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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
Error Detection and Data Compression Commands
Service Class 2 Identification and Selection Commands
Service Class 2 Action Commands
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:
Reporting Current or Selected Values:
Reporting Supported Range of Parameter Values:
+HEN - Modem On-Hold Enable
This command enables or disables the Modem On-Hold feature.
Modem On-Hold allows the client modem to accept a Call Waiting call without releasing the current data connection. When the client is finished with the voice call, the modems reconnect and continue where the data connection was interrupted.
Even when disabled, the modem still responds to the remote's MH sequences; the modem just does not allow being put on-hold. When disabled and an MHreq is received, an MHnack is sent in return. The remote then decides to either disconnect (by sending MHclrd) or request a fast reconnect (by sending MHfrr). If the remote decides to disconnect, the server modem logs the disconnect as Remote Call Waiting.
Syntax:
+HEN = <MHE>, <Max MH sessions>;
Defined Values:
Reporting Current or Selected Values:
Reporting Supported Range of Parameter Values:
+HTL—Modem On-Hold Time-Out Setting
This command allows the user to specify the desired maximum time-out for the MH feature.
Modem On-Hold allows the client modem to accept a Call Waiting call without releasing the current data connection. When the client is finished with the voice call, the modems reconnect and continue where the data connection was interrupted.
The +HTL value is transferred to the requesting modem in the MHack. If the remote does not send MHfrr (request for fast reconnect) or MHclrd (request for cleardown) within the specified time, the modem disconnects with a MH Time-Out disconnect reason. When this value is set to 13 (no limit), the Host can disconnect the call by using ATH or by dropping DTR. The server modem records the disconnect with a Local Request While On-Hold reason.
Syntax:
+HTL= <T1>;
Defined Values:
Reporting Current or Selected Values:
Reporting Supported Range of Parameter Values:
+DS44—V.44 Compression Parameters
This command is used to adjust the parameters for V.44 compression. V.44 is a feature that allows higher compression rates with certain file types. This compression is optimized for internet traffic.
For more information, refer to ITU-T V.44.
Syntax:
+DS44 = <dir>, <comp neg>, <max code tx>, <max code rx>, <max string tx>, <max string rx>,
<max hist tx>, <max hist rx>Defined Values:
Default values: +DS44: 3, 0, 2048, 2048, 140, 140, 10240, 10240
Reporting Current or Selected Values
Reporting Supported Range of Parameter Values
+DCS—V.42bis/V.44 Negotiation Enable
This command enables and disables V.42bis and V.44 data compression negotiation. Also, see the %Cn command.
V.44 is a feature that allows higher compression rates with certain file types. This compression is optimized for Internet traffic. For more information, see ITU-T V.44.
Syntax
+DCS = <V.42bis enable>, <V.44 enable>
Defined Values
Note
2. Except as described in Note 1, the +DCS or %Cn command, whichever was received last, selects the data compression negotiation method.
Reporting Current or Selected Values
Reporting Supported Range of Parameter Values
Command
+DCS=?
Response
+DCS: (range of V.42bis enable), (range of V.44 enable)
Example
+DCS: (0,1), (0,1)
%C—Enable/Disable Data Compression Negotiation
This command is used to enable or disable data compression negotiation. The modem can only perform data compression on an error corrected link. The parameter value, if valid, is reflected in S41 bits 0 and 1. See also the +DCS command.
Commands:
%Cn: Refer to the Error Detection and Data Compression Commands section for details.
V.92 Specific Diagnostics
V.92 specific diagnostics information available during a V.92 connection as reported by the &V2 AT command are listed in Table 19.
Table 19 &V2 Statistics Information for V.92 Connections
se
Remote V.92 Capability
0
Indicates whether or not the remote modem indicated V.92 capability during the INFO0 sequence.
0 = V.92 not supported
1 = V.92 supported
QuickConnect Attempted
1
Indicates whether QuickConnect was attempted.
0 = QC not attempted
1 = QC attempted
V.92 Fallback to V.90
2
Indicates if the modem tried a V.92 QuickConnect and fell back to a V.90 connection.
0 = Fallback to V.90 from V.92 QuickConnect did not occur
1 = Fallback to V.90 from V.92 QuickConnect occurred
QuickConnect Connected
3
Indicates whether the call actually connected with QuickConnect
0 = QC not connected
1 = QC connected
Short Phase 2 Request from Remote
5
Indicates if the remote modem requested a short Phase 2
0 = Remote modem did not request a short Phase 2
1 = Remote modem requested a short phase 2
ANSPCM Levels
6-7
See Table 20.
sf
UQTS and QC Identifiers
Reports parameter values transferred during V.92 QuickConnect
sg
Number of MH Sessions Requested
Reports the number of Modem On-Hold sessions requested by the remote modem.
sh
Number of MH Sessions Granted
Reports the number of Modem On-Hold sessions granted.
si
MH State
0
Indicates whether the modem is currently On-Hold.
0 = Not On-Hold
1 = On-Hold
MH FRR
1
Indicates whether the modem is currently in FRR (Fast Reconnect from MH)
0 = Not in FRR
1 = In FRR
MH Limit
2
Indicates whether the modem has reached its Modem On-Hold Limit.
0 = Limit not reached
1 = On-Hold limit reached
DIL Transmission
3
Indicates if the DIL was sent
0 = DIL was not sent
1 = DIL was sent
qa
V.92 Disconnect Reasons
Reports the reason for the last disconnect.
0x1A = Remote Call Waiting
0x1B = Modem On-Hold Time-out
0x1C = Local Request while Modem On-Hold
0x1D = Local Request while FRR
qb
V.92 Retrain Reason
Reports the reason for the last retrain.
0x11 = Modem was On-Hold
0x12 = Modem was in FRR
0x13 = Modem has sent a MH message
Table 20 V.92 ANSPCM Levels (&V2 - se)
The Host may have to monitor the MH status so that connection status can be reported correctly. For example, the upper layer statistics should record a disconnection due to Call Waiting as a normal disconnection.
Error Detection and Data Compression Commands
AT% Commands
%C - Enable/Disable Data Compression
Enables or disables data compression negotiation. The modem can only perform data compression on an error corrected link. The parameter value, if valid, is reflected in S41 bits 0 and 1.
