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Physical media

Physical media. Coaxial Twisted pair Fiber optic. Coaxial Cable . Coaxial Cable Types - Bus. Other . Plenum – space between floors

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Physical media

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  1. Physical media • Coaxial • Twisted pair • Fiber optic

  2. Coaxial Cable

  3. Coaxial Cable Types - Bus

  4. Other • Plenum – space between floors • Plenum type cable – demanded by the National Fire Protection Association that cables run within the plenum have been tested and guaranteed as save, that is, thye must be • Fire retardant and create little or no smoke and poisonous gas when burned • RG-59 for TV, RG-6 for TV and cable modems • RG-62 for ARCnet - obsolete

  5. Twisted-Pair Cable

  6. UTP Cable Grades

  7. Connect s • RJ-11 for phone and DSL (Digital Subscriber Link) • RJ-45 for LAN, use a crimper to connect the wires to the connect first

  8. Fiber Optic Cable

  9. The Cores • Can be glass for greater distance, or • Plastic to reduce cost

  10. Single Mode vs. Multimode Fiber • Single mode, single-mode optical fiber (SMF) is an optical fiber designed to carry only a single ray of light (mode) • Multimode fiber optic cable has a large diametral core that allows multiple modes of light to propagate • http://en.wikipedia.org/wiki/Multi-mode_optical_fiber • http://www.multicominc.com/active/manufacturer/multicom/Fiber%20Optics/singlemode-multimode.html

  11. Multimode Fiber

  12. Fiber Optic Cable Types • Singlemode (SMF): Used for wide area networks (WANs) and other long cable runs, glass core, light source is transmitted from end to end and pulsed to communicate, can go up to 40 km • Multimode (MMF): Used for local area networks (LANs) and short cable runs, light is reflected by cladding, core can be either glass or plastic, 1/50 the speed of SMF, 3000 ft distance

  13. Pros and Cons of fiber

  14. Fiber Optic Connectors (SC, ST)

  15. Fiber Optic Connectors – ST and SC • See page 64 (N10 – 00 5 edition) for examples of ST and SC connectors • Fiber cables always need a pair – one for each direction (sending and receiving) • Figure 3.8 a MT-RJ

  16. Serial Cables • RS-232 • USB (Universal Serial Bus) can connect up to 127 devices

  17. Properties of cables • Transmission speed – unit Mbps • Distance UTP – 100 meters • Attenuation – the degradation of signal due to medium “burns” energy • Duplex • Noise Immunity • Frequency • Cat 5e can go 1Gbps for short distance • Cat 6, build for 1Gbps

  18. Wiring Standards • 568A straight –through cable • 568B Crossover cable • Rolled cable • Hardware loopback

  19. 568A straight –through cable

  20. 568B Crossover cable

  21. Rollover – mostly CISCO

  22. Loopback

  23. Wiring Distributions • Vertical • Between floors • Horizontal • Within the same floor

  24. Patch Panels -- inactive

  25. 66 Block • Cannot go over 10 Mbps

  26. Others • MDF/IDE • 25 pair or 100 pair for phone • 110 Block wire distribution point not easy for Cat 6

  27. Demarc • Demarcation – last point of responsibility

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