Optical Transport Network

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ITU-T defines Optical Transport Network (OTN) as a composed of 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) or digital wrapper technology. 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).
  • OTU3 has line rate of approximately 43Gbit/s and was designed to transport an OC-768 or STM256 signal.[2]

[edit] 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.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

[edit] References

  1. ^ full ITU-T OTN definitions
  2. ^ OTN offers transparent service delivery, Retrieved June 2, 2007
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[edit] External Links

1. Value of OTN for Network Convergence White paper:White Paper

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