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Transcript of Wireless Networks(New)
Woon Kai Lin, Yu Nanda Zaw
Support bandwidth up to
Uses the same unregulated radio signal frequency (
User may experience interference from other electrical products such as microwave ovens,cordless telephones and Bluetooth devices that uses the same frequency(2.4GHz).
By installing a gear to a reasonable distance, this problem can be prevented.
: Low cost, good signal and not easily obstructed, popular among families.
: Slow speed.
IEEE 802.11 is a set of media access control (MAC) and physical layer (PHY) specifications for implementing wireless local area network (WLAN).
Transmit data by using:
-FHSS(Frequency Hopping Spread Sprectrum),
-DSSS(Direct Sequence Spread Sprectrum).
a wireless network
links computers, cell phones and other network devices over a short distance(up to 10 meters)
Bluetooth exchange data at the rate of 1Mbps.
compare to WiFi, slower in speed and limited ranges of distance.
NFC: Near Field Communication
By touching 2 smartphones from a near distance, data can be exchanged.(usually not more than a few inches)
Smartphones such as Samsung galaxy S3,S4 with features named as S Beam will be able to use NFC to exchange documents, pictures, etc.
However,this only works when both smartphones have Android version JellyBean and above. The user must be using a samsung S Series phone in order to use this funtion.
Data transter rate up to
due to high cost, 802.11b becomes more popular than 802.11a.
used in big companies.
: Fast speed, not easily interfered by other devices.
: Expensive, signal have difficulties passing through walls
Devices using Bluetooth
Wireless Transmission Medium
Sending and receiving data is through the air,vacuum,free space,water.
Types of transmission medium-
What is a Wireless Network?
NFC uses Wifi-direct to shares files and documents as it is faster than bluetooth and it is able to send large files to one another.
Examples of NFC
Sharing contacts,photos,video, files and for multiplayer games.
Useful to exchange contacts and files.
A ticket stamping machine of the Austrian Federal Railways that can be used to purchase mobile tickets ("Handy-Ticket").
Some steps showing how NFC transferring data works
Done by: Yu Nanda Zaw
Woon Kai Lin
Thanks for watching!
Easy to connect between devices
Low power consumption (100mW for the range around 100m)
Risky, not secure
Interference with other devices using the same frequency
A wireless network is a network that uses electromagnetic radio waves to transfer data between devices without using cables.
Examples - Wifi, Cellphone networks, Microwave networks
Benefits of WLAN
Easy set up - flexible installation
Security (Using WPA and WPA2)
Cost effective -compare to some conditions where physical connections are not possible
Future developments of WLAN standards
For example: upcoming 802.11ad called Tri-band Wifi is to be launched.
up to 7Gbps.
Fastest speed up to now.
1.Enable NFC on both mobiles.
Open the file or photo that is to be sent
Press Menu key and select Send>Tag
3.Align the backs of the two NFC enabled smartphones to send and receive the file