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Question on XSBI

I have been reading through clause 53 and it triggered a question on XSBI.

Are the 16 data bits of the XSBI interface in any way aligned with the byte 
boundaries of the SONET frame ? I don't believe that any alignment is 
specified in the OIF SFI-4 spec.  If this is the case does it mean that the 
LW4-PMA has the ability to locate the SONET A1/A2 frame boundary on any one 
of 16 possible bit alignments within the XSBI interface ?

Gary .....