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> And I do see ways that the 40 Gig Phy lanes can be a 10 Gig PCS/PMD > without change. One example would be APL above 4 parallel 10GBASE-KR > PCS sublayers. Correct. This is the whole idea behind APL --- leverage the existing investment in 10Gb PHYs EXACTLY AS IS, with no changes and no need to invent anything new in the PCS/PMD sublayer. Shimon.