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Lucent/Agere Command Set (Advanced Users Only)

Compaq Notebook Series

Document Part Number: 277662-001

April 2002

This document describes the Lucent/Agere command set for advanced users, including AT commands, S-Registers, AT FAX commands, and other advanced modem commands.

Compaq, the Compaq logo, Evo, and Presario are trademarks of Compaq Information Technologies Group, L.P. in the U.S. and/or other countries.

Microsoft and Windows are trademarks of Microsoft Corporation in the U.S. and/or other countries.

All other product names mentioned herein may be trademarks of their respective companies.

Compaq shall not be liable for technical or editorial errors or omissions contained herein. The information is provided “as is” without warranty of any kind and is subject to change without notice. The warranties for Compaq products are set forth in the express limited warranty statements accompanying such products. Nothing herein should be construed as constituting an additional warranty.

Lucent/Agere Command Set (Advanced Users Only) First Edition April 2002 Document Part Number: 277662-001

Contents

1 AT Command Set

AT Data Command Set Summary . . . . . . . . . . . . . . . . . . 1–1

New AT Commands. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–4

Result Code Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–5

AT Command Descriptions . . . . . . . . . . . . . . . . . . . . . . 1–11

2 S-Registers

Setting S-Register Default Values . . . . . . . . . . . . . . . . . . 2–2

Modifying an S-Register . . . . . . . . . . . . . . . . . . . . . . . . . 2–2

Reading an S-Register . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–3

S-Register Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . 2–5

3 AT FAX Command Set

Class 1 FAX Commands . . . . . . . . . . . . . . . . . . . . . . . . . 3–1

AT FAX Command Set Descriptions . . . . . . . . . . . . . . . 3–2

4 V.25ter AT Command Set

5 V.80 AT Command Set

Lucent/Agere Command Set (Advanced Users Only) iii

Contents

A New V.250 Commands to Support V.92 AT

Command Set

+PMH Modem on Hold Enable. . . . . . . . . . . . . . . . . A–5

+PMHR Initiate Modem on Hold (MOH). . . . . . . . . A–7

+PIG PCM Upstream Ignore . . . . . . . . . . . . . . . . . . . A–8

+PQC V.92 Phase 1 and Phase 2 Control . . . . . . . . . A–9

+PMHF V.92 Modem Hook Flash . . . . . . . . . . . . . A–10

+DS44 V.44 Data Compression . . . . . . . . . . . . . . . A–10

iv Lucent/Agere Command Set (Advanced Users Only)

AT Command Set

AT Data Command Set Summary

Command Description Command Description

+++

Escape to online command mode

Data set ready (DSR) option

Answer command

Repeat last command

Communication standard setting

Carrier control

Dial command

Echo command

Online data character echo command

Hook control

Request ID information

Monitor speaker volume

&Zn=x

Self-test commands

View active configuration

Store current configuration

Select stored profile for hard reset

Store telephone number

MNP Block Size

Send Break

Modem port flow control

Adjust bits/s rate control

Data set ready (DSR) option

Lucent/Agere Command Set (Advanced Users Only) 1–1

AT Command Set

AT Data Command Set Summary

Command Description Command Description

Monitor speaker mode

Modulation handshake

Return to online data mode

Select pulse dialing

Result code control

Set or Query S-Register values

Select tone dialing

DCE response format

Result code option

Result code selection and call progress monitoring

-C

-V90

Self-test commands

Error control mode selection

Local flow control selection

Ring indicator off after answer

Inactivity timer

Protocol result code

XON/XOFF pass through

Data calling tone

Enable/disable V.90 settings

View numbers in blacklist

1–2 Lucent/Agere Command Set (Advanced Users Only)

Long-space disconnect

Reset and recall stored profile

V.32 auto retrain

Data carrier detect (DCD) control

Data compression control

Automatic rate change

Compression reporting

V.42bis

AT Command Set

AT Data Command Set Summary

Command Description Command Description

Data Terminal Ready (DTR) control

Local factory settings

V.22bis guard tone control

Auxiliary relay options

Local flow control selection

Asynchronous communications mode

Pulse dial make-to-break ration selection

IFC

ILRR

Error control reporting

Buffered mode

Flow control

DTE rate reporting

Modulation reporting

Modem carrier

Lucent/Agere Command Set (Advanced Users Only) 1–3

AT Command Set

New AT Commands

Command Description

+DS44+<direction>, <compression_negotiation>

+EB=<break selection>, <timed>,default length>

+ESA=<trans Idle>,<frame idle>,<framed un ov>,<hd auto>,<crc type>,<nrzi en>,<syn1>

