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ITU-T Recommendation G.709 (Interface for the optical transport network (OTN)) is a standardized method for managing optical wavelengths in optical network. G.709 allows the use of alloptical switches (Optical cross-connect) without doing the expensive optical/electrical/optical {O/E/O} conversions. The ITU Telecommunication Standardization Sector (ITU-T) coordinates standards for telecommunications on behalf of the International Telecommunication Union (ITU) and is based in Geneva, Switzerland. ... Synchronous optical networking, is a method for communicating digital information using lasers or light-emitting diodes (LEDs) over optical fiber. ...
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