Note
•
AT\ Commands
\An - Select Maximum MNP Block Size
The modem will operate an MNP error corrected link using a maximum block size controlled by the parameter supplied. The parameter value, if valid, is written to S40 bits 6 and 7.
\A0
64 characters
\A1
128 characters (default)
\A2
192 characters
\A3
256 characters
MNP 10EC Commands
AT-SEC Commands
-SEC=n - Enable/Disable MNP10-EC
Enables or disables MNP10-EC operation.
Syntax
-SEC=n,[<tx level>]
Defined Values:
Example:
AT-SEC=1,18 enables MNP10-EC and sets the transmit level to -18 dBm.
Note
InquiriesAT-SEC? retrieves the current -SEC command settings, e.g., 1,18.
AT Command Result Codes
The modem responds to commands from the DTE and to activity on the line by signaling to the DTE in the form of result codes. The result codes that the modem can send are described in Table 21.
Two forms of each result code are available: long-form, an English-like "verbose" response, and short-form, a data-like numeric response (included in parentheses following the long-form). The long-form code is preceded and terminated by the sequence < CR> < LF>. The short-form is terminated by < CR>, only with no preceding sequence.
If result messages are suppressed, nothing is returned to the DTE. The long-form results codes can be modified by the OEM through the ConfigurACE Configuration Utility Program. (See ConfigurACE description.)
S Registers
S Register Summary
The S-Registers are summarized in this section along with their default values. Registers or register fields quoted as "reserved" are reserved for current or future use by the firmware, or are permanently overridden by PTT limitations.
The factory default values may be loaded at any time by entering the &Fn command.
Table 22 provides a summary of the S-Registers. The S Register Definitions section describes each register in more detail.
S Register Definitions
S0 - Number of Rings to Auto-Answer
Sets the number of the rings required before the modem automatically answers a call. Setting this register to zero disables auto-answer mode.
Range
0-255 rings
Default
0
S1 - Ring Counter
S1 is incremented each time the modem detects a ring signal on the telephone line. S1 is cleared if no rings occur over an eight second interval.
Range
0-255 rings
Default
0
S2 - Escape Character
S2 holds the decimal value of the ASCII character used as the escape character. The default value corresponds to an ASCII '+'. A value over 127 disables the escape process, i.e., no escape character will be recognized.
Range
0-255, ASCII decimal
Default
43 (+)
S3 - Carriage Return Character
Sets the command line and result code terminator character. Pertains to asynchronous operation only.
Range
0-127, ASCII decimal
Default
13 (Carriage Return)
S4 - Line Feed Character
Sets the character recognized as a line feed. Pertains to asynchronous operation only. The Line Feed control character is output after the Carriage Return control character if verbose result codes are used.
Range
0-127, ASCII decimal
Default
10 (Line Feed)
S5 - Backspace Character
Sets the character recognized as a backspace. Pertains to asynchronous operation only. The modem will not recognize the Backspace character if it is set to a value that is greater than 32 ASCII. This character can be used to edit a command line. When the echo command is enabled, the modem echoes back to the local DTE the Backspace character, an ASCII space character and a second Backspace character; this means a total of three characters are transmitted each time the modem processes the Backspace character.
Range
0-32, ASCII decimal
Default
8 (Backspace)
S6 - Wait Time for Dial Tone Before Blind Dialing
Sets the length of time, in seconds, that the modem will wait before starting to dial after going off-hook when blind dialing. This operation, however, may be affected by some ATX options according to country restrictions. The "Wait for Dial Tone" call progress feature (W dial modifier in the dial string) will override the value in register S6.
The modem always pauses for a minimum of 2 seconds, even if the value of S6 is less than 2 seconds.
Range
2-255 seconds
Default
2
S7 - Wait Time for Carrier After Dial, for Silence, or for Dial Tone After "W" Dial Modifier
1.
2.
3.
Range
1-255 seconds
Default
50
S8 - Reserved
S9 - Carrier Detect Response Time
Sets the length of time, in tenths of a second, that the carrier must be present before the modem considers it valid and turns on RLSD. As this time is increased, there is less chance to detect a false carrier due to noise from the telephone line.
Range
1-255 tenths of a second
Default
6 (0.6 second)
S10 - Lost Carrier To Hang Up Delay
Sets the length of time, in tenths of a second, that the modem waits before hanging up after a loss of carrier. This allows for a temporary carrier loss without causing the local modem to disconnect. When register S10 is set to 255, the modem functions as if a carrier is always present.
The actual interval the modem waits before disconnecting is the value in register S10 minus the value in register S9. Therefore, the S10 value must be greater than the S9 value or else the modem disconnects before it recognizes the carrier.
Range
1-255 tenths of a second
Default
14 (1.4 seconds)
S11 - DTMF Tone Duration
Returns OK. The default value is set to 95D. This register is reserved.
S12 - Escape Prompt Delay (EPD)
Returns OK.
Range
0-255
Default
50D
S13 - Reserved
S14 - General Bit Mapped Options Status
Indicates the status of command options.
Default
138 (8A hex) (10001010 binary)
S15 - Reserved
S16 - General Bit Mapped Test Options Status
Indicates the test in progress status.
Default
0
S17 - Reserved
S18 - Test Timer
Sets the length of time, in seconds, that the modem conducts a test (commanded by &Tn) before returning to the command mode. If this register value is zero, the test will not automatically terminate; the test must be terminated from the command mode by issuing an &T0 or H command. When S18 is non-zero, the modem returns the OK message upon test termination.
Range
0-255 seconds
Default
0
S19 - Reserved
S20 - Reserved
S21 - V.24/General Bit Mapped Options Status
Indicates the status of command options.
Default
52 (34h) (00110100b)
S22 - Speaker/Results Bit Mapped Options Status
Indicates the status of command options.
0-1
Speaker volume (Ln)
Not supported
2-3
Speaker control (Mn)
Not supported
4-6
Limit result codes (Xn)
Not supported
7
Reserved
Default
119 (77h) (01110111b)
S23 - General Bit Mapped Options Status
Indicates the status of command options.
