Lucent Technologies Host-Based Controller Modem AT User Manual

Data Addendum

Version 1.1

June 15, 1998

Host-Based Controller Modem AT Command Set

Contents Page

AT Command Summary ........................................2

AT Commands Reference ..................................... 6

Test and Debug AT Commands..........................24

AT Commands Reference S-Registers ...............29

AT FAX Command Set (Class 1 FAX).................. 36

AT FAX Commands Reference............................37

AT Voice Command Set....................................... 42

AT Voice Commands Reference .........................43

OMMANDS: SPEAKERPHONE OPERATION......... 45

AT C

OMMANDS: TELEPHONE ANSWERING DEVICE...45

AT C

OICE COMMAND SET NOT DEFINED IN IS-101

AT V

PECIFICATIONS...................................................48

S

OICE MODEM COMMAND EXAMPLES ..................... 49

V

AT DSVD Commands...........................................56

V.25ter AT Commands.........................................57

V.80 AT Commands............................................. 59

AT Commands for Homologation Testing and

Debugging............................................................ 61

ONFIGURING FOR DIFFERENT COUNTRIES.............63

C

OUNTRY SPECIFIC HOMOLOGATION PARAMETERS .69

C

OUNTRY SPECIFIC S REGISTER DEFAULTS............84

C

HANGING THE DTMF DIAL SPEED DEFAULT VALUE86

C

Introduction

This document specifies the Lucent Technologies
MTC AT Command Set for the host-based controller
modem products. Note that if a particular modem
board does not support a feature (such as voice),
then the corresponding commands are disabled for
that modem.

Host-Based Controller Modem Data Addendum
AT Command Set June 15,
1998

AT Command Summary

The following tables summarize the commands implemented by the modem. Commands may be executed when
the modem is in COMMAND mode. COMMAND mode is entered upon under one of the following conditions:

✟ After power up
✟ At the termination of a connection
✟ After the execution of a command other than dial or answer commands (ATO or AT&T)
✟ Upon the receipt of the ESCAPE SEQUENCE (three consecutive characters matching the contents of

S register 2) while on-line mode

✟ Upon the on-to-off transition of DTR if &D1, &D2, or &D3 has been set

Table 1. AT Command Set Summary

Command Description Command Description

A/ Repeat last command &J Auxiliary relay options

A Answer command &K Local flow control selection
B Communication standard setting &M Asynchronous communications mode
C Carrier control &Q Asynchronous communications mode
D Dial command &S Data set ready (DSR) option
E Echo command &T Self-test commands
F On-line data character echo command &V View the active configuration
H Hook control &W Store current configuration

I Request ID information &Y Select stored profile for hard reset

L Monitor speaker volume &Z Store telephone number

M Monitor speaker mode \A MNP block size

N Modulation handshake \B Send break

O Return to on-line data mode \G Modem port flow control

P Select pulse dialing \J Adjust bits/s rate control

Q Result code control \K Set break control

T Select tone dialing \N Error control mode selection
V DCE response format \Q Local flow control selection

W Result code option \R Ring indicator off after answer

X Result code selection and call progress

monitoring
Y Long-space disconnect \V Protocol result code
Z Reset and recall stored profile \X XON/XOFF pass through

&B V.32 auto retrain %B View numbers in blacklist
&C Data carrier detect (DCD) control %C Data compression control
&D Data terminal ready (DTR) %E Automatic rate change
&F Local factory settings -C Data calling tone

&G V.22bis guard tone control -V90 Enable/disable V.90 settings

\T Inactivity timer

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AT Command Summary (continued)

Table 2. AT Testing and Debugging Command Set Summary

Command Description Command Description

&&C Write to/read from host interface %T94 Test external DSP RAM
&&L Line-to-line loopback %T124 Return to on-chip DSP RAM
&&R Write to/read from DSP RAM location %T125 Load K56flex image to external DSP RAM
&&S Speaker codec loopback #UD Unimodem diagnostics

Table 3. The S-Register Summary

Register Default Description

S0 0 Automatic answer ring number
S1 0 Ring counter
S2 43 AT escape character
S3 13 Command line termination character
S4 10 Response formatting character
S5 8 Command line editing character
S6 2 Wait before dialing
S7 50 Connection completion time-out
S8 2 Comma dial modifier time
S10 20 Automatic disconnect delay
S11 95 DTMF dialing speed
S12 50 Escape guard time
S14 8 General bit-mapped options status
S21 48 V.24 bit-mapped options status
S22 112 Results bit-mapped options status
S24 10 Timer to control sleep mode
S28 1 V.34 modulation enable/disable
S30 0 Inactivity timer
S32 16 Synthetic ring volume
S33 0 Synthetic ring frequency
S35 0 Data calling tone
S36 7 Negotiation fallback
S37 0 Dial line rate
S38 1 Enable/disable K56flex settings
S42* 1 Auto rate
S43* 1 Auto mode
S48 7 LAPM error control and feature negotiation
S89 10 Timer to control sleep mode
S90 10 Local phone status
S91 15 Line transmit level
S108 7 Network codec type

* S-registers 42, and 43 are for test and debugging purposes only.

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AT Command Set June 15,
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AT Command Summary (continued)

Table 4. The Result Code Summary

Result Code Numeric Description

OK 0 Command executed
CONNECT 1 Modem connected to line
RING 2 A ring signal has been detected
NO CARRIER 3 Modem lost carrier signal, or does not detect carrier signal, or does

