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277662-001.book  Page i  Friday, January 11, 2002  5:15 PM

b
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.

277662-001.book  Page ii  Friday, January 11, 2002  5:15 PM

© 2002 Compaq Information Technologies Group, L.P.
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

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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 . . . . . . . . . . . . . . . . . .
Modifying an S-Register . . . . . . . . . . . . . . . . . . . . . . . . .
Reading an S-Register . . . . . . . . . . . . . . . . . . . . . . . . . . .
S-Register Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . .

2–2
2–2
2–3
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

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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)

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1
AT Command Set
A

AT Data Command Set Summary
Command

Description

Command

Description

+++

Escape to online
command mode

&S

Data set ready
(DSR) option

A

Answer command

&T

Self-test
commands

A/

Repeat last
command

&V

View active
configuration

B

Communication
standard setting

&W

Store current
configuration

C

Carrier control

&Y

Select stored
profile for hard
reset

D

Dial command

&Zn=x

Store telephone
number

E

Echo command

\A

MNP Block Size

F

Online data
character echo
command

\B

Send Break

H

Hook control

\G

Modem port flow
control

I

Request ID
information

\J

Adjust bits/s rate
control

L

Monitor speaker
volume

&S

Data set ready
(DSR) option

Lucent/Agere Command Set (Advanced Users Only)

1–1

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AT Command Set

AT Data Command Set Summary

1–2

Command

Description

Command

Description

M

Monitor
speaker mode

&T

Self-test
commands

N

Modulation
handshake

\N

Error control mode
selection

O

Return to online
data mode

\Q

Local flow control
selection

P

Select pulse
dialing

\R

Ring indicator off
after answer

Q

Result code
control

\T

Inactivity timer

S

Set or Query
S-Register values

\V

Protocol
result code

T

Select tone dialing

\X

XON/XOFF pass
through

V

DCE response
format

-C

Data calling tone

W

Result code option

-V90

Enable/disable
V.90 settings

X

Result code
selection and call
progress
monitoring

%B

View numbers in
blacklist

Y

Long-space
disconnect

%C

Data compression
control

Z

Reset and recall
stored profile

%E

Automatic rate
change

&B

V.32 auto retrain

DR

Compression
reporting

&C

Data carrier detect
(DCD) control

DS

V.42bis

Lucent/Agere Command Set (Advanced Users Only)

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AT Command Set

AT Data Command Set Summary
Command

Description

Command

Description

&D

Data Terminal
Ready (DTR)
control

ER

Error control
reporting

&F

Local factory
settings

ES

Buffered mode

&G

V.22bis guard tone
control

IFC

Flow control

&J

Auxiliary relay
options

ILRR

DTE rate reporting

&K

Local flow control
selection

MR

Modulation
reporting

&M

Asynchronous
communications
mode

MS

Modem carrier

&P

Pulse dial
make-to-break
ration selection

Lucent/Agere Command Set (Advanced Users Only)

1–3

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AT Command Set

\

New AT Commands
Command

1–4

Description

+DS44+,


V.44 data compression

+EB=,
,default length>

Break handling in error control
operation

+ESA=,,,,,,

Set up error control parameters

+ESR=

Selective repeat

+ETBM=,
,

Call termination buffer
management

+GCI+

Country of installation

+GMI

Manufacturer identification

+GMM

Modem identification

+GMR

Request revision information

+IPR+

Fixed DTE rate

+ITF+,

Transmit flow control threshold

+PCW+

Call waiting enable

+PIG+

PCM upstream ignore

+PMH+

Modem on hold enable

+PMHF

Modem on hold hook flash

+PMHR

Initiate modem on hold

+PMHT+

Modem on hold timer

+PQC_

V.92 phase 1 and phase 2 control

+PSS+

Use short sequence

Lucent/Agere Command Set (Advanced Users Only)

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AT Command Set

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 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

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

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AT Command Set

Result Code Summary (Continued)
Result Code

1–6

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
(DTE rate)

CONNECT 57600 EC*

18

Connection at 57600 bits/s
(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

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 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

Lucent/Agere Command Set (Advanced Users Only)

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AT Command Set

Result Code Summary (Continued)
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
(DTE rate)

CONNECT 57600 EC*

18

Connection at 57600 bits/s
(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

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AT Command Set

Result Code Summary (Continued)
Result Code

1–8

Numeric

Description

CONNECT 36000 EC*

72

Connection at 36000 bits/s
(K56flex mode) or V.90

CONNECT 38000 EC*

73

Connection at 38000 bits/s
(K56flex mode)

CONNECT 40000 EC*

74

Connection at 40000 bits/s
(K56flex mode) or V.90

CONNECT 42000 EC*

75

Connection at 42000 bits/s
(K56flex mode)

CONNECT 44000 EC*

76

Connection at 44000 bits/s
(K56flex mode) or V.90

CONNECT 46000 EC*

77

Connection at 46000 bits/s
(K56flex mode)

CONNECT 48000 EC*

78

Connection at 48000 bits/s
(K56flex mode) or V.90

CONNECT 50000 EC*

79

Connection at 50000 bits/s
(K56flex mode)

CONNECT 52000 EC*

80

Connection at 52000 bits/s
(K56flex mode) or V.90

CONNECT 54000 EC*

81

Connection at 54000 bits/s
(K56flex mode)

CONNECT 56000 EC*

82

Connection at 56000 bits/s
(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)

Lucent/Agere Command Set (Advanced Users Only)

277662-001.book  Page 9  Friday, January 11, 2002  5:15 PM

AT Command Set

Result Code Summary (Continued)
Result Code

Numeric

Description

CONNECT 34666 EC*

104

Connection at 34666 bits/s
(V.90 mode)

CONNECT 37333 EC*

105

Connection at 37333 bits/s
(V.90 mode)

CONNECT 38666 EC*

106

Connection at 38666 bits/s
(V.90 mode)

CONNECT 41333 EC*

107

Connection at 41333 bits/s
(V.90 mode)

CONNECT 42666 EC*

108

Connection at 42666 bits/s
(V.90 mode)

CONNECT 45333 EC*

109

Connection at 45333 bits/s
(V.90 mode)

CONNECT 46666 EC*

110

Connection at 46666 bits/s
(V.90 mode)

CONNECT 49333 EC*

111

Connection at 49333 bits/s
(V.90 mode)

CONNECT 50666 EC*

112

Connection at 50666 bits/s
(V.90 mode)

Lucent/Agere Command Set (Advanced Users Only)

1–9

277662-001.book  Page 10  Friday, January 11, 2002  5:15 PM

AT Command Set

Result Code Summary (Continued)
Result Code

Numeric

Description

CONNECT 53333 EC*

113

Connection at 53333 bits/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:

1–10

■

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

Lucent/Agere Command Set (Advanced Users Only)

277662-001.book  Page 11  Friday, January 11, 2002  5:15 PM

AT Command Set

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
AT commands. Once you are finished, you may return to data
mode using the ATO command.
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.
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.

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.

Lucent/Agere Command Set (Advanced Users Only)

1–11

277662-001.book  Page 12  Friday, January 11, 2002  5:15 PM

AT Command Set

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

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

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

Cn

OK

n = 0, 1, 2, 3, 15, 16

ERROR

Otherwise

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 to not send carrier (i.e., it puts them in a
receive-only mode).
C0

Transmit carrier always off.

C1

Normal transmit carrier switching.

Result Codes

1–12

OK

n=1

ERROR

Otherwise

Lucent/Agere Command Set (Advanced Users Only)

277662-001.book  Page 13  Friday, January 11, 2002  5:15 PM

AT Command Set

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 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.
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.