0
Grant RDL
0: RDL not allowed (&T5) (Deafault)
1: RDL allowed (&T4)
1-5
Reserved
6-7
Guard tone (&Gn)
0: None (G0) (Default)
1: None (&G1)
2: 1800 Hz (&G2)
Default
54 (36h) (00111110b)
S24 - Sleep Inactivity Timer
Sets the length of time, in seconds, that the modem will operate in normal mode with no detected telephone line or DTE line activity before entering low-power sleep mode. The timer is reset upon any DTE line or telephone line activity. If the S24 value is zero, neither DTE line nor telephone inactivity will cause the modem to enter the sleep mode.
Range
0-255 seconds
Default
0
S25 - Delay To DTR
Sets the length of time that the modem will ignore DTR for taking the action specified by &Dn. Its units are seconds for synchronous modes and one hundredths of a second for other modes.
Range
0-255 (1 second for synchronous modes 1; 0.01 second otherwise)
Default
5
S26 - RTS to CTS Delay
Sets the time delay, in hundredths of a second, before the modem turns CTS ON after detecting an OFF-to-ON transition on RTS when &R0 is commanded. Pertains to synchronous operation only.
Range
0-255 hundredths of a second
Default
1
S27 - Bit Mapped Options Status
Indicates the status of command options.
0, 1, 3
Synchronous/asynchronous selection (&Mn/&Qn)
See Sync/Async Bit Table.
2
Leased line control (&Ln)
0: Dial up line (&L0) (Default)
4-5
Internal clock set (Xn)
0:
1:
2:
6
CCITT/Bell mode select (Bn)
0: CCITT mode (B0)
1: Bell mode (B1) (Default)
7
Reserved
Table 23 Sync/Async Bit Table
0
0
0
&M0 or &Q0
0
0
1
&M1 or &Q1
0
1
0
&M2 or &Q2
0
1
1
&M3 or &Q3
1
0
0
&Q4
1
0
1
&Q5 (Default)&Q6
1
1
0
Default
73 (49h) (01001001b)
S28 - Bit Mapped Options Status
Default
0
S29 - Flash Dial Modifier Time
Sets the length of time, in units of 10 ms, that the modem will go on-hook when it encounters the flash (!) dial modifier in the dial string. The time can be limited as it is a country dependent parameter.
Range
0-255 10 ms intervals
Default
0 (0 ms)
S30 - Disconnect Inactivity Timer
Sets the length of time, in tens of seconds, that the modem will stay online before disconnecting when no data is sent or received. In error-correction mode, any data transmitted or received will reset the timer. In other modes, any data transmitted will reset the timer. The timer is inoperative in synchronous mode.
Range
0-255 tens of seconds (0-2550 seconds)
Default
0 (disabled)
S31 - Bit Mapped Options Status
Default
06 (06h) (00000110b)
S32 - XON Character
Sets the value of the XON character.
Range
0-255, ASCII decimal
Default
17 (11h)
S33 - XOFF Character
Sets the value of the XOFF character.
Range
0-255, ASCII decimal
Default
19 (13h)
S34 - V.44 compression
0 - disable
1 - Enable (default)
S35 - Reserved
S36 - LAPM Failure Control
Default
7 (00000111b)
S37 - Desired Line Connection Speed
This register specifies the desired line connection speed.
Default
0
Note
–
–
•
•
S38 - Delay Before Forced Hang Up
This register specifies the delay between the modem's receipt of the H command to disconnect (or ON-to-OFF transition of DTR if the modem is programmed to follow the signal), and the disconnect operation. Applicable to error-correction connection only. This register can be used to ensure that data in the modem buffer is sent before the modem disconnects.
Range
0-255 seconds
Default
20
Note
•
S39 - Flow Control Bit Mapped Options Status
0-2
Status of command options
0: No flow control
3: RTS/CTS (&K3) (Default)
4: XON/XOFF (&K4)
5: Transparent XON (&K5)
6: Both methods (&K6)
3-7
Reserved
Default
3 (00000011b)
S40 - General Bit Mapped Options Status
Indicates the status of command options.
Default
88 (58h) (01011000b)
S41 - General Bit Mapped Options Status
Indicates the status of command options.
Default
139 (8Bh) (10001011b)
S48 - V.42 Negotiation Action
The V.42 negotiation process determines the capabilities of the remote modem. However, when the capabilities of the remote modem are known and negotiation is unnecessary, this process can be bypassed if so desired.
Range
0, 7, or 128 If an invalid number is entered, it is accepted into the S-Register, but S48 will act as if 128 has been entered.
Default
7
S82 - Break Handling Options
S82 is for compatibility purposes only, changing this register will not have any affect.
S86 - Call Failure Reason Code
When the modem issues a NO CARRIER result code, a value is written to this S-Register to help determine the reason for the failed connection. S86 records the first event that contributes to a NO CARRIER message. The cause codes are:
Range
0-23
Default
21
S91 - PSTN Transmit Attenuation Level in Analog Modulations
Sets the transmit attenuation level from 0 to 20 dBm in analog modulations (e.g., V.34, V.32 bis, V.22 bis, and tone modes) resulting in a transmit level from 0 to -20 dBm.
Range:
0 to 20 (0 to -20 dBm transmit level)
Default
10 (-10 dBm transmit level)
S92 - Fax Transmit Attenuation Level
Sets the transmit attenuation level from 10 to 15 dBm for the fax mode, resulting in a transmit level from -10 to -15 dBm.
Range
10 to 15 (-10 to -15 dBm transmit level)
Default
10 (-10 dBm transmit level)
S95 - Extended Result Codes
The bits in this register can be set to override some of the Wn command options. A bit set to a 1 in this register will enable the corresponding result code regardless of the Wn setting. Also, refer to Table 1.
0
CONNECT result code indicates DCE speed instead of DTE speed.
1
Append/ARQ to CONNECT XXXX result code in error-correction mode (XXXX = rate; see Table 1).
2
Enable CARRIER XXXX result code (XXXX = rate; see Table 1.
3
Enable PROTOCOL XXXX result code (XXXX = protocol identifier; see Table 1).
4
Reserved
5
Enable COMPRESSION result code (XXXX = compression type; see Table 1).
6
Reserved
7
Reserved
Default
0
S200 - Disable K56Plus Protocol
Enables/disables K56Plus protocol.
0-4
Reserved
5
Disable K56Plus
0: Enable K56Plus
1: Disable K56Plus (Default)
6-7
Reserved
Default
4
S202 - CSM Bit Mapped Control Register
Controls K56flex/V90 Tx level and automatic modem status response.
