1. Wi-Fi Technology
Presented By-
Mynk

2. What is Wi-Fi?
• Wi-Fi stands for Wireless-Fidelity.
• Wi-Fi is a popular technology that allows
an electronic device to exchange
data wirelessly (using radio waves) over
a computer network, including high-speed
Internet connections.

3. • Wi-Fi is simply a trademarked term meaning
IEEE 802.11x.
• Wi-Fi Network connect computers to each
other, to the internet and to the wired network.

4. Origin of Wi-Fi
• Wi-Fi was invented in 1991 by NCR
Corporation/AT&T in Nieuwegein, the
Netherlands.
• The first wireless products were brought
on the market under the name WaveLAN
with speeds of 1 Mbit/s to 2 Mbit/s.
• Vic Hayes is known as father of Wi-Fi.

5. About Radio Technology
Wi-Fi networks use Radio Technologies to
transmit and receive data at high speed:
• IEEE 802.11b
• IEEE 802.11a
• IEEE 802.11g

6. Range of Wi-Fi
• 802.11b and 802.11g Wireless Access
Points (WAP) support a range of up to 150
feet (46 m) indoors and 300 feet (92 m)
outdoors.
• Range of 802.11a is approximately one-
third that of 802.11b/g.

7. Speed of Wi-Fi
• Official speeds of 802.11b, 802.11g,
and 802.11n networks are 11, 54, and 270
megabits per second (Mbps) respectively.

8. How Wi-Fi works?
• Wi-Fi works by using radio frequency
(RF) technology.
• When an RF current is supplied to an
antenna, an electromagnetic field is
created that then is able to propagate
through space.

9. •An access point is used to broadcast
wireless signals.
•Computers and devices must be equipped
with wireless network adapters to detect
wireless signals.

10. What are the elements of a
wireless network?
Wireless Network Cards
• Radios which send and receive signals
from other radios or access points, usually
PCMCIA which fits into Laptop expansion
slots, or PCI bus in case of Desktop
computers.

11. Base Stations, Access points, or
gateways
•The base station sends and receives radio
signals to and from the wi-fi radio in your
laptop or PC, enabling you to share your
internet connection with other users on the
network.
• Access points and gateways provide basic
network connection service.

12. Community Wi-Fi Constituents
High gain Parabolic Grid Antennas
to beam the signal to over
30KM from tower to tower.
Sector antennas to beam the
signal from the towers to the
community users.

13. Customer Premises
Equipment (CPE) to access
the signals from the towers.
Other components that need
to be installed in order to put
the above components
together.

14. Hotspot
A hotspot is a venue that offers Wi-Fi
access.

15. Applications of Wi-Fi
• Home
• Small Businesses
• Large Corporations
• Universities
• Travellers

16. Advantages of Wi-Fi
• Wi-Fi can make access publicly available
at wi-fi hotspots.
• Does not require regulatory approval for
individuals.
• Wi-Fi network can support roaming.
• Wi-Fi eliminate cabling and wiring.
• Wi-Fi is cheap.

17. Limitations of Wi-Fi
• Interference
• High power consumption
• Limited range

18. Threats of security
• 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 (WEP) has been
shown to be breakable even when
correctly configured.

19. Uses of Wi-Fi
• Online video conferencing with greater
clarity.
• Broadband in the true sense.
• Easier reach into far-flung rural areas.
• Ability to add more nodes as and when
required.

20. Wireless Technology Comparison Chart
Bluetooth WiFi (a) WiFi (b) WiFi (g) WiMAX
Standard 802.15 802.11a 802.11b 802.11g 802.16
Frequency 2.45 5 2.4 2.4 2-66
(GHz)
Speed (Mbps) 0.72 54 11 54 80
Range 10m 50m 100m 100m 50km
Advantages Low Cost Speed Low Cost Speed Speed, Range
Disadvantages Range Cost Speed Cost Cost