K-byte pass-through modes in the SDH frame structure

1. Paired-slot pass-through: overhead pass-through between paired slots (Pay attention to the paired relationship between the slots.)
2. Paired-port pass-through: overhead pass-through between paired optical ports on a board
3. In-board pass-through: overhead self-loopback, that is, overhead pass-through between the receive end and transmit end of a board (This mode is rarely used.)

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