17-20
V.29
1-2
V.27
224-246
V.90
1 Parameter ra can be used to distinguish between K56flex and K56Plus. For example:
1 Parameter cc = 000000E0-000000F6: V.90
1 Parameter cc = 00000090-0000009D and parameter ra bit 5 = 1: K56flex
1 Parameter cc = 00000090-0000009D and parameter ra bit 5 = 0: K56Plus
Table 8 Transmit and Receive Carrier Frequencies (&V2 - ea, eb fields)
2400
1800
1600
2800
1867
1680
3000
2000
1800
3200
1920
1829
3429
1959
1959
Table 9 Receive Level Calculations for AGC Gain (&V2 - fa, fb, fc fields)
V.90, K56flex, V.34, V.33, V.17, V.29, V.27, V.FC
RL = N/2.7 - 52 dB
V.32 bis, V.32
RL = N/2.7 - 53 dB
V.22 bis, V.22, Bell 212, V.23/1200
RL = N/2.7 - 48 dB
V.21, V.23/75
RL = N/2.7 - 54 dB
Bell 103
RL = N/2.7 - 51 dB
1 Where n is the number displayed
Table 10 Trellis Mapping Values (&V2 - kg field)
0
16 state
8
32 state
16 or 24
64 state
Table 17 Licensee Codes (&V2 - rc field)
&Xn - Select Synchronous Clock Source
Selects the source of the transmit clock for the synchronous mode of operation. The parameter value, if valid, is written to S27 bits 4 and 5.
In asynchronous mode, the transmit and receive clocks are turned OFF. In synchronous mode, the clocks are turned ON with the frequency of 1200 Hz or faster corresponding to the speed that is selected for modem operation.
&Yn - Designate a Default Reset Profile
Selects which user profile will be used after a hard reset. There is only one factory default profile and AT&Y0 and AT&Y1 will restore same default profile.
&Y0
The modem will use default profile.
&Y1
The modem will use default profile.
&Zn=x - Store Telephone Number
This command is included for compatibility only, and has no effect other than returning a result code.
Result Code: OK
AT% Commands
%En - Enable/Disable Line Quality Monitor and Auto-Retrain or Fallback/Fall Forward
Controls whether or not the modem will automatically monitor the line quality and request a retrain (%E1) or fall back when line quality is insufficient or fall forward when line quality is sufficient (%E2). The parameter value, if valid, is written to S41 bits 2 and 6.
If enabled, the modem attempts to retrain for a maximum of 30 seconds.
%E0
Disable line quality monitor and auto-retrain.
%E1
Enable line quality monitor and auto-retrain.
%E2
Enable line quality monitor and fallback/fall forward. (Default)
Fallback/Fall Forward:
When %E2 is active, the modem monitors the line quality (EQM). When line quality is insufficient, the modem will initiate a rate renegotiation to a lower speed within current modulation. The modem will keep falling back within the current modulation if necessary until the speed reaches 2400 bps (V.34) or 4800 bps (V.32). Below this rate, the modem will only do retrains if EQM thresholds are exceeded. If the EQM is sufficient for at least one minute, the modem will initiate a rate renegotiation to a higher speed within the current modulation speeds. The rate renegotiations will be done without a retrain if a V.32 bis connection is established.
Speeds attempted during fallback/fall forward are those shown to be available in the rate sequences exchanged during the initial connection. Fallback/fall forward is available in error correction and normal modes, but not in direct mode or synchronous mode with external clocks.
%L - Line Signal Level
Returns a value which indicates the received signal level. The value returned is a direct indication (DAA dependent) of the receive level at the MDP, not at the telephone line connector. For example, 009 = -9 dBm, 043 = -43 dBm, and so on.
Result Code: OK
%Q - Line Signal Quality
Reports the line signal quality. Returns the higher order byte of the EQM value.
An example is as follows.
AT%Q015
OK
If connected.
ERROR
If not connected, or connected in 300 bps, V.23, or fax modes.
