EXFO VDSL2 - Manual (Page 239)

Running a VoIP Test
Copper, VDSL2, ADSL2+, and IP Triple-Play Test Set 231
Reading Results
Jitter Analysis
The Jitter Analysis tab allows you to view the PASS/FAIL status of the
quality of the call by displaying an estimate of the variance of the real-time
transport protocol (RTP) data packet inter-arrival time.
The available test results are:
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Jitter Average is the continuous
running average jitter.
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Jitter Maximum is the maximum
jitter detected.
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Std. Deviation is the standard
deviation based on the continuous
sample size.
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Reset Statistics button sets all monitoring values to 0.