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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.


External links[edit]

Original courtesy of Wikipedia: http://en.wikipedia.org/wiki/Asynchrony — Please support Wikipedia.
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294 news items

Fri, 29 May 2015 06:03:25 -0700

As a result, patient-ventilator asynchrony, defined as a mismatch between patient's inspiratory time and the ventilator insufflation time, may occur in nearly 25 per cent of intubated patients.1 These high rates of asynchrony can be associated with a ...

Huffington Post

Huffington Post
Wed, 27 May 2015 21:07:30 -0700

Psychologist and MacArthur Fellow Howard Gardner and his collaborators have labeled this "fruitful asynchrony" and identify it as a precursor to exceptional creativity. Liberal arts colleges probably tolerate asynchrony more than other institutions ...

St. Louis Business Journal (blog)

St. Louis Business Journal (blog)
Mon, 18 May 2015 07:25:28 -0700

A Mother-Daughter Conversation on Entrepreneurship: 11:30 a.m. to 1 p.m. at St. Louis Regional Chamber, 211 N. Broadway, Suite 1300. Laura and Lauren Herring, of the IMPACT Group, will talk about their experiences as entrepreneurs. Kasey Joyce Grelle ...
PR Newswire (press release)
Wed, 10 Sep 2014 08:50:03 -0700

ST. LOUIS, Sept. 10, 2014 /PRNewswire/ -- Asynchrony, a division of Schafer, is happy to announce the release of Krypdox, an enterprise wide, ultra-secure mobile file distribution solution. Unlike typical peer-to-peer file sharing solutions, Krypdox's ...

Business Wire

Business Wire
Fri, 29 May 2015 05:56:15 -0700

Découvrez Philips Respironics V680, la manière simple, avancé cliniquement pour fournir à vos patients avec fiable, ventilation haute performance à travers le continuum de soins. (Photo: Business Wire) ...
PR Web (press release)
Thu, 17 Jul 2014 04:26:15 -0700

Asynchrony, a division of Schafer Corporation, and lead contractor for the Defense Threat Reduction Agency (DTRA) on the Mobile Field Kit (MFK) software, provided an updated release to National Guard Civil Support Teams (CSTs) to assist in the security ...
Fri, 12 Oct 2012 11:11:41 -0700

Asynchrony Solutions, a growing software developer, has moved across downtown St. Louis to occupy two floors at Cupples 9, which is part of the historic old warehouse district near Busch Stadium. Koman Group, of Creve Coeur, is near completion of a $30 ...
St. Louis Business Journal (blog)
Tue, 26 Feb 2013 09:31:25 -0800

St. Louis software developer Asynchrony Solutions has received $3 million in funding from its parent company, Schafer Corporation, to fund Ionic Mobile, its growing mobile development unit. Asynchrony will use the money for "accelerated development of ...

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