Black Box MD1650A-JP User manual

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CUSTOMER
SUPPORT
INFORMATION
SEPTEMBER 2006
MD1650A-JP
V.92 Dialup 2-Wire or 4-Wire
Leased-Line Data/Fax Modem
AT Commands Reference Guide

FCC AND IC RFI STATEMENTS/TRADEMARKS USED IN THIS MANUAL
1
FEDERAL COMMUNICATIONS COMMISSION
AND
INDUSTRY CANADA
RADIO FREQUENCY INTERFERENCE STATEMENTS
This equipment generates, uses, and can radiate radio-frequency energy, and if not installed and used
properly, that is, in strict accordance with the manufacturer’s instructions, may cause interference to radio
communication. It has been tested and found to comply with the limits for a Class A computing device in
accordance with the specifications in Subpart B of Part 15 of FCC rules, which are designed to provide
reasonable protection against such interference when the equipment is operated in a commercial
environment. Operation of this equipment in a residential area is likely to cause interference, in which
case the user at his own expense will be required to take whatever measures may be necessary to correct
the interference.
Changes or modifications not expressly approved by the party responsible for compliance could void the user’s
authority to operate the equipment.
This digital apparatus does not exceed the Class A limits for radio noise emission from digital apparatus set out in the Radio
Interference Regulation of Industry Canada.
Le présent appareil numérique n’émet pas de bruits radioélectriques dépassant les limites applicables aux appareils numériques
de la classe A prescrites dans le Règlement sur le brouillage radioélectrique publié par Industrie Canada.
TRADEMARKS USED IN THIS MANUAL
BLACK BOX and the Double Diamond logo are registered trademarks of BB Technologies, Inc.
Linux is a registered trademark of Linus Torvalds.
MNP is a registered trademark of Microcom Systems, Inc.
Windows and Windows NT are either trademarks or registered trademarks of Microsoft Corporation in the
United States and/or other countries.
UNIX is a registered trademark of UNIX System Laboratories, Inc.
Any other trademarks mentioned in this manual are acknowledged to be the property of the trademark owners.

V.92 DIALUP 2-WIRE OR 4-WIRE LEASED-LINE DATA/FAX MODEM AT COMMANDS GUIDE
2
Contents
Chapter Page
1. Overview .................................................................................................................................................................3
2. AT Commands .......................................................................................................................................................4
2.1 General Commands.....................................................................................................................................4
2.2 Escape Commands.....................................................................................................................................19
2.3 Modem Connection Commands..............................................................................................................19
2.4 Caller ID Commands.................................................................................................................................21
2.5 Callback Security Commands ...................................................................................................................22
2.6 Data Compression Commands .................................................................................................................23
2.7 Error Control Commands.........................................................................................................................24
2.8 DTE Commands ........................................................................................................................................27
2.9 Modulation Command..............................................................................................................................29
2.10 Call Control Command.............................................................................................................................30
2.11 Test Command...........................................................................................................................................33
3. V.8/V.8bis Commands .........................................................................................................................................34
4. V.25bis Commands...............................................................................................................................................36
5. S-Registers.............................................................................................................................................................38
6. Result Codes.........................................................................................................................................................43
7. Setting Country/Regional Codes .......................................................................................................................51
7.1 Using the LCD Panel.................................................................................................................................51
7.2 Using the Global Wizard ...........................................................................................................................52
7.3 Using AT Commands ................................................................................................................................53

