EXFO IQS-8100 Series Transport Blazer for IQS-600 - Manual (Page 277)

SONET Tabs
SONET/SDH Application 263
LOP RX (SONET)
LOP RX (SONET)
Press TEST, LOP, and Path (under LOP RX).
Error Analysis
³
BIP-2 (Bit-Interleave Parity - 2 bits): 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).
³
REI-V (Remote Error Indicator): The REI-V error is declared when bit 3
of the V5 byte is set to “1”.
Note: Refer to Alarm/Error Measurements on page 47 for H/C LEDs, Seconds,
Count, and Rate information.
Alarm Analysis
³
AIS-V (Alarm Indication Signal - VT): The AIS-V alarm is declared when
V1 and V2 bytes for the VT path contain an all-ones pattern in three
consecutive superframes.
³
LOP-V (Loss Of Pointer - VT): The LOP alarm indicates that a valid
pointer is not found in N consecutive superframes (where 8 ≤ N ≤ 10),
or if N consecutive NDFs (“1001” pattern) are detected.
³
RDI-V (Remote Defect Indication - VT): The RDI-V alarm is declared
when bit 8 of the V5 byte contains “1” in five consecutive VT
superframes while bits 6 and 7 of the Z7 byte contain the “00” or “11”
pattern.