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Tuesday, 29 May 2012

Wireless Technology

What is Wireless Computer Networking?

Wireless networks utilize radio waves and/or microwaves to maintain communication channels between computers. Wireless networking is a more modern alternative to wired networking that relies on copper and/or fiber optic cabling between network devices.
A wireless network offers advantages and disadvantages compared to a wired network. Advantages of wireless include mobility and elimination of unsightly cables. Disadvantages of wireless include the potential for radio interference due to weather, other wireless devices, or obstructions like walls.
Wireless is rapidly gaining in popularity for both home and business networking. Wireless technology continues to improve, and the cost of wireless products continues to decrease. Popular wireless local area networking (WLAN) products conform to the 802.11 "Wi-Fi" standards. The gear a person needs to build wireless networks includes network adapters (NICs), access points (APs), and routers.

Devices commonly used wireless technology :

1) Portable computers.
2) Desktop computers.
3) PDAs.
4) Cellulars phones.
5) GPS.

Types of wireless :

A wireless network joins two or more than two computers by means of communication without using any wires. Wireless Networks utilizes spread-spectrum or OFDM depends on the technology which is using .Wireless network enable a user to move about within a wide coverage area and still be associated to the network. There are different types of wireless networking such as wide area network, local area network and personal area network but the most common are of two.

WLAN (Wireless Local Area Network)
WLANs provide wireless network contact using radio signal instead of traditional network cabling and built by joining a device called AP through which a user converse with the AP using a wireless network. WLAN also network security because it relics an important issue for WLANs. The WEP technology used in WLAN elevate the rank of security. WLANs have expanded well-built status in a different kind of markets during the last seven years and set up to offer wireless connectivity within a limited exposure area which may be a hospital, a university, the airport, health care providers or a gas plant. WLAN is providing highest data-transfer rate with 802.11 terminologies. Today WLANs are fetching more usually recognized as a general-purpose connectivity substitute for a wide array of business customers. WLANs offering various benefit for user such as mobility, condensed Cost-of-Ownership, installation speed and flexibility and scalability. The technology used in WLANs is Spread Spectrum developed by the military offer secure and reliable services. Frequency-hopping spread-spectrum maintains a single logical channel and Direct-Sequence Spread Spectrum offer chip pattern to make it more effective and infrared technology. Wireless LAN adapters are necessary for regular computer platforms. The benefits of WLAN  are high Range and coverage, Throughput, Mulitpath Effects, Integrity, Interoperability with Wired Infrastructure, Interoperability with Wireless Infrastructure, Interference and Coexistence, Simplicity and Ease of Use, Security, Cost, Scalability and , Safety which makes a wireless network in real a great platform.

WMAN (Wireless Metropolitan Area Network)
Fast communications of network within the vicinity of a metropolitan area is called WMAN, that put up an entire city or other related geographic area and can span up to 50km. WMAN designed for a larger geographical area than a LAN. The standard of MAN is DQDB which cover up to 30 miles with the speed of 34 Mbit/s to 155 Mbit/s.1t is more common in schools, colleges, and public services support a high-speed network backbone. WMAN is a certified name by the IEEE 802.16 that functioning on Broadband for its wireless metropolitan. WMAN have air interface and a single-carrier scheme intended to activate in the 10-66 GHz spectrum, supports incessantly unreliable transfer levels at many certified frequencies. WMAN opens the door for the creation and Provide high-speed Internet access to business subscribers.It can handle thousands of user stations with prevents collisions and support legacy voice systems, voice over IP, TCP/IP. WMAN offer different applications with different QoS requirements.The technology of WMAN consist of ATM, FDDI, and SMDS. WiMAX is a term used for Wireless metropolitan area network and plinth on the IEEE 802.16.