Sonet was developed by the American Bell Laboratories and is based on single-stage multiplexing. It is a synchronous transmission method for wide area networks, from which the ITU standard for the Synchronous Digital Hierarchy (SDH) emerged in 1988. Sonet describes the transmission frame of OSI layer 1 and is used as a transport medium for ATM. In Sonet, transmission rates, coding schemes and bit rate hierarchies are standardized.frame is called Synchronous Transport Signal (STS), which is equivalent to Optical Carrier (OC) in its speeds.
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|Englisch:||synchronous optical network - SONET|