L2TransMedia6 - Part 1 Data Transmission Part 1 Data...

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1 Part 1 – Data Transmission Transmission Media Gail Hopkins Part 1 – Data Transmission Introduction ± Computer communication involves encoding data into some form of energy and sending this across a transmission medium ± This lecture introduces: Ð Basic transmission concepts Ð Properties of different transmission media Part 1 – Data Transmission Types of Transmission Media ± Copper Wire ± Glass Fibre ± Microwave ± Infrared ± Laser ± Wireless Transmission Part 1 – Data Transmission Copper Wire ± The most common medium as its is inexpensive and easy to install ± Why copper? ± The biggest problem is interference which results in noise ± At its worst when wires run parallel and close together Ð Twisted Pair Ð Coaxial Cable Part 1 – Data Transmission Solution 1: Twisted Pair ± Shield the wires and then twist them together (e.g., telephone wires) ± Minimises both radiation and susceptibility to radiation ± Unshielded Twisted Pair (UTP) used in Ethernet and telephone systems Part 1 – Data Transmission Twisted Pair for Multiple Concurrent Connections ± Can contain 1000s of pairs (outdoor telephone cables) Ð Each pair has different twist rate Ð Bundles twisted together inside one sheath Source: http://en.wikipedia.org/wiki/Twisted_ pair
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2 Part 1 – Data Transmission Shielded Twisted Pair (STP) Source: http://en.wikipedia.org/wiki/Twisted_pair ± Metal shielding over each pair of copper wires Part 1 – Data Transmission Solution 2: Coaxial Cable ± Single wire surrounded by cylindrical metal shield ± Shield provides a barrier in both directions
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This note was uploaded on 08/14/2011 for the course ELECTRONIC G52CCN taught by Professor Professorgail during the Spring '09 term at Uni. Nottingham.

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L2TransMedia6 - Part 1 Data Transmission Part 1 Data...

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