|
| 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
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