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From: les@chinet.chi.il.us (Leslie Mikesell)
Newsgroups: comp.dcom.lans
Subject: Re: 10BaseT vs. Twisted Pair?
Message-ID: <1991Apr22.150921.4350@chinet.chi.il.us>
Date: 22 Apr 91 15:09:21 GMT
References: <1991Apr8.135731.2901@eng.umd.edu> <1991Apr16.175210.5468@netcom.COM>
Organization: Chinet - Chicago Public Access UNIX
Lines: 19

In article <1991Apr16.175210.5468@netcom.COM> jbreeden@netcom.COM (John Breeden) writes:
>BTW, the two pairs
>defined in the standard (pair 1&2 and pair 3&6) are defined as data
>pairs in the AT&T Premise Distribution Spec (what 10baseT's wiring is
>based on and also where the RJ45 comes from). The remaining two pairs
>are for phone or ISDN (both ISDN and PBXs use 4,5,7,8 as the two voice pairs).

Is there a quickref for this scheme available somewhere?  Is there a
standard part to split the data and voice parts out of a wall-jack
RJ45 into a separate phone RJ45 and 10baseT RJ45 or do you have to
hand-wire something to do this?  What about the phones that draw
power from the System 75?

I'm considering replacing some daisy-chained 1M starlan runs with 10baseT
and it would be a big win if we don't have to add any wiring for the
extra hub-to-desktop runs.

Les Mikesell
  les@chinet.chi.il.us