This read-write Integer32 (2..300) allows an administrator to specify the duration for a timed loopback on the OCn Path, per its description, so the test loopback clears automatically after that period. It protects against leaving a path-level loopback active indefinitely after testing. For example, testing one tributary path within a multiplexed OCn interface, a technician would set a short timed value here so only that path's loopback self-clears without affecting other paths.