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4 AT Commands, S-Registers, and Result Codes
32
MultiModemZPX User Guide
Command: +DCS=
x,y
Select V.44 Data Compression
Values: x = 0 or 1 (V.42bis)
y = 0, 1, or 2 (V.44)
Default: 1,2
Description: Selects V.42bis/V.44 data compression.
+DCS=0,0 V.42bis and V.44 data compression are both disabled.
+DCS=0,1 V.42bis is disabled; V.44 data compression is acceptable.
+DCS=0,2 V.42bis is disabled; V.44 only when connected to a V.92 server.
+DCS=1,0 V.42bis is acceptable; V.44 data compression is disabled.
+DCS=1,1 V.42bis is acceptable; V.44 data compression is acceptable.
+DCS=1,2 V.42bis is acceptable; V.44 only when connected to a V.92 server.
+DCS=? Displays the allowed values.
+DCS? Displays the current value.
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 direc-
tions, and keeps all other settings at their current values.
+DS44=? Reports supported options in the format (list of supported di-
rection values), (0), (0), (list of supported max_codewords_tx val-
ues), (list of supported max_codewords_rx values), (list of sup-
ported max_string_tx values), (list of supported max_string_rx
values), (list of supported max_history_tx values), (list of sup-
ported max_history_rx values). Example: +DS44: (3, 0), (0), (0),
(256-2048), (256-2048), (31-255), (31-255), (512-11008), (512-11008).