2. Presentation on
By,
Ishmeet Singh Sachdeva

3. •INTRODUTION
•PEER TO PEER STRUCTURE
TOPOLOGY
•HOW IT WORKS
•IEEE-802.11A
•IEEE-802.11B
•IEEE-802.11G
•APPLICATIONS
•LIMITATIONS
•ADVANTAGES
3

4. 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).
4

5. •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.
5

6. •AP IS NOT REQUIRED
•CLIENT DEVICES
WITHIN A CELL CAN
COMMUNICATE
DIRECTLY
•IT IS EASY FOR SETTING
UP A WIRELESS NETWORK
QUICKLY AND EASILY
6

7. •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.
7

8.  INTRODUCED IN 2001
 OPERATES AT 5GHZ LESS POULAR
 54Mbps (THEORITICAL SPEED)
 15 – 20 Mbps (ACTUAL SPEED)
 50 – 75 FEET DISTANCE RANGE
 MORE EXPENSIVE
8

9. •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
9

10. •INTRODUCED IN 2003
•HAS BOTH THE FEATURES OF A AND B
•100 – 150 FEET RANGE
•54Mbps SPEED
•2.4 GHZ RADIO FREQUENCY
10

11. •HOME
•SMALL BUISNESSES OR SOHO
•LARGE CORPORATION AND CAMPUSES
•HEALTH CARE
•WIRELESS ISP
•TRAVELLERS
11

12. •INTERFERENCE
•DEGREDATION IN PERFORMANCE
•HIGH POWER CONSUMPTION
•LIMITED RANGE
12

13. •MOBILITY
•EASE OF INSTALLATION
•FLEXIBILITY
•COST
•RELIABILITY
•SECURITY
•ROAMING
•SPEED
•USE UNLICENSED PART OF RADIO
SPECTRUM
13