EXFO FTB-8100 Series Transport Blazer for FTB-500 - Manual (Page 247)

SONET Tabs
SONET/SDH Application 233
Line RX (SONET)
For OC-768: The REI-L error is declared when the combination of the
M0 and M1 bytes indicates that one or more BIP violations have been
detected.
Alarm Analysis
³
AIS-L (Alarm Indication Signal - Line): The AIS-L alarm is declared
when bits 6, 7 and 8 of the K2 byte contain the “111” pattern in five
consecutive frames.
³
RDI-L (Remote Defect Indication - Line): The RDI-L alarm is declared
when bits 6, 7, and 8 of the K2 byte contain the “110” pattern in five
consecutive frames.
M0
Located in STS-1 #4
M1
Located in STS-1 #7
Indicates
0000 0000 0000 0000 0 BIP violation
0000 0000 0000 0001 1 BIP violation
0000 0000 0000 0010 2 BIP violations
: :
0001 1000 0000 0000 6144 BIP violations
0001 1000 0000 0001 0 BIP violation
: :
1111 1111 1111 1111 0 BIP violation