Beginners Guide To Wi-Fi Technology Third Year Diploma In Computer Engineering

1. WIRELESS FIDELITY

2. Wi-Fi (Wireless Fidelity)
WI-FI TECHNOLOGY DEVELOPED
WiFi was invented and first released for consumers in
1997 when a committee called IEEE 802.11 was
created. This lead to the creation of IEEE802.
11,.( IEEE stands for the Institute of Electrical and
Electronics Engineers.) which refers to a set of
standards that define communication for wireless
local area networks (WLANs)
FATHER OF Wi-Fi
Victor "Vic" Hayes (born July 31, 1941 Surabaya, Dutch
East Indies) is a former Senior Research Fellow at the
Delft University of Technology. His role in establishing
and chairing the IEEE 802.11 Standards Working Group
for Wireless Local Area Networks has led to him being
referred to by some as the "Father of Wi-Fi".

3. 802.11 - 1997
802.11b - 1999
802.11a - 1999
802.11g - 2003
Wi-Fi STANDARDS
Wi-Fi Generations
Wi-Fi 4 (802.11n) - 2008
Wi-Fi 5 (802.11ac) - 2014

4. Name Developed Year Speed Frequency Notes
802.11 1997 1 to 2 Mbit/s 2.4 GHz commonly used for local area
networking of devices and Internet
access,
802.11b 1999 1 to 11 Mbit/s 2.4 GHz Most popular and Least expensive
802.11a 1999 54 Mbps is the
maximum, but
usually 6 to 24
Mbps
5 GHz Not compatible with b or g networks.
This is one of the oldest standards,
but still in use by many devices today.
802.11g 2003 6 to 54 Mbit/s 2.4 GHz The most popular network type.
Compatible with ‘b’. Combine the
feature of both a,b.
802.11n 2008 72 to 600 Mbit/s 2.4 and 5 GHz Adding multiple-input,multiple-
output antennas.Operates on both
2.5 and 5 GHz bands.
802.11ac 2014 433 to 6933 Mbit/s 5 GHz

5. How A Wi-Fi Network works
Basic Concept Is same As Walkie-Talkies.
When Wi-Fi enabled device encounters a hotspot the
device can then connect to that network wirelessly.
An access point acts as a base station.
A Wi-Fi Hotspot is Created by installing an access
point to an internet conection.
A single access point can support up to 30 users and
can function within a range of 100 up to 300 feet.
Many access points can be connected to each other
via ethernet cables to create a single large network.

6. Wi-Fi Network Topologies
AP Based Topology
(Infrastructure Networks)
Peer-To-Peer Topology
(Ad-Hoc Mode)
Point-To-Multipoint Bridge Topology
• The client communicate
through access point.
• BSA-RF coverage provided by
an AP.
• ESA-It consists of 2 or more
BSA.
• ESA cell includes 10-15%
.
This is used to connect a LAN in one
building to a LANs in other buildings
even if the buildings are miles apart.
these conditions receive a clear line of
sight between buildings.
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 an easily.

7. ADVANTAGES
Cost Reliability Security
Roaming Speed Use unlicensed part of
the radio spectrum
Mobility Flexibility Easy to installation

8. LIMITATIONS OR DISADVANTAGES
Limited range High power consumption
Interference Degradation in performance

9. CONCLUSION
Wi-Fi provides freedom:
freedo, to physically move
around your home or
business and still stay
concted to the internet or
local network.freedom to
grow and move an office
and business without having
to install new cables and
wires , freedom to be
connected while travelling

10. THANK YOU