Multi-Tech Systems MT2456SMI22 - Manual (Page 27)

Chapter 4 - V.22bis Commands
Multi-Tech Systems, Inc. MT2456SMI-22 SocketModem Developer’s Guide 27
V.22bis Modulation Control Commands
+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=[[,[,[,[,[,]]]]]]
Table of +MS Command Supported Rates
Modulation Possible (, , (),
and ) 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.22bis V22B 2400 or 1200
V.23 V23C 1200
Defined Values
A string which specifies the preferred modem carrier to use in originating or answering a connection.
values are strings of up to eight characters, consisting only of numeric digits and upper case
letters. values for ITU standard modulations take the form: <1-4 digits>as needed>.
A numeric value which enables or disables automatic modulation negotiation (e.g., V.22bis).
0 = Automode disabled.
1 = Automode enabled. (Default)
and
Numeric values which specify the lowest () and highest () 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. Actual values will be limited to possible values corresponding to the entered and
fall-back as determined during operation. (Default = lowest () and highest
() rate supported by the selected carrier.)
and
Numeric values which specify the lowest () and highest () rate at which the
modem may establish a transmit connection. Non-zero values for this subparameter are decimal
encoded, in units of bit/s. Actual values will be limited to possible values corresponding to the entered
and fall-back as determined during operation. (Default = lowest () and
highest () rate supported by the selected carrier.)
Reporting Current or Selected Values
Command: +MS?
Response: +MS:,,, ,,
Example: +MS: V22B, 1,300,2400,300,2400
For default values. This example allows maximum system flexibility to determine optimal receive and transmit rates
during operation.
Reporting Supported Range of Parameter Values
Command: +MS=?
Response: +MS: (< carrier> range),( range),( range),( range),
( range), ( range)
Example 1: +MS:(B103,B212,V21,V22,V22B,V23C),(0,1),(300-2400),(300-2400),(300-2400),(300-2400)
Result Code
OK Valid subparameter string
ERROR Otherwise