Wireless Technologies & the Moders Organaization ..

1] * The new wireless devices have different capabilities such as:

. Cellular telephoney              . Wi-fi                 . Digital camera
. Bluetooth                               . GPS                  . Organizer
. Calculator ...


2] * Microwave transmission systems : For high-volume, long distance, point-to-point communication. 


* Communication satellite :

   . Geostationary earth orbit.

   . Medium earth orbit

   . Low earth orbit


* Radio transmission : Sends data directly between transmitters & recievers using radio-wave frequencies.

* Infrared light : A red light not commonly visible to human eyes.



3] * Wireless networks & distance ..

Short-range ..

Medium range --> Wireless Fidelity (Wi-Fi) , Mesh network which uses multiple WI-Fi access points to creat a wide-area network.

Wide area --> Include cellular radio & wireless broadband or WiMAX.



4] * Mobile computing & commerce ..

. Mobile computing: A computing model designed for people who travel frequently.

. Mobile commerce: Any e-commerce conducted in a wireless environment.

* M-commerce applications :

  . Banking
  . Wireless payments
  . Micropayments
  . Wireless wallets
  . Bill payment services


5] * Major threats to wireless networks:

1. Rouge access points.

2. Eaves-dropping.

3. War driving.

4. Radio-frequency jamming.

 

 

End of Chapter ..