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Section overhead

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The Section Overhead consists of the Regenerator Section, the Pointer mechanism, and the Multiplexer section, making a total of 81 bytes, (channels)of overhead information.

The Section Overhead consists of the alignment/trail trace/protection switching and 192kBit/s of SDH specific information plus Order-wire & maintenance channels. The Pointer mechanism are the H channels, which give the details of the payload for easy retrieval. The Multiplexer section gives the error monitoring/