Path: utzoo!utgpu!jarvis.csri.toronto.edu!cs.utexas.edu!samsung!zaphod.mps.ohio-state.edu!mips!ultra!shj
From: shj@ultra.com (Steve Jay)
Newsgroups: comp.dcom.lans
Subject: Re: FDDI over copper
Message-ID: <1990Mar6.193256.1068@ultra.com>
Date: 6 Mar 90 19:32:56 GMT
References: <1990Feb28.105322.4274@hellgate.utah.edu> <549@sword.bellcore.com>
Organization: Ultra Network Technologies
Lines: 25

cyc2@sword.bellcore.com (Chung Yu Chen) writes:

>125 Mega baud over a pair of copper? I think you meant wave guide. Cheaper?
>guess again.


My company, Ultra Network Technologies, builds very high speed networking
products.  We can use either coax or fibre to connect our hubs together.
Using good quality 75 ohm coax cable (RG-11), we can go 230 meters at
250 Mbits/sec, 330 meters at 125 Mbits/sec, or 460 meters at 62.5 Mbits/sec.
Cut the distances in half for cheaper (RG-59) cable.  We use two cables
for full duplex operation.  This is real stuff....we have machines
scattered all over our building connected to our UltraNet via coax
cable using our 125 Mbits/sec serial links.

So, using relatively cheap copper for FDDI data rates over limited
distances (~1000 feet) would seem quite feasible.

Steve Jay
shj@ultra.com  ...ames!ultra!shj
Ultra Network Technologies / 101 Dagget Drive / San Jose, CA 95134 / USA
(408) 922-0100 x130	"Home of the 1 Gigabit/Second network"

P.S. The above is not intended to be an advertisement (honest), just a
confirmation that very fast serial data over copper is possible.