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All, In regards to proposed MAC data rates, I have seen two basic
proposals Proposal A) 100 Gb/s Proposal B) Scalable Solution Proposal A supports the traditional 10x increase in speed.
Proposal B, as presently discussed, is unbounded. (The
following are only my observations of statements made on the reflector by
others) The lowest limit proposed was a 4x10 approach for 40 Gb/s. No
upper limits have been proposed. It has been suggested that this approach
should use existing PMDs, but there have been also been comments regarding use
of 10G, 25G, and 40G lambdas, but that carriers would want to leverage
their existing DWDM layer, which mean baudrate in the 9.95-12.5 Gig. Consuming
wavelengths has been brought up as a possible concern. It was also
suggested that the greatest bandwidth demands are on VSR links < 50m and
that the longer reach (>10km) may be able to live with 4x10G. (Data in
support of these observations that could be used to guide the creation of
objectives would be welcome.) An objective for Proposal A could be similar to what was
done for 10 GbE– Support a speed of 100.000 Gb/s at the MAC/PLS service interface. For Proposal B, given its current unbounded nature and
multiple discussion points, I am not sure what would be proposed. I am
looking to the advocates of this proposal to provide some verbiage to the reflector
for discussion. Using the objective above as a basis: Support a speed greater
than 10.000 Gb/s at the MAC/PLS service interface, would create too broad an objective. Also for both proposals what are people’s thoughts on an
objective that would specify an optional Media Independent Interface (MII)? John |