Video Description

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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