Path: utzoo!utgpu!jarvis.csri.toronto.edu!cs.utexas.edu!tut.cis.ohio-state.edu!rutgers!bellcore!pyuxp!towernet!gamma!sword!cyc2
From: cyc2@sword.bellcore.com (Chung Yu Chen)
Newsgroups: comp.dcom.lans
Subject: Re: FDDI over copper
Message-ID: <557@sword.bellcore.com>
Date: 5 Mar 90 22:09:33 GMT
References: <1990Feb28.105322.4274@hellgate.utah.edu> <549@sword.bellcore.com> <1990Mar3.224014.26968@hellgate.utah.edu>
Reply-To: cyc2@sword.bellcore.com.UUCP (Jason Chen)
Organization: Bellcore, Red Bank NJ
Lines: 18

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.
                   ^^^^     ^^^^^^^^^^^
>
>-- Walt Haas

We are not talking on the same basis. Yours is an analog 450 MHz, 
simplex signal in the lab,  while I was talking about 125 Mbaud, 
full duplex, digitally coded signals over a stretched distance. 
If you caculate the required analog bandwidth for FDDI digital 
signals with the necessary distance and error rate requirements,
you may find that 450 MHZ is only a very small fraction.

-- Jason Chen