MIS notes pgs 386_422

MIS notes pgs 386_422 - Ch 4 Pgs 386-422 Telecommunications...

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Ch. 4 Pgs. 386-422 Telecommunications and Internet, Intranets, and Extranets An Overview of Telecommunications and Networks Refers to the electronic transmission of signals for communications, and it has the potential to create profound changes in business because it lessens the barriers of time and distance General model of telecommunications 1. sending computer system and equipment 2. signal 3. telecommunications device 4. medium - anything that carries an electronic signal and interfaces between a sending device and a receiving device 5. telecommunications device 6. receiving computer system and equipment Telecommunications Transmission Media Can be divided into two broad categories: guided transmission, in which communications signals are guided along a solid medium and wireless media, in which communications signals are sent over airwaves Guided media types o Twisted-pair wire cable o Coaxial cable o Fiber-optic cable Wireless media types o Microwave o Cellular o Infrared Telecommunications Devices Hardware device that allows electronic communication to occur or to occur more efficiently Some of the more common telecommunication devices are the Modem, Fax modem, Multiplexer, PBX Carriers and Services Types of carriers can be divided into three broad categories: local exchange carriers, competitive local exchange carriers, and long-distance carriers Local Exchange Carriers (LEC) A public telephone company in the United States that provides service to homes and businesses within its defined geographical area called its local access and transport area (LATA) Competitive Local Exchange Carriers (CLEC)
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A company that is allowed to compete with the LECs, such as a wireless, satellite or cable service provider Long-Distance Carriers A traditional long-distance phone provider, such as AT&T, Sprint, or MCI. Networks Computer network – the communications media, devices, and software needed to connect two or more computer systems or devices Basic Processing Strategies Three basic processing strategies can be followed: centralized, decentralized, or distributed Centralized Processing the processing alternative in which all processing occurs in a single location or facility Decentralized Processing the processing alternative in which processing devices are placed at various remote locations Distributed Processing the processing alternative in which computers are placed at remote locations but connected to each other via a network Terminal-to-Host, File Server, and Client/Server Systems Terminal-to-Host an architecture in which the application and database reside on one host computer, and the user interacts with the application and data using a “dumb” terminal File Server an architecture in which the application and database reside on the one host computer, called the file server Client/Server Systems
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MIS notes pgs 386_422 - Ch 4 Pgs 386-422 Telecommunications...

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