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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, such as in packet mode. 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]


Original courtesy of Wikipedia: http://en.wikipedia.org/wiki/Asynchrony — Please support Wikipedia.
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5 news items

 
InfoQ.com
Mon, 21 Apr 2014 08:56:15 -0700

Asynchrony is required to enable the parallel use of computing resources, and back pressure in needed to make sure the data producer doesn't overwhelm the data consumer and potentially bring down the entire system. Reactive Streams is an engineering ...
 
Computerworld
Tue, 22 Apr 2014 06:52:30 -0700

Dave Elfanbaum is a co-founder at Asynchrony. He is an active participant in the virtual world through his pseudonymous character, Botgirl Questi, and her blog, videos, and social networking/public speaking presence. Read more about Personal Technology ...
 
STLtoday.com
Thu, 03 Apr 2014 22:02:48 -0700

Asynchrony opened an IT consulting office and warehouse: 900 Spruce Street. Suite 700. St. Louis, Mo. 63102. 314-678-2200. PROJECT. The city of Baltimore awarded O'Fallon, Mo.-based SAK Construction LLC an $18.8 million contract to install more than ...
 
Bits Of Science
Wed, 02 Apr 2014 03:27:28 -0700

Increasing asynchrony of the winter moth (Operophtera brumata) and its feeding host oak tree (Quercus robur) in the Netherlands was linked to increasing spring temperatures but unchanging winter temperatures (van Asch and Visser, 2007). Warmer ...
 
Medical Xpress
Wed, 02 Apr 2014 06:20:12 -0700

In the same fold Boklage also discuss asynchrony of cell division, noting that in the first few division cycles only one cell divides at a given time. One could take a look at normal human early cleavage and know that the largest cell remaining will be ...
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