Exactly as described, this is a simple on/off switch enabling the packet delay variation, or jitter, sub-test as part of this profile's overall test run. This sub-test shares the same MaxSamples and SamplingInterval configuration as the latency test, so enabling PDV alongside latency effectively gets jitter measured for free from the same sampling run rather than requiring a separate dedicated test pass. For example, a voice-service acceptance profile would typically enable both LatencyTest and PdvTest together, since a real VoIP SLA cares about both absolute delay and its variation, not just one or the other.