EXFO IQS-8100 Series Transport Blazer for IQS-600 - Manual (Page 339)

SDH Tabs
SONET/SDH Application 325
Multiplex Section RX (SDH)
For STM-256: The MS-REI error is declared when the combination of
the M0 and M1 bytes indicates that one or more BIP violations have
been detected.
M0
Located in STM-1
channel 2 (timeslot #4)
M1
Located in STM-1
channel 3 (timeslot #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