The answer is Optical Time Domain Reflectometer (OTDR). The test equipment that enables you to locate a break in a fiber-optic cable is Optical Time Domain Reflectometer (OTDR). It detects the location of a fault in a fiber cable by sending light down the fiber-optic cable and measuring the time required for the light to bounce back from the cable fault. The OTDR can then calculate the location of the fault.