CHAPTER 1: Overview
3
1. Overview
AT commands are used to control your modem’s operation. Each command must be preceded by the
characters A and T to get the modem’s attention.
AT commands can be issued only when the modem is in command mode or online command mode. The
modem is in command mode whenever it is not connected to another modem. The modem is in data mode
whenever it is connected to another modem and ready to exchange data. Online command mode is a
temporary state in which you can issue commands to the modem while you’re connected to another modem.
When you need to send commands to the modem at the other end of the connection, put the modem into
online command mode from data mode. To do this, you must issue an escape sequence: Type +++ and wait for
the OK response. Then issue the hang-up command by typing ATH and pressing Enter. To return to data mode
from online command mode, type the command ATO.
To send AT commands to the modem, you must use a communications program (such as PhoneTools, which is
included with your modem, or HyperTerminal in Windows®95, 98, Me, XP, Windows NT®4.0, or Windows
2000). You can issue commands to the modem directly by typing them in the terminal window of the
communications program. To issue commands indirectly, configure the operating system or communications
program to send the commands automatically. Fortunately, communications programs make modems’ daily
operation effortless by hiding the commands from the user. Most users, therefore, need to use AT commands
only when reconfiguring the modem (for example, to turn autoanswer on or off).
The format for entering an AT command is ATXn, where Xis the command and nis the value for the
command, or command parameter. The value is always a number. If the value is zero, you can omit it from the
command. AT&W is equivalent to AT&W0.
Most commands have a default value, which is the value that is set at the factory. Default commands are
provided with each command in Chapter 2.
You must press Enter to send the command to the modem. Any time the modem receives a command, it sends
a response known as a result code. The most common result codes are OK, ERROR, and CONNECT. For a
table of valid result codes, see Chapter 6.
You can issue several commands in one line in a command string. The command string begins with AT and
ends when you press Enter. Spaces to separate the commands are optional; they are ignored by the command
interpreter. The most familiar command string is the initialization string, which is used to configure the
modem when it is powered on or reset, or when your communications software calls another modem.
An example of a command string is shown below. This string changes the speaker, enables V.42 error
correction, and enables CTS/RTS flow control.
AT M1 &E2 &K3<CR>

V.92 DIALUP 2-WIRE OR 4-WIRE LEASED-LINE DATA/FAX MODEM AT COMMANDS GUIDE
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2. AT Commands
2.1 General Commands
Command: AT Attention Code
Values: N/A
Description: The attention code precedes all command lines except A/ and the
escape sequence.
Command: Enter Key
Values: N/A
Description: Press the Enter or Return key to execute most commands.
Command: A Answer
Values: N/A
Description: Answers an incoming call before the final ring.
Command: A/ Repeat Last Command
Values: N/A
Description: Repeats the last command string. Do not precede this command with
AT. Do not press Enter to execute.
Command: BnCommunication Standard Setting
Values: n = 0 or 1
Default: 1
Description: B0: Selects ITU-T V.22 mode when the modem is at 300 or 1200 bps.
B1: Selects Bell 212A when the modem is at 300 or 1200 bps.
Command: DsDial
Values: s = dial string (phone number and dial modifiers)
Default: None
Description: Dials telephone number s, where smay be up to 40 characters long and
include the following dial string modifiers.
0–9 Digits 0 through 9.
* The “star” digit (tone dialing only).
# The “pound” digit (tone dialing only).
A–D A, B, C, D tone digits. Country specific; some countries may
prohibit these digits.
L Redials last number. (Must be placed immediately after ATD.)
P Selects pulse dialing until a T is encountered. Affects
current/subsequent dialing.
T Select tone dialing until a P is encountered. Affects current/
subsequent dialing.
W Wait for a new dial tone before continuing to dial. (X2 or X4
must be selected.)
, Pause during dialing for time set in S-Register S8.
; Return to command mode after dialing. (Place at end of dial
string.)

CHAPTER 2: AT Commands
5
Description (continued): ! Hook flash. Causes the modem to go quickly on-hook
then back off-hook.
@ Wait for silence. Causes the modem to wait for 5 seconds of
silence before processing the next part of the command. If
silence is not detected within the time set in S-Register S7,
the modem returns a NO ANSWER or BUSY code.
^ Toggle data calling tone on or off. Applies only to current
dialing attempt.
& Detect credit card “bong” tone. The character should follow
the phone number and precede the user’s calling card number
(for example, ATDT1028806127853500&123456789).
Command: DS=nDial Stored Telephone Number
Values: n = 0–3
Default: None
Description: Dials a number previously stored in directory number nby the &Zn=x
command.
Example: ATDS=3.
Command: EnEcho Command Mode Characters
Values: n = 0 or 1
Default: 1
Description: E0 Does not echo keyboard input to the terminal.
E1 Does echo keyboard input to the terminal.
Command: HnHook Control
Values: n = 0 or 1
Default: 0
Description: H0 Goes on-hook (hang up) and terminates any &T test in
progress.
H1 Goes off-hook (makes the phone line busy); enters command
mode.
Command: InInformation Request
Values: n = 0–6
Default: None
Description: I0 Displays the product code. For example, MD1650A-JP.
I1 Calculates ROM checksum; displays the least significant byte in
decimal format.
I2 Calculates ROM checksum and compares it to the prestored
checksum, displays OK if they match or ERROR if they don’t
match.
I3 Displays the firmware version and application codes.
I4 Displays the OEM-defined identifier string in either binary or
ASCII format.
I5 Displays the regional or country code. For example, 098.
I6 Displays the modem data pump model and internal code
version.
Command: L Not applicable.

