2. INTRODUCTION…
Wi-Fi is a mechanism for wirelessly connecting electronic devices. Wi-Fi
networks use radio technologies to transmit and receive data at high
speed.
3. COMPONENTS OF A WI-FI NETWORK…
• Access Point (AP) - A wireless LAN transceiver or base station.
• Wi-Fi cards – Accept the wireless signal and relay information. They can
be internal and external.
• Safeguards - Firewalls and anti-virus software protect networks.
5. AP-BASED TOPOLOGY…
•Communicate through AP.
•BSA-RF coverage provided by an AP.
•ESA-It consists of 2 or more BSA.
•ESA cell includes 10-15% overlap to allow
roaming.
6. PEER-TO-PEER TOPOLOGY
•AP is not required.
•Client devices within a cell
can communicate directly with
each other.
•It is useful for setting up of a
wireless network quickly and
easily.
8. FUNCTIONING OF WI-FI NETWORKS…
• A Wi-Fi hotspot is created by
installing an access point to
an internet connection.
• Wi-Fi enabled device
encounters a hotspot the
device can then connect to
that network wirelessly
• Many access points can be
connected to each other via
Ethernet cables to create a
single large network.
9. CAMPUS WIDE WI-FI SYSTEMS….
• Many traditional college campuses provide at least partial
wireless Wi-Fi Internet coverage
• Results in easy availibility high speed wireless internet access
• Can handle a dense network of peers at a single time
• High cost factor and high data loss risk are some of the drawbacks of wifi
systems…
• In 2000, Drexel University in Philadelphia became the United States's first
major university to offer completely wireless Internet access across its entire
campus.
• Pune was india’s first Wi-Fi city
10. CITY WIDE WIFI SYSTEMS…
In 2005 Sunnyvale, California, became the first
city in the United States to offer city-wide free Wi-
Fi, and Minneapolis has generated $1.2 million in
profit annually for its provider.
In 2004, Mysore became India's first Wi-fi-enabled
city and second in the world after Jerusalem. A
company called WiFiyNet has set up hotspots in
Mysore, covering the complete city and a few
nearby villages.
In May 2010, London, UK, Mayor Boris Johnson
pledged to have London-wide Wi-Fi by
2012.Islington in London already has extensive
outdoor Wi-Fi coverage.
11. ADVANTAGES AND LIMITATIONS…
• Mobility
• Ease of Installation •Interference
• Flexibility •Degradation in performance
• Cost
• Reliability •High power consumption
• Security •Limited range
• Use unlicensed part of the radio spectrum
• Roaming
• Speed
12. THREATS…
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.
13. APPLICATIONS…
High 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.
14. HOPES…
Wireless fidelity a an extreemly new concept that is and will be playing a
crucial role in building a whole new technological aspect of the world.
We feel that this would lead the world in a new era of communication
replacing all types of wired communication with the wireless systems…
15. Thanking
You…
Sidhant Chatterjee
Electronics and communication
1st year
