User`s manual

AT Command Reference Manual
1048 3-31
3.3 ERROR DETECTION AND DATA COMPRESSION COMMANDS
3.3.1 AT% Commands
%C - Enable/Disable Data Compression
Enables or disables data compression negotiation. The modem can only perform data compression on an error corrected
link. The parameter value, if valid, is written to S41 bits 0 and 1.
%C0 Disables data compression. Resets S46 bit 1.
%C1 Enables MNP 5 data compression negotiation. Resets S46 bit 1.
%C2 Enables V.42 bis data compression. Sets S46 bit 1.
%C3 Enables both V.42 bis and MNP 5 data compression. Sets S46 bit 1. (Default.)
Result Codes:
OK n = 0, 1, 2, or 3.
ERROR Otherwise.
3.3.2 AT\ Commands
\An - Select Maximum MNP Block Size
The modem will operate an MNP error corrected link using a maximum block size controlled by the parameter supplied. The
parameter value, if valid, is written to S40 bits 6 and 7.
\A0 64 characters.
\A1 128 characters. (Default.)
\A2 192 characters.
\A3 256 characters.
Result Codes:
OK n = 0 to 3.
ERROR Otherwise.
\Bn - 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.
\B1-\B9 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 or connected in fax modem mode.
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.