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Re: [HSSG] 40G MAC Rate Discussion

Hi everyone,

I have a question regarding a possible PCS implementation
of 40GbE. To my knowledge the block code is chosen according
to the PMD configuration, i.e. a 4-lane PMD will most likely
use a different PCS than a 10l-lane PMD or a serial PMD.

For 40GbE we have been arguing that the prime candidate would
be 4x10G. Looking at 10GBase-LX4 I could imagine that the PCS
of choice is 8B/10B. This would, however, result in 12.5 Gb/s per
lane. Is that a reasonable assumption or are there any reasons that
4x10G could use the same PCS as 10x10G (e.g. 64b/66b) ?


Marcus Duelk
Bell Labs / Alcatel-Lucent
Crawford Hill HOH R-237
791 Holmdel-Keyport Road
Holmdel, NJ 07733, USA
fon +1 (732) 888-7086
fax +1 (732) 888-7074