Wi-Fi, (Wireless Fidelity) is a trademark that belongs to the Wi-Fi Alliance. It is name commonly used for the standard of wireless (radio) connection that integrates several protocols and is based on a family of IEEE 802.11 standards (Institute of Electrical and Electronic Engineers is an international organization dedicated to the development of standards in electronic technology). The most famous and the most common today is IEEE 802.11g protocol, which determines the operation of wireless networks.
Install Wireless LAN was recommended where the deployment of cable system was impossible or economically impractical. Today, many organizations use Wi-Fi, since under certain conditions, the speed of networks now exceeds 100 Mbit / s. Users can still be connected to a Wi-Fi network, while moving between wireless access points (WAP).
Mobile devices (PDAs, smart phones, PSP, laptops), equipped with Wi-Fi client transceiver devices, can be connected to the local network and access the Internet through a WAP or hotspot.
Small bandwidth, no roaming and authentication capabilities do not allow Wi-Fi devices to press on the mobile market. However, such company as ZyXEL, SocketIP, and iSymbol Technologies offers solutions for Wi-Fi telephony.
The history of Wi-Fi starts from mid-1990s. The technology of information transmission by radio has been developed and applied mainly in local networks of large corporations and firms in Silicon Valley, USA. Contact with a mobile subscriber (usually it was a company employee with a laptop equipped with a wireless network adapter) was organized through WAPs that were connected to a wired infrastructure. Thus, in the reach radius of each such point (a few tens of meters) could be up to 20 subscribers using the network resources simultaneously. Originally, the term «Wi-Fi» only used to refer to technology, which provides communication in the 2.4 GHz and runs on the IEEE 802.11b standard (baud rate – up to 11 Mbit / s). Currently, however, the term is increasingly used for other wireless LAN technologies. The most significant among them are the IEEE 802.11a and 802.11g (speed is up to 54 Mbit / s, frequency ranges, respectively, 5 GHz and 2.4 GHz).
Students, preparing their research proposal on the Wi-Fi, should use free example research topics on wifi security, which allow them to understand that 802.11b standard was developed in the late 90s and finally approved in early 1999. In 2000, there began to appear the first devices to transfer data based on it. Wi-Fi devices were intended for corporate users to replace traditional cable networks. For wired networks need careful design of network topology and manually laying many hundreds of meters of cable, sometimes in unexpected places. To organize the same wireless network, you only need to install one or more office base stations (central transceiver with an antenna connected to the external network or server) and insert a network adapter with antenna into every computer. Then computers can be moved arbitrarily, and even moving to a new office becomes possible keeping once created network.
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