Default
2
S210 - Symbol Rate Limit
Limits the symbol rate for V.34.
Default
13 (0Dh)
S220 - Duration of Answer Tone
Modifies the duration of the answer tone.
Command is in units of 450 ms.
•
•
For +MS=11, +MS=12, or +MS=56 (even if automoding to a lower modulation):
For +MS = anything other than 11, 12, or 56
Default
11
S221 - Duration of Billing Delay
Modifies the duration of the billing delay.
Range
0-255 in 10 ms increments
Default
50 (500 ms)
S222 - General purpose register
Range
0-255.
Default value
0
S223 - V.90 PCM Transmit level adjustment
V.90 transmit level can be varied from 0dbm to -16dbm. The allowed value range is 0 to 31.
DCE will output an Error, if input decimal value is greater than 31. Bit 6 of S202 must be zero for S223 to have any effect. If bit 6 of S202 is one, the TX level is restricted to -6dbm only and S223 will not have any effect on V.90 transmit level.
Formula to convert dBm to S223 value is "dBm = -(S223+1)/2". For example -12dBm = -(23+1)/2. S223 =23 is the default value after power up.
Default
-12db
S224 - Digital detect timer
This register is used to autodetect the incoming call from ISDN V110/V120 (UI and Multiframe) or analog modem.
Values
100ms per unit
Range
0-100
Default
0. The default mode disables ISDN autodetect mode.
FAX Class 2 Commands
This section describes the fax class 2 commands. These commands are summarized in Table 24.
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.
For Phase C data transmission or reception, all 8 bits are needed.
DTE Command Lines
A command line is a string of characters sent from a DTE to the modem (DCE) while the modem is in a command state. A command line has a prefix, a body, and a terminator. Each command line (with the exception of the A/ command) must begin with the character sequence AT and must be terminated by a carriage return. Commands entered in upper case or lower case are accepted, but both the A and T must be of the same case, i.e., "AT" = ASCII 065, 084 or "at" = ASCII 097, 116. The body is a string of commands restricted to printable ASCII characters (032 - 126). Space characters (ASCII 032) and control characters other than CR (ASCII 013) and BS (ASCII 010) in the command string are ignored. The default terminator is the ASCII <CR> character. Characters that precede the AT prefix are ignored. The command line interpretation begins upon receipt of the carriage return character.
Facsimile Command Syntax
After the "AT" or "at" prefix, facsimile commands use extended syntax. Each command is preceded by the "+F" character and consists of single characters and a decimal parameter (if applicable) terminated by the semicolon ":" character (ASCII 059) or by the <CR> that terminated the command line. A missing decimal parameter is evaluated as 0.
For example, the command to instruct the modem to automatically answer a data or fax call and also enable reception is:
AT+FAE=0; +FCR 1 <CR>Basic data mode and fax service class mode select commands are:
AT+FCLASS=0 <CR> for Data ModeAT+FCLASS=2 <CR> for Service Class 2 FaxIn Class 2, the DCE makes and terminates calls, manages the communication session and negotiates (T.30 protocol) and transports the image date to DTE. The T.4 protocol management of image data, etc., is done by DTE.
The response to
AT+FCLASS= 0<CR> in Data Modeor
AT+FCLASS=2<CR> in Service Class 2 Faxis
OKThe service class may be set by the DTE from the choices available using the "+FCLASS=<VALUE>" command.
General Rules
•
•
•
•
•
–
–
–
Serial Port Speed and Flow Control
During fax mode, the DTE-DCE port speed is 19200 bps.
The DCE provides a speed buffer of 1024 bytes and provides the DC1/DC3 (XON/XOFF) or RTS/CTS method of controlling the data into the buffer. This flow control is controlled by the &K3 or &K4 command.
This method of data flow control is available only for DTE to DCE direction of data. There is no provision for data flow control from DCE to DTE.
Data Stream Termination
The DCE exchanges streams of data with the DTE while executing data transfer commands. These data streams use the termination described in Section "AT Commands Description," on page 11.
The ASCII <DLE> character (016) is used as a special character to shield special characters. The <DLE><ETX> character pair (<106><003>) is used to mark the end of a stream. The following patterns are used:
any data...<DLE><ETX>
End of stream
any data...<DLE><DLE>
Single <DLE> in data
any data...<DLE><any byte>
Delete <DLE><any byte>
DTE to DCE Streams
The DCE filters the data stream from the DTE, and removes all character pairs beginning with <DLE>. The DCE recognizes <DLE><ETX> as the stream terminator. The DCE recognizes <DLE><DLE> and reinserts a single <DLE> in its place.
The DTE must filter stream data to the DCE, and insert extra <DLE> characters ahead of data.
DCE to DTE Streams
The DTE must filter the data stream from the DCE, and remove all character pairs beginning with <DLE>. The DTE must recognize <DLE><ETX> as the stream terminator. The DTE must recognize <DLE><DLE> and reinsert a single <DLE> in its place.
The DCE filters stream data to the DTE, and inserts extra <DLE> characters ahead of data.
Auto Answer
The DCE can answer as a data DCE or as a fax DCE. It can answer the call adaptively, in that it can determine whether the call is 'data' or 'fax'. The +FAA parameter controls this feature. Fax adaptive answer operates only when +FCLASS=0.
CONNECT XXXX
DCE status response if data call
+FCON
DCE status response if fax call
Identification of T.30 Options
Group 3 devices negotiate session subparameters in DIS, DCS, and DTC frames. These subparameters are defined in Table 25.
Session Status Reporting
The DCE provides reports to the DTE on the status of a session. The DCE provides the following status reports:
1.
a.
b.
2.
Syntax: +FDIS: VR, BR, WD, LN, DF, EC, BF, ST
3.
4.
a.
b.
c.
5.
a.
Procedure Interrupt Negotiation
CCITT allows a station to request a procedure interruption at the end of a page. This request is passed between stations by the PIP, PIN, and PRI-Q messages.
Service Class 2 Identification and Selection Commands
Three commands (+FMFR?, +FMDL?, +FREV?) report identification and selection information. Each of these three commands cause the DCE to send a message to the DTE. The messages are programmable using ConfigurACE.
