Asynchronous Communications System

• In an asynchronous communications system, extra signal elements are usually appended to the data for the purpose of synchronizing individual data characters or blocks.
• The time spacing between successive data characters or blocks may be of arbitrary duration.

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aeronautical emergency communications system plan aiod leads airborne radio relay air ground worldwide communications system alarm sensor a law algorithm allan variance alphanumeric alternate party ambient noise level amplitude distortion	analog decoding angular misalignment loss antenna blind cone antenna effective area antenna height above average terrain antenna noise temperature aperture to medium coupling loss apparent power area broadcast shift arithmetic overflow arithmetic shift	arq articulation score artificial transmission line associative storage asynchronous operation atmospheric duct 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