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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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362 news items


Tue, 30 Jun 2015 11:27:03 -0700

Top executives of both companies met recently with CRN to discuss the acquisition early this month by World Wide Technology, commonly known as WWT, of Asynchrony for an undisclosed sum. WWT, which has partnered with Asynchrony on a number of ...

St. Louis Public Radio

St. Louis Public Radio
Fri, 05 Jun 2015 11:56:15 -0700

Strunk says Asynchrony will now allow them to offer solutions to customers, from the underlying infrastructure to the user-facing software. WWT bought Asynchrony for an undisclosed amount from Virginia-based Schafer Corporation. That company had ...
Mon, 08 Jun 2015 11:22:30 -0700

World Wide Technology is moving to add custom application development to its traditional data center infrastructure integration with the acquisition of Asynchrony. St. Louis-based World Wide Technology, better known as WWT, is renaming the organization ...


Sat, 13 Jun 2015 22:15:00 -0700

Its acquisition this month of St. Louis-based Asynchrony added another 250 employees who bring software and mobile app development expertise to the company's suite of services. The company will use that firm to develop programs its customers can use to ...

UMSL Daily (blog)

UMSL Daily (blog)
Mon, 29 Jun 2015 02:45:00 -0700

Computer science graduate student Eryn Cantrell works in his local coffee shop on his iOS game app, which helped land him his summer internship at the application and mobile development company Asynchrony in St. Louis. (Photo by August Jennewein).
Tue, 30 Jun 2015 19:26:15 -0700

The most prominent issue facing the industry today is that resource consumption needs to be controlled such that a fast data source does not overwhelm the stream destination. Asynchrony is needed in order to enable the parallel use of computing ...

Atlanta Journal Constitution (blog)

Atlanta Journal Constitution (blog)
Wed, 24 Jun 2015 09:30:22 -0700

Climate change can also cause trophic asynchrony when many species of migratory songbirds have been documented returning to their breeding grounds and nesting earlier in the season as the climate continues to warm. The timing of peak bird nesting, ...
Computerworld India
Fri, 19 Jun 2015 11:00:00 -0700

"When developers have the tools to understand and express asynchrony better, they write lower-latency services that are easier to maintain," he wrote. Facebook's Instagram service also uses the farmework, to improve performance and reduce the number of ...

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