+FMFR?, Request Manufacturer Identification
The +FMFR? command causes the DCE to send a message identifying the DCE product manufacturer. The default message is:
ROCKWELL OK+FMDL?, Identify Product Model
The +FMDL? command causes the DCE to send a message identifying the DCE product model. The default message is similar to:
RC96XXXAC OK+FREV?, Identify Product Revision
The +FREV? command causes the DCE to send a message identifying the DCE product model revision number. The message format is the same as the ATI3 message, e.g.:
VX.XXX-model number OKService Class 2 Action Commands
These commands transfer data, and punctuate sessions. They also release specific T.30 messages. All action commands must be the last command on a command line as indicated by the terminating <CR>.
All action commands initiate processes. The modem will not accept other commands from the DTE until the modem issues a final result code (e.g., OK, CONNECT). The modem will abort the process if it receives any character before the final result code is issued.
ATD, Originate a Call
The DCE can support a DTE command to originate a call using the ATD command (see the "AT Commands Description" section).
Syntax
ATD....<CR>
If this command is unsuccessful, the DCE reports an appropriate failure or error type result code such as NO CARRIER, NO DIALTONE, or BUSY (see the "Error Detection and Data Compression Commands" section).
If this call is successful, the typical DCE response is:
•
•
•
•
•
The DCE dials, detects call progress, and generates the CNG tone. It then waits for a DIS frame. On detection of the first Phase B preamble (V.21 ch. 2 modulated by 300 bps HDLC flags), it reports the "+FCON" message to the DTE. The DCE then switches to 19200 bps.
The DCE generates a DCS frame based on the received DIS frame and on the previously set +FDIS parameter. A +FDT command from the DTE releases the DCE to transmit that DCS frame.
The DCE reports the initial received T.30 negotiation messages, including the DIS frame and the optional CSI ID string. The +FDIS: report is followed by the OK final result code.
ATA, Answer a Call
The DCE can support a DTE command to answer an incoming call using the ATA command (see the "AT Commands Description" section).
The DTE may issue an Answer command in response to an incoming ring.
If the Answer command is unsuccessful, the DCE will report an appropriate failure or error type result code, such as NO CARRIER (see the "Error Detection and Data Compression Commands" section).
Manual Call Answer
If this call is successful, the typical DCE response (answer and receive) is:
•
•
•
•
Upon receipt of an Answer command from the DTE, the DCE answers and generates the CED tone. The DCE then generates a DIS frame (derived from the +FDIS parameter) and hunts for the first T.30 negotiation frames. Upon detection of the first Phase B preamble (V.21 ch 2 modulated by 300 bps HDLC flags), it reports the "+FCON" message to the DTE.
The DTE should report the initial received T.30 negotiation messages, including the DCS frame. The +FDCS: report will be followed by the OK final result code.
Automatic Answer
The modem provides for automatic answering of incoming calls. If configured for automatic answer, the modem answers an incoming call in compliance with T.30, and reports the same messages as described for manual answer.
Connection as a Data Modem
If configured to do so by the +FAA parameter, the DCE will adaptively answer as a facsimile DCE or as a data DCE. If the DCE answers as a data DCE, it resets the +FCLASS parameter to 0 and issues the appropriate final result code (e.g., CONNECT, or NO CARRIER) to the DTE.
+FDT, Data Transmission
The +FDT command prefixes Phase C data transmission. When the DCE is ready to accept Phase C data, it issues the negotiation responses and the CONNECT result code to the DTE.
Syntax
+FDT <CR>
In Phase B, the +FDT command releases the DCE to proceed with negotiation, and releases the DCS message to the remote station. In Phase C, the +FDT command resumes transmission after the end of a prior transmit data stream.
Initiate Page Transmission
Phase B DCE polled response:
•
•
•
•
•
After placing a call, or after finishing a document exchange, the DTE may command the DCE to re-enter T.30 Phase B to attempt to negotiate a document transmission.
Continue a Page
The DTE may issue more than one +FDT command for a given page, so that different files may be concatenated together. These files must have the same format.
•
•
Phase C Data Framing
Phase C data must be presented to the DCE in stream mode. The DCE expects Phase C data to follow until it detects <DLE><ETX> termination characters. The DCE will filter the stream as described in the "Serial Port Speed and Flow Control" section.
The DCE will acknowledge the end of the data by returning the OK result code to the DTE.
If there is data underrun before the next +FDT or +FET= command, the DCE will zero-fill the pad as per T.4 until the Phase C timeout (+FPHCTO) is reached, or until more data is received. The DCE appends an RTC pattern to the transmit data after an +FET= command is received from the DTE.
Phase C Data Format
The Phase C data will be of the format specified by the negotiated T.30 DCS frame. The +FDCS:<string> response is defined in the "+FDCS:, Report Current Session Capabilities" section. The subparameter values are described in Table 25.
The DCE will use the negotiated minimum Scan Time parameter from the DCS frame, and insert sufficient fill bits to pad each line to the minimum scan time. This is reported in the +FDCS:ST subparameter.
If the DCE finds more than one consecutive EOL in Phase C data (e.g., RTC), it will send only one EOL.
•
•
•
Table 25 T.30 Session Subparameter Codes
VR
Vertical Resolution
0
Normal, 98 lpi
1
Fine, 196 lpi
BR
Bit Rate1
+FDCS (originate)
+FDIS (answer)
0
2400 bps/V.27 ter
V.27 ter (2400 only)
1
4800 bps/V.27 ter
V.27 ter
2
7200 bps/V.29
V.29, V.27 ter
3
9600 bps /V.29 or V.17
V.29, V.27 ter
4
12000 bps/V.33 or V.17
V.17, V.33, V.29, V.27 ter
5
14400 bps/V.33 or V.17
V.17, V.33, V.29, V.27 ter
WD
Page Width
0
1728 pixels in 215 mm
1
2048 pixels in 255 mm
2
2432 pixels in 303 mm
32
1216 pixels in 151 mm
4 2
864 pixels in 107 mm
LN
Page Length
0
A4, 297 mm
1
B4, 364 mm
2
unlimited length
DF
Data Compression Format
0
1-D modified Huffman
1 2
2-D modified Read
2 2
2-D uncompressed mode
3 2
2-D modified modified Read
EC
Error Correction
0
Disable ECM
(Annex A/T.30)
1 2
Enable ECM, 64 bytes/frame
2 2
Enable ECM, 256 bytes/frame
BF
Binary File Transfer
0
Disable BFT
1 2
Enable BFT
ST
Scan Time/Line
VR = normal
VR = fine
0
0 ms
0 ms
1
5 ms
5 ms
2
10 ms
5 ms
3
10 ms
10 ms
4
20 ms
10 ms
5
20 ms
20 ms
6
40 ms
20 ms
7
40 ms
40 ms
1 CCITT T.30 does not provide for the answering station to specify all speeds exactly using the DIS frame. Implementation of some BR codes (e.g., code 2) by an answering DCE is manufacturer specific.
