Testing the entire cable network implies that insertion loss tests are carried out with a light source and a power meter, or with an optical loss test equipment (OLTS) in accordance with the OFSTP-14 test procedure of the TIA standard for multimode or OFSTP-7 for single mode. The test plan must specify the method to set the reference level of “0 dB” chosen (one, two or three reference wires), as this will affect the value of the loss. The TIA 568 standard recommends the reference of a cable, but this may not be an option for all combinations of testing equipment and cable network connectors.
OTDR tests are not mandatory, nor are they sufficient in themselves to obtain the certification of the cable network. However, long runs of external plant cable that include splices can be tested with an OTDR to verify the operation of the splices and detect possible problems caused by tension in the cable during installation. While there are those who defend the OTDR to test all types of cable network installations, including short wiring in the internal plant, it is not mandatory according to industry standards nor is it recommended for wiring in the internal plant.
Coordination of tests and documentation
The test plan must be coordinated with the documentation of the cable network. This should indicate the links to be tested and the expected results according to the estimated optical loss calculations. Likewise, the test plan must specify the way in which the test data will be included in the documentation in order for the installation to be accepted and in case it should be consulted because of possible future problems that require an emergency restoration.
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