Summary

Recommendation ITU-T G.709.1 specifies common elements and signal structures used by various types of flexible optical transport network (FlexO) interfaces.

Edition 4.0 is a major revision, with a new FlexOPy path networking layer added. The overheads have been renamed based on function instead of location in the frame structure. 1.6T Ethernet clients and associated mapping procedures have been added. Finally, new FlexO-xo rates are introduced for OTN applications.