2 Not supported.
<CAN>, Escape from Transmission
The DCE may request the DTE to halt Phase C transmission, by sending a cancel <CAN> character (024) to the DTE. In this case, the DTE should terminate Phase C transmission, issue <CAN>, and wait for the OK response code from the DCE.
+FET, Transmit Page Punctuation
This command is used to punctuate page and document transmission after one or more +FDT commands. This command generates T.30 Post Page Messages selected by the <ppm> code ( Table 26).
Syntax
+FET=<ppm>[,<pc>,<bc>,<fc>]
DCE response
+FPTS:<ppr> - when received from remote OK
The +FET=<ppm> command indicates that the current page is complete; no more data will be appended to it. The value indicates whether there are any additional pages are to be sent and, if so, whether there is a change in any of the document parameters.
The DTE can command the DCE to generate PRI-Q messages with the +FET=<ppm> command using ppm codes 4-6 ( Table 26).
This command must be sent within the time out specified by +FPHCTO after sending Phase C data, or else the DCE will end the page and document transmission. If the Phase C timeout is reached, the DCE sends an EOP post page message and terminates the session.
The remote facsimile station should respond to the post page message with a post page response. The DCE will report this using the +FPTS:<ppr> response ( Table 27).
End a Page
The +FET= command causes the DCE to append an RTC (6 EOL) pattern as needed and enter Phase D by sending the selected T.30 Post Page message.
The +FET=1 (EOM) command signals the remote station that the next document will have a new DCS negotiated; this causes the session to re-enter Phase B.
+FDR, Begin or Continue Phase C Receive Data
The +FDR command initiates transition to Phase C data reception. This can occur after answering, dialing, a document is received, or a page is received.
Syntax
+FDR <CR>
Default value
3 seconds in some places
The DCE reports the negotiated T.30 parameters, with the remote ID information if available. When the DCE is ready to commence data transfer, it issues a CONNECT response code. If the DCE cannot resume data transfer because there is no more data, it responds OK. When the DTE is ready to accept data, it issues an <DC2> character (018) to the DCE.
If the DTE issues an <XOFF> character to the DCE for flow control, the DCE signals the DTE when its buffers are empty by sending a <DLE><DC2> (<016><018>) character pair.
When the DCE delivers the last byte of a page, the DCE reports the Page Transfer Status via the +FPTS:<ppr> response ( Table 27).
After a Page Transfer Status Report, the DCE reports the post page message from the remote facsimile station with the +FET:<ppm> response ( Table 26) which signals the intentions of the remote station.
The DCE holds the post page response message to the remote facsimile station (MCF, etc.), represented in the +FPTS parameter until the next +FDR command. The DTE may modify the +FPTS parameter before issuing the +FDR command which releases that message. The DTE must issue a +FDR command to release Post Page Messages.
Initiate Document Reception
The +FDR command may be issued in Phase B after an answer command, or in Phase B after a previous document.
The DCE response in stream mode is:
•
•
•
•
•
•
•
•
•
Continue Document Reception
The DTE may issue a +FDR command in Phase D, which releases the post page message, and indicates readiness to receive another page after receipt of a Multipage (+FET:0) or PPS-NULL (+FET:3) message. The DCE response will be:
•
•
•
•
•
•
If done receiving:
•
•
Continue page reception
Phase C Data Framing
Phase C data may be presented to the DTE in stream mode. The DCE will transfer a stream of data to the DTE, followed by the <DLE><ETX> stream termination characters. The DCE will filter the stream as described in the "Serial Port Speed and Flow Control" section.
Phase C Data Format
The received data format is negotiated under T.30 reported by the +FDCS:VR,BR,WD,LN,DF,EC,BF,ST response.
The DCE will delete the terminating RTC (6 EOLs) patterns.
<CAN>, Escape from Reception
From the +FDR command until the end of Phase D Date, the DCE is in a data transfer state, and will not respond to DTE command characters. The DCE will respond to three ASCII control characters: <DC1> (017) and <DC3> (019) flow control characters, and cancel <CAN> (024).
Upon receipt of the <CAN> character, the DCE will terminate the reporting of received data by sending trailing <DLE><ETX> characters to the DTE, and will then execute an implied +FK command in order to conduct an orderly disconnection.
+FK, Session Termination
The +FK command causes the DCE to terminate the session in an orderly manner. In particular, the DCE will send a DCN message at the next opportunity and hang up. At the end of the termination process, the DCE will report the +FHNG response with result code ( Table 28).
Syntax
+FK
This operation can be invoked by using the cancel <CAN> character during Phase C data reception (see prior section)
The DCE will wait until the current page completes, unless the reception is of unlimited length; in that case, the DCE may halt reception and terminate the session at any time.
+FCIG, Set Polling ID
This command allows setting the Local Polling ID string used in a CIG frame. The syntax of this command is identical to +FLID.
Write syntax
+FCIG="<local ID string>"
Valid value
20-character ASCII string
Default value
Null string
+FLPL, Indicate a Document for Polling
This command allows setting up an answering modem to know that it has a document available for polling. This allows a calling modem to receive this fax from the answerer.
Syntax
AT+FLPL=<value>
Valid Values
0: Document not available
1: Document available
+FSPL, Enable Polling
This command allows setting up an originating modem to be able to request to receive a document from a polled station.
Syntax
AT+FSPL=<value>
Valid Values
0: Request disallowed
1: Request allowed
Service Class 2 DCE Responses
The DCE sends information responses to the DTE as a facsimile session proceeds. They indicate the state of the facsimile session and convey needed information. These messages are solicited messages generated in execution of DTE action commands described in the "Service Class 2 Action Commands" section.
The DCE precedes and follows the information responses with <CR><LF>.
