C3

• longitude waves travel/vibrate forwards and backwards
• Bluetooth

  • Bluetooth uses short wavelength radio signals and so does not need a ‘line of sight
  • Bluetooth uses a system of ‘frequency-hopping’ to reduce interference with Wi-Fi as this uses similar frequencies
  • Frequency - hopping limits data loss
• Bluetooth uses radio waves

  advan - connect to more than one device

  disadvan - transmit over short range, low bandwidth
• Infrared

  • Uses a shorter wavelength/higher frequency signal than Bluetooth
  • Used for connecting low powered devices together (i.e. television remote).
  • Advan - does not interfere with other devices, Uses a high frequency so gives better and clearer communications.
  • disadvan - Affected by the direct sunlight, Can only operate over a short distance, •Only works with one device at a time
• Wifi uses radio/microwave waves

  • advan - pass through walls
  • disadvan - uses more power so shorter battery life on connected devices