Command Reference Manual
100722A
Conexant
3-37
3.2.4 Modulation Control Commands
3.2.4.1 +MS - Modulation Selection
This extended-format compound parameter controls the manner of operation of the modulation capabilities in the modem. It
accepts six subparameters:
Syntax
+MS=[<carrier>[,<automode>[,<min_tx_rate>[,<max_tx_rate>[,<min_rx_rate>[,<max_rx_rate>]]]]]]
Where: Possible <carrier>, <min_tx_rate>, <max_tx_rate>, <min_rx_rate>, and <max_rx_rate values are
listed in are Table 3-2 (see definitions below).
Table 3-2. +MS Command Supported Rates
Modulation <carrier> Possible (<min_rx_rate>, <min_rx_rate>, (<min_tx_rate>), and <max_tx_rate>) Rates (bps)
Bell 103 B103 300
Bell 212 B212 1200 Rx/75 Tx or 75 Rx/1200 Tx
V.21 V21 300
V.22 V22 1200
V.22 bis V22B 2400 or 1200
V.23 V23C 1200
V.32 V32 9600 or 4800
V.32 bis V32B 14400, 12000, 9600, 7200, or 4800
V.34 V34 33600, 31200, 28800, 26400, 24000, 21600, 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
Defined Values
<carrier> A string which specifies the preferred modem carrier to use in originating or answering a
connection. <carrier> values are strings of up to eight characters, consisting only of numeric digits
and upper case letters. <carrier> values for ITU standard modulations take the form: <letter><1-4
digits><other letters as needed>. Defined values are listed in Table 3-2.
<automode> A numeric value which enables or disables automatic modulation negotiation (e.g., ITU-T V.32
bis
Annex A or V.8).
0 = Automode disabled.
1 = Automode enabled. (Default.)
<min_rx_rate> and
<max_rx_rate> Numeric values which specify the lowest (<min_rx_rate>) and highest (<max_rx_rate>) rate at
which the modem may establish a receive connection. May be used to condition distinct limits for
the receive direction as distinct from the transmit direction. Values for this subparameter are
decimal encoded, in units of bit/s. The possible values for each modulation are listed in Table 3-2.
Actual values will be limited to possible values corresponding to the entered <carrier> and fall-
back <carrier> as determined during operation. (Default = lowest (<min_rx_rate>) and highest
(<max_rx_rate>) rate supported by the selected carrier.)
<min_tx_rate> and
<max_tx_rate> Numeric values which specify the lowest (<min_tx_rate>) and highest (<max_tx_rate>) rate at
which the modem may establish a transmit connection. Non-zero values for this subparameter are
decimal encoded, in units of bit/s. The possible values for each modulation are listed in Table 3-2.
Actual values will be limited to possible values corresponding to the entered <carrier> and fall-
back <carrier> as determined during operation. (Default = lowest (<min_tx_rate>) and highest
(<max_tx_rate>) rate supported by the selected carrier.)