not detect answer tone
ERROR 4 Invalid command
CONNECT 1200 EC* 5 Connection at 1200 bit/s
NO DIALTONE 6 No dial tone detected
BUSY 7 Busy signal detected
NO ANSWER 8 Remote end never answered
CONNECT 2400 EC* 10 Connection at 2400 bit/s
CONNECT 4800 EC* 11 Connection at 4800 bit/s
CONNECT 9600 EC* 12
CONNECT 14400 EC* 13 Connection at 14400 bit/s
CONNECT 19200 EC* 14 Connection at 19200 bit/s
CONNECT 7200 EC* 24 Connection at 7200 bit/s
CONNECT 12000 EC* 25 Connection at 12000 bit/s
CONNECT 16800 EC* 86 Connection at 16800 bit/s
CONNECT 300 EC* 40 Connection at 300 bit/s
CONNECT 21600 EC* 55 Connection at 21600 bit/s
CONNECT 24000 EC* 56 Connection at 24000 bit/s
CONNECT 26400 EC* 57 Connection at 26400 bit/s
CONNECT 28800 EC* 58 Connection at 28800 bit/s
CONNECT 31200 EC* 59 Connection at 31200 bit/s
CONNECT 33600 EC* 60 Connection at 33600 bit/s
CONNECT 38400 EC* 28 Connection at 38400 bit/s (DTE rate)
CONNECT 57600 EC* 18 Connection at 57600 bit/s (DTE rate)
CONNECT 115200 EC* 87 Connection at 115200 bit/s (DTE rate)
DELAYED 88 Delay is in effect for the dialed number
BLACKLISTED 89 Dialed number is blacklisted
BLACKLIST FULL 90 Blacklist is full
CONNECT 32000 EC* 70 Connection at 32000 bit/s (K56flex mode) or V.90
CONNECT 34000 EC* 71 Connection at 34000 bit/s (K56flex mode)
CONNECT 36000 EC* 72 Connection at 36000 bit/s (K56flex mode) or V.90
CONNECT 38000 EC* 73 Connection at 38000 bit/s (K56flex mode)
CONNECT 40000 EC* 74 Connection at 40000 bit/s (K56flex mode) or V.90
CONNECT 42000 EC* 75 Connection at 42000 bit/s (K56flex mode)
CONNECT 44000 EC* 76 Connection at 44000 bit/s (K56flex mode) or V.90
CONNECT 46000 EC* 77 Connection at 46000 bit/s (K56flex mode)
CONNECT 48000 EC* 78 Connection at 48000 bit/s (K56flex mode) or V.90
CONNECT 50000 EC* 79 Connection at 50000 bit/s (K56flex mode)
CONNECT 52000 EC* 80 Connection at 52000 bit/s (K56flex mode) or V.90
CONNECT 54000 EC* 81 Connection at 54000 bit/s (K56flex mode)
CONNECT 56000 EC* 82 Connection at 56000 bit/s (K56flex mode)
CONNECT 28000 EC* 100 Connection at 28000 bit/s (V.90 mode)

Connection at 9600 bit/s

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June 15, 1998 AT Command Set
AT Command Summary (continued)

Result Code Numeric Description

CONNECT 29333 EC* 101 Connection at 29333 bit/s (V.90 mode)
CONNECT 30666 EC* 102 Connection at 30666 bit/s (V.90 mode)
CONNECT 33333 EC* 103 Connection at 33333 bit/s (V.90 mode)
CONNECT 34666 EC* 104 Connection at 34666 bit/s (V.90 mode)
CONNECT 37333 EC* 105 Connection at 37333 bit/s (V.90 mode)
CONNECT 38666 EC* 106 Connection at 38666 bit/s (V.90 mode)
CONNECT 41333 EC* 107 Connection at 41333 bit/s (V.90 mode)
CONNECT 42666 EC* 108 Connection at 42666 bit/s (V.90 mode)
CONNECT 45333 EC* 109 Connection at 45333 bit/s (V.90 mode)
CONNECT 46666 EC* 110 Connection at 46666 bit/s (V.90 mode)
CONNECT 49333 EC* 111 Connection at 49333 bit/s (V.90 mode)
CONNECT 50666 EC* 112 Connection at 50666 bit/s (V.90 mode)
CONNECT 53333 EC* 113 Connection at 53333 bit/s (V.90 mode)
CONNECT 54666 EC* 114 Connection at 54666 bits/s (V.90 mode)

* EC only appears when the extended result codes configuration option is enabled. EC is replaced by one of the following symbols,

depending upon the error control method used:

V42bis—V.42 error control and V.42bis data compression.
V42—V.42 error control only.

MNP 5—MNP class 4 error control and MNP class 5 data compression.
MNP 4—MNP class 4 error control only.

NoEC—No error control protocol.

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AT Commands Reference

AT commands are issued to the modem to control the modem's operation and software configuration. AT
commands can only be entered while the modem is in command mode. The format for entering AT commands is:

TYPE: ATXn where X is the AT command and n is the specific value for that

command.

PRESS: Enter If n is omitted from a command that takes a parameter valu, the
value 0 I(zero)

is assumed.
Any command issued is acknowledged with a response in either text or numeric values known as result codes.
Table 2 lists all the valid result codes.
In the following listing, all commands and command-values accepted by the modem are shown; any entries other
than those shown cause the ERROR result code.

+++ Escape sequence

The escape sequence allows the modem to exit data mode and enter on-line command mode. While in on-line
command mode, you may communicate directly to your modem using AT commands. Once you are finished, you
may return to data mode using the ATO command.
A pause, the length which is set by the Escape Guard Time (S12), must be used before and after an escape
sequence is issued. This pause prevents the modem from interpreting the escape sequence as data.
The value of the escape sequence character may be changed using Register S2.

A/ Repeat Last Command

This command repeats the last command string entered. Do not precede this command with an AT prefix or
conclude it by pressing Enter.

A Answer Command

This command instructs the modem to go off-hook and answer an incoming call.

Bn Communication Standard Setting

This command determines CCITT vs. Bell standard.

B0: Selects CCITT V.22 mode when the modem is at 1200 bits/s.
B1: Selects Bell 212A when the modem is at 1200 bits/s (default).
B2: Unselects V23 reverse channel (same as B3 ).
B3: Unselects V23 reverse channel (same as B2 ).
B15: Selects V.21 when the modem is at 300 bits/s.
B16: Selects Bell 103J when the modem is at 300 bits/s (default).

Result Codes:

OK n = 0, 1, 2, 3, 15, 16
ERROR Otherwise

Cn Carrier Control

The modem will accept the C1 command without error in order to assure backward compatibility with
communications software that issues the C1 command. However, this modem does not support the C0
command. The C0 command may instruct some other modems not to send carrier (i.e., it puts them in a receive­only mode).

C0: Transmit carrier always off.
C1: Normal transmit carrier switching.

