Chapter 7 Automated RFC 2544 Testing
About the Packet Jitter test
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HST-3000 Ethernet Testing User’s Guide
unavailable. Delay measured under 4 microseconds is aver-
aged as 4 microseconds. Unavailable measurements are not
included in the total trial average.
Latency test
test results
See Figure 44 on page 225 for sample result measurements.
Pass/fail
threshold
You can configure the test to optionally indicate whether the
Latency test passed or failed. To do so, you specify the
Latency (RTD) Pass Threshold. If the total trial average for
measured average delay is equal to or less than the threshold,
the test indicates that the test passed for each transmitted
frame length. If it exceeds the threshold, the test indicates that
the test failed.
About the Packet Jitter test
If you intend to run the Packet Jitter test as part of the test, you
must also run the Throughput test. The Packet Jitter test
transmits traffic at the maximum bandwidth at which no
frames were lost (determined using the Throughput test) for
each frame length you selected. The packet jitter is then
measured after transmitting traffic for each frame length for
the period of time that you specified as the Packet Jitter Trial
Duration.
NOTE:
When running the Latency test in asymmetric mode, after
looping up the instrument on the far end, the instrument
performs a symmetric throughput test. Because the instru-
ment loops up the far end instrument, the upstream and
downstream latency measurements in asymmetric mode
are actually the same measurement.
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