The principle reason for testing fiber optic cable is to verify continuity and look for attenuation. This test requires a special testing kit and protective eyewear, but it will help you diagnose problems with the cable's. Fiber Optic Testing Testing is used to evaluate the performance of fiber optic components, cable plants and systems. As the components like fiber, connectors, splices, LED or laser sources, detectors and receivers are being developed, testing confirms their performance specifications and helps. Understanding the visual signs of fiber damage, knowing how to test them, and applying proper maintenance methods can dramatically reduce downtime and improve network reliability.