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Bandwidth (computing)
In computing, bandwidth is the bit-rate of available or consumed information capacity expressed typically in metric multiples of bits per second. Variously, bandwidth may be characterized as network bandwidth,〔Douglas Comer, (Computer Networks and Internets ), page 99 ff, Prentice Hall 2008.〕 data bandwidth,〔Fred Halsall, (Introduction to data communications and computer networks ), page 108, Addison-Wesley, 1985.〕 or digital bandwidth.〔(Cisco Networking Academy Program: CCNA 1 and 2 companion guide, Volym 1–2 ), Cisco Academy 2003〕〔Behrouz A. Forouzan, ''Data communications and networking'', McGraw-Hill, 2007〕
This definition of ''bandwidth'' is in contrast to the field of signal processing, wireless communications, modem data transmission, digital communications, and electronics, in which ''bandwidth'' is used to refer to analog signal bandwidth measured in hertz, meaning the frequency range between lowest and highest attainable frequency while meeting a well-defined impairment level in signal power.
However, the actual bit rate that can be achieved depends not only on the signal bandwidth, but also on the noise on the channel.
==Network bandwidth capacity==
The term ''bandwidth'' sometimes defines the net bit rate (aka. ''peak bit rate'', ''information rate,'' or physical layer ''useful bit rate''), channel capacity, or the maximum throughput of a logical or physical communication path in a digital communication system. For example, bandwidth tests measure the maximum throughput of a computer network. The maximum rate that can be sustained on a link are limited by the Shannon-Hartley channel capacity for these communication systems, which is dependent on the bandwidth in hertz and the noise on the channel.
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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