User guide

Appendices 71
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>
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.
Table D.2: Basic AT Commands (Continued)
Command Description
Table D.3: +MS Command Supported Rates
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
V.22 bis V22 2400 or 1200
V.23 V23C 1200rx/75tx or 75rx/1200tx
V.32 V32 9600 or 4800
V.32 bis V32B 14400, 12000, 9600, 7200 or 4800
V.34 V34 33600, 31200, 28800, 26400, 19200, 16800, 14400, 12000,
9600, 7200, 4800 or 2400
V.90 V90 56000, 54667, 53333, 52000, 50667, 49333, 48000, 46667,
45333, 42667, 41333,, 40000, 38667, 37333, 36000, 34667,
33333, 32000, 30667, 29333, 28000
K56flex K56 56000, 54000, 52000, 50000, 48000, 46000, 44000, 42000,
40000, 38000, 36000, 34000, 32000