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RE: Question on Fiber for 10Gig

I think there may be some confusion between the minimum goals for a
particular PMD and what will be supported in the standard.  Judging from
presentations made to the 802.3ae committee, the intent is to support
various types of mm fiber to various distances. The difficulty is to be
clear as a bell to the user.  I believe the 1300nm WWDM PMD will work to 300
m over 500 MHz*km mm fiber regardless of choice between the two core sizes.

Robert A. Marsland
New Focus, Inc.
Focused Research
8383 Greenway Blvd.
Middleton, WI 53562
(608) 824-6000 x202
(608) 827-9033 FAX

-----Original Message-----
From:	owner-stds-802-3-hssg@xxxxxxxx [mailto:owner-stds-802-3-hssg@xxxxxxxx]
On Behalf Of Chris.Kozup@xxxxxxxxxxxxx
Sent:	Monday, November 13, 2000 4:49 PM
To:	stds-802-3-hssg@xxxxxxxx
Subject:	Question on Fiber for 10Gig


I am looking at a white paper on 10Gigabit Ethernet which is
published on the 10GEA website.  Within this document it lists
the plans for Multimode and Singlemode support of 10Gig.

According to this document, 50 micron Multimode Fiber will only
be specified to run up to 65 meters using an 850nm PMD.  Whereas
a 62.5 micron Multimode Fiber will support 10Gig up to 300 meters
using a 1310nm PMD.

Does anyone know why this decision was made as such ?  More
specifically, my understanding was that a 50micron fiber was of
better quality compared with a 62.5 micron.  Why not include a 50
micron standard for a 1310nm PMD ?

any comments appreciated.


Chris Kozup


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