Integrated Services Digital Network
<communications> (ISDN) A set of communications standards allowing a single wire or optical fibre to carry voice, digital network services and video. ISDN is intended to eventually replace the plain old telephone system. ISDN was first published as one of the 1984 ITU-T Red Book recommendations. The 1988 Blue Book recommendations added many new features. ISDN uses mostly existing Public Switched Telephone Network (PSTN) switches and wiring, upgraded so that the basic "call" is a 64 kilobits per second, all-digital end-to-end channel. Packet and frame modes are also provided in some places. There are different kinds of ISDN connection of varying bandwidth (see DS level): DS0 = 1 channel PCM at 64 kbps T1 or DS1 = 24 channels PCM at 1.54 Mbps T1C or DS1C = 48 channels PCM at 3.15 Mbps T2 or DS2 = 96 channels PCM at 6.31 Mbps T3 or DS3 = 672 channels PCM at 44.736 Mbps T4 or DS4 = 4032 channels PCM at 274.1 Mbps Each channel here is equivalent to one voice channel. DS0 is the lowest level of the circuit. T1C, T2 and T4 are rarely used, except maybe for T2 over microwave links. For some reason 64 kbps is never called "T0". A Basic Rate Interface (BRI) is two 64K "bearer" channels and a single "delta" channel ("2B+D"). A Primary Rate Interface (PRI) in North America and Japan consists of 24 channels, usually 23 B + 1 D channel with the same physical interface as T1. Elsewhere the PRI usually has 30 B + 1 D channel and an E1 interface. A Terminal Adaptor (TA) can be used to connect ISDN channels to existing interfaces such as EIA-232 and V.35. Different services may be requested by specifying different values in the "Bearer Capability" field in the call setup message. One ISDN service is "telephony" (i.e. voice), which can be provided using less than the full 64 kbps bandwidth (64 kbps would provide for 8192 eight-bit samples per second) but will require the same special processing or bit diddling as ordinary PSTN calls. Data calls have a Bearer Capability of "64 kbps unrestricted". ISDN is offered by local telephone companies, but most readily in Australia, France, Japan and Singapore, with the UK somewhat behind and availability in the USA rather spotty. (In March 1994) ISDN deployment in Germany is quite impressive, although (or perhaps, because) they use a specifically German signalling specification, called 1.TR.6. The French Numeris also uses a non-standard protocol (called VN4; the 4th version), but the popularity of ISDN in France is probably lower than in Germany, given the ludicrous pricing. There is also a specifically-Belgian V1 experimental system. The whole of Europe is now phasing in Euro-ISDN. See also Frame Relay, Network Termination, SAPI. FAQ. Usenet newsgroup: news:comp.dcom.isdn. (1998-03-29) | ||||
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Integrated services digital network definition was found in categories: Computer & Internet(7) Science & Technology(5) Business & Finance(1) Language, Idioms & Slang(2) Encyclopedia(1)
Integrated services digital network Definition from Computer & Internet Dictionaries & Glossaries
| Glossary of the European Information Society |
ISDN (Integrated Services Digital Network), N-ISDN, B-ISDN
A single network capable of carrying several different types of service, based on voice, data, still or moving image - by means of digital transmission techniques. The ISDN currently being deployed in Europe carries a communication of up to 2 Megabits/second (Narrowband ISDN). Future networks will carry higher speed communications (Broadband ISDN).
A single network capable of carrying several different types of service, based on voice, data, still or moving image - by means of digital transmission techniques. The ISDN currently being deployed in Europe carries a communication of up to 2 Megabits/second (Narrowband ISDN). Future networks will carry higher speed communications (Broadband ISDN).
| A Glossary of Internet & PC Terminology |
ISDN
Integrated Services Digital Network is a fast digital phone line - can be provided by most phone companies. To be able to reap the benefits you will need to add a special card to your PC and your Internet Service Provider must be able to provide an ISDN connection.
