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AT Commands for V.42/V.42bis

The following AT commands apply to the V.42/V.42bis

protocol:

Compression Control. Determines whether or not modem will

use data compression.

AT%C0 disables data compression

AT%C1 enables MNP5 data compression negotiation

AT%C2 enables V42bis data compression

AT%C3 enables both V.42bis and MNP5 data compression

(DEFAULT)

Auto-retrain. Determines whether or not the modem

automatically monitors the line quality and requests a retrain

when necessary.

AT%E0 disables line quality monitor auto-retrain

AT%E1 enables line quality monitor auto-retrain

AT%E2 enables line quality monitor auto retrain and auto

fall back/forward. (DEFAULT)

Report Received Signal Level.

AT%L 009 = -9 dBm, 010 = -10dBm, etc. all the way to 043

(-43 dBm)

Line signal and noise are determined by the unit of

measurement dBm (decibel referenced to one milliwatt). To

arrive at a signal/noise ratio, the noise level is subtracted from

signal level in dBm.

Modem Command Reference

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