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Re: [HSSG] Backwards compatibility

Title: Backwards compatibility
Good question.  Unlike copper PHYs that use Clause 28 auto-negotiation to determine the capabilities of each PHY and to use the highest common denominator, nothing to-date exists in 802.3 for the optical PHYs to do the same.  Depending on the approach taken by the task force (once formed), this may be a viable option to consider.  For example, an n x 10G solution could use a base channel to communicate the capabilities of each end of the link.

From: Kevern, James D [mailto:james.kevern@xxxxxxxxxxxxxxxxxxx]
Sent: Tuesday, August 22, 2006 11:25 AM
To: STDS-802-3-HSSG@xxxxxxxxxxxxxxxxx
Subject: [HSSG] Backwards compatibility

Excuse me for not knowing 1 & 10 Gig well enough, but is it reasonable to consider backwards compatibility with the corresponding implementations (i.e. short and long wavelength)?  Or is backwards compatibility a given?