Available line

Available line

In voice, video, or data communications, the term available line (or useful line or in service) is a circuit between two points that is ready for service, but is in the idle state. Antonyms include "busy line", "unavailable", "engaged", and "out of service".

In facsimile transmission, it is the portion of the scan line that can be specifically used for image signals.

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


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