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asynchronous

   Also found in: Dictionary/thesaurus, Medical, Acronyms, Wikipedia, Hutchinson 0.01 sec.

Refers to events that are not synchronized, or coordinated, in time. The following are considered asynchronous operations. The interval between transmitting A and B is not the same as between B and C. The ability to initiate a transmission at either end. The ability to store and forward messages. Starting the next operation before the current one is completed. Contrast with synchronous.

(architecture)asynchronous - Not synchronised by a shared signal such as clock or semaphore, proceeding independently.

Opposite: synchronous.

1. A process in a multitasking system whose execution can proceed independently, "in the background". Other processes may be started before the asynchronous process has finished.

2. A communications system in which data transmission may start at any time and is indicated by a start bit, e.g. EIA-232. A data byte (or other element defined by the protocol) ends with a stop bit. A continuous marking condition (identical to stop bits but not quantized in time), is then maintained until data resumes.


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Real-time, or immediate, replication can be either synchronous (data is written to both storage devices at the same time, and the write operation isn't complete until both devices have completed writing) or asynchronous (data is written to both storage devices at once, although the write operation is considered complete when the primary storage device has completed writing).
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