EXFO FTB-800 Series for FTB-1 - Manual (Page 278)

Test Results
268 FTB-700G/800 Series
Alarms/Errors
Errors

BIP-8 (Bit Interleave Parity-8)
RX: There is a TCM BIP-8 mismatch between the received value and
locally computed value (0 to 8).

BEI (Backward Error Indication)
RX: Interleaved block in error detected by the corresponding ODU
tandem connection monitoring sink using the BIP-8 code.
ODU TCM BEI
bits (1234)
BIP violations
ODU BEI bits
(1234)
BIP violations
0000 0 0101 5
0001 1 0110 6
0010 2 0111 7
0011 3 1000 8
0100 4 1001 to 1111 0