Chapter 2 – AT Commands

Data Compression Commands

Command:

+DR Data Compression Reporting

Values:

 

0, 1

 

 

Default:

 

1

 

 

Description:

 

This extended-format numeric parameter controls whether or not the extended-format

 

 

+DR: intermediate result code is transmitted from the modem to the DTE. S95 bit 5 is

 

 

reset to 0 for +DR=0 and is set to a 1 for +DR=1. The more recent setting of +DR or S95

 

 

bit 5, and the W command setting, determines the actual data compression result code

 

 

reporting (see S95 Parameter and W Command).

 

 

+DR0

Data compression reporting disabled (no +DR result code transmitted).

 

 

+DR1

Data compression reporting enabled (+DR result code transmitted). (Default.)

 

 

+DR:

<type> Intermediate Result Code. The +DR: <type> reported represents the

 

 

 

current (negotiated or renegotiated) modem-modem data compression type. If

 

 

 

enabled, the intermediate result code is transmitted at the point after error control

 

 

 

negotiation (handshaking) at which the modem has determined which data

 

 

 

compression technique will be used (if any) and the direction of operation. The

 

 

 

+DR intermediate result code, if enabled, is issued after the Error Control Report

 

 

 

(+ER) and before the final result code (e.g., CONNECT).

Report Commands:

+DR?

Reports current or selected values.

 

 

+DR=? Reports supported range of parameter values.

Command:

+DS Data Compression

 

Values:

 

<direction> Specifies the desired direction(s) of operation of the data compression

 

 

 

function; from the DTE point of view.

 

 

 

+DS0

Negotiated; no compression (V.42bis P0=0).

 

 

 

+DS3

Both directions, accept any direction (V.42bis P0=11).

 

 

<compr_neg> Specifies whether or not the modem should continue to operate if the

 

 

 

desired result is not obtained.

 

 

 

+DS0

Do not disconnect if V.42bis is not negotiated by the remote

 

 

 

 

modem as specified in <direction>.

 

 

<max_dict> Specifies maximum number of dictionary entries (2048 entries) that should

 

 

 

be negotiated (may be used by the DTE to limit the code word size

 

 

 

transmitted, based on its knowledge of the data to be transmitted).

 

 

<max_string> Specifies max string length (32 bytes) to be negotiated (V.42bis P2).

Default:

 

3

 

 

Description:

 

This extended-format compound parameter controls the V.42bis data compression

 

 

function if provided in the modem. It accepts four numeric subparameters:

 

 

+DS=[<direction>[,<compr_neg>[,<max_dict>[,<max_string>]]]]

Report Commands:

+DS?

Reports current or selected values.

 

 

+DS=?

Reports supported range of parameter values.

Command: +DS44 V.44 Compression Select

Description:This extended-format compound parameter controls V.44 data compression function.

Values:<direction> The decimal number that specifies the desired direction(s) of operation of the data compression function; from the DTE point of view.

0Negotiated, no compression.

1Transmit only.

2Receive only.

3Both directions, accept any direction. Default

<compress_negotiation> The decimal number that specifies whether or not the modem

should continue to operate if the desired result is not obtained.

0Do not disconnect if V.44 is not negotiated by the remote DCE as specified in <direction>. Default

1Disconnect if V.44 is not negotiated by remote DCE as specified in

<direction>.

<capability> The decimal number that specifies the use of stream method, packet method, multi-packet method.

0Stream method. Default

1Packet method.

2Multi-packet method.

Multi-Tech Systems, Inc. AT Commands Reference Guide (S000273G)

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Multi-Tech Systems MT5600BA-V92 manual Data Compression Commands, Command +DR Data Compression Reporting

MT5600BA-V92 specifications

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