Check the fiber in the end of the connector ferrule with a microscope, looking for dirt, cracks in the fiber or a really bad polish. Diagnosing the faulty one can be a problem. If only one fiber won’t transmit light, most likely a connector is bad. ![]() If none are good, better plan on pulling in a new cable. Use the visible fiber tracer to check other fibers. ![]() First, make sure it is a problem with just that fiber, not the entire cable. If the visual tracer does not shine through the fiber, you have several possible problems. Sometimes, there really is a fiber fault. An inexpensive fiber tracer will pay for itself in no time, as it is also a continuity tester, confirming that the fiber is capable of transmitting light. The solution is to use a visible light source-also called a fiber tracer or visual fault locator-to identify the fiber to be tested next. Since cables may have many fibers and color-coding is sometimes hard to see, it’s not unusual to have two techs working on each end of the cable connected to different fibers. More often than not, this is not a fiber or cable problem but simply an identification problem, where you are not dealing with the same fiber at both ends. Let’s look at some common problems and their likely causes. But even the best installers sometimes have problems, and finding the cause can sometimes be easy, sometimes confusing. ![]() What do you do next? How do you find the problem and fix it-fast? Fortunately, fiber optics is easy to install and experienced installers generally find that about 95 percent of all fibers they install will test good. The fiber optic cable you just installed failed testing.
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