Summary

Amendment 2 to Recommendation ITU-T G.709/Y.1331 (2012) contains extensions related to the:

–           addition of a low latency 1.25G OTU0 for deployment at the edge of an optical transport network (clauses 2, 3.2, 4, 11.1 and Annex G),

–           addition of overhead (OH) type, trail trace identifier (TTI) and nominal central frequency overhead and transport of this overhead plus OCh FDI-P, FDI-O and OCI overhead over a multi-vendor IaDI (clauses 15.5.4, 15.5.4.1 and 15.5.4.2).