1-45
IM AQ1300-01EN
Features
3
2
1
4
5
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7
8
9
10
11
12
13
14
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16
App
Index
Frame Loss Rate Measurement
In the frame loss rate measurement, frame signals are transmitted to the network device at a traffic
rate that exceeds the frame signal transfer capability of the network device, and the frame loss rate is
measured for each frame length.
In this measurement, the frame loss rate is measured while the rate is continually stepped down from
the initial rate that the measurement started at until losses are no longer detected.
The series of operations from the start of measurement to the finding of the rate at which losses are no
longer detected is a single measurement (a trial).
Test traffic rate
Time
Loss
Loss Loss
Loss
No
loss
100%
90%
80%
70%
60%
50%
Fail
Fail
Fail
Fail
Pass
Loss
Fail
Loss
Fail
40%
If no frame losses are detected for
two consecutive rates, no frame
signals at lower rates are measured.
No
loss
Pass
30%
The frame loss rate is computed using the following equation.
Frame loss rate (%) =
Number of input frames - number of output frames
Number of input frames
×100
Test Duration
This is the time that frame signals are transmitted for during a frame loss rate measurement at a
single rate.
Number of Trials
The number of times that the AQ1300/AQ1301 will perform the series of operations from the
start of measurement to the point where the rate at which losses are no longer detected is found.
In one trial, frame signals of the preset frame lengths are used to perform the frame loss rate
measurements. The frame loss rate is the average of the values from all the trials.
Initial Rate
The traffic rate that is used when the frame loss rate measurement starts.
Step Down
After the measurement starts, the AQ1300/AQ1301 continually detects for losses while it
automatically decreases the traffic rate by the specified step.Measurement is stopped automatically
when a rate is found at which losses are no longer detected.
Pass/Fail Judgment
You can perform pass/fail judgments by setting the frame loss rate threshold (the rate’s upper limit)
on the AQ1300/AQ1301 in advance.If the value exceeds the threshold, a fail judgment occurs.
1.16 RFC2544 Measurement (AQ1300 Option)