As indicated in the figure, the STM – n signal is multiples of frames consisting of 9 rows with 270 bytes in each row.
The order of transmission of information is first from left to right and then from top to bottom.
The first 9 bytes in each row are for information and used by the SDH system itself.This area is divided into 3 parts.
Regenerator Section Overhead(RSOH)
Multiplex Section Overhead(MSOH)
Pointers
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