OTDR is a comprehensive test of fiber optic cable that can accurately pinpoint trouble spots in the network. OTDR testing uses an Optical Time Domain Reflectometer to send light pulses into the optical. Fiber Optic Testing Testing is used to evaluate the performance of fiber optic components, cable plants and systems. The test conditions should be similar to how the actual cable plant will be used when communications equipment is connected (see drawing below. Related: Fiber Optic Connectors – Identification Guide Regularly testing fiber optic cables helps minimize network downtime. IEC 60794 is the international standard series governing the design, construction, and performance verification of fibre optic cables. Published by the International Electrotechnical Commission, it defines the mechanical, environmental, and optical tests that every cable must pass before it can be.