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Chapter 5 – AT Commands, S-Registers, and Result Codes
Multi-Tech Systems, Inc. SocketModem MT5600SMI Developer’s Guide 51
Modulation Control Commands
Command: +MS Modulation Selection
Description: 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 Table 5-3.
Table 5-3. +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
56K K56 56000, 54000, 52000, 50000, 48000, 46000, 44000, 42000,
40000, 38000, 36000, 34000, 32000
V.90 V90 56000, 54667, 53333, 52000, 50667, 49333, 48000, 46667,
45333, 44000, 42667, 41333, 40000, 38667, 37333, 36000,
34667, 33333, 32000, 30667, 29333, 28000
V.92
downstream
V92 56000, 54667, 53333, 52000, 50667, 49333, 48000, 46667,
45333, 44000, 42667, 41333, 40000, 38667, 37333, 36000,
34667, 33333, 32000, 30667, 29333, 28000
V.92
upstream
V92 48000, 46667, 45333, 44000, 42667, 41333, 40000, 38667,
37333, 36000, 34667, 33333, 32000, 30667, 29333, 28000,
26667, 25333, 24000
Note: Some <carrier> values may not be supported by certain model models. For
example, modem models supporting V92 may not support K56.
Defined Values: <carrier> A string that 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 5-3.
<automode> A numeric value which enables or disables automatic
modulation negotiation (ITU-T V.32bis 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 5-3. 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.)