Spectrum:
  • It is the range of electromagnetic radiations and frequency bands used to transmit sound, data, and video across the country.
  • It is what carries voice between cell phones, television shows from broadcasters to your TV, and online information from one computer to the next, wirelessly.
  • Respective countries have their own wireless spectrum with ranges up to 300 GHz.
  • The wireless spectrum frequencies used in communication are regulated by national organizations, which specify which frequency ranges can be used by whom and for which purpose.
  • The wireless technology  has created divisions in spectrum allocation. The International Telecommunications Union (ITU) divides the world into three different regions that influence wireless signal propagation:
  • Region 1 : Europe, Africa, parts of the Middle East and Northern Asia
  • Region 2 : The Americas, Caribbean and Hawaii
  • Region 3 : Asia, Southeast Asia, the Pacific Islands, Australia and New Zealand
     Why we use wireless spectrum:
  • Increased efficiency - Improved communications leads to faster transfer of information within businesses and between partners/customers.
  • You are rarely out of touch - We don't need to carry cables or adaptors in order to access office networks. 
  • Reduced costs - Relative to 'wired', wireless networks are, in most cases, cheaper to install and maintain.  
     Generations of wireless spectrum:
     Audible frequency:
  • An audible frequency or audio frequency is characterized as a periodic vibration whose frequency is audible to the average human. 
  • The generally accepted standard range of audible frequencies for humans is 20 to 20,000 Hz, although the range of frequencies individuals hear is greatly influenced by environmental factors.
  • Some of the common audible frequencies of animals.