Available Line

• In voice, video, or data communications, a circuit between two points that is ready for service, but is in the idle state.
• In facsimile transmission, the portion of the scanning line that can be specifically used for image signals.

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attack time arj attenuation attenuation constant attenuator attribute audible ringing tone audio response unit audit (telecommunication) audit trail aurora	authenticator automated information system automated information systems security automatic callback automatic call distributor automatic calling automatic data processing automatic data processing equipment automatic link establishment automatic message exchange automatic redial	automatic sounding automatic switching system auxiliary power availability backbone backscattering back to back connection backward channel balanced line balance return loss balancing network	band stop filter bandwidth compression barrage jamming baseband base communications basic exchange telecommunications radio service basic service basic service element basic serving arrangement bch code beam diameter