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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.

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Original courtesy of Wikipedia: http://en.wikipedia.org/wiki/Asynchrony — Please support Wikipedia.
This page uses Creative Commons Licensed content from Wikipedia. A portion of the proceeds from advertising on Digplanet goes to supporting Wikipedia.

4 news items

 
Federal Times
Tue, 26 Aug 2014 07:11:17 -0700

The troubled launch of healthcare.gov shouldn't have come as a surprise. Multiple studies show that large-scale IT projects are almost never delivered as promised and pose a significant risk of complete failure. A government acquisition process that ...

Modern Farmer

Modern Farmer
Thu, 21 Aug 2014 05:20:34 -0700

... and his colleagues note that for tomatoes it seems to be a complicated combination of factors including carbohydrate build up during continuous photosynthesis and simply throwing off the plants natural circadian rhythms (known as circadian asynchrony).
 
FreshPlaza
Fri, 22 Aug 2014 00:41:15 -0700

... and his colleagues note that for tomatoes it seems to be a complicated combination of factors including carbohydrate build up during continuous photosynthesis and simply throwing off the plants natural circadian rhythms (known as circadian asynchrony).
 
Economic and Political Weekly
Wed, 13 Aug 2014 00:52:19 -0700

... Mani Kaul's films that self-avowedly turned time rather the image into the substance of a non-dramatic, contemplative narration, cinematic duration speaks of the asynchrony upon which aesthetic and political alternatives now show a tendency to ...
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