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Transmission Media

Transmission Media. Type of media. Conductive metal twisted pair, coaxial cable Glass or plastic fiber optic Wireless microwave, satellite. Twisted Pair. Conductor Wire Dielectric Foil Shield Braid Shield Jacket. Shield Twisted-Pair Cable (STP). covered with a foil shield

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Transmission Media

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  1. Transmission Media

  2. Type of media • Conductive metal twisted pair, coaxial cable • Glass or plastic fiber optic • Wireless microwave, satellite

  3. Twisted Pair Conductor Wire Dielectric Foil Shield Braid Shield Jacket

  4. Shield Twisted-Pair Cable (STP) • covered with a foil shield to reduce interference and crosstalk

  5. Unshield Twisted-Pair (UTP) • does not include any extra shielding around the wire pairs.

  6. Coaxial cable • functionally grouped into • baseband • cable is dedicate for only one channel • broadbandcable can carry several analog signals • (at different frequencies) simultaneously.

  7. light wave. high transmission rate. immune to interference. light weight. Optical Fiber

  8. Using electromagnetic waves. No need physical connection. Appropriate for very long distance 1015 1016 102 Hz 103 104 105 106 107 108 109 1010 1011 1012 1013 1014 Twisted pair Telephone sevice Coaxial cable FM radio and TV Optical fiber AM radio Terrestrial microwave Satellite Infrared Ultraviolet Radio Visible Microwave Wireless Communication

  9. transmission between two ground station distance ?50 km Microwave direct line of sight transmission between two ground stations microwave transmission tower earth

  10. using microwave receive and retransmit using transponder upward transmission (uplink) 4 GHz (12) downward transmission (downlink) 6 GHz (14) Satellites earth Ground Station ground station

  11. Satellite band • C band 4/6 GHz 5.925 - 6.425 GHz uplink 3.7 - 4.2 GHz downlink • KU band 12/14 GHz 14 - 14.5 GHz uplink 11.7 - 12.2 GHz downlink

  12. remains in a fixed position relative to ground station. used for communication purposed. used 3 satellites to cover all over the earth. Geostationary satellite 22,300 miles earth

  13. wireless link between fixed terminal point (base station) and terminal. BS F3 F1 F2 F2 F2 F3 F1 F1 F3 BS F2 F1 F2 F3 Radio Radio field of coverage of base station = Base station = User computer/terminal F1, F2, F3 = Frequencies used in cell

  14. Factor to select media • Cost • Data rate & bandwidth • Distance

  15. Twisted pair coaxial oftical microwave satellite fiber Data rate 1-100 Mbps 10 Mbps 400-500 200-300 1-2 Mbps Mbps Mbps interference electrical electrical immune solid atmospheric condition object distance up to 1 mile 2-3 miles 20-30 20-30 miles miles ( 1-2 Mbps for 1 mile 10 Mbps for 100 m 2.4 kbps for 10 miles ) Comparison of media

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