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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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