Multitech MultiModem ZBA Series At Commands Reference Manual page 19

Command: +DS44=n V.44 Data Compression
Values:
Default:
Description:
Multi-Tech Systems, Inc. AT Commands for the MT5634 Family of Products (S000272J)
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See description
See 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.
Subparameters
direction Specifies the DTE direction of the data compression.
0 No compression.
3 Compression in both directions (default).
max_codewords_tx Specifies the maximum number of code words to be negotiated in the
transmit direction.
1024 Default.
256–2048 Maximum number of code words in transmit direction.
Specifies the maximum number of code words to be negotiated in the
max_codewords_rx
receive direction.
1024 Default.
256–2048 Maximum number of code words in receive direction.
Specifies the maximum string length to be negotiated in the transmit
max_string_tx
direction.
255 Default.
31–255 Maximum string length in transmit direction.
Specifies the maximum string length to be negotiated in the
max_string_rx
receivedirection.
255 Default.
31–255 Maximum string length in receivedirection.
Specifies the maximum length of the history buffer to be negotiated in the
max_history_tx
transmit direction.
5120 Default.
512–11008 History buffer size in transmit direction.
max_history_rx Specifies the maximum length of the history buffer to be negotiated in the
receive direction.
4096 Default.
512–11008 History buffer size in receive direction
Chapter 1 – AT Commands
19