Result Codes:

OK n = 1
ERROR Otherwise

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June 15, 1998 AT Command Set
AT Command Reference (continued)

Dn Dial

This command instructs the modem to begin the dialing sequence. The dial string (n, including modifiers and the
telephone number) is entered after the ATD command.

A dial string can be up to 60 characters long. Any digit or symbol (09, *, #, A, B, C, D) may be dialed as touch­tone digits. Characters such as spaces, hyphens, and parentheses do not countthey are ignored by the
modem and may be included in the dial string to enhance readability.

The following may be used as dial string modifiers:

L Redials last number. Should be the first character following ATD, ignored otherwise.
P Pulse dialing.
T Touch-tone dialing (default).
, Pause during dialing. Pause for time specified in Register S8 before processing the next

character

in the dial string.
W Wait for dial tone. Modem waits for a second dial tone before processing the dial string.
V The modem switches to speakerphone mode and dials the number. An ATH command may be

used to

disconnect the voice call.
@ Wait for quiet answer. Wait for five seconds of silence after dialing the number. If silence is not

detected, the modem sends a NO ANSWER result code back to the user.
! Hook flash. Causes the modem to go on-hook for 0.5 seconds and then return to off-hook.
; Return to command mode. Causes the modem to return to command mode after dialing the

number,

without disconnecting the call.
^ Disable data calling tone transmission.
S=n Dial a telephone number previously stored using the &Zn=x command (see the &Zn=x command for

further information). The range of n is 0—3.
$ Bong tone detection

En Echo Command

This command controls whether or not the characters entered from your computer keyboard are echoed back to
your monitor while the modem is in command mode.

E0: Disables echo to the computer.
E1: Enables echo to the computer (default).

Result Codes:

OK n = 0, 1
ERROR Otherwise

Fn Online Data Character Echo Command

This command determines if the modem will echo data from the DTE. This modem does not support the F0
version of the command. However, the modem will accept F1, which may be issued by older communication
software, to assure backward compatibility.

F0: Online data character echo enabled (NOT SUPPORTED).
F1: Online character echo disabled.

Result Codes:

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AT Command Reference (continued)

OK n = 1

ERROR Otherwise

Hn Hook Control

This command instructs the modem to go on-hook to disconnect a call, or off-hook to make the phone line busy.

H0: Modem goes on-hook (default).
H1: Modem goes off-hook.

Result Codes:

OK n = 0, 1
ERROR Otherwise

In Request ID Information

This command displays specific product information about the modem.

I0: Returns modem identity string and driver version number, same as I3.
I1: Calculates ROM checksum and displays it on the DTE.
I2: Performs a ROM check and calculates and verifies the checksum displaying OK or

ERROR.

I3: Returns modem identity string and driver version number, same as I0.
I4: Returns firmware version for data pump.
I5: Returns the board/firmware ID and country ID in hexadecimal (for Apollo).

Returns the code ver, board ID, country ID and subsystem vendor ID in hexadecimal (for

MARS).

I6-8: Returns OK for compatibility.
I9: Returns country ID in English.
I11: Displays connection information as described in the following example.

Result Codes:

As described n = 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 11

ERROR Otherwise

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June 15, 1998 AT Command Set
AT Command Reference (continued)

The ATI11 result has two pages; the user must hit a key to get the second page. See the following example:
ati11
Description K56flex connection V.90 Connection

--------------- ------------------ --------------­1 Last Connection 56K V.90
2 Initial Transmit Carrier Rate 28800 28800
3 Initial Receive Carrier Rate 50000 49333
4 Final Transmit Carrier Rate 28800 28800
5 Final Receive Carrier Rate 50000 49333
6 Protocol Negotiation Result LAPM LAPM
7 Data Compression Result V42bis V42bis
8 Estimated Noise Level 152 152
9 Receive Signal Power Level (-dBm) 25 25
10 Transmit Signal Power Level (-dBm) 16 16
11 Round Trip Delay (msec) 4 4
Press any key to continue; ESC to quit.

12 Near Echo Level (-dBm) NA NA
13 Far Echo Level (-dBm) NA NA
14 Transmit Frame Count 3 3
15 Transmit Frame Error Count 0 0
16 Receive Frame Count 0 0
17 Receive Frame Error Count 0 0
18 Retrain by Local Modem 0 0
19 Retrain by Remote Modem 0 0
20 Call Termination Cause 0 0
21 Robbed-Bit Signaling 00 00
22 Digital Loss (dB) 6 6
23 Remote Server ID 4342C3 NA

OK
The ATI11 command may be issued from on-line command mode or after the end of a call. After a call, some of
the values are no longer valid; it's useful to know which ones.
Each of the line items in the ATI11 result is explained next:

V.90, 56K, V.34, or V.32 depending on the type of connection negotiated.

1.

Initial upstream rate

2.

Initial downstream rate

3.

Current or final upstream rate

4.

Current or final downstream rate

5.

LAPM or MNP or None, depending on V.42 negotiation

6.

V42bis or MNP or None, depending on V.42 negotiation

7.

Mean-square error of received downstream signal. Difference between received constellation point and

8.
reference decision point. This is a dimensionless decimal number, only valid during a call. Higher numbers
are worse. There's no absolute threshold of goodness; it depends on the downstream data rate. The number
varies during a call, so it can be useful to sample it a few times.

The received signal power, although labeled -dBm, is only a relative measure for comparing calls to/from

9.
different locations. Only valid during a call.

Upstream transmit signal power.

10.

Round-trip delay in milliseconds.

11.

Echo levels are valid for V.34 only.

12.

Echo levels are valid for V.34 only.

13.

Number of LAPM frames sent upstream during this call. Count wraps around at 65535.

14.

Number of REJ frames received at the analog client modem.

15.

Number of LAPM frames received by client during this call. Count wraps around at 65535.

16.

Number of frames received in error by the client.

17.

Number of retrains or rate renegotiations requested by this modem.

18.

Number of retrains or rate renegotiations requested by remote modem.

19.

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AT Command Reference (continued)

20. Reason for call ending, only valid after call ends:
0 = Local modem command: ATH, DTR drop
1 = Remote modem: cleardown, loss of signal
2 = No answer, busy, etc.
3 = Training failure V.90, K56flex or V.34.
4 = Protocol failure if required by \N4, for example.

