EXFO IQS-8100 Series Transport Blazer for IQS-600 - Manual (Page 335)

SDH Tabs
SONET/SDH Application 321
Multiplex Section RX (SDH)
Error Analysis
³
B2 (BIP-Nx24, Bit-Interleave Parity - Nx24 bits): The B2 error indicates a
Multiplex Section parity error by performing an even-parity check over
all bits (except those in the RSOH bytes) of the previous frame of a
STM-N signal.
³
MS-REI (Multiplex Section - Remote Error Indicator):
For STM-0e: The MS-REI error is declared the M1 byte located in the
STM-1 channel 1 (first timeslot) indicates that one or more BIP
violations have been detected.
M1, 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