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1.GTC overview

GTC (G-PON Transmission Convergence) layer between physical media and G-PON clients

2.C/M planes

Control and management planes

• Embedded OAM

A low latency path for time urgent control information, because each information piece is definitely mapped into specific field in the header of the GTC frame

• PLOAM (Physical Layer OAM)

A message-formatted system carried in a dedicated space of the GTC frame

• OMCI (ONU Management and Control Interface)

Manage the service defining layers that lay above the GTC

The GTC must provide a transport interface for the traffic in ATM or GEM

3.U plane

• Traffic flows in the U plane are identified by their traffic type (ATM or GEM)
• The traffic type is implicitly indicated by which downstream partition or upstream allocation ID carries the data

4.GPON Downstream Frame Format

5.GPON Upstream Frame Format

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