EXFO iOLM - Manual (Page 54)

Managing Test Configurations
48 iOLM
Impacts of Test Configurations
Impacts of Test Configurations
Before performing an acquisition, you can select or edit a test configuration
that fits the link under test. This configuration contains specific pass/fail
thresholds and the definition of any expected PON splitter. Once selected,
the configuration will be used for all following measurements.
The configuration data is structured in the same way than an iOLM result
file. Each result file contains the entire configuration data used for the
measurement.
Using a test configuration may influence the minimum reach of the
measurement in terms of loss. For instance, the expected loss budget of a
link that includes splitters will force the acquisition to cover at least this
loss budget. Because of this, using an accurate test configuration can
improve the accuracy of the measurements. If an inaccurate configuration
file is used, some link element types might be wrongly defined. For
instance, if no splitter stage is defined, actual splitters will be described as
splices or connectors. This will not affect the reflectance and loss values
associated with the link elements, only their type. After a measurement is
completed, a link element type can be changed in order to apply the
correct pass/fail threshold.
The pass/fail thresholds defined in the configuration file will have no
impact on the capacity of the iOLM application to perform measurements.
Only the pass/fail status of the link or link elements will be determined by
the user-defined thresholds.