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Command: L5 Lists Current Operating Parameters
Values: 5
Default: None
Description: Displays the current values for the error correction, flow control, data
compression, and serial port speed commands.
For example:
atL5
&E2 &E3 &E15 $SB115200
OK
Command: MnMonitor Speaker Mode
Values: n = 0, 1, 2, or 3
Default: 1
Description: Displays the current values for the error correction, flow control, data
compression, and serial port speed commands.
M0 Speaker is always off.
M1 Speaker is on until the carrier signal is detected.
M2 Speaker is always on when the modem is off-hook.
M3 Speaker is off when receiving carrier and during dialing, but
on during answering.
Command: OnReturn Online to Data Mode
Values: n = 0 or 1
Default: None
Description: O0 Exit online command mode and return to online data mode
without a retrain. Normally used after a +++ escape (see
+++ escape sequence).
O1 Exit online command mode and return to online data mode
after a retrain.
Command: P Pulse Dialing
Values: P, T
Default: T
Description: Forces pulse (non-touchtone) dialing until a T command or T
modifier is received.
Command: QnResult Codes Enable/Disable
Values: n = 0 or 1
Default: 0
Description: Q0 Enables result codes.
Q1 Disables result codes.
Command: SrSelect Register
Values: ris the S-Register number
Default: None
Description: Selects register Sras the last register accessed; for example, S0. The
command AT? can then be used to read the register, and the command
AT=ncan be used to set the register to value n.

CHAPTER 2: AT Commands
7
Command: Sr=nSet Register Value
Values: ris the S-Register number
Default: None
Description: Sets value of register Srto n, where nis entered in decimal format (for
example, S0=1). If the short form AT=nis used, the value is written to
the last accessed S-Register.
Command: Sr? Read Register Value
Values: ris the S-Register number
Default: None
Description: Reads value of register Srand displays it in 3-digit decimal format.
S2? gives the response 043. If the short form AT? is used, the last
accessed S-Register is read.
Command: T Tone Dialing
Values: P, T
Default: None
Description: Forces DTMF (touchtone) dialing until a P command or P dial
modifier is received.
Command: VnResult Code Format
Values: n = 0 or 1
Default: 1
Description: V0 Displays result codes as digits (terse response).
V1 Display result codes as words (verbose response).
Command: WnConnect Message Control
Values: n = 0, 1, or 2
Default: 0
Description: W0 The CONNECT result code reports the serial port speed only.
W1 The CONNECT result code reports the line speed, the error
correction protocol, and the serial port speed, respectively.
W2 The CONNECT result code reports the line speed only.
Command: XnResult Code Selection
Values: n = 0–4
Default: Country Dependent
Description: Selects the result message subset that the modem will use to inform the
computer of the results of commands.
X0 Sends OK, CONNECT, RING, NO CARRIER, ERROR, and NO
ANSWER; does not look for dial tone or busy signal.
X1 Sends X0 messages and connect speed; doesn’t look for dial
tone or busy signal.
X2 Sends X1 messages with NO DIALTONE; does not look for
busy signal.
X3 Sends X1 messages with BUSY; does not look for dial tone.
X4 Sends all messages, including NO DIALTONE and BUSY.

