Chapter 4 - V.22bis Commands
Multi-Tech Systems, Inc. MT2456SMI-22 SocketModem Developer’s Guide
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V.22bis Error Control and Data
Compression Commands
+ESR
Selective Repeat
This extended-format numeric parameter controls the use of the selective repeat (SREJ) option in V.42
.
Syntax
+ESR=[<value>]
Decimal number 0 specifying that SREJ is not used.
Reporting Current or Selected Values:
Command: +ESR?
Response: +ESR: <value>
Example: +ESR: 0 For default setting
+ETBM Call Termination Buffer Management
This extended-format compound parameter controls the handling of data remaining in modem buffers upon call
termination. It accepts three numeric subparameters:
Syntax
+ETBM=[<pending_TD>[,<pending_RD>[,<timer>]]]
Defined Values
<pending_TD> Decimal number 0 specifying that disconnect will occur immediately and all buffered transmit data
will be discarded when the local DTE requests call disconnection.
<pending_RD> Decimal number 0 specifying that disconnect will occur immediately and all buffered receive data
will be discarded when the local DTE requests call disconnection.
<timer>
Decimal number 0 specifying that the modem will not attempt to deliver the buffered data before
abandoning the attempt and discarding remaining data.
Reporting Current or Selected Values
Command: +ETBM?
Response: +ETBM: <pending_TD>,<pending_RD>,<timer>
Example: +ETBM: 0,0,0
Reporting Supported Range of Parameter Values
Command: +ETBM=?
Response: +ETBM: (<pending_TD> range),(<pending_RD> range),(<timer> range)
Example: +ETBM: (0),(0),(0)
\B
Transmit Break to Remote
In non-error correction mode, the modem will transmit a break signal to the remote modem with a length in multiples
of 100 ms according to parameter specified. If a number in excess of 9 is entered, 9 is used. The command works in
conjunction with the \K command
.
In error correction mode, the modem will signal a break through the active error correction protocol, giving no
indication of the length.
Syntax
\B<value>
Defined Values
<value>
Decimal number corresponding to the selected option.
1-9
Break length in 100 ms units. (Default = 3.)
(Non-error corrected mode only.)
Result Codes
OK
If connected in data modem mode
NO CARRIER If not connected.
Note:
When the modem receives a break from the remote modem, break is passed to the DTE as follows: In non-
error correction mode direct, the break length is passed; in non-error correction mode normal and in error correction
mode, a 300 ms break is passed.
