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Error in Definition
I noticed an error on this page in regards to the description in the Bandwidth disambiguation page. According to the Bandwidth list, "Bandwidth (computing): a rate of data transfer, or bit rate, measured in bits per second". However, on this page it is noted, "It should also be distinguished from "data transfer", which is the quantity of data transferred over a given period of time." If this bandwidth is a rate of data transfer in bits per second, then the line in the article saying that bandwidth should be distinguished from data transfer is inaccurate, or misleading.
THIS ARTICLE IS WRONG!!!
Bandwidth is commonly used to refer to bit rate in computing, but this is technically WRONG! Bandwidth is the size of the frequency range used for a signal and THAT'S IT. This article reads as though the technical definition of "bandwidth" is different when used in the context of computing. Textbooks refer to bit rate or throughput, because THESE ARE TECHNICALLY THE CORRECT TERMS AND BANDWIDTH ISN'T!!! More wikipedia ignorance spreading. —Preceding unsigned comment added by 22.214.171.124 (talk) 02:31, 17 September 2010 (UTC)
- I don't like the sloppy use of the bandwidth term, but it does not matter what you or I like, this is how it is used since at least 20 year ago. Also as engineers, we must sometimes accept language filled with abstract metaphores. If we have objections, we should contact the textbook authors; don't blame Wikipedia. Wikipedia must reflect established standards in textbooks and other authorative sources.
- I have now added sources from five famous textbooks used in computer network university classes all over the world. I would be happy if you could find a single counter example - a textbook in Computer networking that never measures bandwidth in bit/s. In telecom, electronics and wireless communications however, bandwidth is typically still measured in Hertz.
The article is indeed wrong. For example how can one then explain 'Spectral Efficiency', which is used as a measure of the bit-rate that can be transmitted over a given bandwidth, with units of 'bits/s per Hertz', or (bit/s)/Hz, or usually bits/s/Hz. Wikipedia can explain that IT people erroneously/colloquailly (and confusingly for the learner) refer to bit-rate as bandwidth, but it's an informal use of the word. From a consumer's point of view, if they install more (similar) communication lines from the supplier, then they are in a sense getting more data through (more bit-rate) and in a sense "putting in more bandwidth" (but NOT PER line...and each line will use the same part of the frequency spectum - the same band of frequencies). Now, they are just getting more in the way they would get more refrigeration capacity if they bought more fridges, and if they wanted that large refrigeration capacity all in one big fridge, then the fridgeration-system design would be quite different, and to explain the design of the latter one would use fundamental scientific/engineering concepts, and one should also do that when explaining bandwidth and bit-rate. Look at (Hartley-) Shannon's Capacity Theorem, and look at its limits as the bandwidth tends to infinity. —Preceding unsigned comment added by 126.96.36.199 (talk) 19:01, 20 April 2011 (UTC)
I have added a few words in the introduction to help clarify the concept for the beginner. I explained how (in computer networking) the word bandwidth is used in a colloquail non-scientific way to refer to the scientific term bit-rate. — Preceding unsigned comment added by 188.8.131.52 (talk) 13:55, 30 March 2012 (UTC)
- I have edited to remove original research. It has been clearly demonstrated by the new refs that bandwidth is used in the sense described. It has not been demonstrated that this use is considered WRONG. Please find some actual references before restoring any of this POV. --Kvng (talk) 14:06, 11 July 2012 (UTC)
- Please read again my earlier paragraph, where I explain the difference very clearly, and I also give an analogy from refrigeration ("..For example how can one then explain 'Spectral Efficiency', which is used as a measure of the bit-rate that can be transmitted over a given bandwidth.."). Concepts should not be made any more difficult for the learner by mixing up terminology from one parameter/concept to another. The width of a band of frequencies is where the word 'bandwidth' comes from, it's as simple as that. The word is unscientifically used by some computer people, but an encyclopedia should explain the scientific term and idea, especially when it's so important, for example in a very famous equation involving it (bandwidth) and the thing you are confusing it with (bit rate). This is the Hartley-Shannon Capacity theorem (some believe it to be one of the most important equations of the 20th century), C = B.Log(base2)[1+S/N] (C = Channel Capacity; B=Bandwidth; S/N = Signal-to-Noise ratio). I suggest you re-phrase it or change it back, because the brief mention of the link to Hartley's work is not sufficient to explain the concept. — Preceding unsigned comment added by 184.108.40.206 (talk) 18:48, 9 October 2012 (UTC)
- I have reverted user:Electron9's insertion of misnomer into the lead. Please read my comment immediately above and discuss here before restoring again. ---—Kvng 23:12, 18 September 2012 (UTC)
You really should differentiate between “data (transfer) rate” and “bandwidth”. The usage of “bandwidth” as a (totally superfluous in also totally wrong) re-definition of “data rate” is just due to marketing and politics idiots with a lack of the required technical knowledge. Below  I have linked a reliable source with an in-depth explanation of the differences. Wikipedia furthermore shouldn’t state how terms are used (by amateurs), but rather clarify the terms in a correct way, as the first variant just leads to the downfall of quality. German wikipedia [2, 3] by the way handles this in a correct manner, clarifying this at the very top of both pages (with each forward ing you to the correct one). Please trust German engineering and also split this up and rename this article to “data (transmission) rate”.  http://mason.gmu.edu/%7Ermorika2/Noise__Data_Rate_and_Frequency_Bandwidth.htm  https://de.wikipedia.org/wiki/Bandbreite  https://de.wikipedia.org/wiki/Daten%C3%BCbertragungsrate Zykløn (talk) 18:53, 3 January 2018 (UTC)
Theoretical "Perfect" Bandwidth
I imagine there might be a theoretical bandwidth which would provide the perfect digital media and communications experience for a single domestic or small business user. This could be described as a perfect point beyond which any further bandwidth would be superfluous. An account of bandwidth seems as incomplete without a definintion of this perfect point, as an account of geography might be without a mention of the size and circumferance of the Earth. Has anyone calculated the point at which all the dreams of a internet user might be acheived ? Collateral to this would be a timeframe when this might be acheived in developed countries and finally for the whole world. — Preceding unsigned comment added by 220.127.116.11 (talk) 21:04, 19 September 2011 (UTC)
Asymptotic bandwidth merge proposal
- If it should be merged (which I am not sure on that it should), I would prefer network throughput or Measuring network throughput articles. Bandwdth is a sloppy term, throughput is more well-defined. Mange01 (talk) 21:00, 14 February 2013 (UTC)
Bandwidth and bit-rate
There is alot of confusing between two terms , the term Bandwidth used more frequency for commercials purposes and specially for networks/wireless hardware , and much more to assume network data speed . While bit-rate are purely computer term used to calculation data speed of the smaller bit in second , and the more accurate to use . The different between two terms ,bandwidth often reference to network and data transfer of external PC units , while bit-rate are more generic and used calculate all data transfer of an internal or external unit e.g data transfer between CPU and cache unit . Secondly bandwidth can calculated using Bit per second or Byte per second , while bit-rate calculated only on bits .--Salem F (talk) 10:39, 4 November 2015 (UTC)