5Wifi What is the wifi? Wireless fidelity ( wifi). History : it is invented in 1991 by NCR corporation. it is used for cashier system. Its name was WaveLan with speed 1-2Mbps.
6Who invented wifi?The father of wifi is Vic Hayes.
7Wifi refers to a type of Ethernet specified under the IEEE 802 Wifi refers to a type of Ethernet specified under the IEEE a and b standards for LANs operating in the 5 – 2.4 GHz unlicensed frequency bands respectively.
8How does it work ?WiFi uses radio waves to transmit the information to and from the internet or your computer network. When a website wants to communicate with your computer it sends the information to your modem as it does now on your wired connection, then the information is passed on to a wireless router, which then converts it to radio waves and beams it to your computer.
9What are WiFi Hotspots?Hotspots are areas where WiFi radio signals can be picked up by your computer. At home, a wireless router (such as the one shown at right) does the job to make your entire home a hotspot.
11wimaxWhat is the wimax ?Worldwide interoperability for microwave access (WiMAX).Definition.
12Goal of wimaxProvide high speed internet access to home and business subscriber.
13How does it work ? Infrastructure: 1 access point 2 base station (BS) 3 subscribers stations( SS)
14Tower (BS): similar to a cell phone tower Tower (BS): similar to a cell phone tower. Can provide to coverage to a very large area( km).A wimax receiver: the receiver and antenna could be small box or PCMCIA card or could be built in a laptop.
15During communication all information come from SS to the BS and retransmit to the right SS.
16Comparing Range and data rate : Wi-Fi : around 30 meters. WiMAX : In theory 112 Km.expected value : 2 Km. ( under conditions).Wi-Fi : around 54 Mbit.WiMAX : In theory 70 Mbit.expected value : 10 Mbit.