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- Path: sparky!uunet!zaphod.mps.ohio-state.edu!sol.ctr.columbia.edu!ira.uka.de!uka!telematik.informatik.uni-karlsruhe.de!stiller
- From: stiller@telematik.informatik.uni-karlsruhe.de
- Newsgroups: comp.protocols.iso
- Subject: Re: Token Ring and FDDI on same ring?
- Date: 23 Jul 92 16:45:38 +0100
- Organization: Institut fuer Telematik, Universitaet Karlsruhe
- Lines: 30
- Message-ID: <1992Jul23.164538.1@telematik.informatik.uni-karlsruhe.de>
- References: <Brr3vF.4p0@world.std.com>
- NNTP-Posting-Host: t8600.telematik.informatik.uni-karlsruhe.de
-
- In article <Brr3vF.4p0@world.std.com>, nectar@world.std.com (Jacques A Vidrine)
- writes:
- > Simple question, but I don't expect a simple answer.
- >
- > Can FDDI and Token Ring be run on the same ring?
- >
- > My organization has in place a 16Mbps Token Ring network using the
- > IBM Cabling System with optical fiber. It is our goal to move to
- > FDDI in the future. Thus the question.
- >
-
- I think that this is absolutely not possible, since more than just technological
- problems arise (layering, mechanisms, etc.). Both concepts are often named
- token ring, but the "Token Ring" is a single token mechanism and "FDDI" uses
- the concept of a multiple token. The MAC layers differ for that reason in
- almost every single item. The coding schemas are totally different (Manchester
- vs. 4b/5b). FDDI uses a bunch of timers, which the "Token Ring" never heard of!
-
- It may be possible to use the same fiber optics as media, but I am not familiar
- with them in detail.
-
- Regards, B.Stiller
- --
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