asynchronous

adj. not simultaneous, not synchronous

Asynchrony, in the general meaning, is the state of not being synchronized.Asynchronous learningCollaborative editing systemsIn specific terms of digital logic and physical layer of communication, an asynchronous process does not require a clock signal. Contrast with plesiochronous systems.Asynchronous circuitAsynchronous systemAsynchronous serial communicationAsynchronous serial interfacesAsynchronous Cellular AutomatonAt the higher data link layer of communication, asynchrony is synonym of statistical multiplexing, such as in packet mode. The information transmission may or may not start immediately as requested by sender, the additional delay being caused by medium congestion. Contrast with example of circuit switched communication, which (once circuit is established) allows immediate start of transfer with a guaranteed bit rate. Confusingly, a communication is often synchronous at the physical layer, while being asynchronous at the data link layer.Asynchronous Transfer ModePacket switched systems such as Ethernet or IP
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Adjective
1. (digital communication) pertaining to a transmission technique that does not require a common clock between the communicating devices; timing signals are derived from special characters in the data stream itself
(antonym) synchronous
2. not synchronous; not occurring or existing at the same time or having the same period or phase
(antonym) synchronous, synchronal, synchronic
(similar) allochronic

<architecture> 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.
(1995-12-08)

asynchronous
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