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Transcript

  • 1. Transmission Media(Cable)
    • Prepared By:
    • Devang Bhatti
  • 2. Transmission Cable Types
    • Co – Axial Cable
    • Twisted Pair Cable
    • Fiber Optic Cable
  • 3. Co- Axial Cable
    • Characteristics of co-axial cable:
    • Used in the first Ethernet networks
    • Usually orange/black
    • Very expensive and heavy cable
    • Conductor down the center
    • Insulator surrounds conductor
    • Shielded mesh serves as outside
  • 4. Coaxial cable connector
    • The most common type of connector used with coaxial cables is the BNC connector
  • 5. Coaxial cable connector (Cont…)
  • 6. Coaxial cable applications
    • Most versatile medium
    • Television distribution
      • Cable TV
    • Long distance telephone transmission
      • Can carry 10,000 voice calls simultaneously
      • Being replaced by fiber optic
    • Short distance computer systems links
    • Local area networks
  • 7. Twisted Pair Cable
    • Twisted Pair Cable consists of two copper wires, usually twisted around each other to cancel out any noise in the circuit
    • Two main type of Twisted Pair Cabling
      • Unshielded Twisted Pair (UTP)
      • Shielded Twisted Pair (STP)
  • 8. Twisted Pair Cable
    • Unshielded Twisted Pair (UTP)
      • Ordinary telephone wire
      • Cheapest
      • Easiest to install
      • Suffers from external EM interference
    • Shielded Twisted Pair (STP)
      • Metal braid or sheathing that reduces interference
      • More expensive
      • Harder to handle (thick, heavy)
  • 9. Unshielded Twisted Pair (UTP)
    • UTP has four pairs of wires inside the jacket
    • Each pair is twisted with a different number of twists per inch to help eliminate interference from adjacent pairs
  • 10. UTP Categories
    • Cat 3
      • up to 16MHz
      • Voice grade found in most offices
      • Twist length of 7.5 cm to 10 cm
    • Cat 4
      • up to 20 MHz
    • Cat 5
      • up to 100MHz
      • Commonly pre-installed in new office buildings
      • Twist length 0.6 cm to 0.85 cm
    • Cat 5E
    • Cat 6
    • Cat 7
  • 11. UTP connector
  • 12. Shielded Twisted Pair (STP)
    • STP is the original media used for token ring networks
    • STP can be used for high-speed networks, ATM, where shielding is important.
  • 13. STP connector
  • 14. Fiber Optic Cable
  • 15. Fiber Optic Cable
    • Fiber optic cabling consists of a center glass core surrounded by several layers of protective materials
    • It transmits light rather than electronic signals
    • It is the standard for connecting networks between buildings, due to its immunity to the effects of moisture and light
  • 16. Fiber Optic Cable (Cont…)
    • Fiber optic cable has the ability to transmit signals over much longer distances than coaxial or twisted pair
    • It can also carry information at vastly greater speeds
    • Fiber optic cable is more difficult to install than other cabling
  • 17. Advantages/Disadvantages of Optical Fiber
    • Advantages
      • Noise resistance
      • Less signal attenuation
      • Higher bandwidth
    • Disadvantages
      • Cost
      • Installation/Maintenance
      • fragility