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From: jc@piaget.UUCP (John Cornelius)
Newsgroups: comp.dcom.lans
Subject: Re: connecting thin ethernet stations to a thick cable
Message-ID: <136@piaget.UUCP>
Date: Fri, 12-Dec-86 09:58:45 EST
Article-I.D.: piaget.136
Posted: Fri Dec 12 09:58:45 1986
Date-Received: Mon, 15-Dec-86 22:46:29 EST
References: <1097@uqcspe.OZ> <157@pta.OZ> <650@gvax.cs.cornell.edu>
Reply-To: jc@piaget.UUCP (John Cornelius, System Manager)
Organization: International Widget
Lines: 39

In article <650@gvax.cs.cornell.edu> jqj@gvax.cs.cornell.edu (J Q Johnson) writes:
 >I have a similar problem that is not solved by the proposed N-to-BNC
 >connector approach:  I have thick Ether in raceways in the hallways, with
 >arrangements for drop cables (xcver cables, that is) into individual
 >offices.  Now people want to use workstations in their offices that have
 >only thin-Ether transceivers builtin.  I gather that if I put a BNC tee
 >in my thick Ethernet the tail of the T must be quite short, so the thin-Ether
 >transceiver (built into the back of the workstation) must be located very
 >near the thick Ethernet cable -- i.e. in the hallway.
 >
 >Having workstations located in hallways near the ceiling is not appealing
 >in our environment.  Any (serious) suggestions on what to do?

There should be little or no penalty for interrupting your thick cable and
running a loop of thin cable to the workstations.  What may be most 
appealing might be to leave the thick cable as a backbone and then have a 
small number of fairly long local loops as in:

=======|    |==============|    |============|    |===
       |    |              |    |            |    |
       X    X              X    X            X    X
       |    |              |    |            |    |
       X    X              X    X            X    X
       |    |              |    |            |    |
       --X---              --X---            --X---

Where each X is a workstation.  This will require cutting the thick cable
and adding N style connectors to the new ends and then using the N to BNC
converters to initiate the thin local loops.  Earlier discussions in this 
group have indicated that RG-58 cable produces no impedance mismatch so 
you should start by doing one local loop and see how it works.

Naturally I'm assuming that your current Ethernet isn't too long to add
loops.


-- 
John Cornelius
(...!sdcsvax!piaget!jc)