@

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.

Lucent/Agere Command Set (Advanced Users Only)

1–13

277662-001.book  Page 14  Friday, January 11, 2002  5:15 PM

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.
E0

Disables echo to the computer.

E1

Enables echo to the computer (default).

Result Codes

Fn

OK

n = 0, 1

ERROR

Otherwise

Online Data Character Echo Command
This command determines whether 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,
responds ERROR).

F1

Online character echo disabled.

Result Codes

Hn

OK

n=1

ERROR

Otherwise

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

1–14

H0

Modem goes on-hook (default).

H1

Modem goes off-hook.

Lucent/Agere Command Set (Advanced Users Only)

277662-001.book  Page 15  Friday, January 11, 2002  5:15 PM

AT Command Set

Result Codes

In

OK

n = 0, 1

ERROR

Otherwise

Request ID Information
This command displays specific product information about the
modem.
I0

Returns default speed and controller firmware version,
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 the default speed and the controller firmware
version, same as I0.

I4

Returns firmware version for data pump.

I5

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

I6

Returns OK.

I7

Returns OK.

I8

Returns OK.

I9

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

277662-001.book  Page 16  Friday, January 11, 2002  5:15 PM

AT Command Set

The ATI11 result has two pages; the user must hit a key to get the
second page.
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.

1–16

Lucent/Agere Command Set (Advanced Users Only)

277662-001.book  Page 17  Friday, January 11, 2002  5:15 PM

AT Command Set

Description

K56flex
Connection

V.90
Connection

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 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
the ATI11 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)

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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)

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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 \N4, for example.
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.
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

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AT Command Set

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

Nn

OK

n = 0, 1, 2, 3

ERROR

Otherwise

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

1–20

OK

n = 0, 1

ERROR

Otherwise

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AT Command Set

On

Return Online to Data Mode
O0

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

O1

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

O3

This command issues a rate renegotiation before returning
to online data mode.

Result Codes

P

OK

n = 0, 1, 3

ERROR

Otherwise

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

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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 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 the “Result Code Summary” section of
this document.
V0

Displays result codes as digits.

V1

Displays result codes as text (default).

Result Codes
OK

n = 0, 1

ERROR

Otherwise

Result
Code
Format

ATV0

ATV1







Wn Result Code Option

1–22

W0

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

W1

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

W2

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

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AT Command Set

Result Codes

Xn

OK

n = 0, 1, 2

ERROR

Otherwise

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

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.

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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

Yn

OK

n = 0, 1, 2, 3, 4, 5, 6, 7

ERROR

Otherwise

Long Space Disconnect
Long space disconnect is always disabled.
Y0

Disables long space disconnect (default).

Y1

Enables long space disconnect—NOT SUPPORTED.

Result Codes

1–24

OK

n=0

ERROR

Otherwise

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AT Command Set

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

Disables V.32 auto retrain—NOT SUPPORTED.

&B1

Enables 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).

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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

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AT Command Set

&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.

&J1

NOT SUPPORTED, responds ERROR.

Result Codes
OK

n=0

ERROR

Otherwise

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AT Command Set

&Kn Local Flow Control Selection
&K0

Disables flow control.

&K1

Reserved.

&K2

Reserved.

&K3

Enables RTS/CTS flow control (default).

&K4

Enables 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

1–28

OK

n=0

ERROR

Otherwise

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AT Command Set

&Pn Pulse Dial Make-to-Break Ration Selection
&P0

39/61 make/break ratio, 10PPS.

&P1

33/67 make/break ratio, 10PPS (default).

&P2

33/67 make/break ratio, 20PPS.

&P3

Reserved.

&P4

Reserved.

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 fall back according to
the current user setting in S36.

&Q9

V.42 or MNP error control mode. If either error control
protocol is established, the modem will fall back 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 Set

&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.

1–30

&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 offline.

&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 online with error control
disabled.

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AT Command Set

Result Codes
OK

n=0

CONNECT n = 1, 3, 6
ERROR

&V

Otherwise

View Active Configuration and Stored
Profile
This command is used to display the active profiles.
&V0

View active file.

For example:
Option

Selection

AT Command

Comm Standard

Bell

B

CommandCharEcho

Enabled

E

Speaker Volume

Medium

L

Speaker Control

OnUntilCarrier

M

Result Codes

Enabled

Q

Dialer Type

Tone

T/P

Result Code Form

Text

V

Extend Result Code

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.

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AT Command Set

Option

Selection

AT Command

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.

1–32

Option

Selection

AT Command

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

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AT Command Set

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

OK

&Wn Store Current Configuration
This command stores certain command options and S-register
values into the nonvolatile memory of the modem. 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

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AT Command Set

&Zn=x Store Telephone Number
This command is used to store up to four dialing strings in the
nonvolatile memory of the modem 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–\B9Break length in 100ms units. (Default = 3;
non-error-control mode only.)

1–34

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AT Command Set

Result Codes
OK

If connected in data modem mode.

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

\Gn Modem Port Flow Control
\G0

Returns an “OK” for compatibility (default).

\G1

NOT SUPPORTED, responds ERROR.

Result Codes

\J

OK

n=0

ERROR

Otherwise

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 speed of the modem.
\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, 1

ERROR

Otherwise

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AT Command Set

\K

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 online command mode, no break sent to remote
modem.

\K1

Clear data buffers and send break to remote modem.

\K2

Same as \K0.

\K3

Send break to remote modem immediately.

\K4

Same as \K0.

\K5

Send break to remote modem in sequence with transmitted
data (default).

The second case is where the modem is in the online 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:

1–36

\K0

Clear data buffers and send break to remote modem.

\K1

Clear data buffers and send break to remote modem.
Same as \K0.

\K2

Send break to remote modem immediately.

\K3

Send break to remote modem immediately. Same as \K2.

\K4

Send break to remote modem in sequence with
transmitted data.

\K5

Send break to remote modem in sequence with transmitted
data. Same as \K4; default.

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AT Command Set

The third case is where there is a break 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 \K0.

\K2

Send break immediately to DTE.

\K3

Send break immediately to DTE. Same as \K2.

\K4

Send break in sequence with received data to DTE.

\K5

Send break in sequence with received data to DTE.
Same as \K4; 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.

\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.

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AT Command Set

\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

\Qn 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

1–38

OK

n=0

ERROR

Otherwise

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AT Command Set

\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

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AT Command Set

\Xn XON/XOFF Pass Through
\X0

Modem processes XON/XOFF flow control characters
locally (default).

\X1

Modem processes and 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.
-CO

Disabled (default).

-C1

Enabled.

Result Codes

1–40

OK

n = 0, 1

ERROR

Otherwise

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AT Command Set

-V90= Command to enable/disable V.90 and
change downstream rate
-V90=0

Disables V.90.

-V90=1

Enables V.90 Auto Rate (default value).

-V90=n

Controls the downstream rate.

-V90?

Shows the current value.

-V90=?

Shows the range [0–21].

The table below shows the possible values of n.
AT-V90=n

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

(Continued)

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AT Command Set

AT-V90=n

Downstream Rate

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.

%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

1–42

OK

n = 0, 1

ERROR

Otherwise

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AT Command Set

%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

Disables fallback/fall forward.

%E1

Enables fallback/disable fall forward.

%E2

Enables fallback/fall forward (default).

