Ex2Review.0331 - MIS 388 Exam 2 Review Chapter 6:...

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MIS 388 Exam 2 Review Chapter 6: Telecommunications and Networks Fiber optics (236) Definition: o Fiber optics are a telecommunications media that uses cables consisting of very thin filaments of glass fibers to transmit laser light signals. Cables consisting of one or more hair-thin filaments of glass fiber wrapped in a protective jacket. Not affected by and do not generate electromagnetic radiation; multiple fibers can be placed in the same cable. Less need for repeaters for signal retransmissions than copper wire media. Much lower data error rate Harder to tap than electrical wire and cable Expected to replace other communications media in many applications Local area networks – LANs (229) Definition: o A LAN is a communications network that connects computers, terminals, and other computerized devices within a limited physical area such as an office, building, floor, manufacturing plant, or worksite. Commonplace in many organizations for providing telecommunications network capabilities that link end users in offices, departments, and other workgroups. Variety of telecommunications media: o Ordinary telephone wiring o Coaxial cable o Wireless radio and infrared systems o Interconnect microcomputer workstations and computer peripherals. Communicate over the network, each PC usually has a circuit board called a “ Network Interface Card Use more powerful microcomputer with a large hard disk capacity, called “File Server” or “Network Server”. o Contains a network operating system program that controls telecommunications and the use and sharing of network resources.
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Multiplexer (242) Definition: o An electronic device that allows a single communications channel to carry simultaneous data transmissions from many terminals. Accomplished in Two Ways: o Frequency Division Multiplexing—effectively divides a high-speed channel into multiple slow-speed channels. o Time Division Multiplexing—divides the time each terminal can use the high-speed line into very short time slots, or time frames. Work to increase the number of transmissions possible without increasing the number of physical data channels. Open Systems (212) Definition: o An open system is one that is built using non-proprietary, standard protocols. Common standards for hardware, software, applications, and networking. Create a computing environment that is open to easy access by end users and their networked computer systems. Greater connectivity; the ability of networked computers and other devices to access and communicate with one another easily and share information. Provides high degree of network interoperability Enables many different activities of end users to be accomplished using the different varieties of computer systems, software packages, and databases provided by a variety of interconnected networks.
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This note was uploaded on 09/30/2010 for the course MIS 388 taught by Professor Kohers during the Spring '08 term at Sam Houston State University.

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Ex2Review.0331 - MIS 388 Exam 2 Review Chapter 6:...

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