EXFO FTB-8510B Guia Del Usuario página 1285

Glossary
SDH - Regenerator Section Overhead (RSOH)
B1: RS BIP-8
The BIP-8 (Bit-Interleaved Parity) byte provides section error monitoring.
The byte is calculated by performing a routine even-parity check over all
bits of the previous STM-N frame. This byte is only defined for the first
STM-1 frame of a composite signal.
E1: RS Orderwire
The Orderwire provides a 64 kbps voice channel for communication
between two STEs. This byte is only defined for the first STM-1 frame of a
composite signal.
F1: RS User Channel
The User Channel byte is reserved for user purposes. This byte is only
defined for the first STM-1 frame of a composite signal.
D1, D2 and D3: RS DCC (Data Communications
Channel)
The Data Communication Channel (D1, D2 and D3) provides a 192 kbps
data communication between two STEs for operation functions such as
OAM&P. This byte is only defined for the first STM-1 frame of a composite
signal.
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SONET/SDH Application