EXFO FG-750 User Manual
Page 215
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Analyzing Results
Fiber Guardian
201
Viewing the Current Fault List
Analyzing the OTDR Trace and Characterization
Table
If you are an experienced user, you will find the Trace Viewer particularly
useful. With this utility, you can make a complementary analysis of the
optical fiber link. By comparing the current OTDR measurement to the four
other results provided (reference, minimum, maximum, and average), you
may be able to give a more complete evaluation of the optical link’s state
than what the application achieves by itself.
The reference corresponds to the OTDR measurement that was made
the very first time the test setup was run. The analysis of this first OTDR
measurement determined the structure of the event characterization
table that is associated to the test setup.
During the learning period, many measurements are made on the test
setup. At each distance position of the OTDR measurement, the
application keeps the minimum value measured. The Min trace
corresponds to a “reconstruction” of an OTDR measurement, using the
minimum value measured at each distance position.
In a very similar way, the Max trace displays a “reconstruction” of an
OTDR measurement, using the maximum value measured at each
distance position.
Finally, during the learning period, at each distance position of the
OTDR measurement, the application keeps the average value. The Avg
trace corresponds to a “reconstruction” of an OTDR measurement,
using the average value calculated at each distance position.