Bandwidth (computing)

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Bandwidth (computing)

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In computer networking and computer science, bandwidth, network bandwidth, data bandwidth or digital bandwidth, is a bit rate measure of available or consumed data communication resources expressed in bits/second or multiples of it (kilobits/s, megabits/s etc).

Note that in textbooks on data transmission, digital communications, wireless communications, electronics, etc, bandwidth refers to analog signal bandwidth measured in hertz - the original meaning of the term. Some computer networking authors prefer less ambiguous terms such as bit rate, channel capacity and throughput rather than bandwidth in bit/s, to avoid this confusion.

* 1 Network bandwidth capacity
* 2 Network bandwidth consumption
* 3 Multimedia bandwidth
* 4 Bandwidth in web hosting
* 5 Internet connection bandwidths
* 6 See also
* 7 References

[edit] Network bandwidth capacity

In computer networking, bandwidth in bit/s sometimes means the net bit rate (also known as 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 reason for this usage is that according to Hartley's law, the maximum data rate of a physical communication link is proportional to its bandwidth in hertz, which is sometimes called frequency bandwidth, spectral bandwidth, RF bandwidth, signal bandwidth or analog bandwidth.
[edit] Network bandwidth consumption

In computer networking, bandwidth in bit/s may also refer to consumed bandwidth, corresponding to achieved throughput or goodput, i.e., the average rate of successful data transfer through a communication path. This sense applies to expressions such as bandwidth shaping, bandwidth management, bandwidth throttling, bandwidth cap, bandwidth allocation (for example bandwidth allocation protocol and dynamic bandwidth allocation), etc. A bit stream's bandwidth is proportional to the average consumed signal bandwidth in Hertz (the average spectral bandwidth of the analog signal representing the bit stream) during a studied time interval.
[edit] Multimedia bandwidth

Digital bandwidth may also refer to: multimedia bit rate or average bitrate after multimedia data compression (source coding), defined as the total amount of data divided by the playback time.
[edit] Bandwidth in web hosting

In website hosting, the term "bandwidth" is often incorrectly used to describe the amount of data transferred to or from the website or server within a prescribed period of time, for example bandwidth consumption accumulated over a month measured in gigabytes per month. The more accurate phrase used for this meaning of a maximum amount of data transfer each month or given period is monthly data transfer..
[edit] Internet connection bandwidths

This table shows the maximum bandwidth (the physical layer net bitrate of common Internet access technologies). For a more detailed list see list of device bandwidths, bit rate progress trends and list of bitrates in multimedia.
56 Kbit/s Modem / Dialup
1.5 Mbit/s ADSL Lite
1.544 Mbit/s T1
10 Mbit/s Ethernet
11 Mbit/s Wireless 802.11b
44.736 Mbit/s T3
54 Mbit/s Wireless 802.11g
100 Mbit/s Fast Ethernet
155 Mbit/s OC3
300 Mbit/s Wireless 802.11n
622 Mbit/s OC12
1 Gbit/s Gigabit Ethernet
2.5 Gbit/s OC48
9.6 Gbit/s OC192
10 Gbit/s 10 Gigabit Ethernet
100 Gbit/s 100 Gigabit Ethernet
[edit] See also

* 92 Code
* Bandwidth cap
* Bandwidth extension
* Bandwidth optimization
* Bandwidth test
* Bandwidth theft
* Bit rate
* Broadband
* Comparison of latency and throughput
* Goodput
* List of device bandwidths
* Measuring network throughput
* Narrowband
* Signal processing
* Throughput

[edit] References
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