18-01-2013, 11:48 AM
KEY TERMS AND CONCEPTS
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1. Analog (235):
An analog signal is one in which a base carrier's alternating current frequency is modified in some way, such as by amplifying the strength of the signal or varying the frequency, in order to add information to the signal. Broadcast and telephone transmission have originally used analog technology.
An analog signal can be represented as a series of sine waves. The term originated because the modulation of the carrier wave is analogous to the fluctuations of the human voice or other sound that is being transmitted.
2. Bandwidth (249):
Bandwidth describes the transmission rate of a telecommunications media or network.
3. Bluetooth (239):
A telecommunications industry specification for short range wireless communications.
4. Client/Server Networks (232):
A client/server network is a computing environment where workstations (clients) connect to servers.
5. Coaxial Cable (236):
A sturdy copper or aluminum wire wrapped with spacers to insulate and protect it. Groups of coaxial cables may be bundled together in a bigger cable for ease of installation.
6. Communications satellites (238):
Earth satellites that serve as relay stations for communications signals.
7. Digital (235):
Digital describes electronic technology that generates, stores, and processes data in terms of two states. These states are typically represented as "0" and "1".
8. Extranets (223):
A network that links selected resources on an organization's network to its customers, suppliers, or other business partners, using internet technologies.
9. Fiber optics (236):
Fiber optics are a telecommunications media that uses cables consisting of very thin filaments of glass fibers to transmit laser light signals.
10. Internet Service Providers (217):
An ISP is a company that provides access to the Internet to individuals and organizations.
11. Internet Networking Technologies (214):
Internet networking technologies consist of hardware, software, and standardized protocols used to create telecommunications networks.
12. Inter-network Processors (242):
Internetwork processors such as bridges, routers, hubs, or gateways to other networks.
13. Intranets (221):
Intranets are secure, Internet-like networks for use only within an organization.
14. Legacy systems (232):
Legacy systems refer to an organization's outdated business information systems.
15. Local Area Networks - LANs (229):
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.
16. Metcalfe’s Law (210):
Metcalfe's Law expresses the value of a network as the square of the number of its users.
17. Middleware (214):
Middleware is a general term for any program that serves to "glue together" or mediate between two separate programs.
18. Modems (MOdulation - DEModulation) (241):
A modem is a device that converts the digital signals from input/output devices into analog signals for transmission over an analogue carrier at the sending node and converts analog signals back into digital signals at the receiving node.