Wireless Local Area Networks (WLANs)

WLAN technology allows users to build a wireless network in an area of local nature (for example, in the office building environment, building on the campus or public area, such as airport or cafe). WLAN can be used in temporary offices or in which the permanent cable installation is not allowed. Or WLAN sometimes built as a supplement to an existing LAN, so users can work on a variety of different locations within the building. WLAN can be operated in two ways. In the WLAN infrastructure, wireless stations (devices with radio network cards or external modems) connected to a wireless access point that serves as a bridge between the stations and the existing backbone network at the time. In a WLAN environment in nature peer-to-peer (ad hoc), some users in limited areas, such as meeting rooms, can form a temporary network without using access points, if they do not require access to resources jaringan.Pada in 1997, to approve the IEEE 802.11 standard for WLANs, which specifies a data transfer rate of 1 to 2 megabits per second (Mbps). Under the 802.11b, which became the dominant new standard at the moment, data is transferred at a maximum speed of 11 Mbps with a frequency of 2.4 gigahertz (GHz). Newer standards others are 802.11a, which specifies data transfers at a maximum speed of 54 Mbps through the 5 GHz frequency


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