Chapter 7 Automated RFC 2544 Testing
About the Latency (RTD) test
HST-3000 Ethernet Testing User’s Guide
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These results are also reported when you run the Latency and
Packet Jitter tests. See
Figure 42 on page 223 for sample
graphical results and result measurements.
Pass/fail
threshold
You can configure the test to optionally indicate whether the
Throughput test passed or failed. To do so, you specify the
bandwidth for the Throughput Pass Threshold. If the highest
rate at which frames are not lost is equal to or exceeds the
threshold, the test indicates that the test passed for each
transmitted frame length. If it falls below the threshold, the test
indicates that the test failed.
About the Latency (RTD) test
If you intend to run the Latency test as part of the test, you
must also run the Throughput test. The Latency 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 average delay is then measured after trans-
mitting traffic for each frame length for the period of time that
you specified as the Latency (RTD) Trial Duration.The test
measures delay for each trial (specified as the Number of
Latency (RTD) Trials), and each measurement is then added
to a running total. After all of the trials are complete, the
running total is divided by the number of trials to come up with
a total trial average.
If the Throughput test reached the lowest bandwidth limit
without ever successfully receiving all transmitted frames (in
other words, it lost frames), the average delay will also be
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