Sidhant ChatterjeeElectronics and Communication1st Year

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.

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.

WI-FI NETWORK TOPOLOGIES…

• AP-based topology (Infrastructure Mode)

• Peer-to-peer topology (Ad-hoc Mode)

• Point-to-multipoint bridge topology

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.

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.

POINT-TO-MULTIPOINT BRIDGE TOPOLOGY

• Use Line -of-Sight

(LoS)strategy.

•Used to connect a

LAN between buildings

which are miles apart.

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.

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

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.

ADVANTAGES AND LIMITATIONS…

• Mobility

• Ease of Installation

• Flexibility

• Cost

• Reliability

• Security

• Use unlicensed part of the radio spectrum

• Roaming

• Speed

•Interference

•Degradation in performance

•High power consumption

•Limited range

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.

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.

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…

Thanking

You…

Sidhant ChatterjeeElectronics and communication

1st year

Comments!!!Questions???