V.92 DIALUP 2-WIRE OR 4-WIRE LEASED-LINE DATA/FAX MODEM AT COMMANDS GUIDE
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NOTE
In fax mode, the only message sent to indicate a connection is CONNECT without a
speed indication. See also the \V command.
Command: ZnModem Reset
Values: n = 0 or 1
Default: None
Description: The modem performs a soft reset and restores (recalls) the
configuration profile according to the parameter supplied. If no
parameter is specified, zero is assumed.
Z0 Resets modem and restores Profile 0.
Z1 Resets modem and restores Profile 1.
NOTE
See also the &F and &W commands.
Command: &CnData Carrier Detect (DCD) Control
Values: n = 0, 1, 2, 3, 4, 5, 6, or 7
Default: 1, 3, 4
Description: &C0 Turns off reset on loss of carrier.
&C1 A second way to turn off reset on loss of carrier.
&C2 DCD goes high 500 ms after CONNECT message is generated.
&C3 DCD goes high when the CONNECT message is generated.
&C4 Disables &C5 and &C6 commands.
&C5 UNIX®only: Holds DCD low until proper callback security
password is entered or until a disconnect occurs. This prevents
a UNIX login prompt from being displayed before the callback
security ENTER PASSWORD prompt appears.
&C6 Linux®only: Waits to display the connect message until the
proper callback security password is entered.
&C7 Resets on loss of DCD.
Command: &DnData Terminal Ready (DTR) Control
Values: n = 0, 1, 2, or 3
Default: 2
Description: This command interprets the high to low transition of the DTR signal
sent by the computer according to the supplied parameter. The action
taken depends on the current &Q setting.
&D0 &Q0, &Q5, &Q6: DTR is ignored (assumed high). Allows
operation with computers that do not provide DTR.
&Q1: DTR drop causes the modem to hang up. Autoanswer is
not affected.
&Q2, &Q3: DTR drop causes the modem to hang up.
Autoanswer is inhibited.

CHAPTER 2: AT Commands
9
Description (continued): &D1 &Q0, &Q1, &Q5, &Q6: DTR drop is interpreted by the modem
as if the asynchronous escape sequence had been entered. The
modem returns to asynchronous command state without
disconnecting.
&Q2, &Q3: DTR drop causes the modem to hang up.
Autoanswer is inhibited.
&D2 &Q0–&Q6: DTR drop causes the modem to hang up.
Autoanswer is inhibited.
&D3 &Q0, &Q1, &Q5, &Q6: DTR drop causes the modem to
perform a soft reset as if the Z command were received. The
&Y setting determines which profile is loaded.
&Q2, &Q3: DTR drop causes the modem to hang up.
Autoanswer is inhibited.
&Q5 or &Q6 and +FLCLASS=1 or +FCLASS=2: Same as for
&Q0.
NOTE
If &D1, &D2, or &D3 is set, the modem will not dial without a DTR drop.
Command: &EnV.42 Error Correction Modes
Values: n = 0, 1, or 2
Default: 1
Description: &E0 V.42 non-error correction mode (V.42 disabled).
&E1 V.42 auto-reliable mode.
&E2 V.42 reliable mode (V.42 enabled).
Command: &EnModem-Initiated Flow Control
Values: n = 3, 4, or 5
Default: 4
Description: &E3 Flow control disabled.
&E4 CTS/RTS hardware flow control.
&E5 X-ON/X-OFF software flow control.
NOTE
See also the L5 and &K commands.
Command: &EnV.42bis Data Compression
Values: n= 14 or 15
Default: 15
Description: &E14 V.42bis data compression disabled.
&E15 V.42bis data compression enabled.
NOTE
This command controls only V.42bis data compression, whereas the %C command
controls both V.42bis and MNP®5 data compression. The command in effect is the one
last entered. See also the L5 command.

