Wireless networking requires at least two radios. Each computer or device containing a radio that transmits and/or receives data over the wireless network is called a station. And station can be client or a server.
Some manufacturers produce extension points, which act as wireless relays, extending the range of a single access point. Multiple extension points can be strung together to provide wireless access to far away locations from the central access point.
An ad-hoc, or peer-to-peer wireless network consists of a number of computers each equipped with a wireless networking interface card. Each computer can communicate directly with all of the other wireless enabled computers.
Wireless pc Wireless pc Wireless pc A C B BSS 1 BSS 2
A wireless computer can "roam" from one access point to another, with the software and hardware maintaining a steady network connection by monitoring the signal strength from in range access points and locking on to the one with the best quality.
A user can move from Area 1 to Area 2 transparently. The Wireless networking hardware automatically swaps to the Access Point with the best signal. USER
The IEEE 802.11 wireless networking standard define five ways that data can be transmitted between two wireless devices. These transmission method are called physical layers . Each physical layer is independent of other physical layers. Each pair of 802.11 complain radios uses of these physical layers to communicate.
In 1985 the Federal Communication commission (FCC) made change radios the radio spectrum regulation and assigned three bands designated as the industrial, scientific, and medical (ISM). These frequency bands are :
( M ultiple I nput M ultiple O utput) Pronounced “ my-mo," it is the use of multiple transmitters and receivers (multiple antennas) on wireless devices for improved performance. When two transmitters and two or more receivers are used, two simultaneous data streams can be sent, which double the data rate. Multiple receivers alone allow greater distances between devices. The upcoming IEEE 802.11n wireless standard uses MIMO to, at a minimum, double the 54 Mbps speed of 802.11a and 802.11g to 108 Mbps.