Abstract: A system for determining the locations of faults on a cable by determining the positions of transformers is described. The locations of transformers can be determined in a reflected signal trace resulting from a voltage pulse coupled into the cable. The reflected pulse signals on the reflected signal trace from the transformers follow a predictable attenuation pattern. Therefore, an algorithm executing on a computer system can be utilized to determine the location of transformers in a reflected signal trace. A fault can then be located by, for example, applying a high voltage to the cable and measuring a new reflected signal trace which shows reflection from the fault. The fault, then, can be located relative to neighboring transformers.