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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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546 news items

 
PR Newswire UK (press release)
Mon, 22 Dec 2014 00:03:45 -0800

"To ensure optimum respiratory care and a reduction in asynchrony, ventilators must be safe, effective, easy to apply and adapt to a patients' changing condition," commented Professor F. Javier Belda, Head of the Department of Anesthesia and Critical ...

SDTimes.com

SDTimes.com
Thu, 18 Dec 2014 10:22:30 -0800

In its second official revision since Google's Dart Web development language was standardized by Ecma, the language added support for enumeration, asynchrony and deferred loading. Further details about the feature additions in the second Ecma revision ...
 
PR Newswire (press release)
Wed, 10 Sep 2014 08:45:00 -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 ...

St. Louis Business Journal (blog)

St. Louis Business Journal (blog)
Wed, 03 Dec 2014 08:48:14 -0800

Meanwhile, Peter Witonsky, president of Asynchrony Mobile, said he's looking to raise a Series A round from investors — somewhere in the neighborhood of $2 million to $5 million — to enable the company to spin out from its parent Asynchrony and ...

EE Times

EE Times
Mon, 24 Nov 2014 11:59:15 -0800

... medical, and other consumer devices need interface text that are optimized for "quick-glance recognition." For example, MIT AgeLab and Monotype conducted research earlier this year utilized a new methodology called Stimulus Onset Asynchrony (SOA), ...
 
PR Web (press release)
Thu, 17 Jul 2014 04:27:04 -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 ...
 
Finanzen.net
Mon, 22 Dec 2014 00:26:15 -0800

1. Bitando et al. Patient-ventilator asynchrony during conventional or automated pressure support ventilation in difficult-to-wean patients. Critical Care 2012, 16(Suppl 1): S.126. 2. Carteaux et al. Patient-Ventilator Asynchrony During Noninvasive ...
 
Bolsamania.com
Mon, 22 Dec 2014 00:15:00 -0800

Royal Philips (NYSE: PHG, AEX: PHIA) ha anunciado hoy el lanzamiento europeo del ventilador V680 para el cuidado respiratorio hospitalario, ofreciendo ventilación invasiva y no invasiva. La solución está diseñada para una transición sin fisuras de ...
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