V.92 DIALUP 2-WIRE OR 4-WIRE LEASED-LINE DATA/FAX MODEM AT COMMANDS GUIDE
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Command: &FnLoad Factory Settings
Values: n= 0 or 1
Default: None
Description: &F0 Loads factory configuration 0.
&F1 Loads factory configuration 1.
NOTE
See also the Z, L5, and &V commands.
Command: &GnV.22bis Guard Tone Control
Values: n= 0, 1, or 2
Default: Varies by country
Description: &G0 Disables guard tone.
&G1 Sets guard tone to 550 Hz.
&G2 Sets guard tone to 1800 Hz.
NOTE
The &G command is not used in North America and may not be permitted in some
countries.
Command: &KnFlow Control Selection
Values: n= 0, 3, 4, 5, or 6
Default: 3 (data modem mode)
6 (fax modem and voice modes)
Description: &K0 Disables flow control.
&K3 Enables CTS/RTS hardware flow control.
&K4 Enables X-ON/X-OFF software flow control.
&K5 Enables transparent X-ON/X-OFF flow control.
&K6 Enables both CTS/RTS and X-ON/X-OFF flow control.
NOTE
See also the &E command.
Command: &MnCommunications Mode
Values: n = 0–3
Default: 0
Description: This command determines the DTR operating mode. The modem
treats the &M command as a subset of the &Q command.
&M0 Selects direct asynchronous operation. Command sequence
&M0\N0 selects normal buffered mode, but command
sequence \N0&M0 selects direct mode. This is because the \N0
command is analogous to the &Q6 command.
&M1 Selects synchronous connect mode with asynchronous offline
command mode.
&M2 Selects synchronous connect mode with asynchronous offline
command mode. Same as &M1, except that &M2 enables DTR
dialing of directory slot 0. The modem disconnects if DTR is
low for more than the period stored in S25.

CHAPTER 2: AT Commands
11
Description (continued): &M3 Selects synchronous connect mode. This mode allows DTR to
act as a talk/data switch. A call is manually initiated while DTR
is inactive; when it becomes active, the handshake proceeds in
originate or answer mode according to S14 bit 7.
Command: &PnMake/Break Dial Ratio
Values: n = 0, 1, 2, or 3
Default: Varies by country/region
Description: &P0 Make/Break dial ratio of 39/61 at 10 pps
&P1 Make/Break dial ratio of 33/67 at 10 pps
&P2 Make/Break dial ratio of 39/61 at 20 pps
&P3 Make/Break dial ratio of 33/67 at 20 pps
Command: &QnSync/Async Mode
Values: n = 0–3, 5, 6
Default: 5
Description: This command is an extension of &M and is used to control which
connection modes are permitted. It is used in conjunction with S36
and S48. (See also the \N command.)
&Q0 Selects direct asynchronous operation. See &M0.
&Q1 Selects synchronous connect mode with asynchronous offline
command mode. See &M1. Serial interface operation only.
&Q2 Selects synchronous connect mode with asynchronous offline
command mode; enables DTR dialing of directory 0. See &M2.
Serial only.
&Q3 Selects synchronous connect mode with asynchronous offline
command mode; enables DTR to act as a talk/data switch. See
&M3. Serial only.
&Q5 The modem will try to negotiate an error-corrected link. It can
be configured using non-error-correction connection. See also
\N3.
&Q6 Selects asynchronous operation with speed buffering and no
error correction. Same as \N0.
Command: &RnClear to Send (CTS) Control
Values: n = 0 or 1
Default: &R0 Lets the CTS state follow the RTS state when online.
&R1 Forces CTS high (ON).
NOTE
This command applies only in synchronous mode.
Command: &SnData Set Ready (DSR) Control
Values: n = 0 or 1
Default: 0
Description: &S0 Forces DSR high (on) at all times.
&S1 Lets DSR go high only during a connection.

V.92 DIALUP 2-WIRE OR 4-WIRE LEASED-LINE DATA/FAX MODEM AT COMMANDS GUIDE
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Command: &VnDisplay current configuration and statistics for last connection
Values: n= 0 or 1
Default: None
Description: &V0 Displays the current (active) configuration.
&V1 Displays statistics for the last connection. Not available in all
versions.
NOTE
See also the L5 command.
Command: &WnStore Current Configuration
Values: n = 0 or 1
Default: None
Description: &W0 Stores current modem settings in nonvolatile memory as
Profile 0. Profile 0 is loaded instead of the factory defaults at
power-on (if &Y0 is set) and by the ATZ command.
&W1 Stores current modem settings in nonvolatile memory as
Profile 1. Profile 1 is loaded instead of the factory defaults at
power-on (if &Y1 is set) and by the ATZ1 command.
NOTE
See also the Z, &F, and &Y commands.
Command: &XnSynchronous Clock Source
Values: n = 0, 1, or 2
Default: 0
Description: Selects the source of the transmit clock for synchronous mode. In
asynchronous mode, the transmit and receive clocks are turned off. In
synchronous mode, the clocks are turned on with a frequency of 1200
Hz or faster corresponding to the speed selected for modem operation.
NOTE
Synchronous Online (&M1) must be enabled before you can set the synchronous
clock.
&X0 Selects internal timing. The modem generates the transmit
clock signal and applies it to the TXCLK output at the serial
interface.
&X1 Selects external timing. The local DTE sources the transmit
clock signal on the XTCLK input of the serial interface. The
modem applies this clock to the TXCLK output at the serial
interface.
&X2 Selects slave receive timing. The modem derives the transmit
clock signal from the incoming carrier and applies it to the
TXCLK output at the serial interface.