AT\ Commands
\Kn - Break Control
Controls the response of the modem to a break received from the DTE or the remote modem or the \B command according to the parameter supplied. The parameter value, if valid, is written to S40 bits 3, 4, and 5.
The response is different in depending on three separate cases.
Case 1
The modem receives a break from the DTE when the modem is operating in data transfer mode:
\K0
Not supported.
\K1
Not supported.
\K2
Not supported.
\K3
Not supported.
\K4
Not supported.
\K5
Send break to remote modem in sequence with transmitted data. (Default)
Case 2
The second case is where the modem is in the on-line command state (waiting for AT commands during a data connection, and the \B is received in order to send a break to the remote modem:
\K0
Not supported.
\K1
Not supported.
\K2
Not supported.
\K3
Not supported.
\K4
Not supported.
\K5
Send break to remote modem in sequence with data. (Default)
Case 3
The third case is where a break is received from a remote modem during a non-error corrected connection:
\K0
Not supported.
\K1
Not supported.
\K2
Not supported.
\K3
Not supported.
\K4
Not supported.
\K5
Send a break in sequence with received data to DTE. (Default)
\Nn - Operating Mode
This command controls the preferred error correcting mode to be negotiated in a subsequent data connection.
\Vn - Single Line Connect Message Enable
The single line connect message format can be enabled or disabled by the \Vn command as follows:
When single line connect messages are enabled, there are no CARRIER, PROTOCOL, or COMPRESSION messages apart from the fields described below.
The single line connect message format is:
CONNECT <DTE Speed></Modulation></Protocol></Compression></Line Speed>/<Voice and Data>
where:
•
•
"V32" for V.32 or V.32bis modulations,
"V34" for V.34 modulations.
Note
•
"ALT" for Microcom Network Protocol,
"LAPM" for LAP-M protocol.•
"V42BIS" for V.42bis compression.
Note
•
–
–
•
AT+ Commands
A "+" command must be terminated by the semicolon ";" character (ASCII 3Bh) if in a command string prior to another command, or by the <CR> at the end of the command string.
+A8E - Enable/Disable V.8bis (K56flex) Operation
This command enables or disables K56flex operation by enabling or disabling V.8bis negotiation.
Syntax
+A8E = 0,0,00,<v8b>,0,0
Defined Values
<v8b>
Number which enables and disables V.8bis (K56flex) negotiation.
0: Disables V.8bis (K56flex) negotiation.
1: Enable V.8bis (K56flex) negotiation. (Default.)
Reporting Current or Selected Values
Reporting Supported Range of Parameter Values
+MS - Select Modulation
This extended-format command selects the modulation, optionally enables or disables automode, and optionally specifies the lowest and highest connection rates using one to four subparameters (client modem) or five subparameters (server modem).
Syntax
+MS = <mod> [,[<automode>][,[<min_RX_rate>][,[<max_RX_rate>][,[<x_law>][,[<min_TX_rate>],
[[<max_TX_rate>]]]]]]]]<CR>
Note
2. Subparameters not entered (enter a comma only or <CR> to skip the last subparameter) remain at their current values.
Defined Values
<mod>
A decimal number which specifies the preferred modulation (automode enabled), or the modulation to use in originating or answering a connection (automode disabled).
<automode>
An optional numeric value which enables or disables automatic modulation negotiation using V.8 bis/V.8 or V.32 bis Annex A.
0: Automode disabled
1: Automode enabled using V.8bis/V.8 or V.32 Annex A (Default)
Note
(<mod> = 69).For further information on automode, see "<automode Command Information" section.
<min_RX_rate>
An optional decimal number which specifies the lowest rate (bps) at which the modem may receive data during a connection.
300 to 33600.
Default is 300.
<max_RX_rate>
An optional decimal number which specifies the highest rate (bps) at which the modem may receive during a connection.
300 to 33600.
Default is 33600.
<x_law>
An optional number which specifies the codec type and is valid for the server modem only. Any value entered for the client modem is ignored.
