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Media Of Communication Part 2


Unguided Media
Unguided media transport electromagnetic wave without using a physical connection. This type of communication referred as wireless communication.
We can divided wireless transmission in :-
  1.Radio Wave:- Electromagnetic  waves ranging in frequencies between 3KHz and 1GHz are normally called radio wave.
  On radio wave connectivity used communication used Bluetooth, Wi-Fi, etc.
  •    Bluetooth:- It is a wireless network connectivity that enables to connect or transfer data between devices over a short range the physical range of connection up to 100 meter. Ex- Mobile phone, barcode scanning, portable speaker, wireless keyboard, mouse etc.
  •     Wi-Fi (Wireless Fidelity):- Wi-Fi is a network of wireless connection. Wi-Fi network establish by radio frequency like Bluetooth, but has more power, resulting a strong connection.

   · Wi-Fi is also called wireless Ethernet. It has connectivity range up to 150 metres.
  •   Wi-Max:- Wi-max stands for worldwide interoperability for Microwave Access. It is a type of telecommunication technology that provides wireless transmission form multi-point links to portable and fully mobile internet Access. Whose range up to 50km. and speed up to 3mbps.

  2.Microwave:- Electromagnetic waves having frequencies between 1 and 300Ghz are called microwave. Microwaves are unidirectional. It is very useful when unicast (one to one) communication is needed.
Ex- Cellular phones, Satellite network and wireless LAN.
  3.Infrared waves:- Infrared waves, with frequencies from 300 GHz to 400 THz. Can be used for short range communication. It is necessary to place two infrared devices within a few feet for them. It can work only in the direct “Light of sight”.
Ex- IR Remotes, motion sensors etc.

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