1. Optical Transport

2. Optical Transport Network - Standards
ITU-T Recommendation G.709 is commonly called Optical Transport Network (OTN) (also called digital wrapper technology or optical channel wrapper). As of December 2009 OTN has standardized the following line rates.

3. Optical Transport Network
ITU Telecommunication Standardization Sector|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.[ ITU-T OTN definitions] An ONE may Re-time, Re-Amplify, Re-shape (Wavelength-division multiplexing#Wavelength converting transponders|3R) but it does not have to be 3R— it can be purely photonic.

4. Communications network - Optical Transport Network (OTN)
Optical Transport Network (OTN) is a large complex network of server hubs at different locations on ground, connected by Optical fiber cable or optical network carrier, to transport data across different nodes

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