US Robotics 56K USB Modem User Manual page 41

Table 52. %C<value> Commands
Command
%C0 V.44/V.42bis/MNP 5 disabled. No data compression.
%C1 V.44/V.42bis/MNP 5 enabled. Data compression enabled (default).
%E<value>—Auto Fallback/Fallforward Control
This command provides the option for the modem to automatically monitor line quality, to fall back when
line quality is insufficient, and to fall forward when line quality is sufficient.
Result codes:
• OK if <value> = 0—2.
ERROR if <value> ≠ 0—2.
•
Table 53. %E<value> Commands
Command
%E0 Disables fallback/fallforward.
%E1 Enables fallback and disables fallforward.
%E2 Enables fallback/fallforward (default).
+A8E=<v8o>,<v8a>,<v8cf>,<v8b>—V.8 and V.8bis Operation Controls
Use this command to set the control parameters for early call negotiation through V.8 and V.8bis. +A8E*
may also be used as an action command to reinitiate V.8 or V.8bis if an earlier attempt to use either
protocol has failed.
<v8o> enables or disables DCE-controlled V.8 origination negotiation; <v8a> enables or disables DCE-
controlled V.8 answer negotiation; <v8b> disables V.8 negotiation or sets it to DCE controlled or DTE
controlled negotiation. The <v8cf> parameter contains the V.8 CI signal call function octet (refer to V8
document for details). Call function octet <v8cf> accepts values in the range 0-FF. The default values are
<v8o> = 1, <v8a> = 1, and <v8cf> = C1.
Result codes:
• OK if <v8o> = 1, 6 and <v8a> = 1, 5 and <v8cf> = 0-FF and <v8b> = 0—2.
ERROR if <v8o> ≠ 1, 6 or <v8a> ≠ 1, 5 or <v8cf> ≠ 0-FF or <v8b> ≠ 0—2.
•
The following parameter values are supported when V.80 is enabled.
Table 54. Valid <v8o> Values
Value
1 Enables DCE-controlled V.8 origination negotiation (default).
6 Enables DCE-controlled V.8 origination negotiation, issues +A8x indications.
Table 55. Valid <v8a> Values
Value
1 Enables DCE-controlled V.8 answer negotiation (default).
5 Enables DCE-controlled V.8 answer negotiation, issues +A8x indications.
Note: ITU-T Recommendation V.251 (02/98) standardized this command. However, the controller-based command set only includes
partial support for the standard. For complete details of the standard form of this command, refer to Recommendation V.251.
Function
Function
Meaning
Meaning
56K USB Modem
User Guide
Command Reference - 35