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Agreed, the EoS (e.g. GFP-F) mapping is a simple port-to-port mapping and doesn't include the full MAC sublayer processing (i.e. only terminates IPG, preamble, SFD). Inspecting the MAC DA and filtering off EFM OAMPDUs and processing them is required by the network application, since the Ethernet link / PHY to which they apply is terminated. OAM for link 1 cannot be mixed with OAM for link 2 on the other side of the provider's network.
ONU1 -------------- OLT1/GFP------------------ GFP/OLT2 ------------ ONU2
Ethernet SONET Ethernet
It might be more appropriate to continue this privately, or on the Q.12/15 reflector.
David W. Martin
I like to agree with you, but from layering architectural point of view, the EOS box does not have to implement MAC
layer (i.e., do any MAC lookup), rather a P-2-P EOS is a kind of port transport in which all traffic coming form an Ethernet port are send over a specific SONET channel.
Please see further comments in-line: