Path: utzoo!censor!geac!torsqnt!jarvis.csri.toronto.edu!clyde.concordia.ca!uunet!tut.cis.ohio-state.edu!cs.utexas.edu!rice!uw-beaver!ssc-vax!bcsaic!carroll
From: carroll@bcsaic.UUCP (Jeff Carroll)
Newsgroups: comp.dcom.lans
Subject: Re: FDDI over copper
Message-ID: <21184@bcsaic.UUCP>
Date: 5 Mar 90 00:02:35 GMT
References: <1990Feb28.105322.4274@hellgate.utah.edu> <549@sword.bellcore.com> <1990Mar3.224014.26968@hellgate.utah.edu>
Reply-To: carroll@bcsaic.UUCP (Jeff Carroll)
Organization: Boeing Computer Services AI Center, Seattle
Lines: 15

In article <1990Mar3.224014.26968@hellgate.utah.edu> haas@cs.utah.edu (Walt Haas) writes:
>In article <549@sword.bellcore.com> cyc2@sword.bellcore.com.UUCP (Jason Chen) writes:
>>125 Mega baud over a pair of copper? I think you meant wave guide. Cheaper?
>>guess again.
>Our broadband runs TV out to 450 MHz on RG6.  That's a lot cheapr than fiber.

	Yup. Cutoff of the second mode (forget which one it is) in RG58
is something like 10 GHz.
	Twisted pair doesn't sound practical to me, though I haven't
done the calculations. Anybody care to present numbers on single-mode BW
and group delay.
	Related question: how does FDDI compare, cost-wise, to HPPI?

	Jeff Carroll
	carroll@atc.boeing.com