Result Codes
OK

n = 0, 1, 2

ERROR

Otherwise

VDR Distinctive Ring and Cadence Report
This command enables the distinctive ring feature which allows a
report of DROF/DRON to follow an exact ring cadence sent over
the phone line.
VDR?

Returns the current values of  and
/.

VDR+?

Queries the DCE for the range of supported
distinctive ring configurations.

DCE returns:

(0,1), (0-255)

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2
S-Registers
Setting S-Register Default Values
The S-register default values function reliably under most
circumstances. However, these values may be modified if
necessary.
For example, it may take an especially long time to get a dial
tone in your office, so you may choose to reset S7 for a
longer wait time.

Modifying an S-Register
You can modify or change the value of an S-register from
Command Mode (Terminal Mode) or from a standard data or fax
communication application. For example:
■

Type ATS11=70, then press enter.

■

This sets S11 to a value of 70.

■

If you then enter AT = 95, it resets S11 to a value of 95 since the
modem remembered that S11 was the last register referenced.

■

If you enter an S = command with no parameter (value), the
register number defaults to zero and the modem changes the
value of S0. Therefore, the following commands are
equivalent: ATS0 = 3 and ATS = 3.

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S-Registers

Reading an S-Register
To read the contents of a given S-register in the Terminal Mode
(Command Mode), type ATSn? (where n is the number of the
register), then press enter.
When modifying a register, the modem also remembers the
location of the last inquiry. For example, the following sequence
of commands display the contents of the S11 register:
ATS11?

This command displays the value of S11.

AT?

This command also displays the value of S11.

When you use an S? with no value, the register number defaults to
zero and the modem responds with the value of S0 (for example
ATS?).

2–3

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

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S-Registers

Register

Default

Description

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

Synthetic ring volume

S33

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
Read-only local phone

S90
S91

15

Line transmit level

S108

7

Network codec type

S109

Enable

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

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S-Registers

S-Register Descriptions
S0

Auto Answer Ring Number
This register determines the number of rings the modem will
count before automatically answering a call. Enter 0 (zero) if you
do not want the modem to automatically answer at all. When
disabled, the modem can only answer with an ATA command.
Range:

0-255

Default: 0
Units:

S1

Rings

Ring Counter
This register is read-only. The value of S1 is incremented with
each ring. If no rings occur over a six second interval, this register
is cleared.
Range:

0-255

Default: 0
Units:

S2

Rings

AT Escape Character (user defined)
This register determines the ASCII value used for an escape
sequence. The default is the + character. The escape sequence
allows the modem to exit data mode and enter command mode
when online. Values greater than 127 disable the escape
sequence.
Range:

0-255

Default: 43
Units:

2–5

ASCII

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S-Registers

S3

Command Line Termination Character
(user defined)
This register determines the ASCII values as the carriage return
character. This character is used to end command lines and result
codes.
Range:

0-127, ASCII decimal

Default: 13 (carriage return)
Units:

S4

ASCII

Response Formatting Character
(user defined)
This register determines the ASCII value used as the line feed
character. The modem uses a line feed character in command
mode when it responds to the computer.
Range:

0-127, ASCII decimal

Default: 10 (line feed)
Units:

ASCII

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S-Registers

S5

Command Line Editing Character
(user defined)
This register sets the character recognized as a backspace and
pertains to asynchronous 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 the
backspace character, an ASCII space character, and a second
backspace character back to the local DTE. This means a total of
three characters are transmitted each time the modem processes
the backspace character.
Range:

0-127, ASCII decimal

Default: 8 (backspace)
Units:

S6

ASCII

Wait Before Dialing
This register sets the length of time, in seconds, that the modem
must wait after going off-hook before dialing the first digit of the
telephone number. The modem always pauses for a minimum of
two seconds, even if the value of S6 is less than two seconds. The
wait for dial tone call progress feature (W dial modifier in the dial
string) will override the value in Register S6. This operation,
however, may be affected by some ATX options according to
country restrictions.
Range:

2-65

Default: 2
Units:

2–7

Seconds

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S-Registers

S7

Connection Completion Time-Out
This register sets the time, in seconds, that the modem must wait
before hanging up because carrier is not detected. The timer is
started when the modem finishes dialing (originate), or goes
off-hook (answer). In originate mode, the timer is reset upon
detection of an answer tone if allowed by country restriction.
The timer also specifies the wait for silence time for the @
dial modifier in seconds. S7 is not associated with the W dial
modifier.
Range:

1-255

Default: 50
Units:

S8

Seconds

Comma Dial Modifier Time
This register sets the time, in seconds, that the modem must pause
when it encounters a comma (,) in the dial command string.
Range:

0-65

Default: 2
Units:

Seconds

S10 Automatic Disconnect Delay
This register 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.
The actual interval the modem waits before disconnecting is the
value in Register S10.
Range:

1-254

Default: 20
Units:

.1 seconds

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S-Registers

S11 DTMF Dialing Speed
This register determines the dialing speed which is prefixed for
each country.
Range:

50-150

Default: 95
Units:

.001 seconds

S12 Escape Guard Time
This register sets the value (in 20 ms increments) for the required
pause after the escape sequence (default 1 s).
Range:

0-255

Default: 50
Units:

.02 seconds

S14 General Bit Mapped Options Status
Indicates the status of command options. Only bit 3 and bit 6 are
used, read-only.
Bit 3

Result codes (Vn)

0

Numeric (V0)

1

Verbose (V1) (Default)

Bit 6

Pulse dial PPS selection (&Pn)

0

10 PPS (&P0, &P1) (Default)

1

20 PPS (&P2)

Default: 8 (00001000b)

2–9

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S-Registers

S21 V.24/General Bit Mapped Options Status
Indicates the status of command options. Only bits 3, 4, and 5 are
used, read-only.
Bits 3-4

DTR behavior (&Dn)

0

&D0 selected

1

&D1 selected

2

&D2 selected (Default)

3

&D3 selected

Bit 5

DCD behavior (&Cn)

0

&C0 selected

1

&C1 selected (Default)

Default: 48 (00110000b)

S22 Results Bit Mapped Options Status
Indicates the status of command options. Only bits 4, 5, and 6 are
used, read only.
Bits 4-6

Result codes (Xn)

0

X0 selected

4

X1 selected

5

X2 selected

6

X3 selected

7

X4 selected (Default)

Bit 7

Pulse dial make/break ratio (&Pn)

0

33/67 make/break ratio (&P1, &P2) (Default)

1

39/61 make/break ratio (&P0)

Default: 112 (01110000b)

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S-Registers

S24 Timer to Control Sleep Mode
This command displays the number of seconds of inactivity (no
characters sent from DTE, no RING) in the off-line command
state before the modem places itself into standby mode. A value
of zero prevents standby mode. S24 is an alias for S89.
number between 1 and 4 is entered for this register, it will set
✎ Ifthea value
to 5, and the inactivity before standby will be 5 seconds.

This is done for compatibility with previous products that allowed
time-outs down to one second.
Range:

0, 5-255

Default: 10
Units:

Seconds

S28 V.34 Modulation Enable/Disable
This register enables/disables V.34 modulation.
0 = disabled, 1-255 = enabled
Range:

0-255

Default: 1

S30 Inactivity Timer
S30 specifies the length of time (in minutes) that the modem will
wait before disconnecting when no data is sent or received. This
function is only applicable to buffer mode.

Range:

0-255

Default: 0
Units:

2–11

Minutes

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S-Registers

S35 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.
0 = disabled, 1 = enabled
Range:

0-1

Default: 0

S36 Negotiation Fallback
This is a non-operational command that is included for
compatibility with older programs. Use the \N command to
change EC protocol behavior.