For PCM connection only, a hexadecimal 6-bit pattern of T1 frames with robbed-bit signaling.

21.

For PCM connection only, the downstream digital loss.

22.

For K56flex connection only, the V.8bis info sent by the server. Meaning is defined at the server and by

23.
convention. Example above is from a recent Ascend MAX in µ-Law.

Ln Monitor Speaker Volume

This command sets speaker volume to low, medium, or high.

L0: Selects low volume.
L1: Selects low volume.
L2: Selects medium volume (default).
L3: Selects high volume.

Result Codes:

OK n = 0, 1, 2, 3
ERROR Otherwise

Mn Monitor Speaker Mode

This command turns the speaker on or off.

M0: The speaker is off.
M1: The speaker is on until the modem detects the carrier signal (default).
M2: The speaker is always on when modem is off-hook.
M3: The speaker is on until the carrier is detected, except while dialing.

Result Codes:

OK n = 0, 1, 2, 3
ERROR Otherwise

Nn Modulation Handshake

This command controls whether or not the local modem performs a negotiated handshake at connection time with
the remote modem when the communication speed of the two modems is different.

N0: When originating or answering, this is for handshake only at the communication standard specified by

S37 and the ATB command.

N1: When originating or answering, begin the handshake only at the communication standard specified by

S37 and the ATB command. During handshake, fallback to a lower speed may occur (default).

Result Codes:

OK n = 0, 1
ERROR Otherwise

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AT Command Reference (continued)

On Return On-line to Data Mode

O0: Instructs the modem to exit on-line command mode and return to data mode

(see AT Escape Sequence, +++).
O1: This command issues a retrain before returning to on-line data mode.
O3: This command issues a rate renegotiation before returning to on-line data mode.

Result Codes:

OK n = 0, 1, 3
ERROR Otherwise

P Select Pulse Dialing

This command configures the modem for pulse (non touch-tone) dialing. Dialed digits are pulsed until a T
command or dial modifier is received. Tone dial is the default setting.

Qn Result Code Control

Result codes are informational messages sent from the modem and displayed on your monitor. Basic result
codes are OK, CONNECT, RING, NO CARRIER, and ERROR. The ATQ command allows the user to turn result
codes on or off.

Q0: Enables modem to send result codes to the computer (default).
Q1: Disables modem from sending result codes to the computer.

Result Codes:

OK n = 0, 1
ERROR Otherwise

T Select Tone Dialing

This command instructs the modem to send DTMF tones while dialing. Dialed digits are tone dialed until a P
command or dial modifier is received. This is the default setting.

Vn DCE Response Format

This command controls whether result codes (including call progress and negotiation progress messages) are
displayed as words or their numeric equivalents. For the result code, see table 4.

V0: Displays result codes as digits.
V1: Displays result codes as text (default).

Result Codes:

OK n = 0, 1

ERROR Otherwise

ATV0 ATV1

Result Code Format <numeric code> <CR> <CR> <LF>

<verbose code> <CR> <LF>

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Dial Tone Detect

Busy Tone Detect

AT Command Set June 15, 1998
AT Command Reference (continued)

Wn Result Code Option

W0: CONNECT result code reports DTE receive speed. Disable protocol result codes.
W1: CONNECT result code reports DTE receive speed. Enable protocol result codes.
W2: CONNECT result code reports DCE receive speed. Enable protocol result codes (default).

Result Codes:

OK n = 0, 1, 2
ERROR Otherwise

Xn Result Code Selection and Call Progress Monitoring

This command enables tone detection options used in the dialing process. As these functions are chosen, the
modem chip set’s result codes are also affected. Therefore, this command is frequently used to control the
modem chip set’s responses. The primary function of this control is to control the modem chip set’s call response
capabilities.

Ext. Result Code

X0 Disable Disable Disable
X1 Enable Disable Disable
X2 Enable Enable Disable
X3 Enable Disable Enable
X4 Enable Enable Enable (default)
X5 Enable Enable Enable
X6 Enable Enable Enable
X7 Disable Enable Enable

Extended Result Codes

Disabled: Displays only the basic result codes OK, CONNECT, RING, NO CARRIER, and ERROR.
Enabled: Displays basic result codes, along with the connect message and the modem's date rate,
and an indication of the modem's error correction and data compression operation.

Dial Tone Detect

Disabled: The modem dials a call regardless of whether it detects a dial tone. The period of time
Enabled: The modem dials only upon detection of a dial tone, and disconnects the call if the dial

Busy Tone Detect

Disabled: The modem ignores any busy tones it receives.
Enabled: The modem monitors for busy tones.

Result Codes:

OK n = 0, 1, 2, 3, 4, 5, 6, 7
ERROR Otherwise

the modem waits before dialing is specified in register S6.
tone is not detected within 10 seconds.

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AT Command Reference (continued)

Yn Long Space Disconnect

Long space disconnect is always disabled.

Y0: Disable long space disconnect (default).
Y1: Enable long space disconnect (NOT SUPPORTED).

Result Codes:

OK n = 0
ERROR Otherwise

Zn Recall Stored Profile

This command instructs the modem chip set to go on-hook and restore the profile saved by the last &W
command. Either Z0 or Z1 restores the same single profile.
Result Codes:

OK n = 0, 1
ERROR Otherwise

&Bn V.32 Auto Retrain

This modem always auto retrains.

&B0: Disable V.32 auto retrain (NOT SUPPORTED).
&B1: Enable V.32 auto retrain (default).

Result Codes:

OK n = 1
ERROR Otherwise

&Cn Data Carrier Detect (DCD) Control

Data Carrier Detect is a signal from the modem to your computer indicating that the carrier signal is being
received from a remote modem. DCD normally turns off when the modem no longer detects the carrier signal.

&C0: The state of the carrier from the remote modem is ignored. DCD circuit is always on.
&C1: DCD turns on when the remote modem's carrier signal is detected, and off when the carrier signal

is not detected (default).

