EXFO FTB-5600 Distributed PMD Analyzer - Manual (Page 71)

Managing Results
Distributed PMD Analyzer 65
Section Status
The percentage value of the first section is :
The percentage value of the second section is :
In this example, removing the 10-ps section will make the cumulative PMD
square of the link fall from 125 ps
2
to 25 ps
2
. In a linear scale, it would fall
from 11.18 ps to 5 ps. You must therefore always remember that the
contribution is computed as square values.
Section Status
You can view the status of the section at all times in the table. If there is a
problem with the PMD of a section, you can see a status in the table that
will help you identify the quality of the measurement.
The statuses are explained in the table below:
Contribution
5
2
100% ⋅
10
2
5
2
+
------------------------ 20% = =
Contribution
10
2
100% ⋅
10
2
5
2
+
--------------------------- 80% = =