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Reference.org
Comparison of synchronous and asynchronous signalling
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<p>Synchronous and asynchronous transmissions are two different methods of <a href="/facts/Data_transmission/1yAhaANd">transmission</a> <a href="/facts/Synchronization/L39sYwbr">synchronization</a>. Synchronous transmissions are synchronized by an external clock, while asynchronous transmissions are synchronized by special signals along the transmission medium. </p>