CHAPTER 2: AT Commands
13
Command: &YnSelect Profile for Hard Reset
Values: n = 0 or 1
Default: None
Description: &Y0 Select profile 0 to be loaded on power-up.
&Y1 Select profile 1 to be loaded on power-up.
NOTE
See also the &W and Z commands.
Command: &Zn=x Store Telephone Number
Values: n = 0–3 (with callback security disabled)
&Z3 is the phone memory location for leased-line dial backup number.
n = 0–29 (with callback security enabled—for a future release)
x = Stored telephone number
Default: None
Description: Stores telephone dial string xin memory location.
&Z3 is the phone memory location for leased-line dial backup number.
Dial the stored number using the ATDS=ncommand.
NOTE
See also the #CBSncommand.
Command: %CnData Compression Control
Values: n = 0, 1, 2, or 3
Default: 3
Description: Enables or disables data compression negotiation. The modem can
only perform data compression on an error-corrected link.
%C0 Disables data compression.
%C1 Enables MNP 5 data compression negotiation.
%C2 Enables V.42bis data compression negotiation.
%C3 Enables both V.42bis and MNP 5 data compression negotiation.
NOTE
This command controls both V.42bis and MNP 5 data compression, whereas the &E14
and &E15 commands control only V.42bis data compression. The command in effect is
the one last entered.
Command: %EnLine Quality Monitor
Values: n = 0, 1, or 2
Default: 2
Description: Controls whether or not the modem will automatically monitor the line
quality and request a retrain (%E1) or fallback to a lower speed when
line quality is insufficient and fall forward to a faster speed when line
quality is sufficient (%E2).
%E0 Disables line quality monitor and auto-retrain.
%E1 Enables line quality monitor and auto-retrain.
%E2 Enables line quality monitor and fallback/fall forward.

V.92 DIALUP 2-WIRE OR 4-WIRE LEASED-LINE DATA/FAX MODEM AT COMMANDS GUIDE
14
Command: %L Line Signal Level
Values: None
Default: None
Description: %L Returns a value that indicates the received signal level in dBm.
This value is a direct indication (DAA-dependent) of the
receive level at the MDP, not at the telephone line connector.
Examples: 009 = -9 dBm, 043 = -43 dBm, and so on.
Command: %Q Line Signal Quality
Values: None
Default: None
Description: %Q Reports line signal quality (DAA-dependent) as a three-digit
number. Returns the higher order but of the EQM value.
Based on the EQM value, retrain or fallback/fall forward may
be initiated if enabled by %E1 or %E2.
Command: %U PCM Code Selection
Values: n = 0 or 1
Default: 0
Description: Specifies the PCM code type for 56K modulation.
NOTE
The modem automatically selects the code type if the server sends the proper ID.
%U0 Selects µ-law coding—used in Japan.
%U1 Selects A-law coding—used outside Japan.
NOTE
See also the +MS= command.
Command: \AnMaximum MNP Block Size
Values: n = 0, 1, 2, or 3
Default: 1
Description: \A0 64-character maximum block size.
\A1 128-character maximum block size.
\A2 192-character maximum block size.
\A3 256-character maximum block size.
Command: \BnTransmit Break
Values: n = 0–9 in 100-ms units
Default: 3
Description: In non-error mode only, sends a break signal of the specified length to
a remote modem. Works in conjunction with the \K command.
Command: \KnBreak Control
Values: n = 0–5
Default: 5
Description: Controls the response of the modem to a break received from the
computer, the remote modem, or the \B command.

