Wireless Fidelity

1. Wireless Fidelity • Presented By: • NailaHabib Khan

2. Topics • Introduction • Components of Wi-Fi and its working • IEEE 802.11 Architecture • Advantages and Limitations

3. Introduction • What Is WiFi? • The Wi-Fi Alliance • Interoperability • Wi-Fi Technology

4. What Is Wi-Fi? • The term Wi-Fi is often used as a synonym for wireless LAN(WLAN). • A wireless network uses radio waves, just like cell phones, televisions and radios do. • Uses high frequency radio waves rather than wires to communicate between nodes. • Wi-Fi is a generic term that refers to the IEEE 802.11 standard.

5. The Wi-Fi Alliance • A global association of companies, promotes WLAN technology and certifies products if they conform to certain standards of interoperability. • Not every IEEE 802.11-compliant device is submitted for certification to the Wi-Fi Alliance, sometimes because of costs associated with the certification process.

6. Interoperability • It means that products from different companies will work together, so users don't get locked into a single brand of Wi-Fi products. • Wi-Fi Alliance member companies can submit products for certification. • Wi-Fi CERTIFIED products will contain a logo identifying which features have been tested and that the product has met all the standards of the notation.

7. The Wi-Fi Technology

9. Topics • Introduction • Components of Wi-Fi and its working • IEEE 802.11 Architecture • Advantages and Limitations

10. Components of Wifi • Access Point • Hot Spot • Wi-Fi cards • Safe guards

11. Access Point (AP) • The AP is a wireless LAN transceiver or “base station” that can connect one or many wireless devices simultaneously to the Internet.

12. Hot Spot

13. Wi-Fi cards • They accept the wireless signal. They can be internal and external.(e.g PCMCIA Card for Laptop and PCI Card for Desktop PC) Safeguards Firewalls and anti-virus software protect networks from uninvited users and keep information secure

14. How a Wi-Fi Network Works • A Wi-Fi hotspot is created by installing an access point to an internet connection. • When Wi-Fi enabled device encounters a hotspot the device can then connect to that network wirelessly. • A single access point can support up to 30 users and can function within a range of 100 up to 300 feet.

15. Wi-Fi communication • It’s a two-way radio communication. • A computer's wireless adapter translates data into a radio signal and transmits it using an antenna. • A wireless router receives the signal and decodes it. The router sends the information to the Internet using a physical, wired Ethernet connection. • The process also works in reverse….

16. Introduction • Components of Wi-Fi and its working • IEEE 802.11 Architecture • Advantages and Limitations Topics

17. IEEE 802.11 Architecture • BSS • ESS • Station Types

18. Basic Service Set

19. Extended Service Set

20. Station/Node Types • IEEE 802.11 defines three types of stations based on their mobility in a wireless LAN • No transition mobility-Station is stationary or move only inside a BSS • BSS transition mobility-Station can move from one BSS to another but confined inside one ESS • ESS transition mobility-station can move from one ESS to another. How ever there is no guarantee that the communication is continuous during the move.

21. Introduction • Components of Wi-Fi and its working • IEEE 802.11 Architecture • Advantages and Limitations Topics

22. Advantages • Long-Term Cost Savings • Reduced Installation Time • Mobility • Scalability • Easy access to the Internet in public places

23. Limitations OR Disadvantages • Interference • Degradation in performance • High power consumption • Limited range

24. Thank You References www.howstuffworks.com www.wikipedia.com