+ESR=<value>

+ETBM=<pending_TD>, <pending_RD>,<timer>

+GCI+<T.35 country code>

+GMI

+GMM

+GMR

+IPR+<DTE rate>

+ITF+<off>,<on>

+PCW+<call_waiting>

+PIG+<value>

V.44 data compression

Break handling in error control operation

Set up error control parameters

Selective repeat

Call termination buffer management

Country of installation

Manufacturer identification

Modem identification

Request revision information

Fixed DTE rate

Transmit flow control threshold

Call waiting enable

PCM upstream ignore

+PMH+<value>

+PMHF

+PMHR

+PMHT+<value>

+PQC_<value>

+PSS+<value>

1–4 Lucent/Agere Command Set (Advanced Users Only)

Modem on hold enable

Modem on hold hook flash

Initiate modem on hold

Modem on hold timer

V.92 phase 1 and phase 2 control

Use short sequence

AT Command Set

Result Code Summary

Result Code Numeric Description

CONNECT 1 Modem connected to line

RING 2 A ring signal has been

NO CARRIER 3 Modem lost carrier signal, or

ERROR 4 Invalid command

CONNECT 1200 EC* 5 Connection at 1200 bits/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 bits/s

CONNECT 4800 EC* 11 Connection at 4800 bits/s

0 Command executed

detected

does not detect carrier signal, or does not detect answer tone

CONNECT 9600 EC* 12 Connection at 9600 bits/s

CONNECT 14400 EC* 13 Connection at 14400 bits/s

CONNECT 19200 EC* 14 Connection at 19200 bits/s

CONNECT 7200 EC* 24 Connection at 7200 bits/s

CONNECT 12000 EC* 25 Connection at 12000 bits/s

CONNECT 16800 EC* 86 Connection at 16800 bits/s

CONNECT 300 EC* 40 Connection at 300 bits/s

CONNECT 21600 EC* 55 Connection at 21600 bits/s

CONNECT 24000 EC* 56 Connection at 24000 bits/s

CONNECT 26400 EC* 57 Connection at 26400 bits/s

CONNECT 28800 EC* 58 Connection at 28800 bits/s

Lucent/Agere Command Set (Advanced Users Only) 1–5

AT Command Set

Result Code Summary

Result Code Numeric Description

CONNECT 31200 EC* 59 Connection at 31200 bits/s

CONNECT 33600 EC* 60 Connection at 33600 bits/s

CONNECT 38400 EC* 28 Connection at 38400 bits/s

CONNECT 57600 EC* 18 Connection at 57600 bits/s

CONNECT 115200 EC 87 Connection at 115200 bits/s

DELAYED 88 Delay is in effect for the

BLACKLISTED 89 Dialed number is blacklisted

OK 0 Command executed

CONNECT 1 Modem connected to line

RING 2 A ring signal has been

NO CARRIER 3 Modem lost carrier signal,

(Continued)

(DTE rate)

dialed number

detected

or does not detect carrier signal, or does not detect answer tone

ERROR 4 Invalid command

CONNECT 1200 EC* 5 Connection at 1200 bits/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 bits/s

CONNECT 4800 EC* 11 Connection at 4800 bits/s

CONNECT 9600 EC* 12 Connection at 9600 bits/s

1–6 Lucent/Agere Command Set (Advanced Users Only)

AT Command Set

Result Code Summary

Result Code Numeric Description

CONNECT 14400 EC* 13 Connection at 14400 bits/s

CONNECT 19200 EC* 14 Connection at 19200 bits/s

CONNECT 7200 EC* 24 Connection at 7200 bits/s

CONNECT 12000 EC* 25 Connection at 12000 bits/s

CONNECT 16800 EC* 86 Connection at 16800 bits/s

CONNECT 300 EC* 40 Connection at 300 bits/s

CONNECT 21600 EC* 55 Connection at 21600 bits/s

CONNECT 24000 EC* 56 Connection at 24000 bits/s

CONNECT 26400 EC* 57 Connection at 26400 bits/s

CONNECT 28800 EC* 58 Connection at 28800 bits/s

CONNECT 31200 EC* 59 Connection at 31200 bits/s

CONNECT 33600 EC* 60 Connection at 33600 bits/s

CONNECT 38400 EC* 28 Connection at 38400 bits/s

CONNECT 57600 EC* 18 Connection at 57600 bits/s

(Continued)

