A read-write integer, in seconds, setting a timeout for a loopback initiated from the far end of this interface's circuit. This controls how long the interface honors a far-end-initiated loopback request before automatically timing out, protecting against a remote loopback command leaving the local interface stuck in test mode indefinitely. An admin allowing a carrier's remote test equipment to loop the circuit for troubleshooting would rely on this timer to ensure the interface automatically restores itself to normal service afterward even if the far end doesn't explicitly release the loopback.