Summary

Amendment 4 to Recommendation ITU-T G.709/Y.1331 (2012) contains extensions related to the:

−           addition of the OTSn OTN synchronization messaging channel (OSMC) overhead;

−           addition of the OTUk OTN synchronization messaging channel (OSMC) overhead;

−           modification of the OCh overhead transport over OTM-1 multi-vendor IaDI specification to align with the specifications in Recommendation ITU-T G.7712;

−           addition of optional FEC processing in the FC-1600 client signal.