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From: morrison@ug.cs.dal.ca (Brad Morrison)
Newsgroups: comp.sys.ibm.pc
Subject: Re: Modems and Telephone Lines
Message-ID: <1989Nov20.135228.2503@ug.cs.dal.ca>
Date: 20 Nov 89 13:52:28 GMT
References: <13410@eerie.acsu.Buffalo.EDU>
Reply-To: morrison@ug.cs.dal.ca.UUCP (Brad Morrison)
Distribution: na
Organization: Math, Stats & CS, Dalhousie University, Halifax, NS, Canada
Lines: 9

For most phone lines there are four wires.  They are really two pairs of
wires.  I believe it's Black & Red, and Green & Yellow.  Each pair is for
a separate phone line.  So, you can carry up to two separate lines from
each cable (this is for a regular modular residential jack.  I don't know
if this applies to PBX systems or not).

Hope this is of help to you. . .

Brad Morrison