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IM AQ1300-01EN
1.16 RFC2544 Measurement (AQ1300 Option)
RFC2544 was published by the IETF. This document contains evaluation methods (benchmark tests)
for measuring the processing capabilities of network devices.
The AQ1300/AQ1301 can perform the following measurements contained in RFC2544. The test
configuration that you need to use for these measurements is Loopback Traffic Test, in which the other
device is set to Loopback Test mode.
• Throughput
• Latency
• Frame loss rate
• Back to back
For each measurement, the length of transmit and receive frames is changed automatically to retrieve
a measured value. Then, the processing capability for each frame length is displayed on a graph.
In addition to the features listed above, the AQ1300/AQ1301 can measure the frame signal delay
variations when these frame signals travel across the network.
• Delay variations (packet jitter)
Throughput Measurement
The throughput measurement measures the maximum amount of traffic (rate) that a network device
can transmit without losing frame signals. In this measurement, a fixed number of frame signals are
transmitted (at the initial rate) over the specified measurement time (the test duration).
During the test duration, if a loss is detected, the rate is automatically decreased. The AQ1300/
AQ1301 performs another measurement to detect whether a loss occurs at this new rate. If a loss is
detected, the same operations are repeated. These operations are repeated until the rate is decreased
to the specified minimum rate.
During the test duration, if no losses are detected, the rate is automatically increased. The AQ1300/
AQ1301 performs another measurement to detect whether a loss occurs at this new rate. If no losses
are detected, the same operations are repeated. These operations are repeated until the rate is
increased to the specified maximum rate.
These rate increasing and decreasing operations are repeated until the difference (the resolution)
between the rates when a loss was detected and when no losses were detected reaches a value that
is equal to or less than the specified value. The series of operations from the start of measurement to
the point where the rate converges to this specified value is a single measurement (a trial).
The specified number of trials are measured, and the average of the rates at the end of each trial is
the throughput value.
Test traffic rate
Test duration
One trial
Time
Loss
No
loss Loss Loss
Loss
No
loss
100%
40%
60%
50%
45%
47.5%
Resolution
Measured result of the throughput test
Fail
Fail
Fail
Fail
Pass
Pass
Loss
80%
Fail
If a loss is detected at 100% test traffic rate, the rate is decreased to
80%. If a loss is detected at a rate other than 100%, the rate is
decreased to half its original rate.
For the test configuration, see “Two-Way Traffic Test” in section 1.4.
