MultiModemDID User Guide

 

Chapter 4 - AT Commands, S-Registers, Result Codes

 

 

Command: +DR=n

V.44 Data Compression Reporting

Values:

n = 0 or 1

Default:

0

 

Description:

Enables or disables the V.44 data compression report. If the

 

compression report is enabled, the +DR:<type> 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 intermediate result

 

code descriptions are shown after the command descriptions.

+DR=0

Disables the V.44 compression report.

+DR=1

Enables the V.44 compression report.

+DR=?

Displays the allowed values.

+DR?

Displays the current value.

+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.

Command: +DS44=n V.44 Data Compression

Values:

See description

Default:

See description

Description:

Controls the V.44 data compression function.

 

The command syntax is +DS44=[direction][,[0][,[0]

 

[,[max_codewords_tx][,[max_codewords_rx][,[max_string_tx]

 

[,[max_string_rx][,[max_history_tx][,[max_history_rx]]]]]]]]]<CR>

 

Subparameters that are not entered retain their current value.

 

Commas separate optional subparameters, and must be inserted

 

to skip a subparameter. Example: +DS44=,,,2048,2048<CR>

 

changes the maximum number of code words in both

 

directions, and keeps all other settings at their current values.

+DS44=? Reports supported options in the format (list of supported

 

direction values), (0), (0), (list of supported max_codewords_tx

 

values), (list of supported max_codewords_rx values), (list of

 

supported max_string_tx values), (list of supported max_string_rx

 

values), (list of supported max_history_tx values), (list of

 

supported max_history_rx values). Example: +DS44: (3, 0), (0),

 

(0), (256-2048), (256-2048), (31-255), (31-255), (512-11008),

 

(512-11008).

+DS44?

Reports current options in the following format:

 

direction, 0, 0, max_codewords_tx, max_codewords_rx,

 

max_string_tx, max_string_rx, max_history_tx, max_history_rx.

 

Example: +DS44: 3, 0, 0, 1024, 1024, 255, 255, 5120, 4096.

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Multi-Tech Systems MT5634ZBA-DID manual Data Compression Reporting, Command +DS44=n V.44 Data Compression