Integrated Services Digital Network is a fast digital phone line - can be provided by most phone companies. To be able to reap the benefits you will need to add a special card to your PC and your Internet Service Provider must be able to provide an ISDN connection.
| Smart Card Terms |
ISDN
A set of CCITT /ITU standards for digital transmission over ordinary telephone copper wire as well as over other media). In addition to higher bandwidth, ISDN offers extended services compared to PSTN.
A set of CCITT /ITU standards for digital transmission over ordinary telephone copper wire as well as over other media). In addition to higher bandwidth, ISDN offers extended services compared to PSTN.
| WebGuest Web Glossary |
ISDN - Integrated Services Digital Network
Digital telephone system that can provide high-speed (up to 128 Kbps ) transmission of voice and data.
Digital telephone system that can provide high-speed (up to 128 Kbps ) transmission of voice and data.
| Multimedia Glossary |
ISDN (Integrated Services Digital Network)
a network/telephone connection that transfers data at rates more than 4 times faster than a 28.8Kbps modem. Ordinary modems (non-ISDN) convert computer data to audio tones/analog to transfer over the phone lines. ISDN "modems" connect digitally : Inherently faster digital signals rather than tone signals transfer over the lines. Network transfer speed comparison
Basic Rate ISDN, often called "2B+D" or BRI, arrives on 3 channels - one Delta ("D") 16 Kbps channel carrying telephone signals and two "Bearer" ("B") channels delivering data at 64 Kbps. Primary Rate ISDN, also known as T1 service, has 23 B channels and one D channel, delivering at a rate of 1.544 Mbps (T3 transmits at an extremely high rate - 44.7 Mbps).
a network/telephone connection that transfers data at rates more than 4 times faster than a 28.8Kbps modem. Ordinary modems (non-ISDN) convert computer data to audio tones/analog to transfer over the phone lines. ISDN "modems" connect digitally : Inherently faster digital signals rather than tone signals transfer over the lines. Network transfer speed comparison
Basic Rate ISDN, often called "2B+D" or BRI, arrives on 3 channels - one Delta ("D") 16 Kbps channel carrying telephone signals and two "Bearer" ("B") channels delivering data at 64 Kbps. Primary Rate ISDN, also known as T1 service, has 23 B channels and one D channel, delivering at a rate of 1.544 Mbps (T3 transmits at an extremely high rate - 44.7 Mbps).
| Internetworking Terms |
Integrated Services Digital Network
An emerging technology which is beginning to be offered by the telephone carriers of the world. ISDN combines voice and digital network services in a single medium, making it possible to offer customers digital data services as well as voice connections through a single "wire". The standards that define ISDN are specified by CCITT. See also: CCITT. [Source: RFC1208]
An emerging technology which is beginning to be offered by the telephone carriers of the world. ISDN combines voice and digital network services in a single medium, making it possible to offer customers digital data services as well as voice connections through a single "wire". The standards that define ISDN are specified by CCITT. See also: CCITT. [Source: RFC1208]
| The Internet Dictionary |
ISDN
(Integrated Services Digital Network). Special connections that use ordinary phone lines to transmit digital instead of analog signals. Briefly, ISDN is a telecommunications network that allows for digital voice, video, and data transmissions. ISDN replaces the slow and inefficient analog telephone system with a fast and efficient digital communications network. ISDN lines contain two channels: a B channel, which has a 64Kbps (kilobits per second) data transmission rate, and a D channel, which has either a 16Kbps or 64Kbps transmission rate. When the two lines are used together, transmitted data can travel at 128Kbps. Compare ISDN and T-1, T-3 lines .
(Integrated Services Digital Network). Special connections that use ordinary phone lines to transmit digital instead of analog signals. Briefly, ISDN is a telecommunications network that allows for digital voice, video, and data transmissions. ISDN replaces the slow and inefficient analog telephone system with a fast and efficient digital communications network. ISDN lines contain two channels: a B channel, which has a 64Kbps (kilobits per second) data transmission rate, and a D channel, which has either a 16Kbps or 64Kbps transmission rate. When the two lines are used together, transmitted data can travel at 128Kbps. Compare ISDN and T-1, T-3 lines .
