US Robotics 56K USB Modem User Manual page 44

Table 66. +DCS Extended Syntax Commands
Command
+DCS=<v42bis>,<v44>
+DCS?
+DCS=?
+DR<value>—Data Compression Reporting
Use this command to enable or disable the 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).
Result codes:
• OK if <value> = 0, 1.
ERROR if <value> ≠ 0, 1.
•
Table 67. +DR Data Compression Report Value
Command
+DR=0 Disables the compression report.
+DR=1 Enables the compression report.
Table 68. +DR Data Compression Reporting Intermediate Result Codes
Result Code
+DR: NONE Data compression is not in use.
+DR: V42B V.42bis is in use in both directions.
+DR: V44 V.44 is in use in both directions.
Table 69. +DR Extended Syntax Commands
Command
+DR=<value>
+DR?
+DR=?
+DS=<direction>,<compression_negotiation>,<max_dict>,<max_string>—
V.42bis Data Compression
Use the +DS command to configure the V.42bis 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 the %C<value> command.
Result codes:
• OK if <direction> = 0, 3 and <compression negotiation> = 0, <max_dict> = 1024, <max_string> = 32.
ERROR if <direction> ≠ 0, 3 or <compression negotiation> ≠ 0, <max_dict> ≠ 1024, <max_string> ≠
•
32.
The <direction> parameter sets which directions use the compression method. USRobotics controller-
based products use compression in both directions or no compression at all.
Description
Configures compression algorithms.
Displays the current data compression configuration.
Displays the valid +DCS parameter values.
Function
Description
Turns the data compression report result code on or off.
Displays the current status of the data compression report result code.
Displays all of the supported values for the <value> parameter.
56K USB Modem
Description
Command Reference - 38
User Guide