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From: cmilono@netcom.COM (Carlo Milono)
Newsgroups: comp.dcom.lans,comp.protocols.tcp-ip
Subject: Re: 10BaseT installation
Message-ID: <1991Apr6.011139.1572@netcom.COM>
Date: 6 Apr 91 01:11:39 GMT
References: <1991Apr3.153750.19033@jhereg.osa.com> <1991Apr3.121521.5177@hellgate.utah.edu> <1991Apr4.152345.2962@jhereg.osa.com>
Organization: Netcom - Somewhere in the S.F. Bay Area
Lines: 34




First, as was stated in an earlier post or RE:, it is *not* true that
AT&T uses more than the 4 wires for 10BASE-T - four is IT for the standard
and their product is standard.  Secondly, it is a misnomer to use the RJ45
name for an 8-pin jack - the correct terminology is the ISO 8877 jack.  The
RJ stands for Registered Jack and refers to those blocks that terminate a
TelCo circuit as a demarcation point to a public service. You may note that
if you have a DSU or Modem with a private line, that the connector looks a
bit different, possibly with a switch-selectable resistor and it will have
a notch on the jack as a key for the data-set plug.

Lastly, you can run your 10BASE-T on household 'quad' wire and get an
appropriate cord (twisted preferably) to splay the four wires into the
10BASE-T standard spacing within the ISO jack.  I have several locations
where the only wire available was a six-conductor wire split between two
four-wire jacks - the first being a true RJ11.  Works fine.

I agree with a previous poster in that:
	1) the physical arrangement allows for near foolproof use of a
	   phone on the SAME jack (with a splitter)
	2) the ISO jack has proven to be sufficient to support 3270, LAN,
	   ISDN, Async, Sync, twin-axial (5251 - yuck!), as well as other
	   less-used transmission schemes (Oh, LADC-II as well!)  8 pins
	   will do most everything in a neat and clean manner, a la AT&T's
	   PDS (as opposed to IBM's multi-gauge, shielded poop).

-- 
+--------------------------------------------------------------------------+
|  Carlo Milono:  cmilono@netcom.apple.com   or   apple!netcom!cmilono     |
|"When a true genius appears in the world, you may know him by this sign,  |
|that the dunces are all in confederacy against him."   - Jonathan Swift   |
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