S37 Dial Line Rate (default 0)
This register sets the maximum line data rate. In K56flex and
V.90 mode, S37 controls the upstream V.34 rate.
S37 = 0

Auto rate

S37 = 1

Reserved

S37 = 2

1200/75 bits/s

S37 = 3

300 bits/s

S37 = 4

Reserved

S37 = 5

1200 bits/s

S37 = 6

2400 bits/s

S37 = 7

4800 bits/s

S37 = 8

7200 bits/s

S37 = 9

9600 bits/s

S37 = 10

12000 bits/s

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S-Registers

S37 = 11

14400 bits/s

S37 = 12

16800 bits/s

S37 = 13

19200 bits/s

S37 = 14

21600 bits/s

S37 = 15

24000 bits/s

S37 = 16

26400 bits/s

S37 = 17

28800 bits/s

S37 = 18

31200 bits/s

S37 = 19

33600 bits/s

S38 K56flex Downstream Rate
To force a particular K56flex downstream rate, use Register S38.
S38 = 0 disables K56flex, and may allow a more reliable V.34
connection. S38 = 1 default allows the modem to select the
downstream rate automatically. Other values of S38 force the
downstream rate, with fallback to V.34 if unsuccessful at the
configured rate:

2–13

S38 = 0

56K disabled

S38 = 1

56K enabled—automatic rate selection (default)

S38 = 2

32000 bits/s

S38 = 3

34000 bits/s

S38 = 4

36000 bits/s

S38 = 5

38000 bits/s

S38 = 6

40000 bits/s

S38 = 7

42000 bits/s

S38 = 8

44000 bits/s

S38 = 9

46000 bits/s

S38 = 10

48000 bits/s

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S-Registers

S38 = 11

50000 bits/s

S38 = 12

52000 bits/s

S38 = 13

54000 bits/s

S38 = 14

56000 bits/s

The following chart shows how the number of robbed-bit
signaling (RBS) frames detected decreases the true DCE rate.
RBS Links

Rate Hit (kbit/s)

0

0

1

2

2

4

3

4

4

6

5

8

6

8

For example, if S38 = 10 and there are 3 RBS links, the K56flex
downstream rate will be 48–4 = 44 kbit/s. The exception is for
32 kbit/s and 34 kbit/s, which are the true rates regardless of
RBS frames detected.

S42 Auto Rate
This command is used for testing and debugging only.
V.32bis and V.22bis auto rate is disabled. Retrain operation is
disabled or enabled in data mode, and fallback is disabled in
data mode.
0 = auto rate disabled, 1 = enabled.
Range:

0-1

Default: 1

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S-Registers

S43 Auto Mode
This command is used for testing and debugging only.
V.32bis startup auto mode operation disabled.
0 = auto mode disabled, 1 = enabled.
Range:

0-1

Default: 1

S48 LAPM Error Control and Feature
Negotiation (default 7)
This is a non-operational command that is included for
compatibility with older programs. Use the \N command to
change EC protocol behavior.

S89 Timer to Control Sleep Mode
This command displays the number of seconds of inactivity (no
characters sent from the DTE, no RING) in the offline command
state before the modem places itself into standby mode. A value
of zero prevents standby mode.
number between 1 and 4 is entered for this register, it will set
✎ Ifthea value
to 5, and the inactivity before standby will be 5 seconds.

This is done for compatibility with previous products that allowed
time-outs down to one second.
Range:

0, 5-255

Default: 10

2–15

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S-Registers

S91 Line Transmit Level
This register is effective only for Japan. It specifies the line
transmit level in dBm with an implied minus sign.
Range:

6-15

Default: 15
Unites:

1dB

S108 Network Codec Type
S108 = 22 U-Law
S108 = 33 A-law
S108 = 7

Default, or any other value

coding is as specified by digital modem in V.8bis
✎ This
information. If an old server does not tell its code type in V.8bis,
then the client modem chooses based on its country ID. U-law
regions are Japan, Taiwan, Korea, Hong Kong, North America,
and Latin America. Everywhere else is A-law. This S-register is
valid only in K56flex mode.

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3
AT FAX Command Set
Class 1 FAX Commands
The Lucent Technologies HSM Data/FAX Complete Chip Set
supports FAX commands conforming to EIA standard 578. These
commands are given here with short descriptions; complete
explanations are given in the standard, available from the
Electronic Industry Association.
AT FAX Command Set Summary
Command

Description

+FCLASS?

Service class indication

+FCLASS=?

Service class capabilities

+FCLASS=n

Service class selection

+FTS=

Transmission silence

+FRS=

Receive silence

+FTM=

Transmit FAX data with  carrier

+FRM=

Receive FAX data with  carrier

+FTH=

Transmit HDLC data with  carrier

+FRH=

Receive HDLC data with  carrier

+FTM=?

Transmit FAX modulation

+FRM=?

Receive FAX modulation

+FTH=?

Transmit HDLC data modulation

+FRH=?

Receive HDLC data modulation

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AT FAX Command Set

AT FAX Command Set Summary (Continued)
Command

Description

+FMI?

Manufacturer identification

+FMM?

Product identification

+FMR?

Version/revision information

+FPR=

Set DTE-DCE fax port rate

+FPR=

Reports all fax port rate that DCE supports

+FPR?

Reports the current fax port rate of DTE-DCE

+FAA=

Set DCE adaptive answer mode

+FAA=?

Display valid adaptive answer values that DCE
supports

+FAA?

Display current set value of adaptive answer mode

+FLO+


Flow control selection

AT FAX Command Set Descriptions
+FCLASS? Service Class Indication
This command causes the modem to display the current setting.
The modem can operate either as a Class 0 data modem or a
Class 1 FAX modem.
Typical responses:
+FCLASS?

3–2

000 if in data mode; 001 if in FAX Class 1.

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AT FAX Command Set

+FCLASS=?Service Class Capabilities
This command causes the modem to display the classes it
supports.
Typical responses:
+FCLASS=?

0, 1

+FCLASS=nService Class Selection
This command sets the modem for Class n operation, where n is
either a 0 or 1.
Parameters:

0, 1

Default:

0

Command options:
+FCLASS=0

Select data mode.

+FCLASS=1

Select facsimile Class 1.

+FTS= Transmission Silence
This command causes the modem to stop transmitting data and
pause for 10*n ms. At the end of this period, the modem then
responds OK. You can specify any number from 0 through 255
as the value of n; for example, a value of 5 specifies a period of
50 ms.
n = 0-255 (10 ms intervals)

+FRS= Receive Silence
This command causes the modem to listen and wait for a 10*n ms
period of silence on the line. At the end of this period, the modem
then responds OK. You can specify any number from 0 through
255 as the value of n; for example, a value of 5 specifies a period
of 50 ms.
n = 0-255 (10 ms intervals)

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AT FAX Command Set

+FTM= Transmit FAX Data with  Carrier
This command causes the modem to transmit data at the
modulation specified by . The following chart shows the
values you can enter for this command and the meaning of those
values.

