scope:

This Recommendation specifies a set of flexible-bandwidth interoperable short-reach optical transport network (OTN) interfaces, the so called FlexO-x-RS-m interface group, over which an aggregate OTUCn (n ≥ 1) can be transferred using bonded FlexO short-reach interfaces as lower bandwidth elements.

The types of FlexO short-reach interfaces that can serve as FlexO-x-RS-m group members are covered by application codes which are at the time of publication 4I1-9D1F, 4L1-9C1F, C4S1-9D1F, 4L1-9D1F, C4S1-4D1F, 8R1-4D1F, 4I1-4D1F and 8I1-4D1F. These application codes are presented in [ITU-T G.695] and [ITU-T G.959.1].

The definition of a FlexO-x-RS-m interface group complements the existing functions specified in [ITU-T G.709], such as OTUCn frame, ODUk/flex, with new functions such as physical interface bonding, forward error correction (FEC) coding, group management, OTUCn (de)mapping.

This FlexO-x-RS Recommendation complements [ITU-T G.709] and [ITU-T G.798] and provides specifications for new functions that are specific to the processing of FlexO-x-RS-m interface group. In addition, some introduction material for the addressed application is included.

This Recommendation also contains common elements and definitions that may be used by interfaces that are outside the scope of this short reach interface Recommendation. Such definitions include FlexO frame definitions, FlexO-x interleaving, Ethernet optimized mapping procedures and frame alignment methods.