SONET Frame Format

A SONET frame format is also called a synchronous payload Envelope (SPE). The basic transmission signal is STS-1. The frame format of the STS-1 signal is shown in Fig. 10.16. In general, the frame is divided into a transport overload and the synchronous payload envelope (SPE). The SPE further divided into STS path overhead (POH) and the pay load. Once the pay load is multiplexed into synchronous payload envelope, it can transported and switched through SONET without having to be examined and possible demultiplexes at intermediate nodes. Thus, SONET is said to be service independent or transparent.

I*— Transport ^^-Synchronous payload envelope (SPE)-

overhead

I*— Transport ^^-Synchronous payload envelope (SPE)-

overhead

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