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41333, 40000, 38667, 37333, 36000,
34667, 33333, 32000, 30667, 29333,
28000
56 K 56flex 56000, 54000, 52000, 50000, 48000,
46000, 44000, 42000, 40000, 38000,
36000, 34000, 32000
64 Bell 103 300
69 Bell 212 1200
The modem may also automatically switch to another modulation (automode), subject to the
following constraints:
• The modem may not be able to automatically switch from the current modulation (specified
by <mod>) to some other modulation. For example, there is no standard way to automode
from Bell 103 to V.23.
• The DTE may disable automode operation (see <automode> below).
• The DTE may constrain the range of modulations available by specifying the lowest and
highest rates (see <min_rate> and <max_rate> below).
<automode>
Automode is an optional numeric value which enables or disables automatic modulation
negotiation using 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, for example:Bell 212 (<mod> = 69).
For <automode> = 0 (automode disabled, i.e., fixed modulation):
• If <max_rate> is within the rates supported by the selected modulation, the selected rate is
that specified by <max_rate>. For example:
+MS=9,0,1200,4800 selects V.32 4800 bps fixed rate.
• 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=9,0,2400,14400 selects V.32 9600 or 4800 bps.
• To select fixed mode operation (or emulate issuance of the N0S=x command sequence)
specify the <max_rate> and <min_rate> 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=9,0,12000,12000 selects V.32 bis 12000 bps fixed mode (same as N1S37=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, or V.32 bis Annex A if