away with-wires. This system is known as wireless LAN, as with Wi-Fi we can
connect different computers in a LAN using radio waves.This standard is known as IEEE 802 .11. There are different versions of this standard available. They are 802.11b, 802.11a & 802.11g. A comparison of the
different standards is given below. WiFi generally refers to any type of IEEE
802.11 standard.
1. Access point: - Access point (AP) is a device, which is acting as a bridge
between the wireless client device and the wired network.
2. Wireless client device: - Wireless client device can be a 802.11-enabled
laptop/desktop (PC). The laptops available today are Wi-Fi supported with.
As far as PC’s are concerned, Wi-Fi can be enabled by installing Wi-Fi
adaptor cards (PCMCIA card) in PC’s or by connecting external USB
adaptor cards and installing the driver software.
The Wi-Fi client devices are accessing the Access Point (AP) through the radio
air interface. The AP is connected to IP network mainly through wired interface.
The Wi-Fi client device is thus able to access the IP network through the AP. The
geographic area served by the AP is defined as the hotspot .The Wi-Fi client
device within the range of hotspot (up to 100m) can access the AP through the
radio interface. In the 2.4 GHz system normally used in Wi-Fi, the frequency band
is between 2.4GHz to 2.484GHz. Each channel is of 22MHz bandwidth. Normally
an AP has 11 channels available and out of these channels 1,6,11 are non overlapping.
