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V.42/V.42bis MNP AT Commands
Data Error Correction and Compression
Your modem supports two types of error correction (MNP2-4 and V.42)
and data compression (MNP5 and V.42 bis). V.42 error correction uses
LAPM as the primary error-control protocol and uses MNP2-4 as an
alternate. V.42 bis data compression requires V.42 (LAPM only). MNP5
requires MNP2-4. The supported V.42 bis/MNP AT commands are listed
below:
Table 2. V.42/V.42 bis MNP AT Commands
Command Description
%An Set auto-reliable fallback character (Default=13)
%Cn MNP 5 data compression control (Default=1)
%C0 No compression
%C1 Enables MNP5 data compression
\An MNP Block Size (Default=3)
\A0 64 characters (This improves throughput on noisy phone line)
\Al 128 characters
\A2 192characters
\A3 256 characters
\Bn Transmit Break
\Cn Set auto-reliable buffer (Default=0)
\C0 No data buffering
\C1 Four-second buffer until 200 characters in the buffer or
detection of a SYN character
\C2 No buffering. Connects non-V.42 modems to V.42 modem
\Gn Set modem port flow control (Default=0)
\G0 Disable port flow control.
\G1 Set port flow control to XON/XOFF
\Jn Bps rate adjusts control (Default=0)
\J0 Disables rate adjust
\J1 Enables rate adjust
\Kn Set break control (Default=5)
In connect state, transmits break to remote (if in reliable mode):
\K0,2,4 Enters command mode, no break sent
\K1 Destructive/expedited