Editing Broadband (section)

=== Telecommunications ===
In [[telecommunications]], a broadband signalling method is one that handles a wide band of frequencies. "Broadband" is a relative term, understood according to its context. The wider (or broader) the [[Bandwidth (signal processing)|bandwidth]] of a channel, the greater the data-carrying capacity, given the same channel quality.

In [[radio]], for example, a very narrow band will carry [[Morse code]], a broader band will carry speech, and a still broader band will carry [[music]] without losing the high [[Audio frequency |audio frequencies]] required for realistic [[sound reproduction]]. This broad band is often divided into channels or "frequency bins" using [[passband]] techniques to allow [[frequency-division multiplexing]] instead of sending a higher-quality signal.

In data communications, a [[Modem#56&nbsp;kbit/s technologies|56k modem]] will transmit a data rate of 56 kilobits per second (kbit/s) over a 4-kilohertz-wide [[telephone line]] (narrowband or [[voiceband]]). In the late 1980s, the [[Broadband Integrated Services Digital Network]] (B-ISDN) used the term to refer to a broad range of [[bit rate]]s, independent of physical modulation details.<ref name="bisdn">{{cite web |author=Ender Ayanoglu |author2=Nail Akar |title=B-ISDN (Broadband Integrated Services Digital Network) |date=25 May 2002 |url=http://repositories.cdlib.org/cpcc/2/ |publisher=Center for Pervasive Communications and Computing, UC Irvine |access-date=July 12, 2011 |url-status=live |archive-url=https://web.archive.org/web/20091016192623/http://repositories.cdlib.org/cpcc/2/ |archive-date=October 16, 2009 }}</ref> The various forms of [[digital subscriber line]] (DSL) services are ''broadband'' in the sense that digital information is sent over multiple channels. Each channel is at a higher frequency than the [[baseband]] voice channel, so it can support [[plain old telephone service]] on a single pair of wires at the same time.<ref name="adsl-aa">{{cite web |url=http://aa.net.uk/kb-broadband-how.html |title=Knowledge Base - How Broadband Words |author=<!-- No author byline --> |access-date=July 27, 2016 |url-status=live |archive-url=https://web.archive.org/web/20160721170126/http://aa.net.uk/kb-broadband-how.html |archive-date=July 21, 2016 }}</ref> However, when that same line is converted to a [[loading coil|non-loaded]] twisted-pair wire (no telephone filters), it becomes hundreds of kilohertz wide (broadband) and can carry up to 100 megabits per second using very high-bit rate digital subscriber line ([[VDSL]] or VHDSL) techniques.<ref name="vdsl-itu">{{cite web |url=http://www.itu.int/newsroom/press_releases/2005/06.html |title=New ITU Standard Delivers 10x ADSL Speeds |author=<!-- No author byline --> |date=May 27, 2005 |access-date=July 27, 2016 |url-status=live |archive-url=https://web.archive.org/web/20160903203113/http://www.itu.int/newsroom/press_releases/2005/06.html |archive-date=September 3, 2016 }}</ref>

Modern networks have to carry integrated [[Network traffic measurement|traffic]] consisting of voice, video and data. The [[Broadband Integrated Services Digital Network]] (B-ISDN) was designed for these needs.<ref name=Jain>{{cite journal |title=Congestion Control and Traffic Management in ATM Networks |journal=Invited Submission to Computer Networks and ISDN Systems |volume=28 |year=1996 |pages=1723–1738 |author=Jain, Raj |url= http://www.cse.ohio-state.edu/~jain/papers/ftp/cnis/index.html|accessdate= 7 March 2005 |archiveurl= https://web.archive.org/web/20040619200707/http://www.cse.ohio-state.edu/~jain/papers/ftp/cnis/index.html|archivedate= 19 June 2004 |url-status=dead |doi= 10.1016/0169-7552(96)00012-8|arxiv=cs/9809085 |s2cid=47147736 }}</ref> The types of traffic supported by a broadband network can be classified according to three characteristics:<ref name=ATM>{{cite web |title= ATM Traffic Control |author= Juliano, Mark |url= http://www.byte.com/art/9412/sec10/art5.htm |accessdate= 3 March 2005 |archive-url= https://web.archive.org/web/20090114111829/http://www.byte.com/art/9412/sec10/art5.htm |archive-date= 2009-01-14 |url-status= dead }}</ref>

* [[Bandwidth (computing)|Bandwidth]] is the amount of network capacity required to support a connection.
* [[Network latency|Latency]] is the amount of delay associated with a connection. Requesting low latency in the [[quality of service]] (QoS) profile means that the cells need to travel quickly from one point in the network to another.
* Cell-delay variation (CDV) is the range of delays experienced by each group of associated cells. Low cell-delay variation means a group of cells must travel through the network without getting too far apart from one another.

[[Cellular network|Cellular networks]] utilize various standards for data transmission, including [[5G]] which can support one million separate devices per square kilometer.