EXFO iOLM - Manual (Page 63)

Managing Test Configurations
intelligent Optical Link Mapper 57
Modifying a Test Configuration
6. Select the split ratio of a splitter at a given stage.
Select 1:? if the splitter ratio is unknown. The iOLM finds the splitter
ratio automatically and the element is not tested for pass/fail.
If None is selected as Splitter Ratio Stage, then the iOLM will not try to
find or apply a split ratio at the given stage.
The PON network can have multiple splitters. The iOLM application
supports testing a PON network having maximum of three splitters. So,
the splitter ratios can be defined up to three stages.
Note: The splitter ratios are defined at different stages, depending on how they
are defined in the network.
Note: The link view displays the link element closest to the iOLM module to the
left and then proceeds towards the right.

Core size: When a multimode port is selected, the default fiber
core size is 50 m.

IOR: Refraction index of the iOLM measurement, also known as
group index. If you modify this parameter, the distance
measurements for the trace will be adjusted.

Backscatter (dB): Rayleigh backscatter coefficient setting of the
iOLM measurement. If you modify this parameter, the reflectance
and ORL measurements for the trace will be adjusted.
Note: For the multimode wavelengths, the values are defined at 850 nm. For the
singlemode wavelengths, the values are defined at 1550 nm. The iOLM
application automatically calculates the IOR and Backscatter values for
other wavelengths.