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RE: Issues in mapping Ethernet signal to SONET

Title: RE: Issues in mapping Ethernet signal to SONET


A correction to your delineation explanation below. It should state that after the Ethernet
data stream is extracted from the SONET payload by the PMA (PCS2 in the new terminology),
the receive PCS (PCS1 in the new terminology) gains synchronization by searching for any
header (data or idle frame) with a valid HEC. It maintains synchronization by using the validated
length value to point to the next frame, which again it confirms OK by verifying that header has
a valid HEC, and so on.

I see that Paul Bottorff has clarified in a later e-mail that the <length><type><HEC> proposal
continues to be our position for the WAN PHY.


David W. Martin
Nortel Networks
+1 613 765-2901  
+1 613 763-2388 (fax)