US Robotics 56K USB Modem User Manual page 46

Table 73. Valid <max_codewords_tx> and <max_codewords_rx> Values
Value
1024
256—2048
The <max_string_tx> parameter specifies the maximum string length to negotiate in the transmit direction.
The <max_string_rx> parameter specifies the maximum string length to negotiate in the receive direction.
Table 74. Valid <max_string_tx> and <max_string_rx> Values
Value
255
31—255
The <max_history_tx> parameter specifies the maximum length of the history buffer to negotiate in the
transmit direction. The <max_history_rx> parameter specifies the maximum length of the history buffer to
negotiate in the receive direction.
Table 75. Valid <max_history_tx> and <max_history_rx> Values
Value
5120
4096
512—11008
Table 76. +DS44 Extended Syntax Commands
Command
+DS44=<direction>,0,0,
<max_codewords_tx>,<max_codewords_rx>,
<max_string_tx>,<max_string_rx>,
<max_history_tx>,<max_history_rx>
+DS44?
+DS44=?
+EB=<break_selection>,<timed>,<default_length>—Break Handling In Error Con-
trol Operation
Use this command to set the modem behavior when a BREAK is received. Table 77 lists the valid break
selection values. The valid values for default length are 10—90 in steps of 10, with a default for this field of
30. Each increment of the <default_length> parameter indicates 10 ms of time.
Result codes: Command usage example, both are valid: AT+EB=1,0,10 or AT+EB=1,,10.
• OK if <break_selection> = 0—3 and <timed>
1. ITU-T Recommendation V.250 (05/98) standardized this command. The <timed> parameter in the recommendation allows for V.42
L-SIGNALs to indicate a break length. The controller-based AT command set does not support this option. For more information
on the standardized version of this command, refer to ITU-T Recommendation V.250.
2. ITU-T Recommendation V.250 (05/98) standardized this command. The <default length> parameter in the recommendation allows
for break length from 10 ms to 2.54 s. The controller-based AT commands set only supports break lengths between 10 ms and 90
ms. For more information on the standardized version of this command, refer to ITU-T Recommendation V.250.
Default <max_codewords_tx> and <max_codewords_rx> value.
Valid transmit and receive code word settings.
Default <max_string_tx> and <max_string_rx> value.
Valid transmit and receive string lengths.
Default <max_history_tx> value.
Default <max_history_rx> value.
Valid maximum transmit and receive history buffer sizes.
1
Meaning
Meaning
Meaning
Description
Configures modem V.44 compression method.
Displays the current V.44 compression configuration.
Displays the supported V.44 compression setting.
= 0 and <default_length>
56K USB Modem
User Guide
2
= 10—90 in increments of 10.
Command Reference - 40