During the design stage, each cable run should have an estimate of the estimated losses based on the specifications of the components. After installation, it is necessary to test each fiber of all fiber optic cables to verify proper installation, comparing the measured loss with the estimated optical loss.
Commonly the installer will perform the following tests:
The continuity checks to determine that the fiber routing and/or polarization are correct and that the documentation is adequate.
Point-to-point insertion loss tests with a power meter and OLTS source. Multimode cables must be tested using TIA / EIA 526-14 Method B and single-mode cables using TIA / EIA 526-7 unless the compatibility of the test equipment of the connectors requires another reference method. The total loss should be less than that calculated in the estimated optical loss using the appropriate standards or customer specifications. If the test shows differences with the estimated losses, you must diagnose and solve them.
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Optionally, an OTDR can be used to verify cable installation and splicing operation. However, tests with OTDR should not be used to determine cable losses. If the cables are short, it is not appropriate to use an OTDR in internal plant installations. An experienced OTDR technician should determine when its use is appropriate.
If the design documentation does not include the length of the cable network, and this is not recorded during the installation, you should read the length from the distance marks on the cable jackets or test the fiber length using the option of Length available in an OTDR or some OLTS.
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