esaProbeStatsSumAbsR2PJitter is a 64-bit performance counter that reports the running total (sum) of the absolute-value one-way jitter (magnitude of the delay swing regardless of direction), in microseconds, from the reflector back to the probe, applicable to Layer 3 ICMP-timestamp and Layer 2 Y.1731 probes, for the interval that is still being actively collected (the live bin). Because it discards the sign of the swing, this absolute-jitter figure from the reflector back to the probe gives a technician a single severity number to alarm on without watching the positive and negative jitter counters separately. For example, the technician can divide this live running total by the packet count reported in the same still-open bin to independently recompute the average absolute jitter from the reflector back to the probe before the bin rolls over.