Multi-Tech Systems MT2456SMI22 manual 22bis Error Control and Data Compression Commands

Chapter 4 - V.22bis Commands

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.

Multi-Tech Systems, Inc. MT2456SMI-22 SocketModem Developer’s Guide 29