&T1
Initiate local analog loopback.
&T2
Returns ERROR result code.
&T3
Initiate local digital loopback.
&T4
Allow remote digital loopback.
&T5
Disallow remote digital loopback request.
&T6
Request an RDL without self-test.
&T7
Request an RDL with self-test.
&T8
Initiate local analog loop with self-test.
&V
Display current configurations.
&W0
Store the active profile in NVRAM profile 0.
&W1
Store the active profile in NVRAM profile 1.
&X0
Select internal timing for the transmit clock.
&X1
Select external timing for the transmit clock.
&X2
Select slave receive timing for the transmit clock.
&Y0
Recall stored profile 0 upon power up.
&Y1
Recall stored profile 1 upon power up.
&Zn=x Store dial string x (to 35) to location n (0 to 3 depending upon modem model).
%E0
Disable line quality monitor and auto retrain.
%E1
Enable line quality monitor and auto retrain.
%E2
Enable line quality monitor and fallback/fall forward.
%L
Return received line signal level.
%Q
Report the line signal quality.
\D1
Enable Auto Dial via DTR off to on sequence *PE14400 only
\D0
Disable Auto Dial (default) *PE14400 only
\G0
Disable modem to modem flow control.
\G1
Enable modem to modem flow control.
\H0
Command Mode default
\H1
Lease Line Mode