User guide

Command Description
AT%C0 Disables data compression.
AT%C1 Enables MNP 5 data compression.
AT%C2 Enables V.42 bis data compression (sets S46 bit 1).
AT%C3 Enables V.42 bis and MNP 5 data compression (default).
AT%E0 Disables line quality monitor and auto-retrain.
AT%E1 Enables line quality monitor and auto-retrain.
AT%E2 Enables line quality monitor and fallback/fall-forward (default).
AT%L
Line signal level. Returns a value that indicates the received signal level. Example,
009 = -9dBM.
AT%Q
Line signal quality. Reports line signal quality (DAA-dependent). Returns higher
order byte of the EQM value. Based on EQM value, retrain or fallback/fall-forward
may be iniated if enabled with AT%E1 or AT%E2 commands.
AT+MS Select/force modulation.
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
Bell 103 B103 300
Bell 212 B212 1200
V.21 V21 300
V.22 V22 1200
Table E.3: +MS Command Supported Rates
Appendices 84