PCI Modem Card User's Manual
48
+DR Data Compression Report Value
+DR=0
This command disables the compression report.
+DR=1
This command enables the compression report.
+DR Data Compression Reporting Intermediate Result Codes
+DR: NONE
Data compression is not in use.
+DR: V42B
V.42 bis is in use in both directions.
+DR: V42B RD
V. 42 bis is in use in the receive direction.
+DR: V42B TD
V. 42 bis is in use in the transmit direction.
+DR: V44
V.44 is in use in both directions.
+DR: V44 RD
V.44 is in use in the receive direction.
+DR: V44 TD
V.44 is in use in the transmit direction.
+DS=<direction>,<compression_negotiation>,<max_dict>,<max_string>
—V. 4 2 bis Data Compression
Use the
+DS
command to configure the V.42 bis data compression method
used by the modem. The settings of this command overwrite the setting of a
%C<value>
command. However, it can also be overwritten by
%C<value>
command.
The <direction> parameter sets which directions use the compression method.
The soft modem use compression in one or both directions.
Valid <direction> Values:
0
Modem negotiates no V.42 bis compression.
1
Modem negotiates transmit only V.42 bis compression.
2
Modem negotiates receive only V.42 bis decompression.
3
Modem accepts V.42 bis compression in both or either
direction (default).
The <compression_negotiation> parameter tells the modem whether it should
disconnect if V.42 negotiations fail.
The soft modem AT command set does not support the disconnect feature
when V.42 negotiation fails and the <compression_negotiation> parameter is
always set to 0. The <max_dict> and <max_string> parameters specify the
maximum number of dictionary entries and maximum string length for the
modem to negotiate. Their default values are 4096 and 32, respectively.
+DS44=<direction>,<compression_negotiation>, <capability>,
<max_codewords_tx>,<max_codewords_rx>,<max_string_tx>,<max_str
ing_rx>,<max_history_tx>,<max_history_rx>—V.44 Data Compression
