This read-only INTEGER reports the distance, in centimeters, from the port to the fault point detected on a cable pair, where -1 indicates the value is invalid (none) and -2 indicates the measurement is unsupported. Admins use it to physically locate a break or short in a cable run without having to inspect the entire cable length. For example, a value of 1200 tells an admin the fault lies roughly 12 meters from the switch port, letting them target that section of cable for inspection.