This attribute indicates the total number of Path Code Violations
(PCVs) detected. Each PCV corresponds to a P-bit parity error, or
possibly a frame error or a disagreement between P-bits or X-bits.
PCV counting is inhibited over second intervals where a Path
Severely Errored Second (PSES) is counted. Counting of PCVs is
also inhibited over second intervals where a Path Unavailable
Second (PUAS) is counted.
This attribute is a non-negative integer which monotonically
increases until it reaches a maximum value, at which point it wraps
around and starts increasing again from zero.