(DTE rate)

CONNECT 115200 EC 87 Connection at 115200 bits/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 bits/s

(K56flex mode) or V.90

CONNECT 34000 EC* 71 Connection at 34000

bits/sbits/s (K56flex mode)

Lucent/Agere Command Set (Advanced Users Only) 1–7

AT Command Set

Result Code Summary

Result Code Numeric Description

CONNECT 36000 EC* 72 Connection at 36000 bits/s

CONNECT 38000 EC* 73 Connection at 38000 bits/s

CONNECT 40000 EC* 74 Connection at 40000 bits/s

CONNECT 42000 EC* 75 Connection at 42000 bits/s

CONNECT 44000 EC* 76 Connection at 44000 bits/s

CONNECT 46000 EC* 77 Connection at 46000 bits/s

CONNECT 48000 EC* 78 Connection at 48000 bits/s

CONNECT 50000 EC* 79 Connection at 50000 bits/s

CONNECT 52000 EC* 80 Connection at 52000 bits/s

CONNECT 54000 EC* 81 Connection at 54000 bits/s

CONNECT 56000 EC* 82 Connection at 56000 bits/s

(Continued)

(K56flex mode) or V.90

(K56flex mode)

(K56flex mode) or V.90

(K56flex mode)

(K56flex mode) or V.90

(K56flex mode)

(K56flex mode) or V.90

(K56flex mode)

(K56flex mode) or V.90

(K56flex mode)

CONNECT 28000 EC* 100 Connection at 28000 bits/s

(V.90 mode)

CONNECT 29333 EC* 101 Connection at 29333 bits/s

(V.90 mode)

CONNECT 30666 EC* 102 Connection at 30666 bits/s

(V.90 mode)

CONNECT 33333 EC* 103 Connection at 33333 bits/s

(V.90 mode)

1–8 Lucent/Agere Command Set (Advanced Users Only)

AT Command Set

Result Code Summary

Result Code Numeric Description

CONNECT 34666 EC* 104 Connection at 34666 bits/s

CONNECT 37333 EC* 105 Connection at 37333 bits/s

CONNECT 38666 EC* 106 Connection at 38666 bits/s

CONNECT 41333 EC* 107 Connection at 41333 bits/s

CONNECT 42666 EC* 108 Connection at 42666 bits/s

CONNECT 45333 EC* 109 Connection at 45333 bits/s

CONNECT 46666 EC* 110 Connection at 46666 bits/s

CONNECT 49333 EC* 111 Connection at 49333 bits/s

CONNECT 50666 EC* 112 Connection at 50666 bits/s

(Continued)

(V.90 mode)

Lucent/Agere Command Set (Advanced Users Only) 1–9

AT Command Set

Result Code Summary

Result Code Numeric Description

CONNECT 53333 EC* 113 Connection at 53333 bits/s

CONNECT 54666 EC* 114 Connection at 54666 bits/s

*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:

■

V.42bis–V.42 error control and V.42bis data compression

■

V.42–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

(Continued)

(V.90 mode)

1–10 Lucent/Agere Command Set (Advanced Users Only)

AT Command Descriptions

+++ Escape Sequence

The escape sequence allows the modem to exit data mode and enter online command mode. While in online command mode, you may communicate directly to your modem using

commands. Once you are finished, you may return to data

ATO

mode using the

A pause, the length of which is set by the Escape Guard Time (

S12

), must be used 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.

command.

AT Command Set

Do not precede this command with an pressing

enter.

prefix or conclude it by

A Answer Command

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

A/ Repeat Last Command

This command repeats the last command string entered. Do not

precede this command with an pressing

Lucent/Agere Command Set (Advanced Users Only) 1–11

enter.

prefix or conclude it by

AT Command Set

Bn Communication Standard Setting

This command determines CCITT vs. Bell standard.

Selects CCITT V.22 mode when the modem is at 1200 bits/s.

Selects Bell 212A when the modem is at 1200 bits/s (default).

Deselects V.23 reverse channel (same as B3).

