EXFO FTB-8100 Series Transport Blazer for FTB-500 - Manual (Page 242)

SONET Tabs
228 FTB-8100 Series Transport Blazer
Line RX (SONET)
Line RX (SONET)
Press TEST, Sec-Line, and Line (under Sec-Line RX).
Error Analysis
³
B2 (BIP-8, Bit-Interleave Parity - 8 bits): The B2 (BIP-8) error indicates a
Line parity error by performing an even-parity check over all bits of the
LOH and SPE of the previous frame (located in every STS-1 of an STS-n
signal).