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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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395 news items

EE Times

EE Times
Mon, 24 Nov 2014 11:30:00 -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), ...
 
CircleID
Thu, 20 Nov 2014 16:56:15 -0800

Success in DNS telemetry has historically come from the PCAP/BPF approach, where the collection agent reassembles packets seen 'on the wire' into DNS transaction records, with complete asynchrony from the DNS server itself. It is literally and always ...
 
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)
Thu, 06 Nov 2014 09:35:27 -0800

Executives from Emerson, Panera, First Bank and Asynchrony participated in St. Louis' first Mobile App Summit this morning, hosted by the Business Journal. The panel, moderated by Asynchrony Director of Mobility Matt Sebek, discussed ways in which ...
 
DigitalJournal.com
Sun, 23 Nov 2014 23:52:30 -0800

These include software development, demand for facial masks, trend of home ventilation and non-invasive ventilators, and increasing focus by ventilator companies of developing multimodal ventilators to prevent incidences of asynchrony and leg injury.
 
St. Louis Business Journal (blog)
Thu, 06 Nov 2014 07:00:27 -0800

Executives from Emerson, Panera, First Bank and Asynchrony participated in St. Louis' first Mobile App Summit this morning, hosted by the Business Journal. Once considered unthinkable, Microsoft just said it will give away for free its Office suite of ...
 
InfoQ.com
Mon, 03 Nov 2014 02:28:55 -0800

Matthew: One thing that we've done at Asynchrony is to simply educate our teams and leaders on what Kanban is, especially the "why" behind why we like Kanban. We've starting that through the values-based Depth-of-Kanban assessments that Mike ...
 
BioPrepWatch
Thu, 24 Jul 2014 08:33:42 -0700

Asynchrony, an information technology consulting firm, recently announced that it provided an updated release of its mobile field kit (MFK) software to National Guard Civil Support Teams (CSTs) to help with July 4 events. The MFK has been deployed by ...
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