Result Codes:

OK n = 0, 1
ERROR Otherwise

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AT Command Set June 15, 1998
AT Command Reference (continued)

&Dn DTR Control

This command interprets how the modem responds to the state of the DTR signal and changes to the DTR signal.

&D0: Ignore. The modem ignores the true status of DTR and treats it as always on. This should only

be

used if your computer does not provide DTR to the modem.

&D1: If the DTR signal is not detected while in on-line data mode, the modem enters command mode,

issues OK result code, and remains connected.
&D2: If the DTR signal is not detected while in on-line data mode, the modem disconnects (default).
&D3: Reset modem on the on-to-off DTR transition.

Result Codes:

OK n = 0, 1, 2, 3

ERROR Otherwise

&Fn Load Factory Settings

This command loads the configuration stored and programmed at the factory. This operation replaces all of the
command options and the S-register settings in the active configuration with factory default values.
Note: In voice mode (AT+FCLASS=8), if the AT&F command is placed on the same line as other commands, the
command line is ignored. To load factory settings in voice mode, issue AT&F by itself.
Result Codes:

OK n = 0
ERROR Otherwise

&Gn V.22bis Guard Tone Control

This command determines which guard tone, if any, to transmit while transmitting in the high band (answer
mode). This command is only used in V.22 and V.22bis mode. This option is not used in North America and is for
international use only.

&G0: Guard tone disabled (default).
&G1: Sets guard tone to 550 Hz.
&G2: Sets guard tone to 1800 Hz.

Result Codes:

OK n = 0, 1, 2
ERROR Otherwise

&Jn Auxiliary Relay option

&J0: The auxiliary relay is never closed. (Default)
&J1: NOT SUPPORTED

Result Codes:

OK n = 0
ERROR Otherwise

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June 15, 1998 AT Command Set
AT Command Reference (continued)

&Kn Local Flow Control Selection

&K0: Disable flow control

&K1: Reserved

&K2: Reserved

&K3: Enable RTS/CTS (hardware) flow control (default)

&K4: Enable XON/XOFF flow control
Result Codes:

OK n = 0, 3, 4

ERROR Otherwise

&Mn Asynchronous Communications Mode

&M0: Asynchronous mode (default).
&M1: Reserved
&M2: Reserved
&M3: Reserved
&M4: Reserved

Result Codes:

OK n = 0

ERROR Otherwise

&Pn Pulse Dial Make-to-Break Ratio Selection

This Command is effective only for Japan.

&P0 39/61 make/break ratio, 10PPS
&P1 33/67 make/break ratio, 10PPS (default)
&P2 33/67 make/break ratio, 20PPS

Result Codes:

OK n = 0, 1, 2
ERROR Otherwise

&Qn Asynchronous Communications Mode

&Q0: Asynchronous Mode, buffered. Same as \N0.
&Q5: Error Control Mode, buffered (default). Same as \N3.
&Q6: Asynchronous Mode, buffered. Same as \N0.
&Q8: MNP error control mode. If an MNP error control protocol is not established, the modem will

fallback according to the current user setting in S36.

&Q9: V.42 or MNP error control mode. If neither error control protocol is established, the modem will

fallback according to the current user setting in S36.

Result Codes:

OK n = 0, 5, 6, 8, 9
ERROR Otherwise

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AT Command Reference (continued)

&Sn Data Set Ready (DSR) Option

This command selects DSR action.

&S0: DSR always ON (default).
&S1: DSR comes on when establishing a connection and goes off when the connection ends.

Result Codes:

OK n = 0, 1
ERROR Otherwise

&Tn Self-Test Commands

This command allows the user to perform diagnostic tests on the modem. These tests can help to isolate
problems when experiencing periodic data loss or random errors.

&T0 Abort. Stops any test in progress.

&T1 Local analog loop. This test verifies modem operation, as well as the connection

between the modem and computer. Any data entered at the local DTE is modulated, then

demodulated, and returned to the local DTE. To work properly, the modem must be off-line.
&T3 Local digital loopback test.
&T6 Remote digital loopback test. This test can verify the integrity of the local modem, the communications

link, and the remote modem. Any data entered at the local DTE is sent to, and returned from, the

remote modem. To work properly, the modems must be on-line with error control disabled.

Result Codes:

OK n = 0
CONNECT n = 1, 3, 6
ERROR Otherwise

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AT Command Reference (continued)

&V View Active Configuration and Stored Profile

This command is used to display the active profiles.
For example:

Option Selection
Comm Standard Bell B

CommandCharEcho Enabled E
Speaker Volume Medium L
Speaker Control OnUntilCarrier M
Result Codes Enabled Q
Dialer Type Tone T/P
ResultCode Form Text V
ExtendResultCode Enabled X
Dial Tone Detect Enabled X
Busy Tone Detect Enabled X
LSD Action Standard RS232 &C
DTR Action Standard RS232 &D

Press any key to continue; ESC to quit.

AT Cmd

Option Selection
V22b Guard Tone Disabled &G

Flow Control Hardware &K
Error Control Mode V42, MNP, Buffer \N
Data Compression Enabled %C
AutoAnswerRing# 0 S0
AT Escape Char 43 S2
CarriageReturnChar 13 S3
Linefeed Char 10 S4
Backspace Char 8 S5
Blind Dial Pause 2 sec S6
NoAnswer Timeout 50 sec S7
“ , “ Pause Time 2 sec S8

Press any key to continue; ESC to quit.

Option Selection
No Carrier Disc 2000 msec S10

DTMF Dial Speed 95 msec S11

Escape GuardTime 1000 msec S12
Data Calling Tone Disabled S35
Line Rate 33600 S37
DSVD mode Disabled -SSE

Stored Phone Numbers
&Z0=
&Z1=
&Z2=
&Z3=

OK

AT Cmd

AT Cmd

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AT Command Reference (continued)

&Wn Store Current Configuration

This command stores certain command options and S-register values except S3, S4, and S5. The ATZ command
or a power-up reset of the modem restores this profile.
Result Codes:

OK n = 0
ERROR Otherwise

&Yn Select Stored Profile for Hard Reset

This command does not change the behavior of the modem but is included for compatibility with applications that
issue the &Y0 command
&Y0: Select stored profile 0 on power-up
&Y1: ERROR

Result Codes:

OK n = 0
ERROR Otherwise

&Zn=x Store Telephone Number

This command is used to store up to four dialing strings for later dialing. The format for the command is &Zn =
”stored number” where n is the location 0—3 to which the number should be written. The dial string may contain
up to 40 characters. The ATDS = n command dials using the string stored in location n.
Result Codes:

OK n = 0, 1, 2, 3
ERROR Otherwise

\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.

