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Chapter 4 - V.22bis Commands
Multi-Tech Systems, Inc. MT2456SMI-22 SocketModem Developer’s Guide 28
%E Enable/Disable Line Quality Monitor and Auto-Retrain
Controls whether or not the modem will automatically monitor the line quality and request a retrain (%E1). The
parameter value, if valid, is written to S41 bits 2 and 6. If enabled, the modem attempts to retrain for a maximum of 30
seconds.
Syntax %E<value>
Defined Values
<value> Decimal number corresponding to the selected option.
0 Disable line quality monitor and auto-retrain.
1 Enable line quality monitor and auto-retrain. (Default)
Result Codes
OK <value> = 0 or 2.
ERROR Otherwise.
B ITU-T or Bell
When the modem is configured to allow either option, the modem will select Bell or ITUT modulation for a line speed
connection of 300 or 1200 bps. Any other line speed will use an ITU-T modulation standard. The parameter value, if
valid, is written to S27 bit 6..
Syntax
B<value>
Defined Values
<value> Decimal number corresponding to the selected option.
0 Selects ITU-T operation at 300 or 1200 bps during Call Establishment and a subsequent connection. (Default)
1 Selects Bell operation at 300 or 1200 bps during Call Establishment and a subsequent connection.
2 Selects V.23 half-duplex operation at 1200 bps during Call Establishment and a subsequent connection.
3 Disables V.23 half-duplex operation.
Result Codes
OK <value> = 0 or 3
ERROR Otherwise