WIRELESS TECHNOLOGY

Wireless technology

This week I learn wireless technology which is different with last week. This technology does not use wire as the medium of connection. This technology use  signal (radio) signals to send data through the airwaves between devices. Wireless technology is generally used for mobile IT equipment. It encompasses cellular telephones, personal digital assistants (PDA's), and wireless networking. For the example, GPS units, garage door openers and or garage doors, wireless computer mice and keyboards, satellite television and cordless telephones are the technology that’s use wireless technology.

Cisco’s Wireless data initiatives:

·         Point-point/ Multipoint wireless

·         Wireless LAN

·         Wireless local loop

·         Mobile cellular voice/data communications

There are many uses of the wireless technology that  helps our daily life to be more easier. Mobile users can use their cellular phone to access e-mail anywhere and anytime. Travelers with portable computers can connect to the Internet through base stations  installed in airports, railway stations, and other public locations. At home, users can connect devices on their desktop to synchronize data and transfer files.

Type of wireless technology

ü  Wireless wide area networks (WWANs)

ü  Wireless metropolitan area networks (WMANs)

ü  Wireless local area networks (WLANs)

ü  Wireless personal area networks (WPANs

This is the example of the type wireless technology:

           

1.Infra Red

•  Do not use signals in radio frequency

•Send data as infrared light rays in short distance

•IrDA (Infrared Data Association) is an industry standard for wireless communication with infrared light.

•Many laptops sold today are equipped with an IrDA-compatible transceiver that enables communication with other devices, such as printers, modems, LANs, or other laptops. The transfer speed ranges from 2400 bps to 4 Mbps

2.Wireless local area networks (WLANs) , WiFi

•WLANs are based on the IEEE 802.11 standard.

•IEEE 802.11 standard is a standard that has been developed by IEEE (Institute of Electrical and Eletronic Engineers) to differentiate between the various technology families

•There are three physical layers for WLANs: two radio frequency specifications (RF - direct sequence and frequency hopping spread spectrum) and one infrared (IR).

•Wi-Fi underlying this technology

•WLAN configurations vary from simple, independent, peer-to-peer connections between a set of PCs, to more complex, intra-building infrastructure networks.

•Wireless solutions :

i. A point-to-point solution is used to bridge between two local area networks, and to provide an alternative to cable between two geographically distant locations (up to 30 miles).

ii. Point-to-multi-point solutions connect several, separate locations to one single location or building

 3.Broadband wireless.

•Broadband wireless access is a technology aimed at providing high-speed wireless access over a wide area from devices such as personal computers to data networks.

•According to the 802.16-2004 standard, broadband means 'having instantaneous bandwidth greater than around 1 MHz and supporting data rates greater than about 1.5 Mbit/s

•It is planned to be used in the next few years

and is estimated to have a range of

50km (30 miles).

4.Bluetooth,

•Bluetooth is an industrial specification for wireless personal area networks (PANs).

•Designed for very short range <10 m

•Connect and exchange information between devices such as mobile phones, laptops, PCs, printers, digital cameras and video game consoles over a secure, globally unlicensed short-range radio frequency.

•Data speed up to 3Mbps

5.WiMax

• To extend the range of wireless network

•Speed up to 70Mbps, Range 30 miles

•Provides access to internet access to fixed location with larger coverage

I also learn about the generation of mobile phone. I hope this picture make you understand the evolution of mobile phone from 1G to 4G.