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AT Commands
Modem 3600 5-27
Synchronous Transmit Clock Source &X
The &X commands select internal, external, or receive clock as the
transmit clock source.
V.34 Rate Selection Thresholds *TH
The *TH commands sets the V.34 rate selection thresholds. The V.34
modulation dynamically selects the optimum bit rate to run, based on
line quality.
V.34 Asymmetric Bit Rates *AS
The *AS command enables or disables the V.34 asymmetric bit rate
capability. This feature allows the modem to run different bit rates on
the receiver and transmitter.
Modulation *MM
The *MM command sets the current modulation type to use when
attempting to make a connection. Using this command automatically
selects the maximum DCE speed (%B) for the selected modulation.
Command Operation
&X Internal clock
&X1 External clock
&X2 Receive clock
Command Operation
*TH Low V.34 threshold (10
- 6
BER)
*TH1 Medium V.34 threshold (10
- 4
BER)
*TH2 High V.34 threshold (10
- 2
BER)
Command Operation
*AS Disable V.34 asymmetric bit rates
*AS1 Enable V.34 asymmetric bit rates
Command Operation
*MM Automode (typically used on dial line)
*MM1 V.21
*MM2 B103
*MM3 Reserved
*MM4 B212A