Per its DESCRIPTION, this Counter64 counts P-bit parity errors in the DS3 M-frame overhead, which reflect framing-bit mismatches typically attributable to the far-end signal. Because this is a lifetime counter that only resets on an explicit clear, a reading here means P-bit parity mismatches from the far end have accumulated on this DS3 circuit, accumulated over the port's entire service life, not merely since the last reboot. For example, a reading of 48 events in this bin on this DS3 circuit with the corresponding line-side Cvl staying flat would point the fault toward the far-end equipment rather than this local circuit.