3–4

Command Option

Modulation

Speed (bits/s)

+FTM=3

V.21 Channel 2

300

+FTM=24

V.27ter

2400

+FTM=48

V.27ter

4800

+FTM=72

V.29

7200

+FTM=96

V.29

9600

+FTM=73

V.17

7200

+FTM=74

V.17 (short train)

7200

+FTM=97

V.17

9600

+FTM=98

V.17 (short train)

9600

+FTM=121

V.17

12000

+FTM=122

V.17 (short train)

12000

+FTM=145

V.17

14400

+FTM=146

V.17 (short train)

14400

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AT FAX Command Set

+FRM= Receive FAX Data with  Carrier
This command causes the modem to receive data at the
modulation specified by .
Command Option

Modulation

Speed (bits/s)

+FRM=3

V.21 Channel 2

300

+FRM=24

V.27ter

2400

+FRM=48

V.27ter

4800

+FRM=72

V.29

7200

+FRM=96

V.29

9600

+FRM=73

V.17

7200

+FRM=74

V.17 (short train)

7200

+FRM=97

V.17

9600

+FRM=98

V.17 (short train)

9600

+FRM=121

V.17

12000

+FRM=122

V.17 (short train)

12000

+FRM=145

V.17

14400

+FRM=146

V.17 (short train)

14400

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AT FAX Command Set

+FTH= Transmit HDLC Data with 
Carrier
This command causes the modem to transmit data framed in the
HDLC protocol at the modulation specified by .

3–6

Command Option

Modulation

Speed (bits/s)

+FTH=3

V.21 Channel 2

300

+FTH=24

V.27ter

2400

+FTH=48

V.27ter

4800

+FTH=72

V.29

7200

+FTH=96

V.29

9600

+FTH=73

V.17

7200

+FTH=74

V.17 (short train)

7200

+FTH=97

V.17

9600

+FTH=98

V.17 (short train)

9600

+FTH=121

V.17

12000

+FTH=122

V.17 (short train)

12000

+FTH=145

V.17

14400

+FTH=146

V.17 (short train)

14400

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AT FAX Command Set

+FRH= Receive HDLC Data with  Carrier
This command causes the modem to receive data framed in the
HDLC protocol at the modulation specified by .
Command Option

Modulation

Speed (bits/s)

+FRH=3

V.21 Channel 2

300

+FRH=24

V.27ter

2400

+FRH=48

V.27ter

4800

+FRH=72

V.29

7200

+FRH=96

V.29

9600

+FRH=73

V.17

7200

+FRH=74

V.17 (short train)

7200

+FRH=97

V.17

9600

+FRH=98

V.17 (short train)

9600

+FRH=121

V.17

12000

+FRH=122

V.17 (short train)

12000

+FRH=145

V.17

14400

+FRH=146

V.17 (short train)

14400

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AT FAX Command Set

+FPR= Select Fax Port Rate
This command sets the DTE to DCE fax port rate.

3–8

DTE Command

DCE Action

Description or Notes

+FPR=0

Execute +IPR=0

Select automatic rate
detection

+FPR=1

Execute +IPR=2400

Set DTE-DCE to
2400 bit/s

+FPR=2

Execute +IPR=4800

Set DTE-DCE to
4800 bit/s

+FPR=4

Execute +IPR=9600

Set DTE-DCE to
9600 bit/s

+FPR=8

Execute +IPR=19200

Set DTE-DCE to
19200 bit/s

+FPR=10

Execute +IPR=38400

Set DTE-DCE to
38400 bit/s

+FPR=18

Execute +IPR=57600

Set DTE-DCE to
57600 bit/s

+FPR=? (if all
values listed
above are
supported)

Report
(0,1,2,4,8,10,18)

DCE supports 2400,
4800, 9600, 19200,
38400, and 57600 bit/s

+FPR? (if
+IPR=0)

Report 0

DTE-DCE rate is
automatically detected

+FPR? (if
+IPR=2400)

Report 1

DTE-DCE rate is
2400 bit/s

+FPR? (if
+IPR=4800)

Report 2

DTE-DCE rate is
4800 bit/s

+FPR? (if
+IPR=9600)

Report 4

DTE-DCE rate is
9600 bit/s

+FPR? (if
+IPR=19200)

Report 8

DTE-DCE rate is
19200 bit/s

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AT FAX Command Set

DTE Command

DCE Action

Description or Notes

+FPR? (if
+IPR=38400)

Report 10

DTE-DCE rate is
38400 bit/s

+FPR? (if
+IPR=57600)

Report 18

DTE-DCE rate is
57600 bit/s

+FPR? (all other
+IPR settings)

Report 255

255 indicates invalid
setting

+FAA

Adaptive Answer
A Service Class 1 Facsimile DCE may have the ability to answer
as a data modem DCE or as a Facsimile DCE. It also may be able
to adaptively change from Class 1 facsimile mode (+FCLASS = 1.0)
to data modem operation (+FCLASS = 0) in response to the
incoming call. The +FAA parameter controls this feature.
Write syntax:

+FAA=

Valid values:

0, 1

Default value: 0
Mandatory
value:

0

+FAA=0

The DCE answers only as a Class 1 facsimile
device. No automatic switching of service class
shall occur based on the calling device type.

+FAA=1

The DCE can answer and automatically
determine whether to answer as a facsimile DCE
or as a data modem. If a data modem is detected,
the DCE operates as described in 8.3.2.4.

The +FAA parameter controls automatic switching only from
✎ Class
1 to Class 0 for call answering only. It does not affect call

origination, switching to Class 1 from other classes, or switching
to classes other than Class 0.

Lucent/Agere Command Set (Advanced Users Only)

3–9

277662-001.book  Page 10  Friday, January 11, 2002  5:15 PM

AT FAX Command Set

+FMI?

Manufacturer Identification

Read Syntax:

AT+FMI?

This parameter reports the manufacturer identification.

+FMM?

Product Identification

Read Syntax:

AT+FMM?

This parameter reports product identification.

+FMR?

Version / Revision Information

Read Syntax:

AT+FMR?

This parameter reports the version, revision level, or other
pertinent information for the device.

3–10

Lucent/Agere Command Set (Advanced Users Only)

277662-001.book  Page 1  Friday, January 11, 2002  5:15 PM

4
V.25ter AT Command Set
These +GMx commands are required by Microsoft PC9x
specifications:
■

Manufacturer Identification (+GMI?)

■

Version/Revision Information (+GMR?)

■

Modem Identification (+GMM?)

The PC99 reporting command’s values and parameters are
displayed using the following:
■

Current subparameter value (+command?)

■

Where command is the command set (e.g., AT+DR?)

■

Supported range of values (+command=?)

■

Where command is the command set (e.g., AT+DR=?)

The chip set supports the following functionalities of the V.25ter
for a H.324 call:
■

The modified function of the ATD command when issued
while the analog voice connection is established. This
command will not cause the DTMF dialing and tone
detection associated with the usual ATD # command.

■

The AT commands, subparameters, and values listed in the
following chart.

Lucent/Agere Command Set (Advanced Users Only)

4–1

277662-001.book  Page 2  Friday, January 11, 2002  5:15 PM

V.25ter AT Command Set

V.25ter AT Commands
Command

Subparameter

Values

Description

AT+A8E=
,
,


v8o

<1> (default)
Disables the
CI option while in V.8
origination. However,
the modem detects
ANSam and is
capable of starting in
V.34 mode when
initiating the call as a
data call.
<6> Enables DCE
control of V.8 and
CI option.

Defined for two
conditions: as a
parameter to
configure
V.8 originating
and answering
operation while
the DCE is
on-hook, and to
initiate an action
if the DCE is
off-hook.
V.8 negotiation
does not
preclude
simultaneous
implementation of
other negotiation
means such as
V.8bis, V.18, or
V.32bis.

v8a

<1> (default)
Disables the
CI option while in
V. negotiation.
However, the modem
sends the ANSam
and is capable of
starting in V.34 mode
when answering
a call.
<5> Enables DCE
control of V.8 and
CI option.

