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X1 Same as X0 plus all CONNECT responses/
blind dialing
X2 Same as X1 plus dial tone detection
X3 Same as X1 plus busy signal detection/
blind dialing
X4 All responses and dial tone and
busy signal detection
Y_ Y0 Modem does not send or respond
to break signals
Y1 Modem sends break signal for four
seconds before disconnecting
Z_ Z0 Reset and retrieve active
configuration profile 0
Z1 Reset and retrieve active configuration
profile 1
3.4 Extended AT Commands
&C_ &C0 Force Carrier Detect Signal High (ON)
&C1 Turn on Carrier Detect signal when
remote carrier signal is present
&D_ &D0 Modem ignores the Data Terminal Ready
signal
&D1 Modem returns to Command Mode after
DTR toggle
&D2 Modem hangs up, returns to the
Command Mode after DTR toggle
&D3 Resets modem after DTR toggle
&F &F Recall factory default configuration
&G_ &G0 Guard tone disabled
&G1 550 Hz guard tone
&G2 1800 Hz guard tone
&J_ &J0 Auxiliary relay never operated
&J1 Activates auxiliary relay when modem is
off-hook
&K_ &K0 Disable flow control
&K3 Enable hardware flow control
&K4 Enable software flow control
&M_ &M0 Asynchronous operation
&P_ &P0 United States setting for off-hook-
(make) to-on-hook (break) ratio
&P1 UK and Hong Kong off-hook-(make) to-
on-hook (break) ratio