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ISDN
ISDN Abbrev. for integrated services digital network. ISDN has been developed, primarily by the PTTs, as a vehicle for the provision of a single service that carries all forms of digitally encoded traffic on a common platform. ISDN is in principle capable of carrying speech, data, and video traffic, and currently (Spring 1995) offers a range of data rates – from 64 Kbps up to 1.536 Mbps (in North America) or 1.920 Mbps (in Europe); these data rates will certainly increase with time. In general, ISDN services are presented as multiple 64 Kbps services rather than as a single higher-speed service. The service is engineered so that, for the lower data rates, existing speech-quality local loops can be used from customers' premises to an exchange supporting ISDN access. For higher speeds it is necessary to install higher-grade bearers, typically an optical fiber. The main service offering is for virtual circuits with fast call set up and clear down; the tariff structure is based on a standing charge plus a usage charge based on aggregated call duration. The presence of a call-duration component means that beyond a certain point users will find it more effective to use a permanent leased connection to a standard digital bearer.
Basic-rate ISDN (B/ISDN) is an internationally standardized service that provides digital access at 64 Kbps, referred to as a B-channel, and can carry one channel of digitized speech, or data. A D-channel operates at 16 Kbps and is intended primarily for data. A typical local loop can operate at 144 Kbps, and can support two B-channels and a D-channel. Primary-rate ISDN (P/ISDN) is an internationally standardized service that provides digital access at 1.536 Mbps (1.920 Mbps in Europe), usually presented as 23 B-channels and one D-channel (30 B-channels and one D-channel in Europe). In addition some operators are now providing so-called N/ISDN, which offers multiple B-channels with several options on the number of channels in the range 1–30. Broadband ISDN is offered in a variety of formats in different countries, with total bandwidths as high as those offering the service feel able to operate, up to tens or hundreds of Mbps. |
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JOHN DAINTITH. "ISDN." A Dictionary of Computing. 2004. Encyclopedia.com. 10 Feb. 2012 <http://www.encyclopedia.com>. JOHN DAINTITH. "ISDN." A Dictionary of Computing. 2004. Encyclopedia.com. (February 10, 2012). http://www.encyclopedia.com/doc/1O11-ISDN.html JOHN DAINTITH. "ISDN." A Dictionary of Computing. 2004. Retrieved February 10, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O11-ISDN.html |
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Integrated Services Digital Network
Integrated Services Digital Network A digital telephony technology which enables the high-speed transfer of both voice and data across conventional telephone lines. It does this by creating two 64 kbits/s channels for data and voice. ISDN, as it is more commonly known, can offer speeds of around 128 kbits/s. It currently exists in two variants: BASIC RATE INTERFACE and the much less common PRIMARY RATE INTERFACE.
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DARREL INCE. "Integrated Services Digital Network." A Dictionary of the Internet. 2001. Encyclopedia.com. 10 Feb. 2012 <http://www.encyclopedia.com>. DARREL INCE. "Integrated Services Digital Network." A Dictionary of the Internet. 2001. Encyclopedia.com. (February 10, 2012). http://www.encyclopedia.com/doc/1O12-IntegratedServcsDgtlNtwrk.html DARREL INCE. "Integrated Services Digital Network." A Dictionary of the Internet. 2001. Retrieved February 10, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O12-IntegratedServcsDgtlNtwrk.html |
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Integrated Services Digital Network
Integrated Services Digital Network (ISDN) High-speed telephone lines that carry digital information. The various grades of ISDN can carry information more than a thousand times faster than conventional analogue voice lines. ISDN lines connect directly to a computer and do not need a modem.
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Cite this article
"Integrated Services Digital Network." World Encyclopedia. 2005. Encyclopedia.com. 10 Feb. 2012 <http://www.encyclopedia.com>. "Integrated Services Digital Network." World Encyclopedia. 2005. Encyclopedia.com. (February 10, 2012). http://www.encyclopedia.com/doc/1O142-IntegratedServcsDgtlNtwrk.html "Integrated Services Digital Network." World Encyclopedia. 2005. Retrieved February 10, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O142-IntegratedServcsDgtlNtwrk.html |
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ISDN
ISDN See INTEGRATED SERVICES DIGITAL NETWORK.
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Cite this article
DARREL INCE. "ISDN." A Dictionary of the Internet. 2001. Encyclopedia.com. 10 Feb. 2012 <http://www.encyclopedia.com>. DARREL INCE. "ISDN." A Dictionary of the Internet. 2001. Encyclopedia.com. (February 10, 2012). http://www.encyclopedia.com/doc/1O12-ISDN.html DARREL INCE. "ISDN." A Dictionary of the Internet. 2001. Retrieved February 10, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O12-ISDN.html |
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integrated services digital network
integrated services digital network See ISDN.
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Cite this article
JOHN DAINTITH. "integrated services digital network." A Dictionary of Computing. 2004. Encyclopedia.com. 10 Feb. 2012 <http://www.encyclopedia.com>. JOHN DAINTITH. "integrated services digital network." A Dictionary of Computing. 2004. Encyclopedia.com. (February 10, 2012). http://www.encyclopedia.com/doc/1O11-integratedservcsdgtlntwrk.html JOHN DAINTITH. "integrated services digital network." A Dictionary of Computing. 2004. Retrieved February 10, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O11-integratedservcsdgtlntwrk.html |
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ISDN
ISDN See Integrated Services Digital Network
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Cite this article
"ISDN." World Encyclopedia. 2005. Encyclopedia.com. 10 Feb. 2012 <http://www.encyclopedia.com>. "ISDN." World Encyclopedia. 2005. Encyclopedia.com. (February 10, 2012). http://www.encyclopedia.com/doc/1O142-ISDN.html "ISDN." World Encyclopedia. 2005. Retrieved February 10, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O142-ISDN.html |
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ISDN
ISDN Computing, Telecom. Integrated Services Digital Network
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Cite this article
FRAN ALEXANDER , PETER BLAIR , JOHN DAINTITH , ALICE GRANDISON , VALERIE ILLINGWORTH , ELIZABETH MARTIN , ANNE STIBBS , JUDY PEARSALL , and SARA TULLOCH. "ISDN." The Oxford Dictionary of Abbreviations. 1998. Encyclopedia.com. 10 Feb. 2012 <http://www.encyclopedia.com>. FRAN ALEXANDER , PETER BLAIR , JOHN DAINTITH , ALICE GRANDISON , VALERIE ILLINGWORTH , ELIZABETH MARTIN , ANNE STIBBS , JUDY PEARSALL , and SARA TULLOCH. "ISDN." The Oxford Dictionary of Abbreviations. 1998. Encyclopedia.com. (February 10, 2012). http://www.encyclopedia.com/doc/1O25-ISDN.html FRAN ALEXANDER , PETER BLAIR , JOHN DAINTITH , ALICE GRANDISON , VALERIE ILLINGWORTH , ELIZABETH MARTIN , ANNE STIBBS , JUDY PEARSALL , and SARA TULLOCH. "ISDN." The Oxford Dictionary of Abbreviations. 1998. Retrieved February 10, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O25-ISDN.html |
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