Date post: | 27-May-2015 |
Category: |
Technology |
Upload: | ssandarsh |
View: | 391 times |
Download: | 2 times |
Wi –Fi
Presented by:
SANDARSH SETHI
Definition:
Uses radio waves to provide Wireless High-speed Internet
Defines Wi-Fi as any "Wireless Local Area Network (WLAN) products that are based on the Institute of Electrical and Electronics Engineers' (IEEE) 802.11 standards."
Trade mark:
• Uses radio waves to send signals to various devices.
• Convert the data into machine language
• Allows data to be sent very quickly
Working:
WiFi Hotspots:
Physical location that offers internet access over a wireless LAN
Found in coffee shops, hotels,
airports etc.
Types of hotspots:
Free hotspots
Commercial hotspots
Free hotspots:
Uses open public network
Wi-Fi router required
No control on router
Commercial hotspots:
Monthly or yearly subscription required
Any mode of payment could be used
May allow free access to certain sites
Travel netcon, esperto wireless are commercial hotspot provider companies
Wi –Fi Reach:
Wi-Fi networks have limited range.
Typical wireless router using 802.11b or 802.11g have a range of 32 m indoors and 95 m outdoors.
New IEEE 802.11n can exceed that range by more than double.
Wi-Fi in the 2.4 GHz frequency block has slightly better range than Wi-Fi in the 5 GHz frequency block.
Embedded systems:
Uses both hardware & software components
Wi-Fi availability in the home is on the increase.
Increasingly used for remote monitoring including security systems
Also used in hospitals
Long Distance 802.11 Wi-Fi – dish:
Operational advantages of Wi-Fi:
unmatched mobility & elasticity
can be expanded with growth
quick easy setup
lower total ownership cost
more faster & secure
Limitations of Wi-Fi:
Security concern
High power consumption
Interference from other devices
Scarcity of hot spots
Summary:
• Understand it• Plan it• Implement it• Use it• Refine it• Support it