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Optical Transport Network (OTN)

Posted by:safaipao Posted on:Dec 19,2016

ITU-T defines an Optical Transport Network (OTN) as a set of Optical Network Elements (ONE) connected by optical fiber links, able to provide functionality of transport, multiplexing, switching, management, supervision and survivability of optical channels carrying client signals. An ONE may Re-time, Re-Amplify, Re-shape (3R) but it does not have to be 3R – it can be purely photonic.

The ITU’s Optical Transport Network (OTN), as defined by recommendation G.709, provides a network-wide framework that adds SONET/SDH-like features to WDM equipment (also known as Wavelength Switched Optical Network equipment, or WSON equipment). It creates a transparent, hierarchical network designed for use on both WDM/WSON devices and TDM devices. Two switching layers are formed (TDM and WSON) and functions of transport, multiplexing, routing, management, supervision, and survivability are defined.

The promise of the Optical Transport Network (OTN) is designed to address these issues by delivering a transparent framework to efficiently carry diverse traffic types. Defined by recommendation G.709, the OTN creates a transparent, hierarchical network designed for use on both WDM/WSON and TDM devices. Two switching layers are formed (TDM and WSON) and functions of transport, multiplexing, routing, management, supervision, and survivability are defined.


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