EXFO FTB-8510B Guia Del Usuario página 1273

Glossary
SONET - Section Overhead (SOH)
B1: 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 frame of a composite signal (STS-1 to STS-n). This byte
is only defined for the first STS-1 frame of a composite signal.
E1: Orderwire
The Orderwire provides a 64 Kbps voice channel for communication
between two STEs (Section Terminating Equipment). This byte is only
defined for the first STS-1 frame of a composite signal.
F1: User
The User byte is reserved for user purposes. This byte is only defined for
the first STS-1 frame of a composite signal.
D1, D2 and D3: Data Communications Channel
(DCC)
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 STS-1 frame of a composite
signal.
623
SONET/SDH Application