Agilent Technologies N2620A - Manual (Page 69)

Network Testing with the FrameScope Pro 2
N2620A User’s Guide 51
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 the network
devices did not forward 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 is shown as a percentage
of frames forwarded by the network. The data rate is reduced by
a step size of 10% (the step size is configurable), until two
successive measurements without a single frame loss or until
10% traffic level (the lowest step size) is reached.
The test is conducted over a range of frame lengths. The test can
be performed in either loopback, unidirectional, or bidirectional
mode. Loopback mode is similar to bidirectional test, with the
only difference being the destination is a loopback device
instead of another FrameScope Pro.
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 frame loss. The trial length must be at least 2 s 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 perform in either loopback, unidirectional, or
bidirectional mode. Loopback mode is similar to bidirectional
mode, with the only difference being the destination is a
loopback device instead of another FrameScope Pro.
For better results, adjust the duration to load the
device-under-test sufficiently.