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Wire Media: UTP

Wire Media: UTP. Unshielded Twisted Pair (UTP) Ordinary copper wire Twisted several times per inch to reduce interference Pair of wires needed for a complete electrical signal Unshielded: nothing but plastic coating No protection from interference. Wire Media: UTP.

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Wire Media: UTP

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  1. Wire Media: UTP • Unshielded Twisted Pair (UTP) • Ordinary copper wire • Twisted several times per inch to reduce interference • Pair of wires needed for a complete electrical signal • Unshielded: nothing but plastic coating • No protection from interference

  2. Wire Media: UTP • Unshielded Twisted Pair (UTP) • Business telephone wiring traditionally comes in 4-pair UTP wire bundles • Used in LAN wiring to use existing building wiring technology

  3. Wire Propagation: RJ-45 • RJ-45 connector terminates a UTP bundle • Slightly wider than RJ-11 residential connector • Width needed for 8 wires

  4. Wire Media: UTP to the Desktop • UTP • Dominant for line from desktop to first hub or switch • Inexpensive to buy and install • Rugged: can take punishment of office work • Easily 100 Mbps, 1 Gbps with careful insulation UTP First Hub or Switch

  5. Wire Media: Optical Fiber • Optical Fiber • Glass core, surrounding glass cladding • Light source turned on/off for 1/0 • Total internal reflection at boundary • Almost no attenuation Cladding Core Light Source Reflection

  6. Wire Media: Optical Fiber • Limited by Distortion • Light entering at different angles travels different distances (different number of reflections) • Called different modes • Light from successive bits becomes mixed over long distances Light Source

  7. Wire Media: Optical Fiber Mod B • Multimode Fiber • Wide core makes easy to splice (50 or 62 microns) • Many angles for rays (modes) • Short propagation distance (usually 200 m to 500 m) Light Source

  8. Wire Media: Optical Fiber • Single Mode Fiber • Narrow core difficult to splice (5 or 8 microns) • Only one angle for rays (one mode), so (almost) no distortion • Longer propagation distance (usually up to 2 km for LAN fiber, longer for long-distance fiber) • Narrow core makes fiber fragile and difficult to splice

  9. Wire Media: Optical Fiber • Optical Fiber • High speeds over long distances • 200 m to 2 km • Costs more than UTP, but worth it on long runs • Good for all links between hubs and switches within and between buildings in a site network Optical Fiber

  10. Wire Media: UTP and Optical Fiber • The emerging pattern: UTP from first hub or switch to desk, Fiber everywhere else on site

  11. Wire Media: Coax • Coaxial Cable • Used in cable TV, VCRs • Central wire, external concentric cylinder • Outer conductor wrapped in PVC Inner Wire Outer Conductor Wrapped in PVC Screw-On Connector

  12. Wire Media: Coaxial Cable • Coaxial Cable • Installed widely today in old 10 Mbps Ethernet LANs • Not being used in new installations • Optical fiber more cost-effective for long links • UTP more cost-effective for desktop links

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