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hey!!!!! everybody dats was simple ppt on mobile computing as u all aware dat d world is not stationary things are getting change technology is rocking all over so lets get into in it
and plz. dont forget to comment on my work weather u lik or not
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hey!!!!! everybody dats was simple ppt on mobile computing as u all aware dat d world is not stationary things are getting change technology is rocking all over so lets get into in it
and plz. dont forget to comment on my work weather u lik or not
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Session Overview
-------------------------------------------
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2. Contents
Introduction
Need of Wi-Fi Technology
Purpose
History
Wi-Fi Technology
How a Wi-Fi Network Works
Topologies & Configurations
Applications
Wi-Fi Security
Advantages & Limitations
Innovations
2
Wi-Fi Technology
3. Introduction
Wireless Technology is an alternative to Wired
Technology, which is commonly used, for connecting
devices in wireless mode.
Wi-Fi is a generic term that refers to the IEEE 802.11
communications standard for Wireless Local Area
Networks (WLANs).
Wi-Fi Network connect computers to each other, to the
internet and to the wired network.
Wi-Fi works on physical and data link layer.
3
Wi-Fi Technology
4. Naming secret
The term Wi-Fi suggests Wireless Fidelity, resembling the
long-established audio-equipment classification term high
fidelity (in use since the 1930s ) or Hi-Fi (used since 1950).
Phil Belanger who is the founding member of the Wi-Fi
Alliance states that term Wi-Fi was never supposed to mean
anything at all.
The “yin-yang” logo indicates the certification of a product for
interoperability.
4
Wi-Fi Technology
9. Purpose
The purpose of Wi-Fi is to hide complexity by enabling
wireless access to applications and data, media and streams.
The main aims of Wi-Fi are:
make access to information easier
ensure compatibility and co-existence of devices
eliminate complex cabling
eliminate switches, adapters, plugs, pins and connectors
9
Wi-Fi Technology
11. Wi-Fi Alliance
Wi-Fi technology builds on IEEE 802.11 standards. The IEEE
develops and publishes these standards, but does not test
equipment for compliance with them. The non-profit Wi-Fi
Alliance formed in 1999 to fill this void.
The Wi-Fi Alliance, a global association of companies.
As of 2009 the Wi-Fi Alliance consisted of more than 300
companies from around the world.
Manufacturers with membership in the Wi-Fi Alliance, whose
products pass the certification process, gain the right to mark
those products with the Wi-Fi logo.
11
Wi-Fi Technology
12. Wireless Landscape
Wireless Technology Transmission Distance Speed
Bluetooth 33 feet 1 Mbps
Satellite Worldwide 290ms latency
1G Analog cellular Nationwide
2G digital cellular Nationwide 14 Kbps
2.5G digital cellular Nationwide 384 Kbps
3G digital cellular Nationwide 2-10 Mbps
WLAN 802.11b 375 feet 11 Mbps
WLAN 802.11a, g 300 feet 54/128 Mbps
Fixed broadband Wireless (BWA) 35 miles 1 Gbps
WAP Nationwide 384 Kbps
WiMAX 802.16, 4G 10 miles 75 Mbps
12
Wi-Fi Technology
13. 2.5 GHz
Service
Wireless Data Networks
Local Wide
Coverage Area
Satellite
DataRates
9.6 Kbps
19.6 Kbps
56 Kbps
1 Mbps
2 Mbps
10 Mbps
50 Mbps
Broadband PCS
Spread
Spectrum
Wireless
LANs
Infrared
Wireless
LANs
Narrow Band Wireless
LANs
Circuit and Packet Data
Cellular, CDPD, Mobitex, DataTac
Narrowband PCS
802.11 is WiFi
WAP is small
handhelds
13
15. The Wi-Fi Technology
The technology used in Wi-Fi is easiest to understand in terms of
radio. It is quite similar to walkie-talkies, the only difference being in
the strength of signals.
An ordinary walkie-talkie can handle only limited data in the range of
1000 bps, and operate at 49 MHz. In the case of Wi-Fi radios, the
signal strength is much more, so they can handle much higher data
rates.
There are three versions of Wi-Fi radios currently available- the ones
that work with,
802.11b
802.11a
802.11g
15
Wi-Fi Technology
16. IEEE 802.11b
Appeared 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.
16
Wi-Fi Technology
17. IEEE 802.11a
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
17
Wi-Fi Technology
18. 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’
18
Wi-Fi Technology
20. Standards
• IEEE 802.11 - The original 1 Mbit/s and 2 Mbit/s, 2.4 GHz RF and IR standard
• IEEE 802.11a - 54 Mbit/s, 5 GHz standard (1999, shipping products in 2001)
• IEEE 802.11b - Enhancements to 802.11 to support 5.5 and 11 Mbit/s (1999)
• IEEE 802.11d - International (country-to-country) roaming extensions
• IEEE 802.11e - Enhancements: QoS, including packet bursting
• IEEE 802.11f - Inter-Access Point Protocol (IAPP)
• IEEE 802.11g - 54 Mbit/s, 2.4 GHz standard (backwards compatible with b) (2003)
• IEEE 802.11h - 5 GHz spectrum
• IEEE 802.11n - Higher throughput improvements
• IEEE 802.11p - Wireless Access for the Vehicular Environment
• IEEE 802.11r - Fast roaming
• IEEE 802.11s - Wireless mesh networking
• IEEE 802.11T - Wireless Performance Prediction (WPP) - test methods and metrics
• IEEE 802.11u - Interworking with non-802 networks (e.g., cellular)
• IEEE 802.11v - Wireless network management
• IEEE 802.11w - Protected Management Frames
20
Wi-Fi Technology
21. 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.
21
Wi-Fi Technology
24. AP-based 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% overlap to allow roaming.
24
Wi-Fi Technology
25. 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.
25
Wi-Fi Technology
26. Point-to-Multipoint bridge
topology
This is used to connect a LAN in one building to LANs in
other buildings even if the buildings are miles apart. These
conditions receive a clear line of sight between buildings.
The line-of-sight range varies based on the type of wireless
bridge and antenna used as well as the environmental
conditions.
26
Wi-Fi Technology
27. Wi-Fi Configurations
Wi-Fi is composed of three main sectors:
Home (individual residences and apartment buildings)
Public (Round about 70,000 “hotspots” through out the world)
Enterprise (corporations, universities, office parks)
27
Wi-Fi Technology
36. Wi-Fi Security
Service Set Identifier (SSID)
Wired Equivalent Privacy (WEP)
Wireless Protected Access (WPA)
IEEE 802.11i
WEP and WPA are encryption protocols that you can choose
from in your router's firmware.
Wi-Fi Protected Access (WPA), a subset of the upcoming
802.11i security standard, will replace the flawed Wired
Equivalent Privacy (WEP).
Without your SSID, people will not be able to join your Wi-Fi
hotspot.
36
Wi-Fi Technology
41. WiFi Phone
A Wi-Fi phone is a wireless
device that gives you the dual
benefits of wireless
connectivity and the cost
savings of VoIP.
From this angle, Wi-Fi phone
looks like the next big thing in
the telecom revolution.
41
Wi-Fi Technology