\A0: 64 characters.
\A1: 128 characters.
\A2: 192 characters.
\A3: 256 characters (default).

Result Codes:

OK n = 0, 1, 2, 3
ERROR Otherwise

\Bn Transmit Break to Remote

In non-error-control mode, the modem will transmit a break signal to the remote modem with a length in multiples
of 100ms according to parameter specified. The command works in conjunction with the \K command.

\B1 - \B9: Break length in 100ms units. (Default = 3.) (Non-error-control mode only.)

Result Codes:

OK If connected in data modem mode.
NO CARRIER If not connected or connected in fax modem mode.

\G Modem Port Flow Control

\G0: Modem process XON/XOFF flow control characters locally (default).
\G1: Modem passes XON/XOFF flow control characters.

Result Codes:

OK n = 0, 1
ERROR Otherwise

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AT Command Reference (continued)

\J Bits/s Rate Adjusted

This command determines whether or not the negotiated connect speed of the modem forces the adjustment of
the speed of the DTE to the modem’s speed.

\J0: Buffer mode. Error control selected (or not) by \Nn command (default).
\J1: Force the max DCE rate to the DTE rate.

Result Codes:

OK n = 0 or 1
ERROR Otherwise

\Kn Break Control

Controls the response of the modem to a break received from the DTE or the remote modem or the \B command.
The response is different in three separate cases.
The first case is where the modem receives a break from the DTE when the modem is operating in data transfer
mode:

\K0: Enter on-line command mode, no break sent to the remote modem.
\K1: Clear data buffers and send break to remote modem.
\K2: Same as 0.
\K3: Send break to remote modem immediately.
\K4: Same as 0.
\K5: Send break to remote modem in sequence with transmitted data. (Default.)

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: Clear data buffers and send break to remote modem.
\K1: Clear data buffers and send break to remote modem. (Same as 0.)
\K2: Send break to remote modem immediately.
\K3: Send break to remote modem immediately. (Same as 2.)
\K4: Send break to remote modem in sequence with data.
\K5: Send break to remote modem in sequence with data. (Same as 4.) (Default.)

The third case is where there a break is received from a remote modem during a connection:

\K0: Clear data buffers and send break to the DTE.
\K1: Clear data buffers and send break to the DTE. (Same as 0.)
\K2: Send a break immediately to DTE.
\K3: Send a break immediately to DTE. (Same as 2.)
\K4: Send a break in sequence with received data to DTE.
\K5: Send a break in sequence with received data to DTE. (Same as 4.) (Default.)

Result Codes:

OK n = 0,1, 2, 3, 4, 5
ERROR Otherwise

\Nn Error Control Mode Selection

This command determines the type of error control used by the modem when sending or receiving data.

\N0: Buffer mode. No error control (same as &Q6).
\N1: Direct mode.
\N2: MNP* or disconnect mode. The modem attempts to connect using MNP 24 error control

procedures. If this fails, the modem disconnects. This is also known as MNP reliable

mode.

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AT Command Reference (continued)

\N3: V.42, MNP, or buffer (default).

The modem attempts to connect in V.42 error control mode. If this fails, the modem attempts to

connect in MNP mode. If this fails, the modem connects in buffer mode and continues

operation. This is also known as V.42/MNP auto reliable mode (same as &Q5).

\N4: V.42 or disconnect. The modem attempts to connect in V.42 error control mode. If this fails, the

call

will be disconnected.
\N5: V.42. MNP or buffer (same as \N3).
\N7: V.42. MNP or buffer (same as \N3).

Result Codes:

OK n = 0, 1, 2, 3, 4,5,7
ERROR Otherwise

\Q Local Flow Control Selection

\Q0: Disable flow control. Same as &K0.
\Q1: XON/XOFF software flow control. Same as &K4.
\Q2: CTS-only flow control. This is not supported and the response is ERROR.
\Q3: RTS/CTS to DTE (default). Same as &K3.

Result Codes:

OK n = 0, 1, 3
ERROR Otherwise

\Rn Ring indicator signal off after the telephone call is answered (Compatibility command)

\R0: ring indicator signal is off after the telephone call is answered

Result Codes:

OK n = 0
ERROR Otherwise

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AT Command Reference (continued)

\Tn Inactivity Timer

This command specifies the length of time (in minutes) that the modem will wait before disconnecting when no
data is sent or received. A setting of zero disables the timer. Alternatively, this timer may be specified in register
S30. This function is only applicable to buffer mode.

\T0: Inactivity timer disabled (default).
Result Codes:

OK n = 0 - 255

ERROR Otherwise

\Vn Protocol Result Code

\V0: Disable protocol result code appended to DCE speed.
\V1: Enable protocol result code appended to DCE speed (default).

\V2: Same as \V1.
Result Codes:
OK n = 0, 1

ERROR Otherwise

\Xn XON/XOFF Pass Through

\X0: Modem process XON/XOFF flow control characters locally (default).

\X1 Modem passes XON/XOFF flow control characters.
Result Codes:

OK n = 0, 1

ERROR Otherwise

-Cn Data Calling Tone

Data Calling Tone is a tone of certain frequency and cadence as specified in V.25 which allows remote
Data/FAX/Voice discrimination. The frequency is 1300 Hz with a cadence of .5 s on and 2 s off.

-C0: Disabled (default).

-C1: Enabled.

Result Codes:

OK n = 0, 1

ERROR Otherwise

-V90 = <n> command to enable/disable V.90 and change downstream rate

-V90=0 will disable V.90

-V90=1 will enable V.90 Auto Rate (default value)

-V90=X - controls the downstream rate

-V90? - Shows the current value

-V90=? - Shows the range [0-21]

See next page for the values of n.

