AT Command Reference Manual
1048
3-27
c.
To emulate issuance of the N0S37=x command sequence to select fixed mode operation, specify the
<max_rate> and <min_rate> both to be the (same) requested speed, and <mod> to be the modulation for that
speed. For example:
+MS=11,0,16800,16800 selects V.34 16800 bps fixed mode (no comparable S37 command).
+MS=10,0,12000,12000 selects V.32 bis 12000 bps fixed mode (same as N0S37=10).
For <automode> = 1 (automode enabled, i.e., automatically selected speed and modulation):
The modem connects at the highest possible rate in accordance with V.8 bis/V.8, or V.32 bis Annex A if V.8 bis/V.8 is
not supported by the remote modem.
a.
If <max_rate> is greater than the highest rate supported by the modulation specified by <mod>, the modem
automodes down from the highest rate of the selected modulation. For example:
+MS=10,1,1200,24000 selects automoding down from V.32 bis 14400 bps.
b.
To emulate issuance of the N1S37=x sequence command, specify the modulation and the rate to start
automoding down from using <mod> and <max_rate>, respectively. Set <min_rate> to 300 to allow automoding
all the way down to V.21 300 bps. For example:
+MS=11,1,300,16800 selects automode starting at V.34 16800 bps (no comparable S37 command).
+MS=9,1,300,12000 selects automode starting at V.32 bis 12000 bps (same as N1S37=10).
3.
<min_rate> is an optional number which specifies the lowest rate at which the modem may establish a connection. The
value is decimal coded, in units of bps, e.g., 2400 specifies the lowest rate to be 2400 bps. The default is 300 for
300 bps.
4. <max_rate> is an optional number which specifies the highest rate at which the modem may establish a connection. The
value is decimal coded, in units of bps, e.g., 14400 specifies the highest rate to be 14400 bps. The default is 28800 for
28800 bps.
5. <x_law> is an optional number which specifies the codec type. The options are:
0 =
µ
-Law
1 = A-Law
Note that ATZ will reset the <x_law> selection to 0 (
µ
-Law).
6.
<rb_signaling> is an optional number which enables or disables robbed bit signaling generation in a server modem or
enables or disables robbed bit signaling detection in a client modem. The options are:
0 = Robbed bit signaling generation (server modem ) or detection (client modem) disabled (default)
1 = Robbed bit signaling generation (server modem ) or detection (client modem) enabled
Note that ATZ will reset the <rb_signaling> selection to 0 (disabled).
Result Codes:
OK
Valid subparameter string
ERROR
Otherwise.
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