Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!ucbvax!ulysses!smb
From: smb@ulysses.homer.nj.att.com (Steven M. Bellovin)
Newsgroups: comp.dcom.lans
Subject: Re: Ethernet Repeater Question
Message-ID: <11213@ulysses.homer.nj.att.com>
Date: 13 Feb 89 14:48:33 GMT
References: <6162@columbia.edu>
Distribution: na
Organization: AT&T Bell Laboratories, Murray Hill
Lines: 22

In article <6162@columbia.edu>, m-liu@eastend.columbia.edu (Micky Liu) writes:
> 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
> 
> Are there such things and what are their capacities.
> 
> Ideally the repeater will carry the entire bandwidth across as opposed
> to going from 10M/sec to 56K/sec...

The key question is how far you're trying to go on twisted pair.  If it's
not too far (and I don't know the limit), you can use AT&T's STARLAN 10,
or other similar products from other companies.  STARLAN 10 *is* Ethernet,
except over twisted pair instead of coax.  And repeaters are made that
go from twisted pair to coax.

*But* there is a distance limit that is almost certainly less than 500 meters,
though how much less I don't know.  And this assumes pure twisted pair;
not something going through a phone company switch somewhere.