The DCE provides the on-line status of several session parameters when they are available during T.30 handshaking. These include the remote ID string and the DIS/DCS parameters. These responses report the T.30 session parameter frames. The subparameters are described in Table 25.
+FCON, Facsimile Connection Response
+FCON indicates connection with a fax machine. It is released by detection of HDLC flags in the first received frame. +FCON is generated in response to an Originate or Answer command.
+FDCS:, Report Current Session Capabilities
+FDCS:<string> reports the negotiated parameters. Phase C data will be formatted as described by the subparameters. This message may be generated in execution of +FDT or +FDR commands before the CONNECT result code if new DCS frames are generated or received. (See Table 25)
Syntax
+FDCS:VR,BR,WD,LN,DF,EC,BF,ST
+FDIS:, Report Remote Station Capabilities
+FDIS:<string> reports remote facsimile station capabilities and intentions. The parameters are provided in ASCII notation. (See Table 25)
Syntax
+FDIS:VR,BR,WD,LN,DF,EC,BF,ST
This message is generated in execution of Originate, Answer, +FDT, or +FDR commands.
+FCFR, Indicate Confirmation to Receive
The DCE sends a +FCFR response to the DTE upon reception of an acceptable TCF training burst and a valid DCS signal from the remote machine. This indicates that the DCE will receive Phase C data after the remote station receives the local DCE's CFR message. The +FCFR message is generated in execution of a +FDR command.
Syntax
+FCFR
+FTSI:, Report the Transmit Station ID
This response reports the received transmit station ID string, if any. This message is generated in execution of Originate, Answer, +FDT, or +FDR commands.
Syntax
+FTSI: "<TSI ID string>" Transmit Station ID
+FCSI:, Report the Called Station ID
This response reports the received called station ID string, if any. This message is generated in execution of Originate, Answer, +FDT, or +FDR commands.
Syntax
+FCSI: "<CSI ID string>" Called Station ID
+FPTS:, Receive Page Transfer Status
The +FPTS:<ppr> is generated by the DCE at the end of Phase C data reception in execution of a +FDR command.
Syntax
+FPTS:<ppr>, <lc> [,<blc>, <cblc>]
The <ppr> is generated by the DCE; it depends on the DCE capabilities at T.4 error checking. See Table 27 for <ppr> values.
The receiving DCE will count the lines. These values are:
•
•
•
A receiving DTE may inspect <ppr> and write a modified value into the +FPTS parameter. The DCE will hold the corresponding Post Page Response message until released by a +FDR command from the DTE.
+FET:, Post Page Message Response
The +FET:<post page message> response is generated by a receiving DCE after the end of Phase C reception on receipt of the post-page message from the transmitting station. The +FET:<ppm> response is generated in execution of a +FDR command. The <ppm> codes respond to the T.30 post page messages ( Table 26).
Syntax
+FET:<ppm>
+FPTS:, Transmit Page Transfer Status
The +FPTS: response reports a <ppr> number representing the copy quality and related post-page message responses received from the remote DCE. The valid <ppr> values are defined in Table 27.
Syntax
+FPTS:<ppr>
The +FPTS:<ppr> response is generated in execution of a +FET=<ppm> command.
+FHNG:, Call Termination with Status
+FHNG indicates that the call has been terminated. The hangup cause is reported and stored in the +FAXERR parameter for later inspection. The <hangup status code> values are described in Table 28.
Syntax
+FHNG:<hangup status code>
+FHNG:<hsc> is a possible intermediate result code to any DTE action command described in the "Service Class 2 Action Commands" section. It is always followed by the OK final result code.
Upon termination of a call, the DCE determines the cause of termination and reports it as part of the FHNG:<hsc> response. It also stores this <hsc> code in the +FAXERR parameter for later inspection.
The hangup values are organized according to the phases of the facsimile transaction as defined by T.30. A COMREC error or RSPREC error indicates that one of two events occurred:
1.
2.
The table values are in decimal notation. Leading zero characters are optional.
+FCIG:, Report the Polled Station ID
This response reports the received transmit station ID string, if any. This message is generated in execution of Originate, Answer, +FDT, or +FDR commands.
Syntax
+FCIG: "<ID string>" Polled Station ID
+FDTC:, Report the Polled Station Capabilities
If the answerer has a document to poll, it would be communicated to the originator in bit 9 of the DIS frame. The originating station may elect to transmit a fax, and later, send SIG and DTC frames to pick up the polled document. The answering station would report the incoming DTC frame via the +FDTC: response message after command mode is cancelled with the AT+FDR command.
Syntax
+FDTC: "<string>" Polled Station Capabilities
+FPOLL, Indicate Polling Request
This message is sent to the DTE if the received DIS message indicates that the remote station has a document to poll (by bit 9 in the DIS) and polling has been enabled with the AT+FSPL command. The DTE may then decide to receive rather than transmit.
Syntax
+FPOLL:
Service Class 2 Parameters
All Service Class 2 parameters can be read, written, and tested for range of legal values by the DCE. The general syntax is described in the "Command Syntax and Guidelines" section.
Group 3 FAX devices negotiate session parameters in DIS, DCS, and DTC frames. The following parameters are provided to condition the facsimile DCE for the capabilities it will offer and to report the session settings negotiated.
The three primary T.30 session parameters are +FDCC, +FDIS and +FDCS. They are compound parameters, using values listed in Table 25. illustrates their relationships.
Figure 1 T.30 Session Parameter Relationships
+FDCC, DCE Capabilities Parameters
+FDCC allows the DTE to sense and constrain the capabilities of the facsimile DCE from the choices defined in CCITT T.30 Table 2. When +FDCC is modified by the DTE, the DCE copies +FDCC into +FDIS.
Write syntax
+FDCC=VR,BR,WD,LN,DF,ED,BF,ST
Valid values
See Table 25
Default values
0,3,0,2,0,0,0,0 (9600 bps fax models)
or
0,5,0,2,0,0,0,0 (14400 bps fax models)
+FDIS, Current Sessions Capabilities Parameters
The +FDIS parameter allows the DTE to sense and constrain the capabilities used for the current session. The DCE uses +FDIS to generate DIS or DTC messages directly, and uses +FDIS and received DIS messages to generate DCS messages.
