Components and Topologies
Wireless LAN Topologies

WLAN technology can either take the place of a traditional wired network or extend its reach and capabilities. Much like the wired counterparts, in-building WLAN equipment consists of client adapters and APs, which perform functions similar to wired networking hubs.

For small or temporary installations, a WLAN can be arranged in a peer-to-peer (also referred to as ad hoc) topology using only client adapters. For added functionality and range, APs can be incorporated to act as the center of a star topology, as shown in Figure . The AP can also function as a bridge to an Ethernet network.

Adopting wireless technology enables computing that is both mobile and connected within a building. Users can move freely within a facility, while maintaining access to the network.

Applying WLAN technology to desktop systems provides an organization with flexibility that is impossible to attain with a traditional LAN. Desktop client systems can be located in places where running cable is impractical or impossible. Desktop PCs can be redeployed anywhere within a facility as frequently as needed. This makes wireless ideal for temporary workgroups and fast-growing organizations.

Building-to-Building WLANs
In much the same way that a commercial radio signal can be picked up in all types of weather, miles away from its transmitter, WLAN technology applies the power of radio waves to truly redefine the local in LAN. With a wireless bridge, networks located in buildings miles from each other can be integrated into a single LAN . When bridging between buildings using traditional copper or fiber-optic cable, freeways, lakes, and even local governments can be impassible obstacles. A wireless bridge makes these less threatening. Transmitting data through the air on no-license frequencies avoids the issues of both licensing and rights-of-way.

Without a wireless alternative, organizations frequently resort to wide area networking (WAN) technologies to link together separate facilities. Contracting for leased-line or other wide-area services often presents a variety of drawbacks:

  • Installation is typically expensive and rarely immediate
  • Monthly fees are often quite high for bandwidth

A wireless bridge can typically be purchased and installed in a day. Once the investment is made there are no recurring charges. Modern wireless bridges provide the bandwidth one would expect from a technology rooted in data communication rather than voice communications.