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Issues in mapping Ethernet signal to SONET

Could some one illustrate (or give pointer to existing document) on various 
in mapping an Ethernet signal
@9.584640 (+-100ppm) to OC-192 stream. As Paul has already pointed out,
the muxer, should be able to absorb 320 ppm tolerance. Basically I would like
to understand the reasoning for Length insertion in preamble (which makes the
scheme somewhat unpleasant). The basic
OAM&P function like remote fault and break link are already being talked
about as part of the control code (as part of Ethernet stream).
Thanks in advance,

Best Regards,

Devendra Tripathi
Vitesse Semiconductor Corporation
3100 De La Cruz Boulevard
Santa Clara, CA  95054
Phone: (408) 986-4380 Ext 103
Fax:	(408) 986-6050