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[[Image:Asynchronouslogicboard.jpg|right|frame|<center>[http://www.electronicsweekly.com/Articles/2005/09/13/36292/asynchronous-logic-born-to-be-wild.htm asynchronouslogicboard]]]
[[Image:Asynchronouslogicboard.jpg|right|frame|<center>[http://www.electronicsweekly.com/Articles/2005/09/13/36292/asynchronous-logic-born-to-be-wild.htm asynchronouslogicboard]]]
===Adjective===
*[http://en.wikipedia.org/wiki/18th_century 1748]
==Definitions==
*1: not [[synchronous]]; occurring at [[different]] times
# computing: (of a request or a message) allowing the client to continue during a processing [[sequence]].
==Description==
'''Asynchrony''', in the general meaning, is the state of not being [[synchronized]].
*[http://en.wikipedia.org/wiki/Asynchronous_learning Asynchronous learning], a student-centered teaching [[method]] that uses online learning resources to [[facilitate]] information [[sharing]] outside the constraints of time and place among a network of people
*[[Collaborative]] editing systems
[[Category: General Reference]]
In specific terms of ''digital logic'' and physical layer of [[communication]], an asynchronous [[process]] does not require a clock signal, in contrast with synchronous and [http://en.wikipedia.org/wiki/Plesiochronous plesiochronous] systems.
*[http://en.wikipedia.org/wiki/Asynchronous_circuit Asynchronous circuit], is a sequential digitallogic circuit which is not governed by a clock circuit or global clock signal
*[http://en.wikipedia.org/wiki/Asynchronous_system Asynchronous system], has no global clock: instead, it operates under distributed control, with concurrent hardware components communicating and synchronizing on channels
*[http://en.wikipedia.org/wiki/Asynchronous_serial_communication Asynchronous communication], transmission of data without the use of an external clock signal, where data can be transmitted intermittently rather than in a steady stream
*[http://en.wikipedia.org/wiki/Asynchronous_serial_communication Asynchronous serial communication], describes an asynchronous, serial transmission protocol in which a start signal is sent prior to each byte, character or code word and a stop signal is sent after each code word
*Asynchronous [http://en.wikipedia.org/wiki/Serial_interface serial interfaces]
*[http://en.wikipedia.org/wiki/Asynchronous_cellular_automaton Asynchronous cellular automaton], able to update individual [[cells]] independently, in such a way that the new state of a cell affects the [[calculation]] of states in neighbouring cells
At the higher [http://en.wikipedia.org/wiki/Data_link_layer data link layer] of [[communication]], ''asynchrony'' is synonym of [http://en.wikipedia.org/wiki/Statistical_multiplexing statistical multiplexing], such as in [http://en.wikipedia.org/wiki/Packet_mode 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.
*[http://en.wikipedia.org/wiki/Asynchronous_Transfer_Mode Asynchronous Transfer Mode], according to the ATM Forum, "a telecommunications concept defined by ANSI and ITU (formerly CCITT) standards for carriage of a complete range of user traffic, including voice, data, and video signals," and is designed to unify telecommunication and computer networks
*[http://en.wikipedia.org/wiki/Packet_switched Packet switched] systems such as Ethernet or IP
In computer programming, asynchronous events are those occurring independently of the main program flow. Asynchronous actions are actions executed in a non-blocking scheme, allowing the main program flow to continue processing.[1]
*Asynchronous I/O, in [[computer science]], is a form of input/output processing that permits other processing to continue before the transmission has finished
*[http://en.wikipedia.org/wiki/Application_programming_interface Asynchronous application programming] interfaces (APIs)
*[http://en.wikipedia.org/wiki/Asynchronous_method_dispatch Asynchronous method dispatch ]](AMD), a data communication method used when there is a need for the server side to handle a large number of long lasting client requests
*[http://en.wikipedia.org/wiki/Ajax_(programming) Ajax (programming)], asynchronous JavaScript and XML
In electric motors, an asynchronous motor is a variant where the electromagnetic field turns with a different (higher) speed than the rotor; the difference is called slip.[http://en.wikipedia.org/wiki/Asynchronous]
[[Category: Computer Science]]