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From: juliet@mhuxo.att.com (Juliet Sutherland)
Newsgroups: comp.dcom.telecom
Subject: Re: Two Questions From a Novice
Message-ID: <telecom11.129.8@eecs.nwu.edu>
Date: 18 Feb 91 20:49:08 GMT
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X-Telecom-Digest: Volume 11, Issue 129, Message 8 of 12
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In article <telecom11.123.8@eecs.nwu.edu>, Jim.Redelfs@iugate.
unomaha.edu (Jim Redelfs) writes:

> As existing, copper-pair  cable facilities  reach their capacity,  the
> solution  is  to  either place  more   cable,   or install "Pair Gain"
> systems.   One used  in my   specific  service area  is called   SLC96
> (Slick-96) where, through the use of special equipment on BOTH ends of
> the cable, 96 "pairs" are achieved on the end by  using FOUR, physical
> pairs of wire.

One minor quibble with the above.  The SLC(R)-96 and SLC Series 5
carrier systems actually use 10 physical pairs.  Each 96 line system
uses four primary T1 lines and one protection T1 line (assuming it is
supported by copper feeder rather than a co-located fiber mux).  Each
T1 line uses two pairs (one each for transmit and receive) for a total
of 10 physical pairs.  There may also be additional pairs associated
with multiple systems for such things as test access, order wire, etc.
The pair gain is still substantial, however.

SLC is a registered trademark of AT&T Network Systems.


Juliet Sutherland       Digital Loop Carrier Systems
AT&T Bell Laboratories  juliet@mhuxo.att.com