Deselects V.23 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 support the other modems to not send carrier (i.e., it puts them in a receive-only mode).

Transmit carrier always off.

Normal transmit carrier switching.

Result Codes

OK n = 1

ERROR Otherwise

1–12 Lucent/Agere Command Set (Advanced Users Only)

command. However, this modem does not

command. The C0 command may instruct some

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

A dial string can be up to 40 characters long. Any digit or symbol (0–9, *, #, A, B, C, D) may be dialed as touch-tone 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.

ATD

command.

AT Command Set

;

S=n

Redials last number. Should be the first character following

ATD,

ignored otherwise.

Pulse dialing.

Touch-tone dialing (default).

Pause during dialing. Pause for time specified in Register S8 before processing the next character in the dial string.

Wait for dial tone. Modem waits for a second dial tone before processing the dial string.

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.

Dial a telephone number previously stored using the command (see the The range of n is 0–3.

Bong tone detection.

&Zn=x

command for further information).

&Zn=x

Lucent/Agere Command Set (Advanced Users Only) 1–13

AT Command Set

En Echo Command

This command controls whether the characters entered from your computer keyboard are echoed back to your monitor while the modem is in command mode.

Disables echo to the computer.

Enables echo to the computer (default).

Result Codes

OK n = 0, 1

ERROR Otherwise

Fn Online Data Character Echo Command

This command determines whether the modem will echo data

from the DTE. This modem does not support the command. However, the modem will accept issued by older communication software, to assure backward compatibility.

version of the

F1,

which may be

Online data character echo enabled (NOT SUPPORTED, responds ERROR).

Online character echo disabled.

Result Codes

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.

Modem goes on-hook (default).

Modem goes off-hook.

1–14 Lucent/Agere Command Set (Advanced Users Only)

Result Codes

OK n = 0, 1

ERROR Otherwise

In Request ID Information

This command displays specific product information about the modem.

Returns default speed and controller firmware version, same as

Calculates ROM checksum and displays it on the DTE.

Performs a ROM check and calculates and verifies the checksum displaying OK or ERROR.

Returns the default speed and the controller firmware version, same as

Returns firmware version for data pump.

Returns the board ID: software version, hardware version, and country ID.

I3.

I0.

AT Command Set

Returns OK.

Returns country code (i.e., NA Ver. 1).

I11

Displays connection information as described in following table.

Result Codes

OK n = 0, 1, 2, 3, 4, 9

ERROR Otherwise

Lucent/Agere Command Set (Advanced Users Only) 1–15

AT Command Set

ATI11

The second page.

result has two pages; the user must hit a key to get the

K56flex

Description

1 Last Connection 56K V.90

2 Initial Transmit

Carrier Rate

3 Initial Receive Carrier

Rate

4 Final Transmit Carrier

Rate

5 Final Receive Carrier

Rate

6 Protocol Negotiation

Result

7 Data Compression

Result

8 Estimated Noise

Level

9 Receive Signal

Power Level (-dBm)

10 Transmit Signal

Power Level (-dBm)

Connection

28800 28800

50000 49333

28800 28800

50000 49333

LAPM LAPM

V42bis V42bis

152 152

25 25

16 16

V. 90 Connection

11 Round Trip Delay

(msec)

Press any key to continue; ESC to quit.

1–16 Lucent/Agere Command Set (Advanced Users Only)

AT Command Set

K56flex

Description

12 Near Echo Level

(-dBm)

13 Far Echo Level

(-dBm)

14 Transmit Frame

Count

15 Transmit Frame Error

Count

16 Receive Frame Count 0 0

17 Receive Frame Error

Count

18 Retrain by Local

Modem

19 Retrain by Remote

Modem

20 Call Termination

Cause

21 Robbed-Bit Signaling 00 00

22 Digital Loss (dB) 6 6

Connection

NA NA

V. 90 Connection

23 Remote Server ID 4342C3 NA

The

ATI11

command may be issued from online command mode or after the end of a call. After a call, some values are no longer valid; it is useful to know which ones. Each of the line items in

ATI11

the

result is explained next:

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

2. Initial upstream rate.

Lucent/Agere Command Set (Advanced Users Only) 1–17

AT Command Set

3. Initial downstream rate.

4. Current or final upstream rate.

5. Current or final downstream rate.

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

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

8. Mean-square error of received downstream signal. This is the difference between received constellation point and reference decision point. This is a dimensionless decimal number, only valid during a call. Higher numbers are worse. There is no absolute quality threshold; it depends on the downstream data rate. The number varies during a call, so it can be useful to sample a few times.

