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04-TransmissionMedia

04-TransmissionMedia - William Stallings Data and Computer...

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1 William Stallings Data and Computer Communications 7 th Edition Chapter 4 Transmission Media
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2 Overview Guided transmission media – wire (twisted pair,  cable, fiber) Unguided – wireless (radio wave, microwave,  satellite) Characteristics and quality determined by  medium and signal For guided, the medium is more important For unguided, the bandwidth produced by the  antenna is more important Key concerns are data rate and distance
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3 Design Factors Bandwidth Higher bandwidth gives higher data rate Transmission impairments Attenuation Interference Number of receivers In guided media More receivers (multi-point) introduce more  attenuation (need more amplifies or repeaters)
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4 Electromagnetic Spectrum
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5 Guided Transmission Media Twisted Pair Coaxial cable Optical fiber
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6 Twisted Pair
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7 Twisted Pair - Applications Most common medium Telephone network Between house and local exchange (subscriber loop) Within buildings To private branch exchange (PBX) For local area networks (LAN) 10Mbps or 100Mbps
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8 Twisted Pair - Pros and Cons Cheap Easy to work with Low data rate Short range
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9 Twisted Pair - Transmission Characteristics Analog  Amplifiers every 5km to 6km Digital Use either analog or digital signals repeater every 2km or 3km
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