Per its DESCRIPTION, this Counter64 counts one-second intervals with at least one P-bit parity error. Because this row is one of the already-completed short intervals rather than the one still filling, a reading here means the DS3 circuit logged a P-bit errored second on this DS3 circuit, within that one specific closed interval, which you can pin to an exact clock window using this row's StartTime and EndTime. For example, a reading of 22 seconds in this bin on this DS3 circuit rising in lockstep with Pcv confirms the far-end parity errors are frequent enough to affect whole seconds, not just isolated bits.