Siemens M20 Terminal Technical Description page 48

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AT+DS V.42bis data compression control
Test command Response
AT+DS=? +DS: (list of supported <p0>s), (list of supported <n>s), (list of supported <p1>s), (list of suppor-
ted <p2>s) OK
Parameter
see set command
Read command Response
AT+DS? +DR: <p0>,<n>,<p1>,<p2> OK
Parameter
see set command
Set command Response
AT+DS=[<p0>[,< This parameter setting determines the possible data compression mode by TA at the compression
n>[,<p1>[,<p2>]]]] negotiation with the remote TA after call setup.
Note1: only for data call
Note2: GSM transmits the data transparent. The remote TA may support this compression.
OK
Parameter
Note:
<p0>
<n>
<p1>
Note:
<p2>
Reference Note
V.25ter Functionality depends on network
AT+GCAP Request complete TA capabilities list
Test command Response
AT+GCAP=?
OK
Parameter
Execute command Response
AT+GCAP TA reports a list of additional capabilities.
+GCAP: <name>
OK
Parameter
<name>
Reference Note
V.25ter
Version 8 dated 15.03.00
see also ITU V.42bis
0
1
2
3
0
1
512-1024
default determined by manufacturer
6-64
e.g.: +CGSM, +FCLASS, +DS, +DR
NONE
transmit only
receive only
both directions, but allow negotiation
allow negotiation of p0 down
do not allow negotiation of p0 – disconnect on difference
dictionary size
maximum string size
AT command interface
A
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