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58 Agilent FrameScope Pro User’s Manual
2 Network Testing with the FrameScope Pro
Performance Tests
between the entrance and exit times of the tagged frame. The
reported latency is an average of at least 20 trials. The test is
conducted over a range of frame sizes.
For better results, adjust the duration to load the device under
test sufficiently.
RFC 2544 Frame Loss Rate Test
This test measures the percentage of frames that are not
forwarded by network devices due to lack of resources for entire
range of frame length and data rates.
For a specific frame length, traffic is sent at the maximum rate
(100% load). The number of frames received is compared against
the number of frames transmitted and shown as a percentage of
frames forwarded by the network. The data rate is reduced by
step size of 10% (configurable) until two successive
measurements, without single frame loss or till 10% traffic
level(lowest step size) is reached.
The test is conducted over a range of frame lengths. The test can
be performed either in loopback or unidirectional or
bi-directional mode. Loopback mode is similar to bi-directional
test, the only difference is the destination is a loopback device
instead of another FrameScope.
For better results, adjust the duration to load the device under
test sufficiently.
RFC 2544 Back to Back Test
This test measures the maximum number of back to back
frames that the network can transfer without loss.
For a specific frame length, a burst of back to back frames is
sent to a destination device through the network. Similar to the
throughput test, a binary search of burst sizes is done to find
the maximum burst size that can be forwarded by the network
with no loss of frames. The trial length must be at least 2
seconds and the results of at least 50 trials should be averaged
for the displayed value. The test is conducted over a range of
frame lengths.
The test can be performed either in loopback or unidirectional
or bi-directional mode. Loopback mode is similar to
bi-directional test, the only difference is the destination is a
loopback device instead of another FrameScope.
For better results, adjust the duration to load the device under
test sufficiently.