Article View: net.lan
Article #1149Re: two different flavors of fiber optic repeaters?
From: Phil Ngai
Date: Tue, 02 Sep 1986 16:21
Date: Tue, 02 Sep 1986 16:21
31 lines
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1605 bytes
In article <2770@islenet.UUCP> bob@islenet.UUCP (Bob Cunningham) writes:
>While looking around for fiber optic Ethernet repeaters to buy, there seems
>to be two distinct flavors:
>
> plain repeaters (about $1,000 per end)
>
> slightly fancier repeaters (about $2,500 per end)
>
>The apparent difference is that for the extra cost, you get preamble
>reconstitution, fragment extension and perhaps more careful retiming.
>
>Still...some of the less expensive receivers nonetheless claim to be
>IEEE802.3 compatible.
As I read the 802.3 spec, all 802.3 compliant repeaters must offer:
1) preamble insertion (section 9.1.2.3)
2) fragment extension (section 9.1.2.5)
3) signal retiming (section 9.1.2.1.3)
as well as:
4) signal amplification (section 9.1.2.1.1)
5) signal symmetry (section 9.1.2.1.2)
I would be interested in the names of the products you have looked at.
--
Rain follows the plow.
Phil Ngai +1 408 749 5720
UUCP: {ucbvax,decwrl,ihnp4,allegra}!amdcad!phil
ARPA: amdcad!phil@decwrl.dec.com
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Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: arc1-ca.pugleaf.net!utzoo!mnetor!seismo!lll-crg!nike!ucbcad!ucbvax!amdcad!phil From: phil@amdcad.UUCP (Phil Ngai) Newsgroups: net.lan Subject: Re: two different flavors of fiber optic repeaters? Message-ID: <12896@amdcad.UUCP> Date: Tue, 2-Sep-86 12:21:16 EDT Article-I.D.: amdcad.12896 Posted: Tue Sep 2 12:21:16 1986 Date-Received: Tue, 2-Sep-86 21:19:56 EDT References: <2770@islenet.UUCP> Reply-To: phil@amdcad.UUCP (Phil Ngai) Distribution: na Organization: AMD, Sunnyvale, California Lines: 31