Wi-Fi Technology

Presented By-

Mynk

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. 

• 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.

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.

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

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.

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.

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. 

•An access point is used to broadcast wireless signals.

•Computers and devices must be equipped with wireless network adapters to detect wireless signals.

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.

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.

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.

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.

Hotspot

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

Applications of Wi-Fi

• Home

• Small Businesses

• Large Corporations

• Universities

• Travellers

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.

Limitations of Wi-Fi

• Interference

• High power consumption

• Limited range

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.

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.

Bluetooth WiFi (a) WiFi (b) WiFi (g) WiMAX

Standard 802.15 802.11a 802.11b 802.11g 802.16

Frequency(GHz)

2.45 5 2.4 2.4 2-66

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

Wireless Technology Comparison Chart