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Transmission Media

Transmission Media. Physical Transmission. UTP (Unshielded Twisted Pair) e.g. CAT5 100 mbps; Coaxial cable Shielded from interference Needs terminator at end of cable Range: Thin-185m, thick-500m Connectors can fail Difficult to install but highly resistant to signal interference.

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Transmission Media

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  1. Transmission Media Physical Transmission • UTP (Unshielded Twisted Pair) e.g. CAT5 100 mbps; • Coaxial cable • Shielded from interference • Needs terminator at end of cable • Range: Thin-185m, thick-500m • Connectors can fail • Difficult to install but highly resistant to signal interference

  2. Transmission Media Physical Transmission • Made of glass • Optical, not electrical – little signal fade and no danger of sparks in hostile environments • Multiple signals on a single fibre • Resists EMI • Fibre-optic cable

  3. Transmission Media • Physical Transmission, Fibre-optic cable • Core is as thin as a human hair • Not very flexible – needs thick coat • VERY fast • VERY high bandwidth • Very secure (can’t be tapped or snooped) • VERY long distance (2km without repeaters) • Light weight, small size • Expensive adaptors to convert digital <> electrical signals

  4. Transmission Media • Wireless Transmission, Includes use of: • Radio waves • Microwaves • Satellite and • Infra-red waves

  5. Transmission Media • Wireless Transmission, Radio waves • Radio waves, either long or short distances • Requires transmitter and receiver • Wi-Fi networks use radio waves

  6. Transmission Media • Wireless Transmission, Radio waves • Wi-Fi networks use radio waves • Data is transmitted as radio signals between wireless NICs and base stations • relatively short distances (e.g. 80m-200m), reduced by obstacles • speeds are increasing – now about 11Mbps • encrypted communications to prevent eavesdropping • many PCs can connect to a base station • PCs can “roam” and will automatically connect to the base station that has the strongest signal

  7. Transmission Media • Wireless Transmission, Radio waves • Bluetooth, short range radio waves • Maximum distance 10 mtrs • Data transfer rate of 2mbps c/f wireless 54mbps • Good for use with hand-held devices, eg. PDA’s

  8. Transmission Media • Wireless Transmission: Microwave • Use microwave stations to transmit data as high frequency radio signals from one microwave station to another • B/c microwaves travel in straight line, stations must be located relatively close together, (<50kms) & on top of mountains or buildings • Handles high data rates over short distances

  9. Transmission Media • Wireless Transmission: Satellite • Satellite transmission either in form of radio waves or microwaves • Satellite receives microwave signals from earth & transmits them back to earth stations • They stay in same orbit • More Expensive • Speed of downloading from internet faster than uploading

  10. Transmission Media • Wireless Transmission: Infra-red • Uses light waves and requires line-of-sight access • Effective over short distances, up to 5 metres • Slow data transfer c/f cable

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