Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10.2 9/18/84; site ulysses.UUCP Path: utzoo!linus!gatech!ulysses!smb From: smb@ulysses.UUCP (Steven Bellovin) Newsgroups: net.dcom Subject: Re: 2-line phone and modem problems Message-ID: <1038@ulysses.UUCP> Date: Sat, 10-Aug-85 14:11:23 EDT Article-I.D.: ulysses.1038 Posted: Sat Aug 10 14:11:23 1985 Date-Received: Mon, 12-Aug-85 06:21:43 EDT References: <427@ucdavis.UUCP> <1378@cbosgd.UUCP> Organization: AT&T Bell Laboratories, Murray Hill Lines: 31 > In article <427@ucdavis.UUCP> ccohesh@ucdavis.UUCP (Hesh) writes: > >my roomate recently bought a special 2-line phone; it > >seems to be causing problems with my modem. when this > >phone is hooked up, i receive voluminous amounts of your > >standard modem type garbage ("{i", "|}", etc.). > > You didn't say what kind of modem or what kind of phone. > However, a 2 line phone ought to be just a switch and a phone; > if you don't have your phone picked up on the modem line it > shouldn't do anything to your line. For most phones, when they are on-hook, there's ring-detector cirucitry active. Depending on the design of the phone -- I doubt that the problem is because the new phone is 2-line. > You might try making sure only the modem line pair gets to the > modem. I've installed modems through RJ-11 jacks and found that > the second (supposedly unused) pair gets an incredible hum put > onto it by the modem. That is, I have a voice line and a data > line and RJ14 jacks (e.g. regular modular jacks where the other > line gets put onto the two extra pins.) Some wall jacks have > the voice line in the primary slot, some the modem line. I plug > the modem into a modem jack and suddenly there's a big hum on the > voice line. Never could figure out why. I think this has happened > with several different modems. The fix is to get one of these plugs > with 3 outputs - line 1, line 2, and both, and plug your modem into > a "line 1" jack, which disconnects the line 2 leads. Or do a little > wiring to get the same effect. Many modems provide A-A1 signalling on the other two lines, for use with office key systems.