CHAPTER 2: AT Commands
15
Command: \NnError Correction Mode Selection
Values: n = 0–5
Default: 3
Description: \N0 Normal (non-error correction) mode with data buffering.
Forces &Q6.
\N1 Direct mode. Equivalent of &M0 and &Q0 modes. Forces &Q0.
\N2 V.42/MNP reliable (error-correction) mode. Modem attempts
first a V.42 connection and then an MNP connection. Failure to
make a reliable connection results in the modem hanging up.
Forces &Q5, S36=4, and S48=7.
\N3 V.42/MNP auto-reliable mode. The modem attempts first to
connect in V.42 mode, then in MNP mode, and finally in
non-error-correction mode with data buffering. Forces &Q5,
S36=7, and S48=7.
\N4 V.42 (LAPM) reliable mode. If the modem cannot make a V.42
connection, it disconnects. Forces &Q5 and S48=0.
NOTE
-K1 can override \N4.
\N5 MNP reliable mode. If the modem cannot make an MNP
connection, it disconnects. Forces &Q5, S36=4, and S48=128.
Command: \VnSingle Line Connect Message
Values: n = 0 or 1
Default: 0
Description: \V0 Disables single line connect message. CONNECT messages are
controlled by the X, W, and S95 settings.
\V1 Enables single line CONNECT. Formatted: CONNECT<Serial
PortSpeed></Modulation></Protocol></Compression>
</Line Speed></Voice and Data>. Overrides X, W, and S95
commands. CONNECT messages display in the single line
format subject to V and Q. In non-verbose mode (V0), single
line CONNECT messages are disabled and a single numeric
result code is generated.
Command: +FCLASS= Display Current Fax Class
Values: 0, 1, 2, 8
Default: None
Description: 0 Data
1 Fax—Class 1, Class 1.0
2 Fax—Class 2, 2.0, 2.1
8 Voice Commands

V.92 DIALUP 2-WIRE OR 4-WIRE LEASED-LINE DATA/FAX MODEM AT COMMANDS GUIDE
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Command: +GCI Country/Region of Installation
Description: The extended syntax command selects and indicates the
region/country of installation for the modem. The parameter selects
the settings for any operational parameters that need to be adjusted
for national regulations or telephone networks.
Syntax: +GCI=<region_code>
Defined Values: <region_code>
Example: Euro/Nam=B5
The region/country code for Japan is 00.
Default: If the modem is specified for use in only one country, the country code
is the default. Otherwise, the default is defined by the OEM. The
factory default is B5.
Report Commands: +GCI? Reports current or selected values.
+GCI=? Reports supported range of parameter values.
Command: +MS= Modulation Selection
Values & Default: See description below.
Description: This extended-format command selects modulation, enables or disables
automode, specifies the lowest and highest connection rates, selects µ-
Law or A-Law codec type, and specifies the highest transmit rate using
one to five subparameters.
The command format is:
+MS=[+MS=[<carrier>[,<automode>[,<min_TX_rate>[<max_TX_rate>
[,<min_RX_rate>[,<max_RX_rate>]]]]]]
Subparameters that are not entered retain their current value. Commas
separate optional subparameters and should be inserted to skip a
subparameter.
Example: +MS=,0,<CR> disables automode and keeps all other settings
at their current values.
Subparameters: mod—A decimal number that specifies the preferred modulation
(automode enabled) or the modulation to use in originating or
answering a connection (automode disabled).
+MS Command Supported Rates
Modulation <carrier> Possible (<min rx rate>,<max rx rate>,
<min tx rate>), and <max tx rate>)
Rates (bps)
Bell 103 B103 300
Bell 212 B212 1200 Rx/75 Tx or 75 Rx/1200 Tx
V.21 V21 300
V.22 V22 1200
V.22bis V22B 2400 or 1200
V.23 V23C 1200
V.32 V32 9600 or 4800
V.32bis V32B 14,400, 12,000, 9600, 7200, or 4800
V.34 V34 33,600, 31,200, 28,800, 26,400, 24,000,
21,600, 19,200, 16,800, 14,400, 12,000
9600, 7200, 4800, or 2400

