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664b/66b frame alignment in SONET payload


Hi,

I have a question regarding alignment of the PCS 66-bit frames
within the SONET payload (in WAN mode obviously).  My understanding
is that the PCS 66-bit frames can and will cross SONET frames, and
obviously they will not begin on octet boundaries.  However, will
it be specified that the PCS frames will sit on even-bit boundaries,
reducing the valid sync locations from 66 to 33?

Erik