ITU-T G.872 PDF

This Recommendation describes the functional architecture of optical transport networks (OTNs) using the modelling methodology described in [ITU-T G.800] and [ITU-T G.805] for the digital layer networks, and [ITU-T G.807] for the optical media network. OTN functionality is described from a network-level viewpoint. This takes into account the characteristic information (CI) of OTN clients, the client/server layer associations, network topology, the optical media network structure and the layer network functionalities that provide multiplexing, routing, supervision, performance assessment and network survivability for digital clients. The digital layers of the OTN use the frame formats specified in [ITU-T G.709]. The media portion of the network is described in terms of media constructs, media elements and optical signal maintenance entities described in [ITU-T G.807]. This Recommendation provides the functional description of OTN that support digital clients. The support of analogue signals as clients lies outside the scope of this Recommendation.