Write syntax
+FDIS=VR,BR,WD,LN,DF,EC,BF,ST
Valid values
See Table 25
Default values
0,3,0,2,0,0,0,0 (9600 bps fax models)
or
0,5,0,2,0,0,0,0 (14400 bps fax models)
The DCE initializes the +FDIS parameter from the +FDCC parameter on initialization, when +FDCC is written, and at the end of a session.
+FDCS, Current Session Results Parameters
The +FDCS parameter is loaded with the negotiated T.30 parameters for the current session. A transmitting DCE generates DCS; a receiving DCE gets DCS from the remote station. The DTE may read this parameter.
Read Syntax
+FDCS?
DCE response
+FDCS=VR,BR,WD,LN,DF,EC,BF,ST
or
FDCS=
Valid values
See Table 25
Default values
0,0,0,0,0,0,0,0
The +FDCS parameter is initialized 0,0,0,0,0,0,0,0 upon initialization and at the beginning of a session. If the DTE issues a +FDCS? command in the initial state, the DCE reports:
<CR><LF>0,0,0,0,0,0,0,0<CR><LF>The contents of +FDCS are spontaneously reported during execution of +FDR or +FDT commands by the +FDCS:VR,BR,WD,LN,BF,EC,BF,ST response using the same compound parameter format.
Several commands and responses reference T.30 session negotiated parameters. These are described by a set of common subparameters. These subparameters are described in Table 25 with notes. Optional parameter values are marked with footnote 2. Unspecified parameter values are reserved for future use.
The +FDCC, +FDIS, and +FDCS compound parameters use these session parameters (On writes, unspecified subparameters are unchanged.)
The +FDIS:, +FDCS:, and +FDTC: session report responses use these subparameters.
For test response, ranges of values are reported for each subparameter enclosed in parentheses characters. For example, a DCE response to +FDCC=? could report:
<CRLF> (0,1), (0-5), (0-3), (0-2), (0-2), (0-2), (0), (0-7) <CRLF> (14400 fax models)Example
+FDIS=0,5,0,2,0,0,0,1 =
•
•
•
•
•
•
•
•
+FLID=, Local ID String
Write syntax
+FLID="<local ID string>"
Valid value
20-character ASCII string
Default value
Null string
If FLID is not a null string, it generates a TSI or CSI frame. CCITT Table 3/T.30 includes digits 0-9, "+" and space.
If the DCE supports use of CCITT Table 3/T.30 only, the response to a +FLID=? command is "(20) (32, 43, 48-57)." If the DCE supports printable ASCII <, the response is: "(20) (32-127)<CRLF>." The first "(20)" represents string length, the second (character values) field reports supported string values.
•
•
•
+FCR, Capability to Receive
Write syntax
+FCR=<value>
Valid values
0 or 1
Default value
0
+FCR=0 indicates that the DCE will not receive message data. This can be used when the DTE has insufficient storage. The DCE can send and can be polled for a file.
+FCR is sampled in CCITT T.30 Phase A and Phase D.
+FPTS=, Page Transfer Status
The +FPTS parameter contains a value representing the post page response, including copy quality and related end-of-page status. These values correspond to post page response messages defined in T.30. The receiving DCE sets this parameter after it receives a page of Phase C data. The transmitting DCE sets this parameter with the status reported by the receiving station. The DTE may inspect or modify this parameter.
Write Syntax
+FPTS=<ppr>
Valid values
1, 2, 3, 4, 5
Default value
0
The set of <ppr> values is defined in CCITT Table 6-4. These values are also reported in the +FPTS response to the +FDR command.
+FCQ, Copy Quality Checking
This parameter controls Copy Quality checking by a receiving facsimile DCE.
Write syntax
+FCQ=<value>
Valid values
0
Default value
0
The DCE returns +FCQ=0 which indicates the DCE does no quality checking. The DCE will generate Copy Quality OK (MCF) responses to complete pages, and set +FPTS=1.
+FPHCTO, DTE Phase C Response Time-out
The +FPHCTO command determines how long the DCE will wait for a command after reaching the end of data when transmitting in Phase C. When this time-out is reached, the DCE assumes there are no more pages and no documents to send. It then sends the T.30 EOP response to the remote device.
Write syntax
+FPHCTO=<value>
Valid values
0 - 255, 100 millisecond units.
Default value
30
+FAXERR, T.30 Session Error Report
This read-only parameter indicates the cause of the hangup. CCITT Table 6-5 shows the valid values for this parameter as well as the meaning of the each value. +FAXERR is set by the DCE at the conclusion of a fax session. The DCE resets +FAXERR to 0 at the beginning of Phase A off-hook time.
Read syntax
+FAXERR= <table value>, read only
Valid values
0 - 255, see CCITT Table 6-5 for meaning
+FBOR, Data Bit Order
This command controls Phase C data (T.4 encoded data) transferred during execution of +FDT or +FDR commands.
Write syntax
+FBOR=<value>
Valid values
0, 1, 2, or 3
Default value
0
This parameter controls the mapping between PSTN facsimile data and the DTE-DCE link. There are two choices:
•
•
The following two codes are supported:
•
•
Note
+FAA, Answer Parameter
+FAA=0 constrains the DCE to answer as set by +FCLASS.
+FAA=1 indicates that the DCE can answer and automatically determine whether to answer as a Class 2 facsimile DCE or as a data modem. If the DCE automatically switches, it modifies FCLASS appropriately.
Write syntax
+FAA=<value>
Valid values
0 or 1
Default value
0
Fax adaptive answer operates only when +FCLASS=0.
Class 2 adaptive answer is implemented as follows:
1.
2.
+FBUF?, Buffer Size
The +FBUF parameter allows the DTE to determine the characteristics of the DCE's data buffer. Data buffers are used for flow control. Use of the reported values allow the DTE to transfer data without provoking XOFF.
Read syntax
+FBUF?
DCE response syntax
<bs>, <xoft>, <xont>, <bc>, where:
•
•
•
•
Example
+FBUF?
512, 506, 500, 0
Example Sessions
Table 29 and Table 30 show the typical commands and responses for sending and receiving two pages, respectively.
Any Internet Protocol (IP) addresses used in this document are not intended to be actual addresses. Any examples, command display output, and figures included in the document are shown for illustrative purposes only. Any use of actual IP addresses in illustrative content is unintentional and coincidental.
© 2007 Cisco Systems, Inc. All rights reserved.
Posted: Mon Dec 10 15:13:05 PST 2007
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