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From: BILLW%sri-kl@sri-unix.UUCP
Newsgroups: net.micro
Subject: Re:  Some modems dont work on some lines
Message-ID: <3616@sri-arpa.UUCP>
Date: Fri, 29-Jul-83 16:23:00 EDT
Article-I.D.: sri-arpa.3616
Posted: Fri Jul 29 16:23:00 1983
Date-Received: Mon, 1-Aug-83 11:33:15 EDT
Lines: 7

Also, when you have a second line installed many places, they just
use the  "unused" yellow and black wires for the second line.  The
normal phone signals present on the remaining two wire are definately
capable of preventing a modem from working properly, as I have determined
on two seperate occasions with Vadic triple modems...

BillW