4–2

Lucent/Agere Command Set (Advanced Users Only)

277662-001.book  Page 3  Friday, January 11, 2002  5:15 PM

V.25ter AT Command Set

V.25ter AT Commands (Continued)
Command

Subparameter

Values

AT+A8E=
,
,


v8cf

<21h> Call function
for H.324 calls.
 Call function
for DSVD calls.

Description

(continued)

AT+A8E?

Reports current
values of
sub-parameters.

AT+A8E=?

Reports
supported ranges
of values ,
, and

.
+A8I:


Used by an
answering DCE if

+A8E, !=0,
to indicate
detection of a V.8
CI signal and to
report the
recovered Call
Function octet(s).
Value  is a
hexadecimal
code octet that
can take values
as shown above
in +A8E
command.

+A8M=


Coded CM or
JM octet

Refer to V.8
document for coding.

Lucent/Agere Command Set (Advanced Users Only)

Directs the DCE
to send a V.8 CM
or JM signal
using the
specified
hexadecimal
coded string.

4–3

277662-001.book  Page 4  Friday, January 11, 2002  5:15 PM

V.25ter AT Command Set

V.25ter AT Commands (Continued)
Command

Subparameter

Values

Description

+A8A:




<1> Indicates
V.8 ANSam
signal flags.
<0> Indicates no
ANSam signal
detected.

Used by a
calling DCE if

AT+DR

<1> Compression
reporting on.
<0> Compression
reporting off.

Turns
compression
reporting on
or off.

AT+MR

<1> Modulation
reporting on.
<0> Modulation
reporting off.

Turns modulation
reporting on
or off.

AT+ER

<1> Error control
reporting on.
<0> Error control
reporting off.

Turns error
control reporting
on or off.

+A8E  #0
to indicate
detection of an
answering signal.

AT+A8E?

Reports current
values of
sub-parameters.

AT+A8E=?

Reports
supported ranges
of values ,
, and

.

4–4

Lucent/Agere Command Set (Advanced Users Only)

277662-001.book  Page 5  Friday, January 11, 2002  5:15 PM

V.25ter AT Command Set

V.25ter AT Commands (Continued)
Command

Subparameter

Values

+A8I:


Description
Used by an
answering DCE if

+A8E, !=0,
to indicate
detection of a V.8
CI signal and to
report the
recovered Call
Function octet(s).
Value  is a
hexadecimal
code octet that
can take values
as shown above
in +A8E
command.

+A8M=


Coded CM or JM
octet

Refer to V.8
document for coding.

Directs the DCE
to send a V.8 CM
or JM signal
using the
specified
hexadecimal
coded string.

+A8A:




<1> Indicates
V.8 ANSam
signal flags.
<0> Indicates no
ANSam signal
detected.

Used by a
calling DCE if

<1> Compression
reporting on.
<0> Compression
reporting off.

Turns
compression
reporting on
or off.

AT+DR

Lucent/Agere Command Set (Advanced Users Only)

+A8E  #0 to
indicate detection
of an answering
signal.

4–5

277662-001.book  Page 6  Friday, January 11, 2002  5:15 PM

V.25ter AT Command Set

V.25ter AT Commands (Continued)
Command

Values

Description

AT+MR

<1> Modulation
reporting on.
<0> Modulation
reporting off.

Turns modulation
reporting on
or off.

AT+ER

<1> Error control
reporting on.
<0> Error control
reporting off.

Turns error
control reporting
on or off.

AT+ILRR

<1> DTE rate
reporting on.
<0> DTE rate
reporting off.

Turns DTE rate
reporting on
or off.

<1,0,1>

Buffered mode.

Determines
the error
correction mode.

<0,1,0>

Direct mode.

<4,4,6>

MNP or disconnect
mode.

<2,3,5>

LAPM or disconnect
mode.

<3,3,5>

LAPM or disconnect
mode.

<4,0,6>

MNP or
buffered mode.

AT+ES=
<1,0,1>,
<0,1,0>,
<4,4,6>,
<2,3,5>,
<3,3,5>,
<4,0,6>,
<3,0,2>,
<2,0,2>,
<3,2,4>

4–6

Subparameter

Lucent/Agere Command Set (Advanced Users Only)

277662-001.book  Page 7  Friday, January 11, 2002  5:15 PM

V.25ter AT Command Set

V.25ter AT Commands (Continued)
Command

Subparameter

Values

AT+ES=
<1,0,1>,
<0,1,0>,
<4,4,6>,
<2,3,5>,
<3,3,5>,
<4,0,6>,
<3,0,2>,
<2,0,2>,
<3,2,4>

<3,0,2>

LAPM, MNP, or
buffered modem
(default).

<2,0,2>

LAPM or
buffered mode.

<3,2,4>

LAPM, MNP, or
disconnect mode.

<0,0>

No flow control.

<1,1>

Software flow
control, XON/XOFF
characters
processed by
modem.

<3,1>

Software flow
control, XON/XOFF
characters passed
to DTE.

<2,2>

Hardware flow
control.

Description

(continued)

AT+IFC=
<0,0>,
<1,1>,
<3,1>,
<2,2>

Lucent/Agere Command Set (Advanced Users Only)

Determines the
local flow control
method.

4–7

277662-001.book  Page 8  Friday, January 11, 2002  5:15 PM

V.25ter AT Command Set

V.25ter AT Commands (Continued)
Command

Subparameter

Values

Description

AT+DS=
<3,0>,
<0,0>,<0>

<3,0>

V42bis

Determines the
data compression
method.

<0,0>

No compression

<0>

No compression

Data and General Commands
AT+ MS=





4–8

Use this
command to set
the modems
modulation and
its associated
parameters.
Leave blank
any optional
parameter whose
value is not going
to change.

Lucent/Agere Command Set (Advanced Users Only)

277662-001.book  Page 9  Friday, January 11, 2002  5:15 PM

V.25ter AT Command Set

V.25ter AT Commands (Continued)
Command

Subparameter

AT+MS=



Values

Description
Specifies the
preferred modem
carrier to use in
originating or
answering a
connection.

V92
V90
K56
V34
V32
V32B
V22
V.22B
V23C

V21
Bell212A
Bell103

Lucent/Agere Command Set (Advanced Users Only)

V.92 (default)
V.90
K56flex
V.34
V.32
V.32bis
V.22
V.22bis
V.23, Constant
carrier, ,
asymmetric FDM
V.21
Bell 212A
Bell 103

4–9

277662-001.book  Page 10  Friday, January 11, 2002  5:15 PM

V.25ter AT Command Set

V.25ter AT Commands (Continued)
Command

Subparameter

AT+MS=



Values

Description
Automatic
modulation
negotiation is
enabled or
disabled by

.
However, if
values are
specified for the
 and
the 
parameters,
automatic rate
selection will be
disabled and the
modem will
attempt to
connect at the
specified rates.

0
1

4–10

Disables
Enabled (default)

Lucent/Agere Command Set (Advanced Users Only)

277662-001.book  Page 11  Friday, January 11, 2002  5:15 PM

V.25ter AT Command Set

V.25ter AT Commands (Continued)
Command

Subparameter

AT+MS=



Values

Description
The 
specifies the
highest
connections rate
for the DCE.

0

Determined by
modulation
selected in


300 - 33600

(default).
Value limited by
modulation
selected in

.

