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MAHARAJA AGRASEN INSTITUTE OF TECHNOLOGY

NEW DELHI

Presentation on

By,Ishmeet Singh Sachdeva

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INDEX•INTRODUTION•PEER TO PEER STRUCTURE TOPOLOGY

•IEEE-802.11G•IEEE-802.11B•IEEE-802.11A

•APPLICATIONS•LIMITATIONS•ADVANTAGES

•HOW IT WORKS

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INTRODUCTION•WIFI- underlying technology of wireless local area networks (WLAN) is based on the IEEE 802.11 specifications. •Wi-Fi was intended to be used for mobile computing devices, such as laptops, in LANs, but is now often used for increasingly more applications, including Internet access, gaming, and basic connectivity of consumer electronics such as televisions and DVD players.

•A person with a Wi-Fi device, such as a computer, telephone, or personal digital assistant (PDA) can connect to the Internet when in proximity of an access point.

•Wi-Fi also allows connectivity in peer-to-peer mode, which enables devices to connect directly with each other. This connectivity mode is useful in consumer electronics and gaming applications.•FUTURE OF WIFI- There are even more standards in development that

will allow Wi-Fi to be used by cars in highways in support of an Intelligent Transportation System to increase safety, gather statistics, and enable mobile commerce (IEEE 802.11p).

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What Is WiFi?

•A wireless network uses radio waves, just like cell phones, televisions and radios do. In fact, communication across a wireless network is a lot like two-way radio communication.•To access this type of connection

one must have wireless adapter on their computers. Wi-Fi provides wireless connectivity by emitting frequencies between 2.4GHz to 5GHz based on the amount of data on the network.

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PEER TO PEER STRUCTURE TOPOLOGY

•AP IS NOT REQUIRED

•IT IS EASY FOR SETTING UP A WIRELESS NETWORK QUICKLY AND EASILY

•CLIENT DEVICES WITHIN A CELL CAN COMMUNICATE DIRECTLY

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How does Wi-Fi work?

•Alike cell phones, a Wi-Fi network makes use of radio waves to transmit information across a network

•The computer should include a wireless adapter that will translate data sent into a radio signal. This same signal will be transmitted, via an antenna, to a decoder known as the router.•Once decoded, the data will be sent to the Internet through a wired Ethernet connection.

•As the wireless network will work as a two-way traffic, the data received from the Internet will also pass through the router to be coded into a radio signal that will be receipted by the computer's wireless adapter.

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IEEE 802.11A

INTRODUCED IN 2001

OPERATES AT 5GHZ LESS POULAR

54Mbps (THEORITICAL SPEED)

15 – 20 Mbps (ACTUAL SPEED)

50 – 75 FEET DISTANCE RANGE

MORE EXPENSIVE

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IEEE-802.11B

•APPEAR IN LATE 1999

•OPERATED AT 2.4 Ghz RADIO SPECTRUM

•11Mbps THEORITICAL SPEED WITHIN 30m RANGE

•4 -6 Mbps ACTUAL SPEED

•100-150 FEET RANGE

•MOST POULAR LESS EXPENSIVE

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IEEE-802.11G

•INTRODUCED IN 2003

•HAS BOTH THE FEATURES OF A AND B

•100 – 150 FEET RANGE

•54Mbps SPEED

•2.4 GHZ RADIO FREQUENCY

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APPLICATIONS

•HOME

•SMALL BUISNESSES OR SOHO

•LARGE CORPORATION AND CAMPUSES

•HEALTH CARE

•WIRELESS ISP

•TRAVELLERS

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LIMITATIONS

•INTERFERENCE

•DEGREDATION IN PERFORMANCE

•HIGH POWER CONSUMPTION

•LIMITED RANGE

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ADVANTAGES

•MOBILITY •EASE OF INSTALLATION•FLEXIBILITY•COST•RELIABILITY•SECURITY •ROAMING•SPEED•USE UNLICENSED PART OF RADIO SPECTRUM