Difference between revisions of "Delay"
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==Origin== | ==Origin== | ||
[https://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 | [https://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 | ||
| − | *[ | + | *[https://en.wikipedia.org/wiki/14th_century 14th Century] |
==Definitions== | ==Definitions== | ||
*1: put off, postpone <delay a departure> | *1: put off, postpone <delay a departure> | ||
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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. | 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== | ==Networking== | ||
| − | In [ | + | In [https://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 [ | + | Propagation delay = d/s where d is the distance and s is the [https://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 [https://en.wikipedia.org/wiki/Interconnect_bottleneck interconnect bottleneck] in IC systems. |
==Physics== | ==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, [ | + | 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, [https://en.wikipedia.org/wiki/Velocity_of_propagation velocity of propagation].[https://en.wikipedia.org/wiki/Propagation_delay] |
[[Category: Physics]] | [[Category: Physics]] | ||
Latest revision as of 23:42, 12 December 2020
Origin
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
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 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 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 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, velocity of propagation.[1]
