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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