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Wi fi


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  •   Frequency range of Radio waves:3x10 3 Hz  to 3x10 11 Hz
  • In a best-case scenario you’ll get roughly one-third of the advertised performance.
  • Wi-Fi works with no physical wired connection between sender and receiver by using radio frequency ( RF ) technology, a frequency within the electromagnetic spectrum associated with radio wave propagation. When a RF current is supplied to an antenna, an electromagnetic field is created that then is able to propagate through space. The cornerstone of any wireless network is an access point ( AP ). The primary job of an access point is to broadcast a wireless signal  that computers can detect and "tune" into. In order to connect to an access point and join a wireless network, computers and devices must be equipped with wireless network adapters .
  • PCI bus is a computer bus for attaching hardware devices in a computer. Devices connected to the bus appear to the processor to be connected directly to the processor bus.
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    • 1. Wi-Fi Technology Presented By- Mynk
    • 2. What is Wi-Fi?• Wi-Fi stands for Wireless-Fidelity.• Wi-Fi is a popular technology that allows an electronic device to exchange data wirelessly (using radio waves) over a computer network, including high-speed Internet connections.
    • 3. • Wi-Fi is simply a trademarked term meaningIEEE 802.11x.• Wi-Fi Network connect computers to eachother, to the internet and to the wired network.
    • 4. Origin of Wi-Fi• Wi-Fi was invented in 1991 by NCR Corporation/AT&T in Nieuwegein, the Netherlands.• The first wireless products were brought on the market under the name WaveLAN with speeds of 1 Mbit/s to 2 Mbit/s.• Vic Hayes is known as father of Wi-Fi.
    • 5. About Radio Technology Wi-Fi networks use Radio Technologies to transmit and receive data at high speed:• IEEE 802.11b• IEEE 802.11a• IEEE 802.11g
    • 6. Range of Wi-Fi• 802.11b and 802.11g Wireless Access Points (WAP) support a range of up to 150 feet (46 m) indoors and 300 feet (92 m) outdoors.• Range of 802.11a is approximately one- third that of 802.11b/g.
    • 7. Speed of Wi-Fi• Official speeds of 802.11b, 802.11g, and 802.11n networks are 11, 54, and 270 megabits per second (Mbps) respectively.
    • 8. How Wi-Fi works?• Wi-Fi works by using radio frequency (RF) technology.• When an RF current is supplied to an antenna, an electromagnetic field is created that then is able to propagate through space.
    • 9. •An access point is used to broadcastwireless signals.•Computers and devices must be equippedwith wireless network adapters to detectwireless signals.
    • 10. What are the elements of a wireless network? Wireless Network Cards• Radios which send and receive signals from other radios or access points, usually PCMCIA which fits into Laptop expansion slots, or PCI bus in case of Desktop computers.
    • 11. Base Stations, Access points, orgateways•The base station sends and receives radiosignals to and from the wi-fi radio in yourlaptop or PC, enabling you to share yourinternet connection with other users on thenetwork.• Access points and gateways provide basicnetwork connection service.
    • 12. Community Wi-Fi Constituents High gain Parabolic Grid Antennas to beam the signal to over 30KM from tower to tower. Sector antennas to beam the signal from the towers to the community users.
    • 13. Customer PremisesEquipment (CPE) to accessthe signals from the towers.Other components that needto be installed in order to putthe above componentstogether.
    • 14. HotspotA hotspot is a venue that offers Wi-Fiaccess.
    • 15. Applications of Wi-Fi• Home• Small Businesses• Large Corporations• Universities• Travellers
    • 16. Advantages of Wi-Fi• Wi-Fi can make access publicly available at wi-fi hotspots.• Does not require regulatory approval for individuals.• Wi-Fi network can support roaming.• Wi-Fi eliminate cabling and wiring.• Wi-Fi is cheap.
    • 17. Limitations of Wi-Fi• Interference• High power consumption• Limited range
    • 18. Threats of security• Wi-Fi works with no physical wired connection between sender and receiver by using radio frequency. The most common wireless encryption standards, Wired Equivalent Privacy (WEP) has been shown to be breakable even when correctly configured.
    • 19. Uses of Wi-Fi• Online video conferencing with greater clarity.• Broadband in the true sense.• Easier reach into far-flung rural areas.• Ability to add more nodes as and when required.
    • 20. Wireless Technology Comparison Chart Bluetooth WiFi (a) WiFi (b) WiFi (g) WiMAXStandard 802.15 802.11a 802.11b 802.11g 802.16Frequency 2.45 5 2.4 2.4 2-66(GHz)Speed (Mbps) 0.72 54 11 54 80Range 10m 50m 100m 100m 50kmAdvantages Low Cost Speed Low Cost Speed Speed, RangeDisadvantages Range Cost Speed Cost Cost