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Asynchrony, in the general meaning, is the state of not being synchronized.

  • 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

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 plesiochronous systems.

  • Asynchronous circuit, is a sequential digital logic circuit which is not governed by a clock circuit or global clock signal
  • Asynchronous system, has no global clock: instead, it operates under distributed control, with concurrent hardware components communicating and synchronizing on channels
  • 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
  • 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 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 data link layer of communication, asynchrony is synonym of statistical multiplexing. 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 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
  • 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]

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.

References[edit]

External links[edit]


Original courtesy of Wikipedia: http://en.wikipedia.org/wiki/Asynchrony — Please support Wikipedia.
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Texas A&M University

Texas A&M University
Wed, 08 Oct 2014 08:03:59 -0700

In this project the team will develop novel exascale numerical schemes for PDEs, especially those describing turbulent flows, that exploit asynchrony from the mathematical to the software level. These will be based on widely used finite differences ...
 
Area Development Online
Wed, 15 Oct 2014 11:53:39 -0700

It is that asynchrony, as much as any single cause, that has resulted in the “skills gap” that so occupies the conversations of CEOs and corporate hiring managers, particularly at manufacturing firms, says a new Georgetown University study (Failure to ...
 
Mother Earth News
Wed, 08 Oct 2014 13:03:45 -0700

The polite term for this temporal mismatch is asynchrony, but the colloquial expression is getting stood up! There is growing evidence that many pollinators and plants are being triggered into earlier but not necessarily synchronous activity by the ...

CIDRAP

CIDRAP
Fri, 26 Sep 2014 16:03:45 -0700

... of what is taking place and when to intervene. "The intervals are flexible enough to accommodate the likely asynchrony of pandemic progression in different areas to allow for local, state, and federal actions appropriate to jurisdiction-specific ...

ExtremeTech

ExtremeTech
Thu, 25 Sep 2014 10:15:00 -0700

... unison to lift the creature in synchronous defiance of gravity. Capturing the conversion point from asynchrony to synchrony would be the ideal milestone to mark our our accomplishment, and the foundation on which to build a more nuanced control ...
 
ADT Magazine
Tue, 30 Sep 2014 10:48:45 -0700

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Fri, 19 Sep 2014 10:19:59 -0700

Bonfyre, the St. Louis startup that developed one of the hottest social media apps, has launched an enterprise-level feature for bigger companies. Tom Foremski, a Silicon Valley blogger, writes about the spirit of St. Louis startups following Southwest ...
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