The received signal power, although labeled -dBm, is only a relative measure for comparing calls to/from different locations. Only valid during a call.

9. 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 the 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.

1–18 Lucent/Agere Command Set (Advanced Users Only)

AT Command Set

19. 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

20. 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 convention.

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

Ln Monitor Speaker Volume

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

Selects low volume.

Selects medium volume (default).

\N4,

for example.

Selects high volume.

Result Codes

OK n = 0, 1, 2, 3

ERROR Otherwise

Lucent/Agere Command Set (Advanced Users Only) 1–19

AT Command Set

Mn Monitor Speaker Mode

This command turns the speaker on or off.

The speaker is off.

The speaker is on until the modem detects the carrier signal (default).

The speaker is always on when modem is off-hook.

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.

When originating or answering, this is for handshake only

S37

at the communication standard specified by

ATB

command.

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

ATB

command. During handshake, fallback to a lower speed

and the

S37

and the

may occur (default).

Result Codes

OK n = 0, 1

ERROR Otherwise

1–20 Lucent/Agere Command Set (Advanced Users Only)

On Return Online to Data Mode

Instructs the modem to exit online command mode and return to data mode (see AT Escape Sequence, +++).

This command issues a retrain before returning to online data mode.

This command issues a rate renegotiation before returning to online 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 modifier is received. Tone dial is the default setting.

AT Command Set

command or dial

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.

Enables modem to send result codes to the computer (default).

Disables modem from sending result codes to the computer.

Result Codes

OK n = 0, 1

ERROR Otherwise

Lucent/Agere Command Set (Advanced Users Only) 1–21

AT Command Set

T Select Tone Dialing

This command instructs the modem to send DTMF tones while dialing. Dialed digits are tone dialed until a 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 the “Result Code Summary” section of this document.

Displays result codes as digits.

Displays result codes as text (default).

Result Codes

OK n = 0, 1

ERROR Otherwise

command or dial

ATV0 ATV1

Result Code Format

Wn Result Code Option

CONNECT result code reports DTE speed. Disable protocol result codes.

CONNECT result code reports DTE speed. Enable protocol result codes.

CONNECT result code reports DCE receive speed. Enable protocol result codes (default).

1–22 Lucent/Agere Command Set (Advanced Users Only)

AT Command Set

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 result codes of the modem chip set are also affected. Therefore, this command is frequently used to control the responses of the modem chip set.

Extension Result Code

Dial Tone Detect

Busy Tone Detect

Disable Disable Disable

Enable Disable Disable

Enable Enable Disable

Enable Disable Enable

Enable Enable Enable (default)

Enable Enable Enable

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.

Lucent/Agere Command Set (Advanced Users Only) 1–23

AT Command Set

Dial Tone Detect

Disabled: The modem dials a call regardless of whether it

detects a dial tone. The period of time the modem waits before dialing is specified in Register S6.

Enabled: The modem dials only upon detection of a dial

tone, and disconnects the call if the dial tone is not detected within 10 seconds.

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

Yn Long Space Disconnect

Long space disconnect is always disabled.

Disables long space disconnect (default).

Enables long space disconnect—NOT SUPPORTED.

Result Codes

OK n = 0

ERROR Otherwise

1–24 Lucent/Agere Command Set (Advanced Users Only)

Zn Recall Stored Profile

This command instructs the modem chip set to go on-hook and restore the profile saved by the last restores the same single profile.

Result Codes

OK n = 0, 1

ERROR Otherwise

&Bn V.32 Auto Retrain

This modem always auto retrains.

&B0

Disables V.32 auto retrain—NOT SUPPORTED.

&B1

Enables V.32 auto retrain (default).

Result Codes

OK n = 1

AT Command Set

command. Either Z0 or Z1

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).

Lucent/Agere Command Set (Advanced Users Only) 1–25

AT Command Set

Result Codes

OK n = 0, 1

ERROR Otherwise

&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 online data mode, the modem enters command mode, issues OK result code, and remains connected.

&D2

If the DTR signal is not detected while in online data mode, the modem disconnects (default).

&D3

Reset 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 values.

1–26 Lucent/Agere Command Set (Advanced Users Only)

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