Wednesday, 6 July 2016

Wireless Technology Concept in IT & Computer (Study Notes for IBPS/SBI/Banking Exams)

Dear mm Expert Readers. Today we are here with series of free study notes. This time our topic is 'Wireless Technology Concept in IT & Computer (Study Notes for IBPS/SBI/Banking Exams)'. You know that in SBI PO mains and all banking examinations computer knowledge is most scoring section but if you don't read seriously then you loss your score. Please note that competitive exam is much competitive and more candidates appearing in CWE Bank exams every year. You prepare with advanced study material, notes and quiz to get high score in your exams.



Wireless communication is the transfer of information or power between two or more points that are not connected by an electrical conductor. The world's first wireless telephone conversation occurred in 1880. The term wireless has been used twice in communications history, with slightly different meaning. 

It was initially used from about 1890 for the first radio transmitting and receiving technology, as in wireless telegraphy, until the new word radio replaced it around 1920. The term was revived in the 1980s and 1990s mainly to distinguish digital devices that communicate without wires, such as the examples listed in the previous paragraph, from those that require wires. This is its primary usage today.

Wireless Technology used in Computers

You know that very huge importance of Wireless Technology, Because modern IT trend require more ex. LTE, LTE-Advanced, Wi-Fi, Bluetooth are some of the most common modern wireless technologies. Computers are very often connected to networks using wireless links

Wireless network

A wireless network is any type of computer network that uses wireless data connections for connecting network nodes.
Examples of wireless networks include cell phone networks, Wireless local networks, wireless sensor networks, satellite communication networks, and terrestrial microwave networks.


Types of wireless networks

These all are most commonly used wireless network in IT & Computer
(1) PAN
(2) LAN
(3) MAN
(4) WAN
(5) GAN
(6) Space network
(7) Mesh network

PAN

Wireless personal area networks (WPANs) interconnect devices within a relatively small area, that is generally within a person's reach. For example, both Bluetooth radio and invisible infrared light provides a WPAN for interconnecting a headset to a laptop. ZigBee also supports WPAN applications. Wi-Fi PANs are becoming commonplace (2010) as equipment designers start to integrate Wi-Fi into a variety of consumer electronic devices. Intel "My WiFi" and Windows 7 "virtual Wi-Fi" capabilities have made Wi-Fi PANs simpler and easier to set up and configure.

LAN

A wireless local area network (WLAN) links two or more devices over a short distance using a wireless distribution method, usually providing a connection through an access point for internet access. The use of spread-spectrum or OFDM technologies may allow users to move around within a local coverage area, and still remain connected to the network.

Products using the IEEE 802.11 WLAN standards are marketed under the Wi-Fi brand name. Fixed wireless technology implements point-to-point links between computers or networks at two distant locations, often using dedicated microwave or modulated laser light beams over line of sight paths. It is often used in cities to connect networks in two or more buildings without installing a wired link.

MAN

Wireless metropolitan area networks (MAN) are a type of wireless network that connects several wireless LANs. WiMAX is a type of Wireless MAN and is described by the IEEE 802.16 standard.

WAN

Wireless wide area networks (WAN) are wireless networks that typically cover large areas, such as between neighbouring towns and cities, or city and suburb. These networks can be used to connect branch offices of business or as a public Internet access system. The wireless connections between access points are usually point to point microwave links using parabolic dishes on the 2.4 GHz band, rather than omnidirectional antennas used with smaller networks. A typical system contains base station gateways, access points and wireless bridging relays. Other configurations are mesh systems where each access point acts as a relay also. When combined with renewable energy systems such as photovoltaic solar panels or wind systems they can be stand alone systems.

GAN

A global area network (GAN) is a network used for supporting mobile across an arbitrary number of wireless LANs, satellite coverage areas, etc. The key challenge in mobile communications is handing off user communications from one local coverage area to the next. In IEEE Project 802, this involves a succession of terrestrial wireless LANs.

Space network

Space networks are networks used for communication between spacecraft, usually in the vicinity of the Earth. The example of this is NASA's Space Network.

Mesh network

A wireless mesh network is a wireless network made up of radio nodes organized in a mesh topology. Each node forwards messages on behalf of the other nodes. Mesh networks can "self-heal", automatically re-routing around a node that has lost power.

5 Important Facts about Wireless networking

To span a distance beyond the capabilities of typical cabling,
To provide a backup communications link in case of normal network failure,
To link portable or temporary workstations,
To overcome situations where normal cabling is difficult or financially impractical, or
To remotely connect mobile users or networks.

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