Chapter 1 – AT Commands, S-Registers and Result Codes

Command:

&Ln

Leased Line Operation

 

Values:

 

n = 0, 1, or 2

 

Defaults:

 

0

 

 

Description:

 

&L0

The modem is set for standard dial-up operation.

 

 

 

&L1

The modem is set for leased line operation in originate mode.

 

 

&L2

The modem is set for leased line operation in answer mode.

 

 

Note: For &L1 and &L2, there is a 30-second window between power up and the

 

 

 

starting of the leased line handshake. During this time, you can turn off the

 

 

 

command, if desired.

 

Command:

&Pn

Pulse Dial Make-to-Break Ratio Selection

 

Values:

 

n = 0, 1, or 2

 

Default:

 

0

 

 

Description:

 

&P0

60/40 make-to-break ratio

 

 

 

&P1

67/33 make-to-break ratio

 

 

 

&P2

20 pulses per second

 

 

 

Note: The &P2 command is available only if the country code is set to Japan.

Command:

&Qn

Asynchronous Communications Mode

 

Values:

 

n = 0, 5, 6, 8, or 9

 

Default:

 

5

 

 

Description:

 

&Q0

Asynchronous with data buffering. Same as \N0.

 

 

 

&Q5

Error control with data buffering. Same as \N3.

 

 

 

&Q6

Asynchronous with data buffering. Same as \N0.

 

 

 

&Q8

MNP error control mode. If MNP error control is not established, the modem

 

 

 

falls back according to the setting in S36.

 

 

 

&Q9

V.42 or MNP error control mode. If neither error control is established, the

 

 

 

modem falls back according to the setting in S36.

Command:

&Sn

Data Set Ready (DSR) Control

 

Values:

 

n = 0 or 1

 

Default:

 

0

 

 

Description:

 

&S0

DSR is always ON.

 

 

 

&S1

DSR goes ON only during a connection.

 

Command:

&Tn

Loopback Test (V.54 Test) Commands Values:

n = 0, 1, 3, 6

Default:

 

None

 

 

Description:

 

The modem can perform selected test and diagnostic functions. A test can be run

 

 

only when the modem is operating in non-error-correction mode (normal or direct

 

 

mode). For tests 3 and 6, a connection between the two modems must be

 

 

established. To terminate a test in progress, the escape sequence (+++AT) must

 

 

be entered.

 

 

 

&T0

Stops any test in progress.

 

 

 

&T1

Starts a local analog loopback, V.54 Loop 3, test. If a connection exists when

 

 

 

this command is issued, the modem hangs up. When the test starts, a

 

 

 

CONNECT message is displayed.

 

 

 

&T3

Starts local digital loopback, V.54 Loop 2, test. If no connection exists,

 

 

 

ERROR is returned.

 

 

 

&T6

Initiates a remote digital loopback, V.54 Loop 2, test without self-test. If no

 

 

 

connection exists, ERROR is returned.

 

Multi-Tech Systems, Inc. SocketModem MT5634SMIxx Reference Guide (S000263C)

13

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Multi-Tech Systems MT5634SMI V.34 manual Command Leased Line Operation, Command Pulse Dial Make-to-Break Ratio Selection

MT5634SMI V.34, MT5634SMI V.92 specifications

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