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Available line

In telecommunication, the term available line has the following meanings:

1. In voice, video, or data communications, a circuit between two points that is ready for service, but is in the idle state[?].

2. In facsimile transmission, the portion of the scanning line[?] that can be specifically used for image signals. Synonym useful line.

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

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