Cellular digital packet data: Difference between revisions
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{{Short description|Obsolete wide-area mobile data service}} | |||
{{Redirect|CDPD|British copyright law|Copyright, Designs and Patents Act 1988}} | {{Redirect|CDPD|British copyright law|Copyright, Designs and Patents Act 1988}} | ||
{{no footnotes|date=March 2013}} | {{no footnotes|date=March 2013}} | ||
'''Cellular Digital Packet Data''' ('''CDPD''') is an obsolete wide-area mobile data service which used unused [[Bandwidth (signal processing)|bandwidth]] normally used by [[Advanced Mobile Phone System]] (AMPS) [[mobile phone]]s between 800 and 900 [[MHz]] to transfer data. Speeds up to 19.2 [[kbit/s]] were possible, though real world speeds seldom reached higher than 9.6 kbit/s. The service was discontinued in conjunction with the retirement of the parent AMPS service; it has been functionally replaced by faster services such as [[1xRTT]], [[EV-DO|Evolution-Data Optimized]], and [[UMTS]]/[[High Speed Packet Access]] (HSPA). | '''Cellular Digital Packet Data''' ('''CDPD''') is an obsolete wide-area mobile data service which used unused [[Bandwidth (signal processing)|bandwidth]] normally used by [[Advanced Mobile Phone System]] (AMPS) [[mobile phone]]s between 800 and 900 [[MHz]] to transfer data. Speeds up to 19.2 [[kbit/s]] were possible, though real world speeds seldom reached higher than 9.6 kbit/s.<ref>{{Cite web |title=Look Ma, No Wires! |url=http://www.cio.com/archive/060197/et.html |url-status=dead |archive-url=https://web.archive.org/web/20070223090938/http://www.cio.com/archive/060197/et.html |archive-date=23 February 2007}}</ref> The service was discontinued in conjunction with the retirement of the parent AMPS service; it has been functionally replaced by faster services such as [[1xRTT]], [[EV-DO|Evolution-Data Optimized]], and [[UMTS]]/[[High Speed Packet Access]] (HSPA). | ||
Developed in the early 1990s, CDPD was large on the horizon as a future technology. However, it had difficulty competing against existing slower but less expensive [[Mobitex]] and [[DataTac|DataTAC]] systems, and never quite gained widespread acceptance before newer, faster standards such as [[GPRS|General Packet Radio Service]] (GPRS) became dominant. | Developed in the early 1990s, CDPD was large on the horizon as a future technology. However, it had difficulty competing against existing slower but less expensive [[Mobitex]] and [[DataTac|DataTAC]] systems, and never quite gained widespread acceptance before newer, faster standards such as [[GPRS|General Packet Radio Service]] (GPRS) became dominant. | ||
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==External links== | ==External links== | ||
* [http://www.emory.edu/BUSINESS/et/cdpd/ History and Development] {{Webarchive|url=https://web.archive.org/web/20040604053812/http://www.emory.edu/BUSINESS/et/cdpd/ |date=2004-06-04 }} | * [http://www.emory.edu/BUSINESS/et/cdpd/ History and Development] {{Webarchive|url=https://web.archive.org/web/20040604053812/http://www.emory.edu/BUSINESS/et/cdpd/ |date=2004-06-04 }} | ||
* [http://webmasters-forums.com/Cellular-Digital-Packet-Data-%28CDPD%29-t-393.html Detailed Description About CDPD] {{Webarchive|url=https://web.archive.org/web/20070330032352/http://webmasters-forums.com/Cellular-Digital-Packet-Data-%28CDPD%29-t-393.html |date=2007-03-30 }} | * [http://webmasters-forums.com/Cellular-Digital-Packet-Data-%28CDPD%29-t-393.html Detailed Description About CDPD] {{Webarchive|url=https://web.archive.org/web/20070330032352/http://webmasters-forums.com/Cellular-Digital-Packet-Data-%28CDPD%29-t-393.html |date=2007-03-30 }} | ||
{{Mobile telecommunications standards}} | == References == | ||
{{Reflist}}{{Mobile telecommunications standards}} | |||
{{Authority control}} | {{Authority control}} | ||
[[Category:First generation mobile telecommunications]] | [[Category:First generation mobile telecommunications]] | ||