EXFO FTB-800 Series for FTB-1 - Manual (Page 300)

Test Results
290 FTB-700G/800 Series
Alarms/Errors

ERDI-VCD (Enhanced RDI - VT Connectivity Defect) - SONET
LP-ERDI-CD (LOP - Enhanced RDI - Connectivity Defect) - SDH
RX: Bits 5, 6, and 7 of the Z7 (SONET) / K4 (SDH) byte contain the “110”
pattern, and bit 8 of the V5 byte contain “1”, in five consecutive VT/LP
superframes.
TX: Generates a “110” pattern for bits 5, 6, and 7 of the Z7 (SONET) / K4
(SDH) byte, and “1” for bit 8 of the V5 byte.

ERDI-VPD (Enhanced RDI - VT Path Payload Defect) - SONET
LP-ERDI-PD (LOP - Enhanced RDI - Path Payload Defect) - SDH
RX: Bits 5, 6, and 7 of the Z7 (SONET) / K4 (SDH) byte contain the “010”
pattern, and bit 8 of the V5 byte contain “0”, in five consecutive VT/LP
superframes.
TX: Generates a “010” pattern for bits 5, 6, and 7 of the Z7 (SONET) / K4
(SDH) byte, and “0” for bit 8 of the V5 byte.
Errors

BIP-2 (Bit-Interleave Parity - 2 bits)
RX:
SONET: The BIP-2 error indicates a parity error by performing a
routine even-parity check over all VT1.5 bytes of the previous frame
of a composite signal (VT1.5/VT2/VT6).
SDH: The BIP-2 error indicates a Low Order Path parity error by
performing a routine even-parity check over all bytes of the
previous VC frame.

REI-V (Remote Error Indicator - VT) - SONET
LP-REI (Low Order Path - Remote Error Indicator) - SDH
RX: REI is declared when bit 3 of the V5 byte is set to “1”.