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Chapter 3 - AT Commands
&Gn Guard Tones
n = 0, 1, or 2
Default: &G0 (models outside U.K.)
&G2 (U.K. models only)
The &G command is used to control the presence or absence of guard tones from the
transmitter when in answer mode at either 1200 or 2400 bps. Guard tones are used in
Europe and other areas to allow the modem to function in the telephone systems. Guard
tones are not used in the United States. U.K. models are locked at &G2 (1800 Hz guard
tone).
&G0 disables ITU-T guard tones.
&G1 enables ITU-T 550 Hz guard tone.
&G2 enables ITU-T 1800 Hz guard tone.
*Hn Busy-Out After Disconnect
n = 0 or 1
Default: *H0
The *H1 command causes the MT2834MR6 to remain out of service and return a busy
signal until configuration from the MultiModemManager dedicated management console
has finished. If no configuration option is set on the dedicated management console, the
MT2834MR remains out of service for ten seconds after disconnect. Register S94 controls
the length of the out-of-service, or busy-out, time (see Chapter 4).
*H0 disables busy-out after disconnect.
*H1 enables busy-out after disconnect.
&Pn Set Pulse-Dial Ratios
n = 0 or 1
Default: &P0 (Models outside U.K.)
&P1 (U.K. models only)
The &P command sets the time ratios between the open (break) and closed (make) states
of dialing pulses. U.K. models are locked to &P1 (67:33 ratio). See Appendix B for more dial
pulse information.
&P0 sets a pulse dial ratio of 60 ms break to 40 ms make.
&P1 sets a pulse dial ratio of 67 ms break to 33 ms make.
&RDn Square Wave Ring Detect
n = 0 or 1
Default: &RD0 (U.K. and International models)
&RD1 (North American models)
The ringback sound that you hear when you dial a number is generated at the local
telephone office or PBX. Normally, it is a sine wave analog tone. However, some PBXs
generate square wave rings that can go undetected by normal ring detection circuits,
resulting in a failure to make a connection. To enable your modem to detect square wave
rings, use the &RD1 command.
&RD0 enables sine wave ring detection only.
&RD1 enables sine wave and square wave ring detection.