Paradyne 3821PLUS Dn ± DTR Action, Fn ± Select Factory Default Configuration Options, Disable

COMSPHERE 3821Plus Modem

Table 4-1

(6 of 13)

3821Plus AT Commands

&Dn ± DTR Action

Data Terminal Ready (DTR) is a signal from the DTE to the modem indicating that the DTE is connected and ready for operation.

&D0	Ignore. Modem ignores the true status of DTR and treats it as always ON.
&D1	Off=Command Mode. Modem enters online Command Mode if connected when DTR switches off.
&D2	Standard RS232. DTR Signal is controlled by the DTE.
&D3	Off=Reload Strap. Follows Standard RS232 operation, except that when DTR switches Off, the
	modem loads the Active (Saved) area into the Active (Operating) area.
&D4	Controls On-Hook. Follows Standard RS232 operation, except that modem does not disconnect
	until DTR is lowered by the DTE.
&D6	Off=Restrap to Async Dial. The factory default template Async Dial is loaded when DTR switches off.

&Fn ± Select Factory Default Configuration Options

Loads factory configuration options into the Active (Operating) area. &F5 and &F6 are valid only for the North America country code, and only if ETC is installed.

&F0	Async Dial
&F1	Sync Dial
&F2	Sync Leased (Answer Mode)
&F3	UNIX Dial
&F4	Sync Leased (Originate Mode)
&F5	Cellular (Mobile)
&F6	Cellular (PSTN)

&Gn ± V.22bis Guard Tone

Determines whether the V.22bis guard tone is disabled, set to 550 Hz, or set to 1800 Hz.

&G0	Disable
&G1	550 Hz
&G2	1800 Hz

NOTE: The default and permitted settings of this option are country-dependent. See Appendix H.

4-8 January 1999 3821-A2-GB20-40