On-line

In telecommunication, the term on-line has the following meanings:

1. Pertaining to the operation of a functional unit when under the direct control of the system with which it is associated.

Note 1: On-line units are available for immediate use on demand by the system without human intervention.

Note 2: On-line units may not be independently operated.

2. Pertaining to equipment that is connected to a system, and is in operation.