8/6/2019 (WLAN &WWAN )) http://slidepdf.com/reader/full/wlan-wwan- 1/28 WIRELESS LAN &WAN Presented by ADNAN MUZAFFAR REG: 01083-043 1
8/6/2019 (WLAN &WWAN ))
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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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