Multitech MultiModem ZBA Series At Commands Reference Manual page 20

Command:
Values:
Defaults:
Description:
Multi-Tech Systems, Inc. AT Commands for the MT5634 Family of Products (S000272J)
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+MS= Modulation Selection
See description.
See description.
This extended-format command selects modulation, enables or disables automode, and
specifies the highest downstream and upstream connection rates using one to four
subparameters.
The command syntax is:
+MS= [mod][,[automode][,[0][,[max_rate][,[0][,[max_rx_rate]]]]]]<CR>
Subparameters that are not entered retain their current value. Commas separate optional
subparameters, and must be inserted to skip a subparameter. Example: +MS=,0<CR>
disables automode and keeps all other settings at their current values.
+MS=? Reports supported options in the format (list of supported mod values),(list of supported
automode values),(0),(list of supported max_rate values),(0),(list of supported max_rx_rate
values). Example: +MS: (BELL103, V21, BELL212A, V22, V22B, V23C, V32, V32B, V34,
V90, V92), (0, 1), (0), (0-33600), (0), (0-56000)
+MS? Reports current options in the format mod, automode, 0, max_rate, 0, max_rx_rate.
Example: +MS: V92, 1, 0, 31200, 0, 56000.
Subparameters
mod Specifies the preferred modulation (automode enabled) or the modulation to use
in originating or answering a connection (automode disabled). The default is V92.
mod
2
V92
3
V90
V34
V32B
V32
V22B
V22
V23C
V21
Bell212A
Bell103
Notes:
1. See optional <automode>, <max_rate>, and <max_RX_rate> subparameters.
2. Selects V.92 modulation as first priority. If a V.92 connection cannot be established, the
modem attempts V.90, V.34, V.32bis, etc.
3. Selects V.90 modulation as first priority. If a V.90 connection cannot be established, the
modem attempts V.34, V.32bis, etc.
An optional numeric value that enables or disables automatic modulation
automode
negotiation using V.8 bis/V.8 or V.32 bis Annex A. Automode is disabled if values
are specified for the max_rate and max_rx_rate parameters. The options are:
0 Disable automode
1 Enable automode (default)
max_rate An optional number that specifies the highest rate at which the modem may
establish an upstream (transmit) connection. The value is decimal coded in units
of bps, for example, 33600 specifies the highest rate to be 33600 bps.
0 Maximum rate value limited by the modulation selected in mod (default).
300–33600 Maximum rate value limited by the modulation selected in mod. For
valid max_rate values for each mod value, see the following table:
mod value
V92, V90, V34
V32B
V32
V22B
V22, V23C, Bell212A
V21, Bell103
max_rx_rate An optional number that specifies the highest rate at which the modem may
establish a downstream (receive) connection. The value is decimal coded in bps
units; e.g., 28800 specifies the highest rate to be 28800 bps.
0 Maximum rate determined by the modulation selected in mod (default).
300–56000 Maximum rate value limited by the modulation selected in mod. See
"Possible rates" in the mod table.
Modulation Possible rates (bps)
V.92 56000, 54666, 53333, 52000, 50666, 49333, 48000, 46666,
45333, 44000, 42666, 41333. 40000, 38666, 37333, 36000,
34666, 33333, 32000, 30666, 29333, or 28000
V.90 56000, 54666, 53333, 52000, 50666, 49333, 48000, 46666,
45333, 44000, 42666, 41333. 40000, 38666, 37333, 36000,
34666, 33333, 32000, 30666, 29333, or 28000
V.34 33600, 31200, 28800, 26400, 24000, 21600,19200, 16800,
14400, 12000, 9600, 7200, 4800, or 2400
V.32bis 14400, 12000, 9600, 7200, or 4800
V.32 9600 or 4800
V.22bis 2400 or 1200
V.22 1200
V.23 1200
V.21 300
Bell 212A 1200
Bell 103 300
Valid max-rate values (bps)
31200, 28800, 26400, 24000, 21600,19200, 16800, 14400,
12000, 9600, 7200, 4800, 2400
19200, 16800, 14400, 12000, 9600, 7200, 4800
14400, 12000, 9600, 7200, 4800
2400
1200
300
Chapter 1 – AT Commands
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