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AT Command Set June 15, 1998
AT Command Reference (continued)

The table below shows the possible values:
“AT-V90=X” Downstream Rate

0 V.90 disabled
1 Auto Rate (default)
2 28000 kbit/s
3 29333 kbit/s
4 30666 kbit/s
5 32000 kbit/s
6 33333 kbit/s
7 34666 kbit/s
8 36000 kbit/s
9 37333 kbit/s
10 38666 kbit/s
11 40000 kbit/s
12 41333 kbit/s
13 42666 kbit/s
14 44000 kbit/s
15 45333 kbit/s
16 46666 kbit/s
17 48000 kbit/s
18 49333 kbit/s
19 50666 kbit/s
20 52000 kbit/s
21 53333 kbit/s

%B View Numbers in Blacklist

If blacklisting is in effect, this command displays the numbers for which the last call attempted in the past two
hours failed. The ERROR result code appears in countries that do not require blacklisting.

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AT Command Reference (continued)

%Cn Data Compression Control

This command determines the operation of V.42bis and MNP class 5 data compression. Online changes do not
take effect until a disconnect occurs first.

%C0: V.42bis/MNP 5 disabled. No data compression.

%C1: V.42bis/MNP 5 enabled. Data compression enabled (default).
Result Codes:

OK n = 0, 1

ERROR Otherwise

%En Enable/Disable Auto-Retrain and Fallback/Fall Forward

Provides option for the modem to automatically monitor line quality to fall back when line quality is insufficient and
to fall forward when line quality is sufficient.

%E0: Disable fallback/fall forward
%E1: Enable fallback, Disable fall forward
%E2: Enable fallback/fall forward (Default)

Result Codes:

OK n = 0,1, 2

ERROR Otherwise

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AT Command Set June 15,
1998

Test and Debug AT Commands

The following commands are to be used for testing and debugging only and are not meant for general use.

&&C Write to / Read from DSP Register

AT&&C<loc>,<val> writes the value <val> to DSP register at location <loc>.
AT&&C<loc> reads from location <loc>.

&&L Line-to-Line Loopback

This command provides a loopback for line-to-line.

&&R Write to/Read from DSP RAM Location

AT&&R<loc>,<val> writes the value <val> to DSP RAM location <loc>.
AT&&R<loc> reads from location <loc>.

&&S Speaker Codec Loopback

This command provides a loopback from the microphone to the speaker.

%T94 Test External RAM

This command “AT%T94” is used for testing the external RAM. If the external RAM is good, this command returns
“PASS”. If the external ram is not good, this command returns “FAIL”.

Example :

AT%T94
PASS - external ram is good

%T125, %T124 Test DSP 56K Version in External Ram

The command “AT%T125” is used for testing the DSP 56K code version and checksum running in external ram.
After issuing “AT%T125” the user may then issue “ATI4” to get DSP Version or “ATI1” to get the DSP checksum.
(The command “AT%T125” is not valid for ramless version of the DSP 56K code.)
The command “AT%124” is for internal ram version.

#UD Unimodem Diagnostics

The reference for the #UD command is Microsoft’s Draft Reference Specification rev.0.85. The Lucent
Technologies modem implements a subset of the parameters in that document.
#UD is an action command. It does not take parameters. It shall be the last command in the command line.
The modem logs aspects of its operation for each call, and saves these results (in volatile memory) until cleared
by one of the following events:

Power off (or D1 or D3 state entered)

1.

Hard reset (e.g. negate DTR with &D3 set, reset button)

2.

Soft reset = ATZ or AT&F

3.

ATD command issued

4.

ATA command issued

5.

Automatic answer (e.g. set register S0>0 and ring detected)

6.
These results are NOT cleared by changing DTR, V.24 circuit 108.2, if &D0, &D1 or &D2.
In response to this command, the modem reports one or more lines of information text as defined below.
Information text format is defined in ITU V.25ter: each line is preceded by a <CR><LF> pair, and terminated by
<CR><LF>. (Note: as per V.25ter, CR and LF characters may be changed by writing new values to the contents
of registers S2 and S3 respectively.)

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Test and Debug AT Commands (continued)

The modem may generate a single line or multiple lines, based on modem capabilities and call results, followed
by a standard OK final result code. For example, if call setup failed, only that result is useful. Each information
text line shall be formatted as follows, including one or more key=value pairs:

DIAG <token key=value [[key=value] [key=value]] …>
DIAG 5 characters, hex: 44, 49, 41, 47, 20
< left angle bracket (less than sign), hex: 3C
token unique 32-bit hexadecimal string 2A4D3263, hex: 32, 41, 34, 44, 33, 32, 36, 33
space space character, hex 20
key single hexadecimal numeric digit, see Table 1
= equal sign, hex: 3D
value any string as defined below (Tables 1-3, etc.)
> right angle bracket (greater than sign), hex: 3E
Unless otherwise noted, all values are hexadecimal numbers. Any numeric values from tables in ITU V.58 are
converted to hexadecimal. Multi-digit values are reported MSD first. Leading 0’s may be deleted.

The following table1 includes all the items listed in Microsoft’s specification for the AT#UD command. Within these
items, the one that has a check mark in the “Implemented” column is implemented in this release of the modem
product. For an item that has an extra option table, please check the corresponding option table to see exactly
which option has been implemented.

Table 1 - AT#UD Last Call Status Report Format

Key value(s) required Definition Implemented

0 2 digits yes Diagnostic Command Specification revision number, digit.digit X
1 Table 2 0-A Call Setup Result code X
2 Table 3 0-1 Multi-media mode
3 Table 4 0 DTE-DCE interface mode
4 String yes V.8 CM octet string, same format as V.25ter Annex A, in quotes
5 String yes V.8 JM octet string, same format as V.25ter Annex A, in quotes

6-F Reserved for call negotiation reports

10 2 digits
11 2 digits Note 4 Transmit signal power level, in –dBm (0-17) X

12 2 digits Note 4 Estimated noise level, in –dBm (10-90) X
13 2 digits Note 4 Normalized Mean Squared error, 100 (0x64) = minimum inter-symbol

