EXFO FTB-8510B Guia Del Usuario página 794

Port Tabs
Port RX (Electrical Interfaces)
Error Analysis
Possible errors that can be detected are:
For DS1 and DS3
BPV (Bipolar Violation): A BPV error indicates that pulses of the same
consecutive polarity were detected, in violation with the bipolar signal
format.
EXZ (Excessive Zeros)
For DS1 with AMI Line Coding: Indicates that more than 15
consecutive bit periods with no pulses have been received.
For DS1 with B8ZS Line Coding: Indicates that more than 7
consecutive bit periods with no pulses have been received.
For DS3: Indicates that more than 2 consecutive bit periods with no
pulses have been received.
For E1, E2, E3, E4, STS-1e/STM-0e, and STS-3e/STM-1e
CV (Code Violation): A CV error indicates that pulses of the same
consecutive polarity were detected, in violation with the bipolar signal
format.
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FTB-8100 Series Transport Blazer