Presentation over Wi-Fi technology
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Transcript of Presentation over Wi-Fi technology
CONTENTS
Introduction
Wi-Fi Technologies
Wi-Fi Architecture
Wi-Fi Network Elements
How a Wi-Fi Network Works
Wi-Fi Network Topologies
Wi-Fi Configurations
Applications of Wi-Fi
Advantages/ Disadvantages of Wi-Fi
INTRODUCTION
Wireless Technology is an alternative to Wired
Technology, which is commonly used, for connecting devices
in wireless mode.
Wi-Fi (Wireless Fidelity) is a generic term that refers
to the IEEE 802.11 communications standard for Wireless
Local Area Networks (WLANs).
You don't need a license to set up and operate
a wireless network.
THE Wi-Fi TECHNOLOGY
Wi-Fi Networks use Radio Technologies to transmit &
receive data at high speed :
IEEE 802.11b
IEEE 802.11a
IEEE 802.11g
IEEE 802.11n
IEEE 802.11ac
Wi-Fi Standards Comparison
Wifi
Standards
Appearing
Year
Radio
Frequency
Theoretical
Speed
Actual Speed Range
(feet)
Bandwidth Radio
Technolo
gy used
802.11b Late 1999 2.4 GHz 11 Mbps 4-6 Mbps 100 20 MHz
802.11a 2001 5 GHz 54 Mbps 15-20 Mbps 50 20 MHz
802.11g 2003 2.4 GHz 54 Mbps 22 Mbps 100 20Mhz OfDM
802.11n 2009 2.5 GHz/5 GHz 300 Mbps 130 Mbps 50 20/40 Mhz OFDM/MI
MO
IEEE 802.11ac
Next big standard of WIFI ,
The standard was developed from 2011 through 2013 and
approved in January 2014.
According to a study, devices with the 802.11ac specification are
expected to be common by 2015 with an estimated one billion
spread around the world.
1Gbps speed
Operate on RF bandwidth (up to 160 MHz)
ELEMENTS OF A Wi-Fi NETWORK
Access Point (AP) - The AP is a wireless LAN transceiver
or “base station” that can connect one or many wireless
devices simultaneously to the Internet.
Wi-Fi cards - They accept the wireless signal and relay
information. They can be internal and external.(e.g PCMCIA
Card for Laptop and PCI Card for Desktop PC.)
Safeguards - Firewalls and anti-virus software protect
networks from uninvited users and keep information secure.
HOW A Wi-Fi NETWORK WORKS?
Basic concept is same as Walkie talkies.
A Wi-Fi hotspot is created by installing an access point to
an internet connection.
An access point acts as a base station.
When Wi-Fi enabled device encounters a hotspot the
device can then connect to that network wirelessly.
A single access point can support up to 30 users and can
function within a range of 100 – 150 feet indoors and up to
300 feet outdoors.
Many access points can be connected to each other via
Ethernet cables to create a single large network.
Wi-Fi NETWORK TOPOLOGIES
Topology generally means network shape or structure
AP-based topology (Infrastructure Mode)
Peer-to-peer topology (Ad-hoc Mode)
PEER-TO-PEER TOPOLOGY
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
and easily.
Wi-Fi APPLICATIONS
Home
Small Businesses or SOHO(small office home office)
Large Corporations & Campuses
Health Care
Wireless Internet Service Provider (WISP)
Travellers
ADVANTAGES
Mobility
Easy of Installation & Flexibility
Cheaper on a large scale
Secure
Use unlicensed part of the radio spectrum
Interference
Degradation in performance
Limited range
High power consumption
LIMITATIONS