ITU-T - International Telecommunication Union/ITU Telcommunication Sector
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ITU-T G.987.3-2014
Scope
This Recommendation describes the transmission convergence layer for 10-Gigabit-capable passive optical network (XG-PON) systems ?C a family of flexible access network systems that operate over a point-to-multipoint optical access infrastructure at the nominal data rate of 10.0 Gbit/s in at least the downstream direction@ while providing a wide range of broadband and narrow-band services to end-users. This Recommendation specifies: ?C the layered structure of the XG-PON transmission convergence (XGTC) layer; ?C functionality of the service adaptation sublayer@ including XG-PON encapsulation method (XGEM)@ XGEM frame delineation@ and service data unit (SDU) fragmentation; ?C functionality of the framing sublayer with the specification of the downstream XG-PON frame and upstream burst formats; ?C functionality of the physical interface (PHY) adaptation sublayer@ including forward error correction and scrambling; ?C XG-PON embedded management functionality@ including upstream time-division multiple access and dynamic bandwidth assignment mechanisms; ?C the XG-PON physical layer operation@ administration and management (OAM) messaging channel; ?C the optical network unit (ONU) activation method; ?C timing aspects of point-to-multipoint operation and time-of-day communication; ?C cryptographic mechanisms for authentication@ integrity verification@ channel isolation and data protection along with and the associated key exchange protocols; ?C signalling mechanisms and protocols to support ONU power saving. This Recommendation forms an integral part of the ITU-T G.987 series of ITU-T Recommendations [ITU-T G.987]@ [ITU-T G.987.1]@ [ITU-T G.987.2] that@ together with [ITU-T G.988]@ specify a single coherent set of access transmission systems.