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Command Description
AT%C0 Disablesdatacompression.
AT%C1 EnablesMNP5datacompression.
AT%C2 EnablesV.42bisdatacompression(setsS46bit1).
AT%C3 EnablesV.42bisandMNP5datacompression(default).
AT%E0 Disableslinequalitymonitor andauto-retrain.
AT%E1 Enableslinequalitymonitor andauto-retrain.
AT%E2 Enableslinequalitymonitor andfallback/fall-forward(default).
AT%L
Linesignallevel.Returnsavaluethat indicatesthereceivedsignallevel.Example,
009=-9dBM.
AT%Q
Linesignalquality.Reportslinesignalquality(DAA-dependent).Returnshigher
order byteoftheEQMvalue.BasedonEQMvalue,retrainor fallback/fall-forward
maybeiniatedifenabledwithAT%E1or AT%E2commands.
AT+MS Select/forcemodulation.
AT+MS modulation selection
This extended-format compound parameter controls the manner of operation of the modulation
capabilities in the modem. It accepts six sub-parameters:
+MS=<carrier>, <automode>, <min_tx_rate>, <max_tx_rate>, <min_rx_rate), <max_rx_
rate><CR>.
To read the current settings, enter AT+MS?<CR>
Modulation Carrier
Possible Minimum, Maximum, Receive and Transmit
Rates
Bell103 B103 300
Bell212 B212 1200
V.21 V21 300
V.22 V22 1200
Table E.3: +MS Command Supported Rates
Appendices 84