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propagation delay
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. It can be computed as the ratio between the link length and the propagation speed over the specific medium.
Propagation delay is equal to ''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 wire, the speed ''s'' generally ranges from .59c to .77c.〔(【引用サイトリンク】 title=Propagation Delay and Its Relationship to Maximum Cable Length )〕 This delay is the major obstacle in the development of high-speed computers and is called the interconnect bottleneck in IC systems.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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