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Asynchrony
 
 
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Asynchrony, in the general meaning, is the state of not being synchronized
Synchronization

Synchronization or synchronisation is timekeeping which requires the coordination of events to operate a system in unison. The familiar Conducting of an orchestra serves to keep the orchestra in time....
.

In specific terms of digital logic and physical layer
Physical layer

The Physical Layer is the first and lowest layer in the seven-layer OSI model of computer networking.The Physical Layer comprises the basic hardware transmission technologies of a network....
 of communication, an asynchronous process does not require a clock signal
Clock signal

In electronics and especially Synchronous logic digital circuits, a clock signal is a Signalling used to coordinate the actions of two or more Electronic circuit....
. Contrast with plesiochronous
Plesiochronous

The term Plesiochronous is derived from the Greek plesio, meaning near, and chronos, time, and refers to the fact that plesiochronous systems run in a state where different parts of the system are almost, but not quite perfectly, synchronization....
 systems.

At the higher data link layer
Data link layer

The Data Link Layer is layer 2 of the seven-layer OSI model of computer networking.The Data Link Layer is the protocol layer which transfers data between adjacent network nodes in a wide area network or between nodes on the same local area network network segment....
 of communication, asynchrony is synonym of statistical multiplexing
Statistical multiplexing

Statistical multiplexing is a type of communication link sharing, very similar to Dynamic bandwidth allocation . In statistical multiplexing, a communication channel is divided into an arbitrary number of variable bit-rate digital channels or data streams....
, 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.






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Encyclopedia


Asynchrony, in the general meaning, is the state of not being synchronized
Synchronization

Synchronization or synchronisation is timekeeping which requires the coordination of events to operate a system in unison. The familiar Conducting of an orchestra serves to keep the orchestra in time....
.
  • Asynchronous learning
    Asynchronous learning

    Asynchronous learning is 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
    Collaborative editing

    Collaborative editing is usually the practice of groups producing works together through individual contributions. Most usually it is applied to textual documents or programmatic source code....
     systems


In specific terms of digital logic and physical layer
Physical layer

The Physical Layer is the first and lowest layer in the seven-layer OSI model of computer networking.The Physical Layer comprises the basic hardware transmission technologies of a network....
 of communication, an asynchronous process does not require a clock signal
Clock signal

In electronics and especially Synchronous logic digital circuits, a clock signal is a Signalling used to coordinate the actions of two or more Electronic circuit....
. Contrast with plesiochronous
Plesiochronous

The term Plesiochronous is derived from the Greek plesio, meaning near, and chronos, time, and refers to the fact that plesiochronous systems run in a state where different parts of the system are almost, but not quite perfectly, synchronization....
 systems.
  • Asynchronous circuit
    Asynchronous circuit

    An asynchronous circuit is a electrical network in which the parts are largely autonomous. They are not governed by a clock circuit or global clock signal, but instead need only wait for the signals that indicate completion of instructions and operations....
  • Asynchronous system
  • Asynchronous serial communication
    • Asynchronous serial interfaces
  • Asynchronous Cellular Automaton
    Asynchronous cellular automaton

    Cellular automata, as with other multi-agent system models, usually treat time as discrete time and finite state machine updates as occurring synchronous system....


At the higher data link layer
Data link layer

The Data Link Layer is layer 2 of the seven-layer OSI model of computer networking.The Data Link Layer is the protocol layer which transfers data between adjacent network nodes in a wide area network or between nodes on the same local area network network segment....
 of communication, asynchrony is synonym of statistical multiplexing
Statistical multiplexing

Statistical multiplexing is a type of communication link sharing, very similar to Dynamic bandwidth allocation . In statistical multiplexing, a communication channel is divided into an arbitrary number of variable bit-rate digital channels or data streams....
, 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
Physical layer

The Physical Layer is the first and lowest layer in the seven-layer OSI model of computer networking.The Physical Layer comprises the basic hardware transmission technologies of a network....
, while being asynchronous at the data link layer
Data link layer

The Data Link Layer is layer 2 of the seven-layer OSI model of computer networking.The Data Link Layer is the protocol layer which transfers data between adjacent network nodes in a wide area network or between nodes on the same local area network network segment....
.
  • Asynchronous Transfer Mode
    Asynchronous Transfer Mode

    Asynchronous Transfer Mode is an electronic digital data transmission technology. ATM is implemented as a network protocol and was first developed in the mid 1980s....
  • Packet switched systems such as Ethernet
    Ethernet

    Ethernet is a family of Data frame-based computer networking technologies for local area networks . The name comes from the physical concept of the Luminiferous aether....
     or IP
    Internet protocol

    Internet protocol may refer to:*The Internet Protocol, a specific protocol implementation in the Internet protocol suite*The Internet protocol suite, a set of communications protocols that are used for the Internet...


In 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.
  • Asynchronous I/O
    Asynchronous I/O

    Asynchronous I/O, or non-blocking I/O, is a form of input/output processing that permits other processing to continue before the transmission has finished....
  • Asynchronous application programming interface
    Application programming interface

    An application programming interface is a set of subroutine, data structures, class and/or Protocol provided by library and/or operating system Service s in order to support the building of applications....
    s (APIs)
  • Asynchronous Method Dispatch
    Asynchronous method dispatch

    Asynchronous method dispatch is a data communication method used when there is a need for the server side to handle a large number of long lasting client requests....
     (AMD)
  • Ajax
    Ajax (programming)

    Ajax, or AJAX , is a group of interrelated web development techniques used to create interactive web applications or rich Internet applications....
    , asynchronous JavaScript
    JavaScript

    JavaScript is a scripting language widely used for client-side web development. It was the originating Programming language dialect of the ECMAScript standard....
     and XML


See also

  • Synchronicity (disambiguation)
    Synchronicity (disambiguation)

    Synchronicity or synchronous can refer to the following meanings:*synchronization, the coordination of events to operate a system in unison....
  • Plesiochronous
    Plesiochronous

    The term Plesiochronous is derived from the Greek plesio, meaning near, and chronos, time, and refers to the fact that plesiochronous systems run in a state where different parts of the system are almost, but not quite perfectly, synchronization....
     or almost synchronous systems
  • Isochronous
    Isochronous

    Isochronous : From Greek iso, equal + chronos, time. It literally means to occur at the same time or at equal time intervals. The term is used in different technical contexts....
     versus anisochronous
    Anisochronous

    In telecommunication, the term anisochronous refers to a periodic signaling , pertaining to transmission in which the time interval separating any two corresponding transitions is not necessarily related to the time interval separating any other two transitions....


External references