Lucent/Agere Command Set (Advanced Users Only)

4–11

277662-001.book  Page 12  Friday, January 11, 2002  5:15 PM

V.25ter AT Command Set

V.25ter AT Commands (Continued)
Command

Subparameter

Values

Description
The Valid

 for
each 
V90, V34

V32bis

V32

V22bis
V22
V23C, Bell212A
V.21, Bell103

AT+MS=

2400
bits/s—33600
bits/s in steps of
2400 bits/s.
4800
bits/s—19200
bits/s in steps of
2400 bits/s.
4800
bits/s—14400
bits/s in steps of
2400 bits/s.
2400 bits/s.
2200 bits/s.
1200 bits/s.
300 bits/s.
The  specifies
the rate limit used
in the receive
direction.



0

Determined by
modulation
selected in


75 - 56000

(default).
Value limited by
modulation
selected in

.

4–12

Lucent/Agere Command Set (Advanced Users Only)

277662-001.book  Page 13  Friday, January 11, 2002  5:15 PM

V.25ter AT Command Set

V.25ter AT Commands (Continued)
Command

Subparameter

Values

Description
The Valid


for each 
V90

K56

V34

V32bis

V32

V22bis
V22
V23C, Bell212A
V.21, Bell103

Lucent/Agere Command Set (Advanced Users Only)

28000
bits/s—56000
bits/s in steps of
1333 bits/s.
32000
bits/s—56000
bits/s in steps of
2000 bits/s.
2400
bits/s—33600
bits/s in steps of
2400 bits/s.
4800
bits/s—19200
bits/s in steps of
2400 bits/s.
4800
bits/s—14400
bits/s.
240 bits/s.
2200 bits/s.
1200 bits/s.
300 bits/s.

4–13

277662-001.book  Page 14  Friday, January 11, 2002  5:15 PM

V.25ter AT Command Set

V.25ter AT Commands (Continued)
Command

Subparameter

Values

Description

Extended Syntax Commands
AT+MS

Select or
deselect
transmission of
the rate report
result code.
The current
active settings
are reported
under control of
the +MR
parameter.
Optional
subparameters
do not need to be
reported if not
implemented or
set to 0.

4–14

Lucent/Agere Command Set (Advanced Users Only)

277662-001.book  Page 15  Friday, January 11, 2002  5:15 PM

V.25ter AT Command Set

V.25ter AT Commands (Continued)
Command

Subparameter

AT+MS

AT+ MS=







Values

Description
Once a
modulation is
selected by the
+MS command,
the auto rate in
both directions
and the auto
mode will be
activated unless
either parameter,
 or
 is
specified by the
same command.
The settings of
this command
overwrite the
settings of S28,
S37, S38, S109.
Likewise,
changes to these
registers ovewrite
the settings of the
+MS command.

AT+MS ?

Display the
current status of
the rate report
result code.

AT+MS =?

Display the
supported
parameter values
for DTE-DCE
local rate
reporting.

Lucent/Agere Command Set (Advanced Users Only)

4–15

277662-001.book  Page 1  Friday, January 11, 2002  5:15 PM

5
V.80 AT Command Set
The chip set supports the Synchronous Access Mode and most of
the commands specified in V.80 standards. The commands are
either AT commands issued in the command mode, or in-band
commands transmitted in the data stream. These in-band
commands are delimited by the EM character (hexadecimal 19, or
numerically, 19H). Refer to ITU - V.80 Recommendations for
details of in-band signaling.
V.80 AT Commands
Command

Subparameters

Values

Description

+ES=[[,,
]]

Orig_rqstans_fbk

<6> Initiate

Controls
operation of the
V.42 protocol in
the DCE.

Lucent/Agere Command Set

Synchronous
Access Mode when
the data state is
entered.
<8> Initiate
Synchronous
Access Mode when
connection is
completed and
Data State is
entered.

5–1

277662-001.book  Page 2  Friday, January 11, 2002  5:15 PM

V.80 AT Command Set

V.80 AT Commands (Continued)
Command
+ES?

Subparameters

Values

Description
Reads syntax
command to
query current
values of the +ES
sub-parameters.
The DCE
transmits this
string of
information text
to the DTE:

+ES:,,
.
+ES=?

Tests syntax
command to
obtain all defined
values of the +ES
sub-parameters.
The DCE
transmits this
string of
information text to
the DTE: +ES:( list

of supported

values),, (list of
supported
 values).

5–2

Lucent/Agere Command Set

277662-001.book  Page 1  Friday, January 11, 2002  5:15 PM

A
New V.250 Commands to Support
V.92 AT Command Set
No extra space is allowed in the commands. Otherwise, the
modem will return an error response. All the settings of these
commands can overwrite, or be overwritten by, the results of the
related commands in the current modem command set.
The commands support both read and test syntax. The format of
the read syntax is “+XXX?.” This type of command will return the
current settings in use for the command. The format of the test
syntax is “+XXX=?.” This type of command will return a list of the
support values for the command.

+MS Modulation Selection
Added support for a valid carrier value of V.92
Valid Parameter Syntax:
+MS=,,<0>,,<0>,
+MS?
+MS=?

To support V.92, a new valid carrier value has been defined. A list
of the valid  values which are currently supported are
shown below in Table 1. The current version of code does not
support V.92 upstream. Therefore, no other modifications have
been made to the +MS command. Note that the maximum rate
upstream, , is limited to 31200 for V.90 and V.92.
Please see the Venus AT Command Document for a complete
description of the +MS command.

Lucent/Agere Command Set (Advanced Users Only)

A–1

277662-001.book  Page 2  Friday, January 11, 2002  5:15 PM

New V.250 Commands to Support V.92 AT Command Set

Valid Carrier Values

+DCS

Value

Description

V92

V.92 (default)

V90

V.90

K56

K56flex

V34

V.34

V32

V.32

V32B

V.32bis

V22

V.22

V.22B

V.22bis

V23C

V.23, constant carrier,
asymmetric FDM

V21

V21

Bell212A

Bell 212A

Bell103

Bell 103

Selection of Data Compression
Algorithm

Added support for V.44
Valid Parameter Syntax:
+DCS=[,]
+DCS=?
+DCS?

This command will select the data compression algorithm.
The parameter  specifies whether the V.42 bis algorithm
should be enabled. The parameter  specifies whether the
V.44 algorithm should be enabled.

A–2

Lucent/Agere Command Set (Advanced Users Only)

277662-001.book  Page 3  Friday, January 11, 2002  5:15 PM

New V.250 Commands to Support V.92 AT Command Set

Table A–1:

Valid  Values

Value

Description

0

V.42bis must not be used

1

V.42bis acceptable (default)

Table A–2:

Valid  Values

Value

Description

0

V.44 must not be used

1

V.44 acceptable

2

V.44 only if V92 server (default)

+DR Data Compression Reporting
Added support for V.44
Valid Parameter Syntax:
+DR=
+DR?
+DR=?

This command will turn on/off the compression report.

Table A–3:

DR=x Data Compression Report Value

Value

Description

0

Disables the compression report (default).

1

Enables the compression report.

Lucent/Agere Command Set (Advanced Users Only)

A–3

277662-001.book  Page 4  Friday, January 11, 2002  5:15 PM

New V.250 Commands to Support V.92 AT Command Set

If the compression report is enabled, the +DR:,intermediate
result code, reports the current DCE-DCE data compression type.
It is issued after the Error Control Report (+ER) and before the
final result code (e.g., CONNECT). The format is shown in Table 5.

Table A–4:
DR=x Data Compression Reporting
Intermediate Result Codes
Value

Description

+DR: NONE

Data compression not in use.