0 = m-Law
1 = A-Law
Note
<min_TX_rate>
An optional decimal number which specifies the lowest rate (bps) at which the modem may transmit during a connection.
300 to 56000.
Default is 300.
<max_TX_rate>
An optional decimal number which specifies the highest rate (bps) at which the modem may transmit during a connection.
300 to 56000.
Default is 33600.
<mod> Command Information
1 See optional <automode>, <min_RX_rate>, <max_RX_rate> and <max_TX_rate>subparameters.
2 For V.23, originating modes transmit at 75 bps and receive at 1200 bps; answering modes transmit at 1200 bps and receive at 75 bps. The rate is always specified as 1200 bps.
The modem may also automatically switch to another modulation (automode), subject to the following constraints:
•
•
•
<automode Command Information
For <automode> = 0 (automode disabled, i.e., fixed modulation):
•
+MS=10,0,1200,4800 selects V.32 bis 4800 bps fixed rate.
•
+MS=10,0,2400,14400 selects V.32 bis 14400, 12000, 9600, 7200, or 4800 bps.
•
+MS=11,0,16800,16800 selects V.34 16800 bps fixed mode (no comparable S37 command).
+MS=10,0,12000,12000 selects V.32 bis 12000 bps fixed mode (same as N0S37=10).
For <automode> = 1 (automode enabled, i.e., automatically selected speed and modulation):
The modem connects at the highest possible rate in accordance with V.8 bis/V.8, or V.32 bis Annex A if V.8 bis/V.8 is not supported by the remote modem.
•
+MS=10,1,1200,24000 selects automoding down from V.32 bis 14400 bps.
•
+MS=11,1,300,16800 selects automode starting at V.34 16800 bps (no comparable S37 command).
+MS=9,1,300,12000 selects automode starting at V.32 bis 12000 bps (same as N1S37=10).
Reporting Selected Options
Command
+MS?
Response
+MS: <mod>,<automode>,<min_RX_rate>,
<max_RX_rate>,<x_law>,<min_TX_rate>,
<max_TX_rate>Example
+MS: 12,1,300,33600,0,300,56000 (for default values)
Reporting Supported Options
+ISP Command - Select Digital Pass-Through Mode or Analog Modem Connection
The +ISP command selects digital pass-through mode or analog modem connection.
Syntax
Defined Values
The +ISP command operates as following:
+ISP=X X = 0 Digital 64 kbps pass-through modeX = 1 Digital 56 kbps pass-through modeX = 2 Analog modem connection+IPT Command - ISDN Protocol Selection
The +IPT command selects the ISDN protocol.
Syntax
+IPT = X
Defined Values
Note
•
•
•
•
•
+IPR Command - Async Rate Selection
The +IPR command selects the async rate.
Syntax
+IPR = r
Defined Values
r
Selects the async rate
600, 1200, 2400, 4800, 7200, 9600, 12000, 14400, 19200, 24000, 28800, or 38400 bps
Example Command Sequence for V.110
1.
2.
3.
4.
V.110 will be automatically configured. The E1, E2, and E3 bits will be initialized based on Table 5/V.110, and the frames will be generated based on the adaption rates (Table 6a-f/V.110).
Disconnect:
+++ATH for both modems
V92 Data Mode AT Commands
V.92 Data mode is enabled or disabled using AT commands.
New Connect Message
With the addition of V.92 features, the CSM reports different connect messages as follows:
•
•
AT Commands
The AT commands available for V.92 mode are listed below and described in more detail in the subsequent sections. The &V2 Diagnostics available in V.92 mode are also described.
•
•
•
•
•
+QC - V.92 QuickConnect Enable
This command enables or disables the V.92 QuickConnect feature. V.92 QuickConnect allows for a fast V.92 training sequence (about 10 seconds). If enabled, V.92 must also be supported by the client modem for V.92 operation.
Syntax:
+QC = <QCE>,<Level of ANSPCM>;
Defined Values:
Guest
