Black Box 3600 MODEM manual Synchronous Transmit Clock Source &X, Rate Selection Thresholds *TH

AT Commands

Synchronous Transmit Clock Source &X

The &X commands select internal, external, or receive clock as the transmit clock source.

Command	Operation
&X	Internal clock
&X1	External clock
&X2	Receive clock

V.34 Rate Selection Thresholds *TH

The *TH commands sets theV.34 rate selection thresholds. TheV.34 modulation dynamically selects the optimum bit rate to run, based on line quality.

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)

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.

Command	Operation
*AS	Disable V.34 asymmetric bit rates
*AS1	Enable V.34 asymmetric bit rates

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
*MM	Automode (typically used on dial line)
*MM1	V.21
*MM2	B103
*MM3	Reserved
*MM4	B212A

Modem 3600 5-27