User manual

5-7
Stress Test
Latency
NOTE: Select another Setup button visible on the screen or by scrolling to
the right or left with the white arrows or select the Exit button.
Chapter 5
Latency
Test results are shown as the minimum, average and maximum latency
time (in microseconds) for each size frame that is tested. The total
number of packets used in the Latency test is determined by the length of
time and number of tests selected in Setup. One row of data is shown for
each enabled frame size (up to 7 rows).
When the latency time varies, it causes issues with real-time services.
For example, latency variation in VoIP applications would degrade the
voice quality. Long latency can also degrade Ethernet service quality. In
client-server applications, the server might time out or poor application
performance can occur.
The screen on the left shows very small latency times which we would
expect from going through only one switch.
The screen on the right shows much longer latency times. This is due to the
fact that the sent packets have to go through different medias (i.e. copper
and radio link) and speeds to make a roundtrip.