EXFO FTB-800 Series for FTB-1 User Manual
Page 282
Test Results
272
FTB-700G/800 Series
Alarms/Errors
Errors
BEI (Backward Error Indication)
RX: SM BEI errors are received from the DUT (value 0 to 8).
BIP-8 (Bit Interleave Parity-8)
RX: There is a SM BIP-8 mismatch between the received value and
locally computed value (0 to 8).
FAS (Frame Alignment Signal)
RX: The FAS bits are in error.
FEC-CORR (Forward Error Correction - Correctable)
RX: Statistics on codewords (CW; default), symbols (SYMB), or bits
(BIT) corrected by the FEC.
TX:
FEC-CORR-CW (Forward Error Correction - Correctable -
Codeword): Generates 8 symbols (bytes) containing 8 bits in error
each, in each codeword.
FEC-CORR-SYM (Forward Error Correction - Correctable -
Symbol): Generates 1 symbol (byte) containing 8 bits in error.
FEC-CORR-BIT (Forward Error Correction - Correctable - Bit):
Generates 1 symbol (byte) containing 1bit in error.
OTU BEI bits
(1234)
BIP violations
ODUk 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