Topic:- World Without Wires-
Presented By :-Akshay N Mahajan
World Without Wires
Fi Prepared ByPrepared By:
Akshay N Mahajan (5Akshay N Mahajan (5thth
It’s not HI-FI !!!
Overview of Wi-Fi
Types of Wi-Fi Technology
Major Components of a Wi-
• Wi-Fi Radios
• Access Points
How Does Access Point Work?
• Virtual Private Network
• Media Access Control Filtering
Benefits of Wi-Fi
Future of Wi-Fi
What is Wi-Fi?
Wi-Fi is the commercial name given to the
IEEE 802.11b communications standard for
Wireless Local Area Networks (WLANs).
Wi-Fi allows you to connect to the Internet
from an airport or coffee shop, or retrieving
files or presentations from the corporate
network or sending instant messages to co-
workers while sitting in a conference room at
work without wires.
Types of Wi-Fi technology
802.11a – It provides speed up to 54
Mbps in the 5GHz band.
802.11b (also referred to as 802.11
High Rate or Wi Fi) – It provides 11
Mbps transmission in the 2.4 GHz band.
802.11g – It provides 20+ Mbps in the
2.4 GHz band
Major Components of Wi-Fi
Types of Wi-Fi Radios
PC Card Radio - Many laptop
computers and mobile
computing devices come with
a Wi-Fi radio built in. For
most other laptops you will
insert a Wi-Fi radio
embedded in a simple PCMCIA
card, commonly called a PC
Card, into the laptop's
USB Radio - Most vendors
don't provide slots for PC
Cards, so the simplest method
is to use a USB Wi-Fi radio
that plugs into an available
USB port on your desktop
computer. Install the
software and you're up and
Access point - a
hardware device that
serves as a hub to
provide a wireless
connection to a wireless-
Currently have range of
up to 300 feet.
Unlike hardware solutions, Software access
points have extensive configuration
flexibility but may not offer the full range of
wireless features defined in the 802.11
Fig.2 Software Access PointFig.1 Hardware Access Point
How do Access Points work?
The base station sends
and receives radio
signals to and from the
Wi-Fi radio in your
laptop or PC, through
access point enabling
you to share your
with other users on
Fig.3 Working of Access
Multiple access points or extension points can be
used which extend the range of a single access point.
A user can move from Area 1 to Area 2
transparently making use of the concept of roaming
VPN - Works by creating a secure virtual
"tunnel" from the end-user's computer
through the end-user's access point or
gateway, through the Internet, all the way
to the corporation's servers and systems.
Fig.6 Virtual Private
Firewalls - Firewalls can
make your network appear
invisible to the Internet,
and they can block
unauthorized and unwanted
users from accessing your
files and systems.
MAC Filtering - Every Wi-Fi radio has its unique MAC
number. Wi-Fi access points are programmed to accept only
certain MAC addresses and filter out all others.
RADIUS - RADIUS is a user name and password scheme
that enables only approved users to access the network; it
does not affect or encrypt data.
Benefits of Wi-Fi
Wi-Fi can become one of the main enablers
to the vision of omnipresent computing.
Wi-Fi is one of the leading candidates to
bring Internet access to new environments
that were previously limited by the cost of
physically connecting through cables.
If you don't want to have each computer
on the network all the time, you can save
money by sharing the PC Cards or the USB
radio/adaptors for your laptops and other
mobile computing devices.
Bluetooth has a shorter range restricted to
just 10 meters (40 feet) & maximum data
transfer capacity is around 1 Mbps.
Bluetooth seems to be the king in the very
Bluetooth is just a cable replacement and
not a real technology like Wi-Fi.
3G has strong qualities in truly Mobile
connectivity, but at a high cost and low data
Wi-Fi’s strengths are
speed & range, which
makes it well suited to
Bluetooth’s low power
consumption makes it
great for mobile devices.
Bluetooth is for wireless
point to point connections
& Wi-Fi is for wireless
network connectionsFig.7 Comparison of Wi-Fi,
Bluetooth and 3G
And Lastly…The Inference
As a concluding note it is important for us
to know that getting a secure network with
fast processes is necessary irrespective of
the technology implemented. Wi-Fi not only
allows us to send and receive data or surf
the net from out of the office or while
waiting for a flight at the airport, at a
coffee shop , while holidaying at a resort ,
but also is cost effective as the wiring costs
are saved !
Thus, the best thing of all Wi-Fi is fast. In
fact its several times faster than the
fastest cable-modem connection.
Magazines and Books
Electronics for you, monthly magazine on
Data Communication and Networking, B.A. Forouzan
Commputer Networks, Andrew S. Tanenbaum
Websites referred to
Hope that everyone present here agrees
that Wi-FiWi-Fi is no longeris no longer Hi-Hi-
Thank YouThank You