Physical Layer Transmission Media

Physical Layer Transmission Media - CSCI 232 - Computer...

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CSCI 232 - Computer Networking Physical Layer Transmission Media George Blankenship 1 Physical Layer Transmission Media George Blankenship 1 CSCI 232 Computer Networking: Physical Layer Transmission Media George Blankenship Physical Layer Transmission Media George Blankenship 2 Lecture Outline • Guided –w ire • Unguided – wireless Physical Layer Transmission Media George Blankenship 3 Design Factors • Key concerns are data rate and distance – Higher bandwidth gives higher data rate – Transmission impairments increase with distance (decrease data rate) • Number of receivers – More receivers (multi-point) introduce more attenuation • Characteristics and quality – Determined by medium and signal – For guided, the medium is more important – For unguided, the bandwidth produced by the antenna
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CSCI 232 - Computer Networking Physical Layer Transmission Media George Blankenship 2 Physical Layer Transmission Media George Blankenship 4 Electromagnetic Spectrum Physical Layer Transmission Media George Blankenship 5 Guided Transmission Media •Tw i s t ed P a i
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CSCI 232 - Computer Networking Physical Layer Transmission Media George Blankenship 3 Physical Layer Transmission Media George Blankenship 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) – 10 Mbps or 100 Mbps Physical Layer Transmission Media George Blankenship 8 Twisted Pair - Pros and Cons •Ch e ap • Easy to work with • Low data rate • Short range Physical Layer Transmission Media George Blankenship 9 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 (1 MHz)
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CSCI 232 - Computer Networking Physical Layer Transmission Media George Blankenship 4 Physical Layer Transmission Media George Blankenship 10 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 • Near transmitted signal is picked up by near receiving pair Physical Layer Transmission Media George Blankenship 11 Unshielded and Shielded TP • Unshielded Twisted Pair (UTP) – Ordinary telephone wire – Cheapest – Easiest to install
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This note was uploaded on 09/03/2010 for the course CS 232 taught by Professor Susan during the Summer '09 term at GWU.

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Physical Layer Transmission Media - CSCI 232 - Computer...

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