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WIRELESS LAN &WAN

Presented by

ADNAN MUZAFFARREG: 01083-043

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AGENDA

� Introduction

� What is Wireless LAN

� Why Wireless LAN

� How Wireless LAN·s are used in the real world

� Why Wireless LAN

� How Wireless LAN·s are used in the real world

� Types of WLAN

� Security standards

� System Architecture

� Bluetooth

Wireless WAN Why Wireless WAN

Implementation of a WWAN

What is a WWAN?

Advantages of Adopting

How do it work?

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INTRODUCT ION

� Wireless Technology is an alternative to WiredTechnology, which is commonly used, for connectingdevices in wireless mode.

� Wi-Fi (Wireless Fidelity) is a generic term that refersto the IEEE 802.11 communications standard forWireless Local Area Networks (WLANs).

� Wi-Fi Network connect computers to each other, tothe internet and to the wired network.

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WHAT ISWIRELESS LAN

A wireless LAN or WLAN is the linking of more devices

without the use of wires.

WLAN utilizes the modulation technology based on radiowaves to communicate between devices in a limited

network area.

It gives users the mobility to move around within a

broad coverage area & still be connected to the network.

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WHYWIRELESS LAN

Previously Ethernet LANs was used, which was

very costly, messy & movement of those LANs

was difficult. To reduce this problems related to

Wired LANs the concept of Wireless LAN hasevolved.

This is very much cost effective, less messy &

movement of this LANs are very easy because in

this type of LANs, problems related to wires are

removed.

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HOW W IRELESS LAN·S ARE USED IN THE REAL WORLD

Doctors and nurses in hospitals are more

productive because hand-held or notebook

computers with wireless LAN capability deliver

patient information instantly.

Students holding class on a campus greenswardaccess the Internet to consult the catalog of the

Library of Congress

Network managers in dynamic environments

minimize the overhead caused by moves,extensions to networks, and other changes with

wireless LANs.

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T YPES OF WLAN

There are two types of WLAN:-

IEEE 802.11

- 802.11b

- 802.11a

- 802.11g

- 802.11n

Bluetooth

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802.11WIRELESS LAN

Provides network connectivity over wireless media

An Access Point(A P) is installed to act as theBridge between Wireless and Wired network

An A P is connected to wired network and isequipped with antenna to provide wireless

connectivity

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802.11WIRELESS LAN

Range depends on structural hindrances and RF

gain of the antenna at the AccessP

oint. To service larger areas, multiple A Ps may be

installed with 20-30% overlap

A client is always associated with one A P and when

the client moves closer to another A P, it associates

with the new A P.

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IEEE 802.11B

� Appear in late 1999

� Operates at 2.4GHz radio spectrum

� 11 Mbps (theoretical speed) - within 30 m

Range

� 4-6 Mbps (actual speed)

� 100 -150 feet range

� Most popular, Least Expensive� Interference from mobile phones and

Bluetooth devices which can reduce the

transmission speed.

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IEEE 802.11 A

� Introduced in 2001

� Operates at 5 GHz (less popular)

� 54 Mbps (theoretical speed)

� 15-20 Mbps (Actual speed)

� 50-75 feet range

� More expensive

� Not compatible with 802.11b

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IEEE 802.11G

� Introduced in 2003

� Combine the feature of both standards (a,b)

� 100-150 feet range

� 54 Mbps Speed

� 2.4 GHz radio frequencies

� Compatible with ¶b·

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IEEE 802.11N

The 802.11n standard was recently ratified

by the Institute of Electrical and

Electronics Engineers (IEEE), as compared

to the previous three standards. Thoughspecifications may change, it is expected to

allow data transfer rates up to 600Mbps,

and may offer larger ranges.

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SECURITY STANDARDS

WEP (Wired Equivalent Privacy)

WPA (Wi-Fi Protected Access)

802.1x

WPA2/802.11i

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SYSTEM ARCHITECTURE

Two basic system architectures:-

a) Ad hoc

b) Infrastructure based

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AD HOC WIRELESS LANS

A BSS without an A P iscalled as Ad hoc

network.

A group of stations

using the same radio

frequency..

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INFRASTRUCTURE BASED WIRELESS LANS

A BSS with an Access

Point is called anInfrastructure based

network.

Distribution system

connects cells via access

point to form a singlenetwork..

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BLUETOOT H

Short-range wireless LAN technology.

It is an ad hoc network.

It connects the device of different functions.

A bluetooth device has the data rate of 1 Mbpswith a 2.4-GHz bandwidth

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Wireless WAN

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INTRODUCT ION

Wireless Wide Area Networking (WWAN)

using radio, satellite and mobile phone

technologies can both complement andcompete with more traditional systems of

cable-based networking.

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WHY WIRELESS WAN

For some institutions, such as those in rural

areas where laying cable is too expensive,

wireless technology offers the only networking

solution. For others, wireless wide area

networking provides greater system flexibility as

well as the opportunity to control costs where the

equipment is owned.

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IMPLEMENTATION OF A WWAN

Implementing a WWAN requires careful

attention to the planning and surveying of

the network.The total cost of ownership involved in

switching to this rapidly evolving system

of networking should also be considered

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A DV ANTAGES OF A DOPTING

A wireless networking platform often come from

the geographical location of a school, institution

or business

In rural areas, wireless networking can be apositive alternative to laying long and expensive

cable or fiber links.

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HOW DO IT WORK?

All wireless solutions operate by sending signals

in a specific frequency band, a limited natural

resource known as the radio spectrum

The use of spectrum in any country is regulatedby the Radio communications Agency

Which makes sure that resources are used

appropriately

Frequency bands are regulated in different ways:

y Some are license-exempt.

y Some require an individual license.

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REFERENCES

Data communications & Networking(Forouzan)

Term Paper

www.xilinx.com/esp/consumer/home_networking/

pdf_files/wireless_lans/wlan-complete.pdf www.cs.cmu.edu/~prs/wireless09/handouts/L11-

LAN.php3

www.ee.ryerson.ca/~jaseem/pub/L3_WLAN.php

WWW.Google.Com

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T HANK YOU

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