CHAPTER 2: AT Commands
17
Subparameters (continued): Modulation <carrier> Possible (<min rx rate>,<max rx rate>,
<min tx rate>), and <max tx rate>)
Rates (bps)
V.90 V90 56,000, 54,667, 53,333, 52,000, 50,667,
49,333, 48,000, 46,667, 45,333, 44,000,
42,667, 41,333, 40,000, 38,667, 37,333,
36,000, 34,667, 33,333, 32,000, 30,667,
29,333, 28,000, 26,667, 25,333, 24,000
V.92 V92 Same as V.90 above
(downstream)
V.92 V92 48,000, 46,667, 45,333, 44,000, 42,667,
(upstream) 41,333, 40,000, 38,667, 37,333, 36,000,
34,667, 33,333, 32,000, 30,667, 29,333,
28,000, 26,667, 25,333, 24,000
automode—An optional numeric value that enables or disables
automatic modulation negotiation using V.8bis/V.8 or V.32bis Annex A.
The options are:
0 = Disables automode
1 = Enables automode (default)
<min_rx_rate> and <max_rx_rate>
Numeric values that specify the lowest (<min_rx_rate>) and highest
(<max_rx_rate>) rate at which the modem may establish a receive
connection. May be used to condition distinct limits for the receive
direction as distinct from the transmit direction. Values for this
subparameter are decimal encoded, in units of bit/s. The possible
values for each modulation are listed in the table on the previous page.
Actual values will be limited to possible values corresponding to the
entered <carrier> and fallback <carrier> as determined during
operation. (Default=lowest (<min_rx_rate>) and highest
(<max_rx_rate>) supported by the selected carrier.)
<min_tx_rate> and <max_tx_rate>
Numeric values that specify the lowest (<min_tx_rate>) and highest
(<max_tx_rate>) rate at which the modem may establish a transmit
connection. May be used to condition distinct limits for the transmit
direction as distinct from the receive direction. Non-zero values for this
subparameter are decimal encoded, in units of bit/s. The possible
values for each modulation are listed in the table on the previous page.
Actual values will be limited to possible values corresponding to the
entered <carrier> and fallback <carrier> as determined during
operation. (Default = lowest (<min_tx_rate>) and highest
(<max_tx_rate>) supported by the selected carrier.)

V.92 DIALUP 2-WIRE OR 4-WIRE LEASED-LINE DATA/FAX MODEM AT COMMANDS GUIDE
18
Command: -KnMNP Extended Services
Values: n = 0, 1, or 2
Default: 0
Description: Enables or disables conversion of a V.42 LAPM connection to an
MNP 10 connection.
-K0 Disables V.42 LAPM to MNP 10 conversion.
-K1 Enables V.42 LAPM to MNP 10 conversion.
-K2 Enables V.42 LAPM to MNP 10 conversion; inhibits MNP
Extended Services initiation during V.42 LAPM answer mode
detection phase.
Command: ** Flash Memory Download
Values: 0, 1, or 2
Description: **0 Initiates download to flash memory at the last sensed speed.
**1 Initiates download to flash memory at 38.4 kbps.
**2 Initiates download to flash memory at 57.6 kbps.
Command: *B View Numbers in Blacklist
Values: N/A
Description: If blacklisting is in effect, AT*B displays a list of numbers for which the
last call attempted in the previous two hours failed. Permanently
forbidden numbers as defined by country requirements do not appear
in this list. If no numbers are blacklisted, only the OK result code is
displayed.
Command: *D View Delayed Numbers
Values: N/A
Description: AT*D displays a list of delayed numbers, as defined in the *B
command, together with their delay times. If no numbers are delayed,
only the OK result code is displayed.
Command: $CnKey Abort
Values: n = 0, 1
Default: Key abort will work for both originate and answer. The value can be
stored.
$C0 Disables key abort.
$C1 Enables key abort.
Command: $SBnSerial Port Baud Rate
Values: n = speed in bits per second
Default: 57600
Description: $SB300 Sets serial port to 300 bps.
$SB1200 Sets serial port to 1200 bps.
$SB2400 Sets serial port to 2400 bps.
$SB4800 Sets serial port to 4800 bps.
$SB9600 Sets serial port to 9600 bps.
$SB19200 Sets serial port to 19,200 bps.
$SB38400 Sets serial port to 38,400 bps.
$SB57600 Sets serial port to 57,600 bps.
$SB115200 Sets serial port to 115,200 bps.