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IM AQ1300-01EN
Features
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App
Index
Delay Variation (Packet Jitter) Measurement
In the delay variation measurement, the AQ1300/AQ1301 measures the delay variations when a
network device transmits frame signals. In this measurement, a fixed number of frame signals are
transmitted (at the test rate) over the specified measurement time (the test duration). The AQ1300/
AQ1301 then measures the frame signal delay in units of the specified test window size.
The maximum variation width and minimum variation width of the delays are measured per sampling
period. For each sampling period, the largest and smallest values are selected as the measured
results for the sampling period and are displayed on a graph. Additionally, the statistically processed
variation widths of each sampling period are displayed on the graph as percentile variations.
Variation width (maximum)
Time
Delay
Sampling time
Test duration
Test Duration
This is the length of one measurement for measuring delay variations.
Number of Trials
The number of times that delay variations are measured. For each trial, the delay variation
measurement is performed for the time specified by the test duration.In one trial, frame signals of
the preset frame lengths are used to perform the delay variation measurements.
The delay variation is the average of the values from all the trials.
Test Rate
The traffic rate that the AQ1300/AQ1301 uses to measure the delay variation. You can change the
test rate value. If you have already performed the throughput measurement, you can set the traffic
rate to the measured throughput result.
Test Window Size (Sampling Time)
The AQ1300/AQ1301 measures frame signal delay variations in units of the specified length of time.
Resolution
This is the percentile variation value’s measurement resolution. The variation value measurement
ranges for all the resolutions are shown below.
Resolution
Measurement Range
0.05 ms
0 ms to 3.00 ms
0.1 ms
0 ms to 6.00 ms
0.5 ms
0 ms to 30.00 ms
1.0 ms
0 ms to 60.00 ms
2.5 ms
0 ms to 150.00 ms
5.0 ms
0 ms to 300.00 ms
If you set Resolution to Auto, the AQ1300/AQ1301 statistically processes the frame signal delay
that was sampled during the preliminary measurement, which was done before the start of the test,
and automatically sets the resolution to the most appropriate value.
1.16 RFC2544 Measurement (AQ1300 Option)
