EXFO FTB-8510B Guia Del Usuario página 880

SONET Tabs
Line RX (SONET)
For STS-3e and OC-3: The REI-L error is declared when the M1 byte
located in the STS-1 #3 indicates that one or more BIP violations have
been detected
230
M1, bits
234 5678
000 0000
000 0001
000 0010
:
001 1000
001 1001
:
111 1111
Indicates
0 BIP violation
1 BIP violation
2 BIP violations
:
24 BIP violations
0 BIP violation
:
0 BIP violation
FTB-8100 Series Transport Blazer