EXFO FTB-8510B Guia Del Usuario página 1302

Glossary
Next-Gen - Generic Framing Procedure (GFP)
The GFP generic frame structure is presented in figure below.
Each GFP frame type consists of three main components: the core header,
the payload header, and the payload information field.
The core and payload headers form the GFP header, whereas the payload
information field represents the customer traffic carrying the data services.
The payload header carries information about the payload type (i.e.,
Ethernet, Fibre Channel, etc.) that it is carrying, while the core header
carries information about the size of the GFP frame itself.
Each header contains a header error correction (HEC) calculation,
allowing for the correction of single errors; that is, any errors that occur in
the core header or in the payload header can potentially be corrected by
the HEC, through the network element. This creates a very robust mapping
scheme, which ensures that GFP frames can get transported across a
network without customer traffic loss.
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GFP Generic Frame Structure
FTB-8100 Series Transport Blazer