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there are two common methods of testing a fiber-optic link one involves path through testing which gives you attenuation values for the whole link the other method involves an OTDR or optical time-domain reflectometer if you prefer the OTDR when in use is paired with a test fiber box and of course the test fiber box has to be of the same fiber as your system youll be testing in our case here well be testing two reels of fiber connected through a splice point for a single mode system the fiber needs to be at least 200 meters my box here contains 300 meters of fiber a typical otdrs screen has a y-axis and an x axis the x-axis measures distance and the y axis measures attenuation and reflection in units of decibels in addition you have an ability to select the step of system youre testing in this case its a single mode system and the wavelengths under which to test the system you can also select the length of the system and also the signal power which is selected by choosing various p