Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!cornell!uw-beaver!blake!ogccse!fosterm
From: fosterm@ogccse.ogc.edu (Mark Foster)
Newsgroups: comp.dcom.lans
Subject: Re: Ethernet Repeater Question
Message-ID: <1990@ogccse.ogc.edu>
Date: 13 Feb 89 08:14:02 GMT
References: <6162@columbia.edu>
Reply-To: fosterm@ogccse.UUCP (Mark Foster)
Distribution: na
Organization: Oregon Graduate Center, Beaverton, OR
Lines: 36

>I have a small thinwire ethernet that I would like to extend from one
>site to another.  What I was envisioning was something like:
>
>
>==============[]-------------------------------[]================
>ethernet           twisted-pair                          ethernet
>
> what I need to
>know is what type of devices the [] are...

Depends on the distance of the twisted pair (TP).  If it's greater than
about 100m, then you'll probably not make 10Mb (i.e. T1 or T3 is
prob. about the best you could do).  If it is in the 100-150m range,
you could use an ether-over-TP product (e.g. Cabletron's MMAC):

  =======[MMAC]-----------[tp BALUN xcvr]===========
  coax           TP                        thin coax

If you don't have to use TP, I'd go fiber, with a coax/fiber
repeater:
 
  ======[c/f rep.]~~~~~~~~~~~[c/f rep.]==========

If you're stuck with TP and beyond the ether over TP range, then the
solution is a fair more expensive and hard to make fast.
We use a Proteon P4200 router (which may be overkill for your
situation, but would help traffic/bandwidth limits of 56K, T1, T3
type service).  We currently run 56K over the TP link:

  ======[P4200]--------------[P4200]============

----
Mark Foster
CSE Systems Support
Oregon Graduate Center
   fosterm@cse.ogc.edu