Date: Thu, 2 Oct 1997 19:54:02 +0100 (MET) From: Wilko Bulte <wilko@yedi.iaf.nl> To: totii@est.is (=?iso-8859-1?Q?=DEor=F0ur?= Ivarsson) Cc: chuckr@Glue.umd.edu, FreeBSD-Hackers@FreeBSD.ORG Subject: Re: thickwisre<->thinwire Message-ID: <199710021854.TAA00977@yedi.iaf.nl> In-Reply-To: <3433C896.41C67EA6@est.is> from "=?iso-8859-1?Q?=DEor=F0ur?= Ivarsson" at Oct 2, 97 04:19:40 pm
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As =?iso-8859-1?Q?=DEor=F0ur?= Ivarsson wrote... > Wilko Bulte wrote: > > > > As Chuck Robey wrote... > > > I'm doing a bit of computer re-arrangement (keeps my life interesting) and > > > I find I have to connect another computer to my existing home ethernet. > > > Trouble is, the ethernet is thinwire, and the new computer (a DECStation > > > 5000/120, which will be running NetBSD) is thickwire. I'm going to be > > > connecting it to my two existing FreeBSD boxes. > > > > It probably has an AUI 15 pin D connector. Just find a thinwire tranceiver, > > they are quite abundant. Or if you have an AUI-10base5 tranceiver, rewire > > it to use a BNC connector. The electronics are the same for 10base2 and > > 10base5 (at least they are not distinguishable in normal use) > > > The specs changes only little and does not care for short cables. > The main difference is the velocity factor of Thick Wire is lot higer > than > Thin Wire cable. The electronic is the same. Not completely. The collision detect uses a diode connection to the central conductor on the thinwire tranceiver, and is directly connected for thickwire (or the other way around, I forgot that detail). This is at least the difference in the NS8392 based implementation I used when I built a couple of tranceivers myself (years ago, when they were rare and $ were few ;-) Wilko _ ____________________________________________________________________ | / o / / _ Bulte email: wilko@yedi.iaf.nl http://www.tcja.nl/~wilko |/|/ / / /( (_) Arnhem, The Netherlands - Do, or do not. There is no 'try' ----------------------------------------------------------------------Yoda
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