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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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Thu, 04 Jun 2015 18:43:58 -0700

“Our expertise in mobility and application development are an ideal complement to WWT's vast knowledge of systems architecture,” Bob Elfanbaum, co-founder and general manager of Asynchrony, said in a statement. “We're looking forward to working ...


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

Bob Elfanbaum, co-founder and general manager of Asynchrony, told CRN that his company started partnering and doing joint marketing with WWT because of the latter's attractive customer base, one that offered new opportunities beyond its parent ...

HPCwire (blog)

HPCwire (blog)
Mon, 05 Oct 2015 07:26:15 -0700

There is a set of emerging needs that include the ability to handle asynchrony, manage power locally and globally, handle re- liability, provide for over commit of software threads, and interact effectively with runtimes. The classical needs allow ...
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 ...

New Scientist

New Scientist
Wed, 30 Sep 2015 11:00:00 -0700

“Although playing a string instrument also requires fine motor skills and hand coordination, it enforces a strict asynchrony between left-hand and right-hand finger movements.” “It is surprising that the effect is instrument-specific,” says Marcus ...

EE Times

EE Times
Fri, 25 Sep 2015 12:41:15 -0700

... (b) intrinsic de-bounce of the mechanical inputs, (c) automatic conversion of the analog thermistor signal to a 12V PWM fan, and most importantly (d) complete asynchrony between the quadrature input device and the SPI register, which provides not ...


Mon, 14 Sep 2015 02:02:42 -0700

We examined only one condition involving a stimulus onset asynchrony (SOA) between the cue and target to simplify the experimental design. However, previous studies have reported that the attentional shifts based on visual features or intentions can ...

Huffington Post

Huffington Post
Thu, 10 Sep 2015 15:41:15 -0700

Asynchrony is a constant theme. As Guy rushes to meet Geneviève that first night, the last minute customer whom he never sees is Roland Cassard. Geneviève gets pregnant the very first time they have sex. Guy's beloved aunt dies the very night he hits ...

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