chap01 - Telecommunications Overview Chapter 1 Objectives...

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Telecommunications Overview Chapter 1
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Objectives In this chapter, you will learn to: Define communication and telecommunication Illustrate components of a communication system Understand the difference between voice, video, and data telecommunications Describe how telecommunication is used in a variety of industries Identify careers available to telecommunications professionals Identify the organizations responsible for establishing significant telecommunications standards and policies
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What is communication? The Romans used the Latin word communicare when they meant "to make common, to share, or to impart.” Communication is the sharing of information or messages between two or more entities.
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Elements of a Communication System Source - the originator of the message, whether it is a person or machine. Transmitter - the equipment that modifies the message (either data or voice) into the form required for transmission. Communications channel - the means of carrying the signal from the source to the destination.
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Elements of a Communication System Transmission media - may be physical, like a copper wire or fiber optic cable, or atmospheric, like radio waves. Receiver - is the device that captures the message from the communications channel and converts it into a form that the person or machine at the destination can understand. Destination - the person or machine to whom the message is directed
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Elements of a Communication System
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Flow of Messages Simplex - the type of communication in which messages flow in only one direction, from source to destination. Half-duplex communication - occurs when messages travel in both directions between the source and the destination, but in only one direction at a time. Full-duplex communication - messages can travel over the communications channel in both directions simultaneously.
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Flow of Messages
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Relative Number of Sources and Destinations One-to-one communication - a single source sends information to a single destination. One-to-many communication - a single source simultaneously sends information to multiple destinations. Many-to-many communication - occurs when many sources issue messages to many destinations.
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Relative Number of Sources and Destinations
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What is Telecommunication? Communication that spans a distance. Voice telecommunication - using electrical signals to transmit human voice across a distance, such as telephones and radio broadcasts. Video telecommunication - the electrically-based transmission of moving pictures and sound across a distance. Data telecommunication - the use of electrical signals to exchange encoded information between computerized devices across a distance.
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What is Telecommunication?
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Voice The telephony infrastructure includes cross- continental fiber optic cable to facilitate international voice telecommunications and national and regional cabling to connect long distance calls. It includes numerous local, regional, and national switching
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This note was uploaded on 10/25/2009 for the course IT 300 taught by Professor Staff during the Spring '08 term at George Mason.

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chap01 - Telecommunications Overview Chapter 1 Objectives...

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