Specifications

February 23, 2000 Motorola Personal Communications Sector Page 39
Satellite Subscriber Products Division
Motorola Personal Communications Sector
Satellite Subscriber Products Division
ISU AT Command Reference Extended Data Compression Commands (+D)
5 Extended Data Compression Commands (+D)
The following commands are used for data compression and are taken from V.25ter, reference [3].
5.1 +DS - Set Data Compression Function
Set Command: +DS=[<direction>[,<comp_neg>[,<max_dict>[,<max_string]]]]
Set the V.42bis data compression function.
<direction> can take on the following values:
0 No compression (default)
1 Transmit only
2 Receive only
3 Both directions
<comp_neg> can take on the following values:
0 Do not disconnect if V.42bis is not negotiated by the remote DCE as specified in <direc-
tion> (default)
1 Disconnect if V.42bis is not negotiated by the remote DCE as specified in <direction>
<max_dict> can take on the following values: 512 to 2048. Default is 512.
<max_string> can take on the following values: 6 to 250. Default is 6.
Read Command: +DS?
Query the current data compression parameter settings. The response is in the form:
+DS: <direction>,<comp_neg>,<max_dict>,<max_dict>
Test Command: +DS=?
List the supported data compression parameters. The response is in the form:
+DS: (supported <direction>s),(supported <comp_neg>s,(supported
<max_dict>s),(supported <max_dict>s)
** Data compression will not work if IRLP is in unacknowledge mode.
5.2 +DR - Data Compression Report Level
Set Command: +DR=[<mode>]
Set the data compression reporting level.
<mode> can take on the following values:
0 Disable data compression reporting (default)
1 Enable data compression reporting
If reporting is enabled, the following intermediate result codes are transmitted by the ISU:
+DR: NONE No data compression
+DR: V42B Data compression in use in both directions
+DR: V42B RD Data compression in use in receive direction only
+DR: V42B TD Data compression in use in transmit direction only