Asynchronous communications system
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In telecommunication, an asynchronous communications system (start-stop system) is a data communications system that uses asynchronous operation.
- 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.
Source: from Federal Standard 1037C and from MIL-STD-188