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Ch 7. Transmission Media

Ch 7. Transmission Media. Transmission Media (1). Broad definition Anything that can carry information In data communication: Free space, metallic cable, fiber-optic cable. Transmission Media (2). History 19 th century – telegraph by Morse 1869 – telephone by Bell

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Ch 7. Transmission Media

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  1. Ch 7. Transmission Media

  2. Transmission Media (1) • Broad definition • Anything that can carry information • In data communication: • Free space, metallic cable, fiber-optic cable

  3. Transmission Media (2) • History • 19th century – telegraph by Morse • 1869 – telephone by Bell • 1895 – wireless communication by Hertz • Modern communication media – twisted-pair, coaxial cable, and optical fiber • Classification

  4. Telegraph http://www.youtube.com/watch?v=Lki3jxNLVCI

  5. Twisted-pair Cable • Two metal conductors: one for signal, the other for reference (ground) • Twisted for the equal amount of exposure of each line to the noise • Unshielded twisted-pair (UTP) vs. shielded twisted-pair (STP)

  6. Categories of UTP cables

  7. UTP Performance

  8. Coaxial Cable • Carry signals of a higher frequency than UTP • Central core conductor and outer conductor Categories of coaxial cables

  9. Coaxial Cable Performance

  10. UTP vs. Coaxial Coaxial cables UTP

  11. Fiber-Optical Cable • Bending of light ray • Guide light ray

  12. Optical Fiber Performance • Better performance than Coaxial and UTP (1/10) • Provide cost-effective solution for data transfer • Using WDM, at a rate of 1600 Gbps

  13. 7.2 Unguided Media: Wireless • Transport electro-magnetic waves without using a physical conductor • Propagation methods

  14. Wireless Transmissions • Radio waves (3K ~ 1GHz) • Long-distance, low rate communication • Radio, TV, paging • Microwaves (1G ~ 300GHz) • Short-distance, high rate communication • Cellular, satellite, wireless LANs • Infrared waves (300G ~ 400THz) • Very short range communication • Line-of-sight is required • In-door communication (e.g. remote controller)

  15. Antennas • Omni-directional(directionless) • Uni-directional

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