scope:

This Recommendation defines a generic framing procedure (GFP) to encapsulate variable length payload of various client signals for subsequent transport over SDH, PDH, and OTN networks as defined in ITU-T Recs G.707/Y.1322, G.8040/Y.1340, and G.709/Y.1331. The Recommendation definitions include the:

- frame formats for protocol data units (PDUs) transferred between GFP initiation and termination points;

- mapping procedure for the client signals into GFP.

The framing procedure described in this Recommendation can be applied to both the encapsulation of entire client frames (frame mapped GFP), in which a single client frame is mapped into a single GFP frame, and to character mapped transport (transparent GFP) in which a number of client data characters are mapped into efficient block codes for transport within a GFP frame.