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'''चौड़ी तरंग-पट्टी''' या '''ब्रॉडबैँड''' [[दूरसंचार]] में एक पद है जो कि उस पद्धति से संदर्भ रखता है जिसमे संकेत भेजने के लिये चौड़ी(ज्यादा) या काई [[आवृत्ति|आवृत्तियों]] का प्रयोग होता है जो कि कई मार्गों या ''आवृत्ति भण्डार'' मे विभाजित हों.
{{अनुवाद}}
'''चौड़ी तरंग-पट्टी''' या '''ब्रॉडबैँड''' in [[telecommunications]] is a term which refers to a signaling method which includes or handles a relatively wide range of [[frequency|frequencies]] which may be divided into channels or ''frequency bins''. ''Broadband'' is always a [[relative term]], understood according to its context. The wider the [[bandwidth]], greater is the information carrying capacity. In [[radio]], for example, a very narrow-band signal will carry [[Morse code]]; a broader band will carry speech; a still broader band is required to carry [[music]] without losing the high [[Audio frequency|audio frequencies]] required for realistic [[sound reproduction]]. A [[television]] antenna described as "normal" may be capable of receiving a certain range of channels; one described as "broadband" will receive more channels. In data communications a [[modem]] will transmit a bandwidth of 64 kilobits per seconds (kbit/s) over a [[telephone line]]; over the same telephone line a bandwidth of several megabits per second can be handled by [[ADSL]], which is described as ''broadband'' (relative to a modem over a telephone line, although much less than can be achieved over a [[fibre optic]] circuit, for example).
==Introduction==
'''Broadband''' in [[data communications]] may have the same meaning as above, so that [[data transmission]] over a [[fiber optic]] cable would be referred to as broadband as compared to a [[modem|telephone modem]] operating at 600 [[Bitrate|bits per second]].
However, '''broadband''' in [[data communications]] is frequently used in a more technical sense to refer to data transmission where multiple pieces of data are sent simultaneously to increase the effective rate of transmission, regardless of actual [[Data signaling rate|data rate]]. In [[network engineering]] this term is used for methods where two or more signals share a medium.
Various forms of [[Digital Subscriber Line]](DSL) services are broadband in the sense that digital information is sent over one channel and voice over another channel sharing a single pair of wires. Analog modems operating at speeds greater than 600 bit/s are technically broadband. They obtain higher effective transmission rates by using multiple channels with the rate on each channel limited to 600 [[baud]]. For example, a 2400 bit/s modem uses four 600 baud channels (see [[baud]]). This is in contrast to a [[baseband]] transmission where one type of signal uses a medium's full bandwidth such as [[100BASE-T]] [[Ethernet]].
==Multiplexing==
Communications may utilize a number of distinct physical channels simultaneously; this is [[multiplexing]] for [[multiple access]]. Such channels may be distinguished by being separated from each other in time ([[Time-division multiplexing|time division multiplexing]] or [[Time division multiple access|TDMA]]), in [[carrier frequency]] ([[frequency division multiplexing]] ([[FDMA]]) or [[wavelength division multiplexing]] (WDM)), or in [[access method]] ([[code division multiple access]] or [[Code division multiple access|CDMA]]). Each channel that takes part in such a multiplexing exercise is by definition narrowband (because it is not utilising the whole bandwidth of the medium), whereas the whole set of channels taken together and utilized for the same communication could be described as broadband.
==External links==
* [http://www.broadband.co.uk Independent site providing advice on Broadband]
* [http://www.broadband-finder.co.uk/news/ Broadband News - Broadband Finder]
* [http://www.uk-bug.net UK Broadband Usergroup]
* [http://www.thinkbroadband.com Thinkbroadband] UK guide to broadband
* [http://www.cybertelecom.org/data/broadband.htm US statistics on broadband subscribership]
* [http://www.euractiv.com/en/infosociety/eu-broadband-policy/article-117450 EU Broadband policy: EurActiv]
* [http://www.broadbandguide.com.au Australian Broadband Guide, tools, resources and advice on AU internet providers]
* [http://www.onlinereview.org.uk/article/Free-Broadband-Offers.htm A Review of the free UK broadband market]
* [http://broadband.t5.co.nz T5 Broadband Guide New Zealand]
[[Category:Broadband| ]]
[[श्रेणी:चौड़ी तरंग-पट्टी| ]]
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