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In [[telecommunications]] and [[computing]], '''bit rate''' ('''bitrate''' or as a variable ''R'') is the number of [[bit]]s that are conveyed or processed per unit of time.<ref>{{cite book |url = https://books.google.com/books?id=-kNn_p6WA38C&pg=PA21 |title=Data Communications and Computer Networks | first =Prakash C | last = Gupta |publisher=PHI Learning |year= 2006 |isbn=9788120328464 |access-date=10 July 2011}}</ref>
The bit rate is expressed in the unit '''bit per second''' (symbol: '''bit/s'''), often in conjunction with an [[SI prefix]] such as [[kilo-|kilo]] (1 kbit/s = 1,000 bit/s), [[mega-|mega]] (1 Mbit/s = 1,000 kbit/s), [[giga-|giga]] (1 Gbit/s = 1,000 Mbit/s) or [[tera-|tera]] (1 Tbit/s = 1,000 Gbit/s).<ref>{{cite web|url=http://www.iec.ch/si/binary.htm|title=Prefixes for binary multiples|author=International Electrotechnical Commission|author-link=International Electrotechnical Commission|year=2007|access-date=4
In most computing and digital communication environments, one '''byte per second''' (symbol: '''B/s''') corresponds to 8 bit/s.
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