Wi-Fi Protocols

802.11a

 -> This version operates at 54 Mbps. It is considered as the favorite wireless LAN protocol for IP telephony. The   
     problem with it is distance; beyond 100 feet, you are out of the network.

802.11b

 -> This version operates at 11 Mbps, but the distance of transmission is 300 feet, which is a considerable 
     improvement over its predecessor. This version is used for public hotspots and small campus environments.

802.11g

 -> This version is relatively new and is considered as a high-speed replacement for 802.11b. It works at 54 Mbps



WiMAX Protocols


802.16


 -> IEEE 802.16 is a specification for fixed broadband wireless metropolitan access networks (MANs) that use a 
     point-to-point architecture. The standard defines the use of bandwidth between the licensed 10 GHz and 66 
     GHz and between the 2 GHz and 11 GHz (licensed and unlicensed) frequency ranges and defines MAC layer that 
     supports multiple physical layer specifications customized for the frequency band of use and their associated 
     regulations.