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Created page with 'File:lighterstill.jpgright|frame ==Origin== [http://nordan.daynal.org/wiki/index.php?title=English#ca._1100-1500_.09THE_MIDDLE_ENGLISH_PERIOD Middle Engl...'
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==Origin==
[http://nordan.daynal.org/wiki/index.php?title=English#ca._1100-1500_.09THE_MIDDLE_ENGLISH_PERIOD Middle English], from Anglo-French delaier, from de- + laier to leave, from lai-, [[present]] and [[future]] stem of lesser, laisser to leave, from [[Latin]] laxare to slacken, from laxus loose
*[http://en.wikipedia.org/wiki/14th_century 14th Century]
==Definitions==
*1: put off, postpone <delay a departure>
*2: to stop, detain, or hinder for a [[time]] <the mails were delayed by heavy snows>
*3: to [[cause]] to be slower or to occur more slowly than [[normal]] <delay a child's [[development]]>
==Description==
Propagation '''delay''' is a technical term that can have a [[different]] [[meaning]] depending on the [[context]]. It can relate to networking, electronics or [[physics]]. In general it is the length of time taken for the [[quantity]] of interest to reach its destination.
==Networking==
In [http://en.wikipedia.org/wiki/Computer_network computer networks], propagation delay is the amount of time it takes for the head of the [[signal]] to travel from the sender to the receiver over a [[medium]]. It can be computed as the [[ratio]] between the link length and the propagation [[speed]] over the specific medium.
Propagation delay = d/s where d is the distance and s is the [http://en.wikipedia.org/wiki/Wave_propagation_speed wave propagation speed]. In wireless communication, s=c, i.e. the [[speed of light]]. In copper wires, the speed s is typically about 67% av of speed of light. This delay is the major obstacle in the [[development]] of high-speed computers and called [http://en.wikipedia.org/wiki/Interconnect_bottleneck interconnect bottleneck] in IC systems.
==Physics==
In [[physics]], particularly in the [[electromagnetism]] field, the propagation delay is the length of time it takes for a [[signal]] to [[travel]] to its destination. For example, in the case of an electric signal, it is the time taken for the signal to travel through a wire. See also, [http://en.wikipedia.org/wiki/Velocity_of_propagation velocity of propagation].[http://en.wikipedia.org/wiki/Propagation_delay]
[[Category: Physics]]
==Origin==
[http://nordan.daynal.org/wiki/index.php?title=English#ca._1100-1500_.09THE_MIDDLE_ENGLISH_PERIOD Middle English], from Anglo-French delaier, from de- + laier to leave, from lai-, [[present]] and [[future]] stem of lesser, laisser to leave, from [[Latin]] laxare to slacken, from laxus loose
*[http://en.wikipedia.org/wiki/14th_century 14th Century]
==Definitions==
*1: put off, postpone <delay a departure>
*2: to stop, detain, or hinder for a [[time]] <the mails were delayed by heavy snows>
*3: to [[cause]] to be slower or to occur more slowly than [[normal]] <delay a child's [[development]]>
==Description==
Propagation '''delay''' is a technical term that can have a [[different]] [[meaning]] depending on the [[context]]. It can relate to networking, electronics or [[physics]]. In general it is the length of time taken for the [[quantity]] of interest to reach its destination.
==Networking==
In [http://en.wikipedia.org/wiki/Computer_network computer networks], propagation delay is the amount of time it takes for the head of the [[signal]] to travel from the sender to the receiver over a [[medium]]. It can be computed as the [[ratio]] between the link length and the propagation [[speed]] over the specific medium.
Propagation delay = d/s where d is the distance and s is the [http://en.wikipedia.org/wiki/Wave_propagation_speed wave propagation speed]. In wireless communication, s=c, i.e. the [[speed of light]]. In copper wires, the speed s is typically about 67% av of speed of light. This delay is the major obstacle in the [[development]] of high-speed computers and called [http://en.wikipedia.org/wiki/Interconnect_bottleneck interconnect bottleneck] in IC systems.
==Physics==
In [[physics]], particularly in the [[electromagnetism]] field, the propagation delay is the length of time it takes for a [[signal]] to [[travel]] to its destination. For example, in the case of an electric signal, it is the time taken for the signal to travel through a wire. See also, [http://en.wikipedia.org/wiki/Velocity_of_propagation velocity of propagation].[http://en.wikipedia.org/wiki/Propagation_delay]
[[Category: Physics]]