+DR: V42B

V.42bis is in use in both directions.

+DR: V44

V.44 is in use in both directions.

+PCW Call Waiting Enable
Added for V.92 support
Valid Parameter Syntax:
+PCW=
+PCW?
+PCW=?

This command will control the action to be taken upon detection
of call waiting in a V.92. The values specified by this command
are not modified when an AT&F command is issued.

Table A–5:

A–4

Valid  Values

Value

Description

0

Toggle V.24 Circuit 125 and collect
Caller ID if enabled by +VCID.

1

Hang up.

2

Ignore V.92 call waiting (default).

Lucent/Agere Command Set (Advanced Users Only)

277662-001.book  Page 5  Friday, January 11, 2002  5:15 PM

New V.250 Commands to Support V.92 AT Command Set

+PMH Modem on Hold Enable
Added for V.92 support
Valid Parameter Syntax:
+PMH=
+PMH?
+PMH=?

This command will control if modem on hold procedures are
enabled during V.92 operation. The values specified by this
command are not modified when an AT&F command is issued.

Table A–6:

Valid +PMH= Values

Value

Description

0

Enables V.92 modem on hold.

1

Disables V.92 modem on hold (default).

Lucent/Agere Command Set (Advanced Users Only)

A–5

277662-001.book  Page 6  Friday, January 11, 2002  5:15 PM

New V.250 Commands to Support V.92 AT Command Set

+PMHT Modem on Hold Timer
Added for V.92 support
Valid Parameter Syntax:
+PMHT=
+PMHT?
+PMHT=?

This command will determines if the modem will accept a
Modem on Hold (MOH) request and will set the MOH Timeout.

Table A–7:

A–6

+PMHT= Values

Value

Description

0

Deny MOH Request (default)

1

Grant MOH Request with 10 sec timeout

2

Grant MOH Request with 20 sec timeout

3

Grant MOH Request with 30 sec timeout

4

Grant MOH Request with 40 sec timeout

5

Grant MOH Request with 1 min timeout

6

Grant MOH Request with 2 min timeout

7

Grant MOH Request with 3 min timeout

8

Grant MOH Request with 4 min timeout

9

Grant MOH Request with 6 min timeout

10

Grant MOH Request with 8 min timeout

11

Grant MOH Request with 12 min timeout

12

Grant MOH Request with 16 min timeout

13

Grant MOH Request with indefinite timeout

Lucent/Agere Command Set (Advanced Users Only)

277662-001.book  Page 7  Friday, January 11, 2002  5:15 PM

New V.250 Commands to Support V.92 AT Command Set

+PMHR Initiate Modem on Hold (MOH)
Added for V.92 support
Valid Parameter Syntax:
+PMHR=
+PMHR?
+PMHR=?

This command will determine if the modem will accept a Modem
on Hold (MOH) request and will set the MOH Timeout. This
command is only valid if MOH is enabled and the modem is
off-hook or in data mode. Otherwise, ERROR will be returned.

Table A–8:

+PMHR= Values

Value

Description

0

Deny MOH Request (default).

1

Grant MOH Request with 10 sec timeout.

2

Grant MOH Request with 20 sec timeout.

3

Grant MOH Request with 30 sec timeout.

4

Grant MOH Request with 40 sec timeout.

5

Grant MOH Request with 1 min timeout.

6

Grant MOH Request with 2 min timeout.

7

Grant MOH Request with 3 min timeout.

8

Grant MOH Request with 4 min timeout.

9

Grant MOH Request with 6 min timeout.

10

Grant MOH Request with 8 min timeout.

11

Grant MOH Request with 12 min timeout.

12

Grant MOH Request with 16 min timeout.

13

Grant MOH Request with indefinite timeout.

Lucent/Agere Command Set (Advanced Users Only)

A–7

277662-001.book  Page 8  Friday, January 11, 2002  5:15 PM

New V.250 Commands to Support V.92 AT Command Set

+PIG PCM Upstream Ignore
Added for V.92 support
Valid Parameter Syntax:
+PIG=[]
+PIG?
+PIG=?

This command will control the use of PCM upstream in a V.92.
PCM upstream is supported for Mercury based modems with
12 ns (or faster) RAM.

Table A–9:

A–8

Valid +PIG=[] Values

Value

Description

0

Enable PCM upstream.

1

Disable PCM upstream (default).

Lucent/Agere Command Set (Advanced Users Only)

277662-001.book  Page 9  Friday, January 11, 2002  5:15 PM

New V.250 Commands to Support V.92 AT Command Set

+PQC V.92 Phase 1 and Phase 2 Control
Added for V.92 support
Valid Parameter Syntax:
+PQC=
+PQC?
+PQC=?

This command will control the enabling or disabling of the V.92
shortened Phase 1 and Phase 2 startup. This command is used in
conjunction with the +PSS command. Changes to the value of
either S109 or +PQC will affect the values of the other AT
command.

Table A–10: Valid +PQC= Values
Value

Description

0

Enable Short Phase 1 and Short Phase 2.

1

Enable Short Phase 1.

2

Enable Short Phase 2.

3

Disable Short Phase 1 and
Short Phase 2 (default).

Lucent/Agere Command Set (Advanced Users Only)

A–9

277662-001.book  Page 10  Friday, January 11, 2002  5:15 PM

New V.250 Commands to Support V.92 AT Command Set

+PMHF V.92 Modem Hook Flash
Added for V.92 support
Valid Parameter Syntax:
+PMHF

This command causes the DCE to go on-hook for a specified
period of time, and then return off-hook for at least a specified
period of time. The specified period of time is normally one-half
second, but may be governed by national regulations. “ERROR” is
returned if MOH is not enabled.

+DS44 V.44 Data Compression
Added for V.44 support
Valid Parameter Syntax:
+DS44=,<0>,<0>,,,,,,
+DS44?
+DS44=?

This command will control the V.44 data compression function.
The  parameter specifies the DTE direction of the data
compression.

Table A–11: Valid  Values

A–10

Value

Meaning

0

No compression.

3

Both directions (default).

Lucent/Agere Command Set (Advanced Users Only)

277662-001.book  Page 11  Friday, January 11, 2002  5:15 PM

New V.250 Commands to Support V.92 AT Command Set

The  specifies the maximum number of code
words to be negotiated in the transmit direction. The
 specifies the maximum number of code
words to be negotiated in the receive direction. The valid range
for the receive and transmit values is shown in Table 12.
.
Table A–12: Valid Range of  and
 Values
Value

Meaning

1024

Default.

256-2048

Number of codewords in tx/rx direction.

The  specifies the maximum string length to be
negotiated in the transmit direction. The  specifies
the maximum string length to be negotiated in the receive
direction. The valid range for both the receive and transmit values
is shown in Table 13.

Table A–13: Valid Range of  and
 Values
Value

Meaning

255

Default.

31-255

String length in tx/rx direction.

Lucent/Agere Command Set (Advanced Users Only)

A–11

277662-001.book  Page 12  Friday, January 11, 2002  5:15 PM

New V.250 Commands to Support V.92 AT Command Set

The  specifies the maximum length of the
history buffer to be negotiated in the transmit direction. The
 specifies the maximum length of the history
buffer to be negotiated in the receive direction.

Table A–14: Valid Range of  and
 Values

A–12

Value

Meaning

5120

Transmit direction default.

4096

Receive direction default.

512-11008

History buffer size in tx/rx direction.

Lucent/Agere Command Set (Advanced Users Only)



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