- MultiConnect Adapter User Guide

Chapter 10 − Modem Mode AT Commands, S-Registers, and Result Codes
Multi-Tech Systems, Inc. MultiConnect Serial-to-Serial Adapter User Guide (S000354A) 107
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.
Table 8-1. +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 8-1.
<automode> A numeric value which enables or disables automatic modulation negotiation
(ITU-T V.3
2bis 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 8-1. 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 8-3.
Actual values will be limited to possible values corresponding to the entered
<carrier> and fall-back <carrier> as determined during operation. (Default =
lowest (<min_tx_rate>) and highest (<max_tx_rate>) rate supported by the
selected carrier.)
Reporting Current or Selected Values
Command: +MS?
Reporting Supported Range of Parameter Values
Command: +MS=?
Result Code: OK - Valid subparameter string
Otherwise ERROR