EXFO FTB-7000 OTDR Series for FTB-500 - Manual (Page 93)

Testing Fibers in Advanced Mode
OTDR 79
Setting Pass/Fail Thresholds
The following table provides the default, minimum and maximum
thresholds.
Once the thresholds are set, the application will be able to perform
Pass/Fail tests to determine the status of the various events (pass, warning,
fail).
The Pass/Fail test is performed on two occasions:
³
when analyzing or reanalyzing a trace
³
when you open a trace file
By default, when the thresholds are set, the application displays symbols in
the Result tab to identify the events’ status. Values that are greater than the
predefined fail thresholds are displayed in white on a red background in
the events table. Values that are greater than the predefined warning
thresholds are displayed in black on a yellow background.
You can also set the application to display pass/fail messages when the
Pass/Fail test is performed (see Displaying or Hiding Pass/Fail Messages on
page 114).
Test Default Minimum Maximum
Splice loss (dB) 0.500 0.015 5.000
Connector loss (dB) 1.000 0.015 5.000
Reflectance (dB) –40.00 –80.00 0.00
Fiber section attenuation (dB/km) 0.40 0.00 5.000
Span loss (dB) 45.000 0.000 45.000
Span length (km) 0.00 0.0000 300.0000
Span ORL (dB) 15.00 15.00 40.000