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Iridium
| Telecommunications Glossary |
Motorola`s $3 billion worldwide direct cellular project which will enable users to have one worldwide number. this will be accomplished by a system of low earth orbiting satellites (leos).
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Иридий, русский
(лат . iridium), ir, химический элемент viii группы периодической системы, атомный номер 77, атомная масса 192,22, относится к платиновым металлам. плотность 22,65 г/см3, tпл 2447 °с. применяют для нанесения защитных покрытий. компонент сплавов с pt, os и др. (химическая аппаратура, эталоны мер, детали измерительных приборов, напайка "вечных перьев"). название от греч. iris - радуга.
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Satellites, латинский
Accomplish, английский
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Isdn - integrated services digital network, английский
A set of standards provide a common architecture for the development and deployment of digitally integrated communications services. a set of standardized customer interfaces and signaling protocols for delivering digital circuit-switched voice/data and packet-switched data services. isdn is designed to provide standard interfaces to custom premises equipment such as computers, telephones, and facsimile machines through basic rate interface (bri) to pbxs, host computers, and lans through primary rate interface (pri); to the pubic glossary/45 switched network through ss7; and to local packet data terminals and the public packet-switched network through x.25 and x.75/x.75` packet services. the key to isdn is out-of-band signaling which permits the users` equipment and the network to exchange control and signaling information over a separate channel from that which carries user information. a digital telecommunications channel that allows integrated transmission of voice, video and data. isdn lines used to access network services are divided into bearer, or b channels, and a supervisory, or d channel, for out-of-band signaling. b channels carry digitally encoded customer information such as voice and data traffic, while the d channel provides the information required to set up, route and disconnect calls on b channels. d channels can also carry other information such as caller identification. twenty-three b channels and one d channel form a primary rate interface or 23b+d. pri b channels can be used for any combination of voice, data, and image transmission at 64 kpbs. in addition, b channels can be grouped together to create wider bandwidths for applications like video transmission.
Irc - internet relay chat, английский
A service where users can talk via typing to people around the world.
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