From: utzoo!decvax!cca!knutsen@sri-unix
Newsgroups: net.dcom
Title: Re: Which modem should I choose?
Article-I.D.: sri-unix.3003
Posted: Mon Aug 30 16:01:34 1982
Received: Wed Sep  8 03:21:57 1982
References: slinac.119

	We used to have a vadic 300b autodialer, and recently
got a ventel 212+. A few points:

1) An OS hack is not really necessary for modems which dont always
	raise carrier-detect. We just moved the pin on the plug
	on the modem end of the cord from pin 8 (CD) to pin 9 (+12).
	This did the trick. Actually our vadic had a mode which
	supposedly kept CD up, but it went down for about
	1/2 second as carrier was acquired. Just long enough for unix
	to close the line. What would be best would be to have a
	short drop as carrier was lost. Anybody do this?
2) Our ventel does have dial tone detect. An ampersand ('&') in the
	number will wait for it.
3) My main complaint with the ventel is that it wont send the two
	non-numeric tones ('#' and '*'). Is there a modem that will?
	Our PBX uses these for billing.

	The ventel seems to be working pretty well now, tho the
autobauding (it determines the speed from the tty line) sometimes
screws up when machine-done and our PBX takes a long time to connect,
resulting in occasional timeouts. We have uucp mods to allow returns
and delays to be specified in L.sys, but I dont think even this is
necessary, and we're standard otherwise.
	Btw, I had to add a line to L-devices for 1200 baud, so we have
a "cul0" for 300 and a "cul1" for 1200.  These are linked to the same
file in /dev, but have different speeds in L-devices. Sending a
return, delay, return to the dialer usually does the autobaud.

Andrew