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there are two common methods of testing a fiber optic clink one involves PA 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 TDR when in use is paired with a test fiber box and of course a test fiber box has to be of the same fiber as your system youamp;#39;ll be testing in our case here weamp;#39;ll be testing two reels of fiber connected through a splice point for a single modood system the fiber needs to be at least 200 M my box here contains 300 M of fiber a typical otdr screen has a y- AIS and an x-axis the x-axis measures distance and the Y AIS measures attenuation and reflection in units of decb in addition you have an ability to select the type of system youamp;#39;re testing in this case itamp;#39;s 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 uh selected by c