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258 Perle 833IS User Guide
lowest and highest rates (see <min_rate> and <max_rate> below).
<automode> is an optional numeric value which enables or disables automatic
modulation negotiation using V.8 bis/V.8 or V.32 bis Annex A. The options are:
The default value is 1, which enables automode. Note, however, there are
modulations for which there is no automatic negotiation, e.g., Bell 212 (<mod> =
69).
For <automode> = 0 (automode disabled, i.e., fixed modulation):
a. If <max_rate> is within the rates supported by the selected modulation, the
selected rate is that specified by <max_rate>. For example:
+MS=10,0,1200,4800 selects V.32 bis 4800 bps fixed rate.
b. If <max_rate> is greater than the highest speed supported by the modulation
specified by <mod>, the starting rate is the highest rate supported by the
selected modulation. For example:
+MS=10,0,2400,14400 selects V.32 bis 14400, 12000, 9600, 7200, or 4800 bps.
c. 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
+MS=10,0,12000,12000 selects V.32 bis 12000 bps fixed mode
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.
d. 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:
e. +MS=10,1,1200,24000 selects automoding down from V.32 bis 14400 bps.
<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
300Êbps.
<automode> Option Selected Notes
Automode disabled
Automode enabled using V.8 bis/V.8 or V.32 Annex A Default