OFF LINE

1. Pertaining to the operation of a functional unit when not under the direct control of the system with which it is associated. ( 188 ) Note 1: Off- line units are not available for immediate use on demand by the system. Note 2: Off-line units may be independently operated. 2. Pertaining to equipment that is disconnected from a system, is not in operation, and usually has its main power source disconnected or turned off.