One embodiment is a method that includes retrieving key performance indicators from multi-tone signals captured by a data collector located in a cable network; identifying a fault signature based on the key performance indicators, in which the fault signature is identified based on phase domain analysis of a channel response; and accessing a data repository located in a cloud network for geographical information associated with the cable network. The method further includes determining a location of a fault in the cable network based on the fault signature and the geographical information, in which the determining further includes: determining a length of a fault cavity associated with the fault; identifying at least one segment having a length the same as the length of the fault cavity; identifying terminating devices associated with the at least one segment; and tagging the identified terminating devices as potentially faulty.