ITU-T defines Optical Transport Network (OTN) as a set of Optical Network Elements (3R) connected by optical fibre links, able to provide functionality of transport, multiplexing, switching, management, supervision and survivability of optical channels carrying client signals. [1]
ITU Standard G.709 is commonly called Optical Transport Network (OTN) (also called digital wrapper technology or optical channel wrapper). OTN is currently offered in three rates, OTU1,OTU2 and OTU3.
- OTU1 has a line rate of approximately 2.7 Gbit/s and was designed to transport a SONET OC-48 or synchronous digital hierarchy (SDH) STM-16 signal.
- OTU2 has a line rate of approximately 10.7 Gbit/s and was designed to transport an OC-192, STM-64 or 10Gbit/s WAN. OTU2 can be overclocked (non standard) to carry signals faster than STM64/OC192 (9.953Gbit/s) like 10 gigabit Ethernet LAN PHY coming from IP/Ethernet switches and routers at full line rate (10.3 Gbit/s). This is specified in G.Sup43 and called OTU2e.
- OTU3 has line rate of approximately 43Gbit/s and was designed to transport an OC-768 or STM256 signal.[2]
- OTU4 is currently under development to transport future 100GbE signal.
See also
- ITU-T G.872: Architecture of Optical Transport Networks and Recommendation
- ITU-T G.873: Optical Transport Networks Requirements
- ITU-T SG15: Transport Networks Systems
- ITU-T G.664: General automatic power shutdown procedures for optical transport systemsITU-T
- ITU-T G.692: Optical interfaces for multichannel systems with optical amplifiers
- ITU-T G.709: Network Node Interface for the optical transport network
- ITU-T G.798: Characteristics of optical transport network equipment functional blocks
- ITU-T G.871: Framework for optical transport network recommendations
- ITU-T G.872
- ITU-T G.874: management aspect of optical transport network recommendations
- ITU-T G.875: OTN Management Information Model for the Network Element View
- ITU-T G.959.1: Optical Transport network Physical layer interfaces
References
- ^ full ITU-T OTN definitions
- ^ OTN offers transparent service delivery, Retrieved June 2, 2007
External links
1. Value of OTN for Network Convergence White paper:White Paper
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