14 2 digits Note 4 Near echo loss, in units of dB X
15 2 digits Note 4 Far echo loss, in units of dB X
16 4 digits Note 4 Far echo delay, in units of ms
17 2 digits Note 4 Round Trip delay, in units of ms X
18 Table 5 Note 4 V.34 INFO bit map

19-1F Reserved for modulation setup and training reports (Note 5)

20 Table 6 Note 6 Transmit Carrier Negotiation Result X
21 Table 6 Note 6 Receive Carrier Negotiation Result X
22 4 digits 0-1F40 Transmit Carrier symbol rate (0-8000) X
23 4 digits 0-1F40 Receive Carrier symbol rate (0-8000) X
24 4 digits 0-FA0 Transmit Carrier frequency (0-4000)
25 4 digits 0-FA0 Receive Carrier frequency (0-4000)
26 4 digits 0-FA00 Initial transmit carrier data rate (0-64000) X
27 4 digits 0-FA00 Initial receive carrier data rate (0-64000) X

28-2F Reserved

30 2 digits 0-FF Temporary carrier loss event count
31 2 digits 0-FF Carrier Rate re-negotiation event count
32 2 digits 0-FF Carrier Retrains requested X
33 2 digits 0-FF Carrier Retrain requests granted X
34 4 digits 0-FA00 Final transmit carrier rate X
35 4 digits 0-FA00 Final receive carrier rate X

36-3F Reserved

40 Table 7 0-2 Protocol Negotiation Result (Note 7) X

2 Received signal power level, in –dBm (0-43) X

Note 4

distance

1

Tables are numbered separately within this #UD section to be consistent with the Microsoft specification.

2

Notes refer to notes in the Microsoft specification

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41 3 digits 0-400 Error Control frame size
42 2 digits 0-FF Error control link timeouts X
43 2 digits 0-FF Error control link NAKs
44 Table 8 0-1 Compression Negotiation Result (Note 7) X
45 4 digits 0-200 Compression dictionary size (Note 7)

46-4F Reserved

50 1 digit 0-2 Transmit flow control: 0 = off; 1 = DC1/DC3; 2 = V.24 ckt 106/133
51 1 digit 0-2 Receive flow control: 0 = off; 1 = DC1/DC3; 2 = V.24 ckt 106/133
52 8 digits 0-FFFFFFFF Transmit characters sent from DTE (Note 8)
53 8 digits 0-FFFFFFFF Received characters sent to DTE (Note 8)
54 8 digits 0-FFFF Transmit characters lost (data overrun errors from DTE) (Note 9)
55 8 digits 0-FFFF Received characters lost (data overrun errors to DTE) (Note 9)
56 8 digits 0-FFFFFFFF Transmit Frame count, if error control protocol running (Note 8) X
57 8 digits 0-FFFFFFFF Received Frame count, if error control protocol running (Note 8) X
58 8 digits 0-FFFF Transmit Frame error count, if error control protocol running (Note 9) X
59 8 digits 0-FFFF Received Frame error count, if error control protocol running (Note 9) X

5A-5F Reserved

60 Tables 9-10 Note 10 Termination Cause X

61 2 digits 0-FF Call Waiting event count
62-7F Reserved for future versions of this specification
80-FF Reserved for manufacturer proprietary keys

Table 2 - Call Setup Result Codes

Code Definition Implemented

0 No previous call (modem log has been cleared since any previous calls) X
1 No dial tone detected X
2 Reorder signal detected, network busy
3 Busy signal detected X
4 No recognized signal detected X
5 Voice detected
6 Text telephone signal detected (see V.18)
7 Data Answering signal detected (e.g. V.25 ANS, V.8 ANSam) X
8 Data Calling signal detected (e.g. V.25 CT, V.8 CI)
9 Fax Answering signal detected (e.g. T.30 CED, DIS)
A Fax Calling signal detected (e.g. T.30 CNG)
B V.8bis signal detected

C-F Reserved

Table 6 - gstnModulationSchemeActive from 3.7.2/V.58

Value (hex) Description Implemented

0 V.17
1 V.21
2 V.22
3 V.22bis
4 V.23 Constant Carrier (1200/75)
5 V.23 Switched Carrier (half duplex)
6 V.26bis
7 V.26ter
8 V.27ter

9 V.29 HD
A V.32 X
B V.32bis
C V.34 X
D V.34 HD
E V.pcm (asymmetric)
F V.pcm (symmetric)

E-7F Reserved (V.58)

80 “X2™”
81 “K56FLEX™” X
82 “V.FC”
83 “V.32terbo”

80-FF Reserved for mfgs

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Test and Debug AT Commands (continued)

Table 7 - errorControl Active from 3.5.2/V.58

Value Description Implemented

0 Disable/none X
1 V.42 LAPM X
2 V.42 Alternative protocol (MNP™) X

3-7F Reserved (V.58)

80 MNP10™
81 ECP™ Enhanced Cellular Protocol
82 ETC

82-FF Reserved for mfgs

Table 8 - compressionActive from 3.2.2/V.58

Value Description Implemented

0 None X
1 V.42bis X

2-7F Reserved (V.58)

80 MNP5™ X

81-FF Reserved for mfgs

Table 9 - Additional callCleared codes (3.6.4/V.58)

Code Definition Implemented

1 No Previous call X
2 Call is still in progress X
3 Call Waiting signal detected
4 Delayed - see ETS 300 001 X

Table 10 - callCleared codes from 3.6.4/V.58-1994

callCleared: Indicates that the DCE has gone on hook and that the previously existing network connection has
been cleared. These values are hexadecimal, converted from decimal in V.58.

Value Description Notes Implemented

0 CauseUnidentified Call setup issues X

1-3 See Table 9 above X

A NMSinitiatedDialCall -- Network Management System

B NMSinitiatedLeasedLineRestoral
C NMSinitiatedRedial
D NMSinitiatedDialDisconnect

14 PowerLoss DCE
15 EquipmentFailure
16 FrontPanelDisconnectRequested
17 FrontPanelLeasedLineRestoral
18 AutomaticLeasedLineRestoral
19 InactivityTimerExpired X

1E cct116RestoralRequest DTE Interface

1F cct108isOffInhibitsDial
20 cct108turnedOff
28 NoNumberProvided Line Interface
29 BlacklistedNumber X

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