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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.

Source: from Federal Standard 1037C and from MIL-STD-188

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