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Can be viewed as a matrix of nine rows of 90 octets every for a total of 810 octets. A few used for control they aren't positioned at the beginning or end of the frame.
First 3 cols - administration overhead.
The rest of the frame is called Synchronous Payload Envelope (SPE)
SPE contains transmission overhead and user data.
Payload can start anywhere in the frame.
A pointer from 1 to 3 of row 4 can determine the beginning address of the SPE.
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