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of two components:
:;Payload overhead (POH): 9 octets used for end-to-end signaling and error measurement.
:;Payload: User data (774 bytes for STM-0/STS-1, or 2,430 octets for STM-1/STS-3c)

For STS-1, the payload is referred to as the synchronous payload envelope (SPE), which in turn has 18 stuffing bytes, leading to the STS-1 payload capacity of 756 bytes.

The STS-1 payload is designed to carry a full PDH DS3 frame. When the DS3 enters a SONET network, path overhead is added, and that

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