04-TransmissionMedia

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

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William Stallings Data and Computer Communications 7 th Edition Chapter 4 Transmission Media
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Overview Guided - wire Unguided - wireless 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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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
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Electromagnetic Spectrum
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Guided Transmission Media Twisted Pair Coaxial cable Optical fiber
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Twisted Pair
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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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Twisted Pair - Pros and Cons Cheap Easy to work with Low data rate Short range
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Twisted Pair - Transmission Characteristics Analog  Amplifiers every 5km to 6km Digital Use either analog or digital signals repeater every 2km or 3km Limited distance Limited bandwidth (1MHz) Limited data rate (100Mbps) Susceptible to interference and noise
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Near End Crosstalk Coupling of signal from one pair to another Coupling takes place when transmit signal  entering the link couples back to receiving pair i.e. near transmitted signal is picked up by near  receiving pair
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Unshielded and Shielded TP Unshielded Twisted Pair (UTP) Ordinary telephone wire Cheapest Easiest to install Suffers from external EM interference Shielded Twisted Pair (STP) Metal braid or sheathing that reduces interference More expensive Harder to handle (thick, heavy)
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This note was uploaded on 02/10/2012 for the course CSC 411 taught by Professor Simmons during the Spring '08 term at S. Alabama.

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

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