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- Path: sparky!uunet!elroy.jpl.nasa.gov!usc!isi.edu!finn
- From: finn@isi.edu (Greg Finn)
- Newsgroups: comp.dcom.cell-relay
- Subject: Re: LAN link cost issues
- Message-ID: <23103@venera.isi.edu>
- Date: 21 Dec 92 19:44:19 GMT
- Sender: news@isi.edu
- Reply-To: finn@dalek.isi.edu (Greg Finn)
- Organization: USC-Information Sciences Institute
- Lines: 25
-
- In article <ts3p258@rhyolite.wpd.sgi.com> vjs@rhyolite.wpd.sgi.com (Vernon Schryver) writes:
-
- >You have an unusual office tower.
- >100 meters is, as Rob says, short in many, and probably most situations.
-
- Although it has been some years ago, I have designed and
- supervised installation of data wiring during building construction.
- 30 meter point-to-point span is a bit short for some office runs, but
- not most runs unless a building has poorly sited wiring closets.
-
- If 30 meter copper gigabit cable runs save several hundreds of
- dollars per interface over fiber, they will be used just as FDDI has
- mutated away from fiber. Video cable runs of up to 50 meters are
- standardized to carry 400 Mb/s Fibre Channel (FC-PH Rev 2.2). That is
- the competition.
-
- Gigabit class fiber optics interfaces may get cheap enough to
- eliminate most of the price advantage that copper media now has for
- use in LANs. My principal interest is getting gigabit service to users
- cheaply. For now, copper looks like the right approach when I cost
- out parts. It is many times less expensive. When fiber gets cheap
- enough, I would choose fiber.
- --
- Gregory Finn (310) 822-1511
- Information Sciences Institute, Marina Del Rey, CA 90292
-