For 10 GbE LAN PHY services, an overclocked ODU2e with 10.40 Gb/s has been defined. They address different bit rates and mapping schemes. Eight ODU signals have been defined in G.709. The ODU signals are the end-to-end networking entities. They are structured in hierarchical levels called Optical Channel Payload Unit (OPU), Optical Channel Data Unit (ODU) and Optical Channel Transport Unit (OTU). The TDM part is hierarchically structured, with Optical Channels (OCh) forming its basis. It combines TDM and WDM into a common transport system. It is sometimes also called Optical Transport Hierarchy (OTH). The Optical Transport Network (OTN) is specified in several ITU-T Recommendations (G.872 on architecture ( ITU-T, 2017), G.709 on frames and formats ( ITU-T, 2009a), G.798 on atomic functions and processes ( ITU-T, 2012a)). Klaus Grobe, in Encyclopedia of Modern Optics (Second Edition), 2018 Overview on the Optical Transport Network OTN Layers
0 Comments
Leave a Reply. |