and media used by the telecommunications channel. Client/Server Network A computer network where end-user workstations (clients) are connected via telecommunications links to network servers and possibly to mainframe superservers. Coaxial Cable A sturdy copper or aluminum wire wrapped with spacers to insulate and protect it. Groups of coaxial cables may also be bundled together in a bigger cable for ease of installation. Communications Satellite Earth satellites placed in stationary orbits above the equator that serve as relay stations for communications signals transmitted from earth stations. Extranet A network that links selected resources of a company with its customers, suppliers, and other business partners, using the Internet or private
networks to link the organizations' intranets. Fiber Optics The technology that uses cables consisting of very thin filaments of glass fibers that can conduct the light generated by lasers for high-speed telecommunications. Internetwork Processor Communications processors used by local area networks to interconnect them with other local area and wide area networks. Examples include switches, routers, hubs, and gateways. Intranet An Internet-like network within an organization. Web browser software provides easy access to internal Web sites established by business units, teams, and individuals, and other network resources and applications. Legacy Systems The older, traditional, mainframe-based business information systems of an organization. Local Area Network (LAN) A communications network that typically connects computers, terminals, and other computerized devices within a limited physical area such as an office, building, manufacturing plant, or other worksite. Middleware Software that helps diverse software programs and networked computer systems work together, thus promoting their interoperability. Modem (MOdulator-DEModulator) A device that converts the digital signals from input/output devices into appropriate frequencies at a transmission terminal and converts them back into digital signals at a receiving terminal. Multiplexer An electronic device that allows a single communications channel to carry simultaneous data transmissions from many terminals. Network An interconnected system of computers, terminals, and communications channels and devices. Network Architecture A master plan designed to promote an open, simple, flexible, and efficient telecommunications environment through the use of standard protocols, standard communications hardware and software interfaces, and the design of a standard multilevel telecommunications interface
between end users and computer systems. TCP/IP Transmission control protocol/Internet protocol. A suite of telecommunications network protocols used by the Internet, intranets, and extranets that has become a de facto network architecture standard for many companies.
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