Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!zaphod.mps.ohio-state.edu!samsung!uunet!jhereg!andrew
From: andrew@jhereg.osa.com (Andrew C. Esh)
Newsgroups: comp.dcom.lans
Subject: Re: 10BaseT wiring question #4936
Message-ID: <1991Apr26.203628.3479@jhereg.osa.com>
Date: 26 Apr 91 20:36:28 GMT
References: <35817@sequoia.UUCP>
Organization: Open Systems Architects, Inc., Mpls, MN
Lines: 41

In article <35817@sequoia.UUCP> keith@sequoia.UUCP (Keith Pyle) writes:
>Disclaimer: this just became an issue here, so if this question has been
>answered already, my apologies.
>
>Is it possible (and/or practical) to have more than one device (workstation,
>PC, etc.) per port using 10BaseT?  We have a number of developers with two
>and sometimes three systems connected to the thinnet in their offices.  We
>are considering relocation and 10BaseT has some desirable qualities, plus
>lower cost than thinnet.  However, if we can't have multiple devices per
>10BaseT port, it won't likely be practical for us.  Providing multiple ports
>per office isn't likely to be accepted.
>
>Thanks.
>-- 
>-----------------------------------------------------------------------------
>Keith Pyle                                UUCP: ...!cs.utexas.edu!execu!keith
>Comshare, Inc., Austin, Texas             Internet: keith@execu.com
>"It's 10 o'clock.  Do you know where      Disclaimer: Everything I say is
>   your child processes are?"               true unless I use the word 'the'.
>-----------------------------------------------------------------------------

It sounds like you want to put all these three computer Thin segments on a
port each, and tie them all together with a 10baseT hub.

No problem. Leave the Thin segments set up the way they are, and add an AUI
to ThinNet transceiver to the segment. We have a Cabletron ST-500, but a
Allied Telesis CentreCom MX-10 works just as well. On the AUI side, put a
ODS 264 Twisted Pair Tranceiver. It is powered by a small AC power supply,
so you don't have to worry about where the power is going to come from. The
other end of the 264 is Twisted Pair, which goes into your hub. All three
machines on the Thin segment look like they are on the same port, from the
hub's point of view. We run it, and it works just fine, except that if you
screw around with the ThinNet, like take off one of the terminators or
short it or something, the 264 locks up and has to be powered off-on to get
it to talk to the ST-500 again. Have fun.

-- 
Andrew C. Esh			andrew@osa.com
Open Systems Architects, Inc.
Mpls, MN 55416-1528		Punch down, turn around, do a little crimpin'
(612) 525-0000			Punch down, turn around, plug it in and go ...