Integrated services digital network Definition from Science & Technology Dictionaries & Glossaries
| Energy Glossary |
ISDN
(INTEGRATED SERVICES DIGITAL NETWORK) - A 128 Kbps(kilobytes per second) digital telephone service available in many parts of the country though not universally available thatmay be able to substitute for fiber optic cable in every respect except possibly television transmission.
(INTEGRATED SERVICES DIGITAL NETWORK) - A 128 Kbps(kilobytes per second) digital telephone service available in many parts of the country though not universally available thatmay be able to substitute for fiber optic cable in every respect except possibly television transmission.
| Fiber Optics, Optical Networking Terms |
Integrated Services Digital Network
An integrated digital network in which the same time-division switches and digital transmission paths are used to establish connections for services such as telephone, data, electronic mail and facsimile. How a connection is accomplished is often specified as a switched connection, nonswitched connection, exchange connection, ISDN connection, etc.
An integrated digital network in which the same time-division switches and digital transmission paths are used to establish connections for services such as telephone, data, electronic mail and facsimile. How a connection is accomplished is often specified as a switched connection, nonswitched connection, exchange connection, ISDN connection, etc.
| Telecommunication Standard Terms |
| Technical English by wpv |
Integrated Services Digital Network (ISDN)
A telephone service that brings a digital loop to the telephone subscriber's premises and integrates all forms of information (voice, computer data, facsimile, etc.) onto a single communications network.
A telephone service that brings a digital loop to the telephone subscriber's premises and integrates all forms of information (voice, computer data, facsimile, etc.) onto a single communications network.
| RF Electronics |
Integrated Services Digital Network (ISDN)
A network, evolved from the telephony Integrated Digital Network (IDN), that provides end-to-end digital connectivity to support a wide range of services, including voice and nonvoice services, to which users have access by a limited set of standard multipurpose customer interfaces. It is a telecommunications network driven by the communications needs (both voice and nonvoice) of the customers.
A network, evolved from the telephony Integrated Digital Network (IDN), that provides end-to-end digital connectivity to support a wide range of services, including voice and nonvoice services, to which users have access by a limited set of standard multipurpose customer interfaces. It is a telecommunications network driven by the communications needs (both voice and nonvoice) of the customers.
Integrated services digital network Definition from Business & Finance Dictionaries & Glossaries
| Raynet Business & Marketing Glossary |
ISDN: Integrated Services Digital Network.
a standard designed to move different kinds of data (at up to 128,000 bits/sec over regular lines, but usually 56,000-64,000) over a phone line
a standard designed to move different kinds of data (at up to 128,000 bits/sec over regular lines, but usually 56,000-64,000) over a phone line
Integrated services digital network Definition from Language, Idioms & Slang Dictionaries & Glossaries
| hEnglish - advanced version |
integrated services digital network
integrated services digital network
(isdn) a set of communications standards allowing a single wire or optical fibre to carry voice, digital network services and video. isdn is intended to eventually replace the plain old telephone system.
integrated services digital network
(isdn) a set of communications standards allowing a single wire or optical fibre to carry voice, digital network services and video. isdn is intended to eventually replace the plain old telephone system.
| Concise English-Irish Dictionary v. 1.1 |
ISDN
Integrated Services Digital Network: Córas Comhtháite Seirbhísí Digiteacha (CCSD)
Integrated Services Digital Network: Córas Comhtháite Seirbhísí Digiteacha (CCSD)
Integrated services digital network Definition from Encyclopedia Dictionaries & Glossaries
| Wikipedia English - The Free Encyclopedia |
Integrated Services Digital Network
Integrated Services Digital Network (ISDN) is a circuit-switched telephone network system, designed to allow digital transmission of voice and data over ordinary telephone copper wires, resulting in better quality and higher data speeds than are available with analog. More broadly, ISDN is a set of protocols for establishing and breaking circuit switched connections, and for advanced call features for the user. It was invented by Prof. Jaxin Hall of Sussex, UK in the late 1980's.
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