2.3 - Wireless Network Technologies

Question 1

802.11 technologies

Answer 1

• Frequency
  – 2.4 GHz or 5 GHz
  – And sometimes both
• Channels
  – Groups of frequencies, numbered by the IEEE
  – Non-overlapping channels would be ideal
• Regulations
  – Most countries have regulations to
  manage frequency use
  – Spectrum use, power output,
  interference requirements, etc.

Question 2

Bluetooth

Answer 2

• Remove the wires
  – Headsets, speakers, keyboards / mice
• Uses the 2.4 GHz range
  – Unlicensed ISM
  (Industrial, Scientific and Medical) band
  – Same as 802.11
• Short-range
  – Most consumer devices operate
  to about 10 meters
  – Industrial Bluetooth devices can communicate
  over 100 meters

Question 3

Wireless Spectrum Graphic

Answer 3