CIE A Level Physics (9702) 2019-2021

Revision Notes

20.2.2 Advantages & Disadvantages of Different Channels of Communication

Advantages & Disadvantages of Different Channels of Communication

  • Wire-pairs:
    • Low bandwidth (500 kHz)
    • Problems with attenuation, so signal needs to be amplified every 5 km
    • Distorts transmitted radio waves travelling in the wire of different frequencies and speeds due to dispersion
  • Coaxial cables:
    • High security with plastic shielding that protects the core
    • High bandwidth (500 MHz)
    • The amplification needed every 10 km for every MHz and 100 m for every GHz
  • Radio and microwave links:
    • High-frequency waves can be transmitted
    • Medium bandwidth (100 MHz)
    • Reduced attenuation
    • The average distance of 50 km between amplifiers
  • Optic fibres:
    • Negligible cross-linking
    • Less noise than co-axial cables and wire pairs
    • Can transmit high-frequency signals
    • High bandwidth (10 GHz)
    • Low attenuation
    • Amplifications needed only every 80 km
    • Perfect regeneration
    • Very secure with cladding

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