Wi-FiPresented By-

Indu Kumari

Manoranjan Paul Nalinaksh Tripathi

Ranjit Nayak Saurabh Kumar Soni

Wifi’ What it stands for?

“Wi-fi suggests Wireless-Fidelity, compared with the long established audio recording term High Fidelity or Hi-Fi.” Wi-Fi is simply a trademarked term meaning IEEE 802.11x.

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When Wi-Fi Originated ?

• The precursor to wi-fi was invented in 1991 by NCR Corporation in Nieuwegein, the Netherland.

• 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 has been named as father of “Wi-Fi’’.

How Wi-Fi Works?

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What a wireless network is made up of:

Wireless Network cards

- Radios which send and receive signals from other radios or access points, usually PCMCIA* cards which fit into Laptop expansion slots, or PCI Bus in case of Desktop computers. (There are other, simpler options using USB). PDAs like Blackberry, and Pocket PC having a compact flash slot can also connect.

* PCMCIA – Personal Computer Memory Card International Association.

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What a wireless network is made up of:

Base stations, Access points, or Gateways

- The base station sends and receives radio signals to and from the Wi-Fi radio in your laptop or PC, enabling you to share your Internet connection with other users on the network. Access points and gateways have a wide range of features and performance capabilities, but they all provide this basic network connection service.

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Typical Community Wifi ConstituentsHigh gain Parabolic grid antennas to beam the signal to over 30km from tower to tower..

Customer Premises equipment (CPE) to access the signal from the towers..

Sector antennas to beam the signal from the towers to the community users

Other components that need to be installed in order to put the above systems together

About Radio Frequency• There is no wire connection between

sender and receiver.• Two types of RF is used-• 1-direct sequence spread spectrum radio

technology.• 2-orthogonal frequency division

multiplexing.

Advantages of Wi-Fi

• Wi-fi can make access publicly available at wi-fi hotspots.

• Does not require regulatory approval for individual.

• Wi-fi network can support roaming.• Wi-fi allows local area network to deployed

without wires for client devices.

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 has been shown to be using breakable even when correctly configured.

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Capabilities and UsesHigh data transmission rate and high reliability in all weather conditions, and an always available (95% Uptime) network makes wifi a robust solution suitable for high bandwidth applications….

- Online video-conferencing with greater clarity-Telephony, using VoIP- Revenue-model for budding start-up ISPs- Broadband in the true sense- Easier reach into far-flung rural areas- Ability to add more nodes as and when required- Less maintenance overheads, especially in Rural

areas where technical manpower is scarce.

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References…

• www.wikipedia.org• http://www.webopedia.com/TERM/W/

Wi_Fi.html• http://www.computerworld.com.au/

article/300310/csiro_settles_wireless_battle