This is the average packet-delay-variation (jitter) recorded across sampled test frames at this frame size, the primary figure used to check jitter-sensitive services like VoIP or synchronization circuits against their SLA tolerance. An admin compares this average against the service's jitter budget directly, since even moderate average PDV can degrade voice quality or timing distribution well before it becomes visible in the throughput or loss numbers. For example, an average PDV of 200 microseconds on a circuit carrying PTP timing traffic with a 100-microsecond budget would fail that service's requirements even though the throughput and loss results look perfectly clean.