What’s Different Between Kinds of Computer Networks Transmission Cables and Media?


Computer Networks Media Types

  • Wired media (cables)
    • Copper cables
      • Coaxial cables
      • Twisted pair cables
        • Shielded (STP)/Unshielded (UTP)
    • Fiber optic cables
      • Single mode/Multi-mode
  • Wireless media (Air)


Coaxial Cables

  • High capacity cables
  • Used for video transfer
  • Two types
    • Thick coaxial cable (thicknet)
      • ½ inch diameter
      • 10base5
    • Thin coaxial cable (Thinnet)
      • ¼ inch diameter
      • 10base2
  • Use BNC connector


Shielded Twisted Pair (STP) Cables

  • Protected
  • Hard to install
  • RJ45
  • Crimper Tool


Unshielded Twisted Pair (UTP) Cables

  • Most commonly used type
  • Easy to install
  • Less expensive
  • Electromagnetic interference
  • RJ45 connector
  • Crimper tool


Fiber Optic Cables

  • Faster than twisted pair and coaxial
  • Send data as light pulses over glass medium
  • Free of electromagnetic interference
  • Expensive
  • Hard to install
  • Used in submarine connections
  • More secure
  • Core carries the signals
  • Core made of plastic or glass
  • Cladding maintains the signal in the center of the core as the cable bends
  • Sheathing protects the cladding and the core
  • Advantages
    • Total immune to the EMI
    • Highly resistance to Eavesdropping
    • Support extremely high data transfer rate
    • Allow grater cable distances without repeater
  • Disadvantages
    • Very expensive
    • Difficult to work with


Fiber Optic Cables Modes

  • Single Mode
    • Transfer data through the core using a single light ray
    • The core diameter is around 9 microns
    • Supports a large amount of data
    • Cable length can extended a great distance
  • Multi-mode
    • Transfers the data through the core using multiple light rays
    • The core diameter is around 50 microns
    • Cable length are limited in distance compared to single mode


Wireless Media (Air)

  • WiFi Wireless Fidelity
  • Uses frequencies 2.4GHz or 5Ghz
  • Standards: a,b,g, and n
  • Access Point (AP) connecting devices
  • Mobility
  • Flexibility
  • Less secure
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