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From: floyd@hayes.ims.alaska.edu (Floyd Davidson)
Newsgroups: comp.dcom.modems
Subject: Re: Noisy phone lines
Message-ID: <1990Nov19.120953.27117@hayes.ims.alaska.edu>
Date: 19 Nov 90 12:09:53 GMT
References: <1990Nov15.193826.3875@beach.csulb.edu> <2983@hayes.uucp>
Organization: University of Alaska Fairbanks
Lines: 44

In article <2983@hayes.uucp> tnixon@hayes.uucp (Toby Nixon) writes:
>In article <1990Nov15.193826.3875@beach.csulb.edu>,
>sichermn@beach.csulb.edu (Jeff Sicherman) writes: 
>
>>  Due to complaints from roommates, I will finally be activating a
>> second phone line to use my modem on. However, I will be using the
>> existing 4-wire lines already built-in to the place, not able to add
>> twisted-pair as is often recommended to avoid cross-talk with the
>> voice line. Is there anything else I can do - some kind of external
>> at the connector or something - to minimze this.
>> [...]
>
>I've used modems on second lines connected through the yellow/black 
>pair in a residence (actually, several different residences) and 
>never had a problem.  
>
>Remember -- as soon as that phone cable leaves your house, it 
>immediately goes into a big fat cable with literally hundreds or 
>thousands of other pairs of copper wire.  If "crosstalk" was going 
>to be a problem, you'd have already run into it!!
>

Jeff you won't have any trouble at all *if* your current 4-wire
drop wire is the usual j-k drop line that Toby is refering to
above (with a red/green pair and a yellow/black pair).  Each of
those is a twisted pair.  If you have a 6-wire drop line it may 
also have a blue/white pair that can be used also.

If by some chance you have house wiring that is not twisted pairs
on those lines, then you will have trouble.  How much depends
on how ling the lines are (how much is not twisted pair).  It
will probably not cause your modem any trouble at all, but the
voice conversation on the other line may notice your modem.

Just try it and see what happens.  If things don't go right,
which is unlikely, post something here giving as much detail
as possible about the physical setup.

Floyd

-- 
Floyd L. Davidson   floyd@hayes.ims.alaska.edu    floydd@chinet.chi.il.us
Salcha, AK 99714    connected by paycheck to Alascom, Inc.
When *I* speak for them, one of us will be *out* of business in a hurry.