ITU-T Recommendations

Recommendation ITU-T G.7041/Y.1303 defines a generic framing procedure (GFP) to delineate octet-aligned, variable-length payloads from higher-level client signals for subsequent mapping into octet-synchronous paths, such as those defined in Recommendations ITU‑T G.707/Y.1322, ITU‑T G.8040/Y.1340 and ITU-T G.709/Y.1331. This Recommendation defines:

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

– the mapping procedure for the client signals into GFP;

– responses to certain defect conditions.

This edition adds the information from Amendment 1 (2012), Amendment 2 (2012) and Amendment 3 (2015) to Recommendation ITU‑T G.7041 (2011), in addition to new material and text enhancements from contributions to the February 2016 meeting.

Corrigendum 1 replaces a mistakenly expanded abbreviation with the correct terminology. It also provides some minor editorial clean-up.

Amendment 1 contains edits to enhance the clarity of the client bit numbering for the GFP-F mappings, especially the synchronization status message (SSM) bit numbering in clause 7.11. It also includes editorial corrections to labelling in four additional figures.