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Re: PMD discussion


The presentation that Walter refers to below is now up on the web site at the

   David Law

Walter Thirion <wthirion@xxxxxxxxxxxx> on 28/05/2000 18:58:00

Sent by:  Walter Thirion <wthirion@xxxxxxxxxxxx>

To:   "'802.3ae'" <stds-802-3-hssg@xxxxxxxx>
cc:    (David Law/GB/3Com)
Subject:  PMD discussion

First of all, thanks to everybody that presented PMD proposals at the last
meeting. I've sent my presentation to David Law, so it should be available
on the web site in the next couple of days.

In listening to the discussion after my presentation and then going around
and talking to people, it feels to me like we're starting to converge. Not
there, yet, but making progress.

The equipment manufacturers made it pretty clear they would like to see no
more than 3 PMDs in the standard. The PMD vendors have some concern that
using only 3 PMDs may sub-optimize certain objectives, however, they could
support the 3 PMD position if it is made clear which 3 PMDs the equipment
oems want.

Based on an informal straw poll and anecdotal evidence, my opinion is the
first choice would be the set:
850 nm WWDM
1310 nm WWDM
1550 nm Serial

If that set isn't feasible, then the 2nd most popular choice is:
850 nm WWDM
1310 nm Serial
1550 nm Serial

Thoughts, feedback?

Walter Thirion
Chair, IEEE 802.3ae PMD Sub-Task Force
301 Congress Ave.
Suite 2050
Austin, Texas 78701
Voice:    512-236-6951
Fax: 512-236-6959