dumas_ch02 - Chapter 2: TheModernSignalCarriers:...

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Chapter 2: The Modern Signal Carriers:  Electricity, Light, Media, and  Impairments Principles of Computer Networks  Principles of Computer Networks  and Communications and Communications M. Barry Dumas and Morris Schwartz M. Barry Dumas and Morris Schwartz
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Chapter 2 Principles of Computer Networks and Communications 2 Objectives Describe properties of electricity and electrical media Describe signal impairments in electrical transmission Differentiate between guided and unguided media, and list types of each Explain the role of light in communications, including sources, media, and transmission method
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Chapter 2 Principles of Computer Networks and Communications 3 Overview Electricity and electromagnetic waves : Carry data as signals that propagate through a medium (physical path) Consist of one or more types of transmission media, that is: Bounded—confined by cables Unbounded—through air or space Are connected by switching and other equipment
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Chapter 2 Principles of Computer Networks and Communications 4 Properties of Electricity and Electrical Media Ampere (Amp) Magnitude of electrical current Named after André Marie Ampère (French) Volt (v) Measure of electrical potential or pressure Named after Alessandro Giuseppe Volta (Italian) Ohm (ohm) Measure of resistance to current flow Named after Georg Simon Ohm (Greek)
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Chapter 2 Principles of Computer Networks and Communications 5 Properties of Electricity and Electrical Media Electricity consists of a flow of electrons called a current whose magnitude is measured in amperes , and strength (pressure) in volts .” 1 Volt = Electrical pressure required to move 1 AMP of current through 1 OHM of resistance
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Chapter 2 Principles of Computer Networks and Communications 6 Properties of Electricity and Electrical Media Electricity consists of a flow of electrons called a current whose magnitude is measured in amperes , and strength (pressure) in volts .” Conduction —the process of electron flow Conductors accommodate electrical flow: Copper Aluminum
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Chapter 2 Principles of Computer Networks and Communications 7 Properties of Electricity and Electrical Media Electricity consists of a flow of electrons called a current whose magnitude is measured in amperes , and strength (pressure) in volts .” Resistance— opposition to electron flow Insulators resist electrical flow: Rubber Plastic Air
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Chapter 2 Principles of Computer Networks and Communications 8 Properties of Electricity and Electrical Media Electricity consists of a flow of electrons called a current whose magnitude is measured in amperes , and strength (pressure) in volts .” Semi-conductors Usually act as insulators but can also behave as conductors Basis for computer chips
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Chapter 2 Principles of Computer Networks and Communications 9 Properties of Electricity and Electrical Media—Current
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dumas_ch02 - Chapter 2: TheModernSignalCarriers:...

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