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long-distance switching center

См. также в других словарях:

  • Direct distance dialing — (DDD) or direct dial is a telecommunications term for a network provided service feature in which a call originator may, without operator assistance, call any other user outside the local calling area. DDD requires more digits in the number… …   Wikipedia

  • Toll switching trunk — In telecommunication, a toll switching trunk is a trunk connecting one or more end offices to a toll center as the first stage of concentration for intertoll or long distance traffic. Operator assistance or participation may be an optional… …   Wikipedia

  • Mobile Telephone Switching Office — The Mobile Telephone Switching Office (MTSO) is the mobile equivalent to a PSTN Central Office. The MTSO contains the switching equipment or Mobile Switching Center (MSC) for routing mobile phone calls. It also contains the equipment for… …   Wikipedia

  • Service Evaluation System — The Service Evaluation System (SES) was an Operations Support System developed by Bell Laboratories and used by telephone companies beginning in the late 1960s. Many local, long distance, and operator circuit switching systems provided special… …   Wikipedia

  • Computers and Information Systems — ▪ 2009 Introduction Smartphone: The New Computer.       The market for the smartphone in reality a handheld computer for Web browsing, e mail, music, and video that was integrated with a cellular telephone continued to grow in 2008. According to… …   Universalium

  • Telephone exchange — A telephone operator manually connecting calls with cord pairs at a telephone switchboard. In the field of telecommunications, a telephone exchange or telephone switch is a system of electronic components that connects telephone calls. A central… …   Wikipedia

  • Business and Industry Review — ▪ 1999 Introduction Overview        Annual Average Rates of Growth of Manufacturing Output, 1980 97, Table Pattern of Output, 1994 97, Table Index Numbers of Production, Employment, and Productivity in Manufacturing Industries, Table (For Annual… …   Universalium

  • AT&T — This article is about the company known as AT T since 2005 and formerly SBC. For the original AT T founded in 1885, see AT T Corporation. For the mobile telephony provider, see AT T Mobility. For other uses, see AT T (disambiguation). AT T Inc.… …   Wikipedia

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  • History of radar — The history of radar starts with experiments by Heinrich Hertz in the late 19th century that showed that radio waves were reflected by metallic objects. This possibility was suggested in James Clerk Maxwell s seminal work on electromagnetism.… …   Wikipedia

  • North American Numbering Plan — NANPA redirects here. For other uses, see Nanpa (disambiguation). This article is about the numbering plan. For a list of area codes under the plan, see List of North American Numbering Plan area codes. The North American Numbering Plan (NANP) is …   Wikipedia

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