Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!cs.utexas.edu!uunet!n3dmc!johnl
From: johnl@n3dmc.UU.NET (John Limpert)
Newsgroups: comp.dcom.lans
Subject: Re: Why Ethernet-over-twisted-pair, anyway?
Keywords: Ethernet, twisted pair, cost-benefit
Message-ID: <843@n3dmc.UU.NET>
Date: 29 Nov 89 05:09:29 GMT
References: <4645@blake.acs.washington.edu> <693@rsiatl.UUCP>
Reply-To: johnl@n3dmc.UUCP (John Limpert)
Organization: N3DMC, Silver Spring, Maryland
Lines: 21

In article <693@rsiatl.UUCP> jgd@rsiatl.UUCP (John G. De Armond) writes:
>this answer is easy.  In most modern offices, there is usually spare telephone
>wire already installed.  This is very important in many offices, especially
>the Class A digs (read EXPENSIVE) where plenum-grade, union installed coax
>may cost $50 per foot or more.  Twisted pair is actually at an electrical 
>disadvantage but as usual, non-technical business considerations often
>override the slight technical deficiency.

The only problem is that the "spare telephone wire" is usually not
real twisted pair cable.  You end up having to pay someone to run
new cable anyway.

Is anyone besides me concerned about the RFI/EMI vulnerabilities
of twisted pair?  I see enough problems with non-existent or poor
shielding in current business/consumer electronics equipment.
Is your LAN going to collapse every time someone keys up their
radio?  Is your LAN going to blanket the area with RF garbage?

-- 
John A. Limpert			I'm the NRA!
Internet: johnl@n3dmc.UU.NET	UUCP: uunet!n3dmc!johnl