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Posting-Version: version B 2.10.3 alpha 5/22/85; site cbosgd.UUCP
Path: utzoo!linus!gatech!cbosgd!mark
From: mark@cbosgd.UUCP (Mark Horton)
Newsgroups: net.dcom
Subject: Re: 2-line phone and modem problems
Message-ID: <1378@cbosgd.UUCP>
Date: Thu, 8-Aug-85 19:01:01 EDT
Article-I.D.: cbosgd.1378
Posted: Thu Aug  8 19:01:01 1985
Date-Received: Sun, 11-Aug-85 06:25:38 EDT
References: <427@ucdavis.UUCP>
Organization: AT&T Bell Laboratories, Columbus, Oh
Lines: 30

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.

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.

Of course, it goes without saying that if you pick up the phone on
your modem line while you have a data call in progress, it will
put noise on the line.

	Mark