EXFO IQS-8100 Series Transport Blazer for IQS-600 - Manual (Page 243)

SONET Tabs
SONET/SDH Application 229
Line RX (SONET)
³
REI-L (Remote Error Indicator - Line):
For STS-1e: The REI-L error is declared when the M0 byte located in the
first STS-1 indicates that one or more BIP violations have been
detected.
M0, bits
234 5678
Indicates
000 0000 0 BIP violation
000 0001 1 BIP violation
000 0010 2 BIP violations
: :
000 1000 8 BIP violations
000 1001 0 BIP violation
: :
111 1111 0 BIP violation