Pls see below summarized Voice Probe results. I want to know what is Stddev: 14872 (highlighted below). Can it be considered as jitter - variation in Delay?
>show services rpm probe-results Owner: ipcore, Test: LHR01-ISB01:Voice Target address: 10.0.254.106, Probe type: udp-ping-timestamp, Test size: 15 probes Probe results: Response received, Fri Oct 31 18:57:20 2008, No hardware timestamps Rtt: 6474 usec, Ingress time: 1788 usec, Egress time: 4595 usec Results over current test: Probes sent: 14, Probes received: 14, Loss percentage: 0 Measurement: Round trip time Samples: 14, Minimum: 6428 usec, Maximum: 7891 usec, Average: 6621 usec, Peak to peak: 1463 usec, Stddev: 359 usec, Sum: 92698 usec Measurement: Ingress delay Samples: 14, Minimum: 1763 usec, Maximum: 2004 usec, Average: 1812 usec, Peak to peak: 241 usec, Stddev: 57 usec, Sum: 25368 usec Measurement: Egress delay Samples: 14, Minimum: 4561 usec, Maximum: 6023 usec, Average: 4719 usec, Peak to peak: 1462 usec, Stddev: 363 usec, Sum: 66064 usec Results over all tests: Probes sent: 1348964, Probes received: 1347814, Loss percentage: 0 Measurement: Round trip time Samples: 1347814, Minimum: 6139 usec, Maximum: 211885 usec, Average: 15810 usec, Peak to peak: 205746 usec, Stddev: 14872 usec, Sum: 21309133636 usec
The variation in packet delay is called jitter.
STDDEV returns the sample standard deviation of expr, a set of numbers. You can use it as both an aggregate and analytic function