TABLE OF CONTENTS The task of building a WLAN for voice or data applications involves specifying requirements, developing an initial design, purchasing and installing components, tuning the installation, and providing the ongoing systems for management and maintenance. In this chapter we are going to look at the major elements needed to build that WLAN infrastructure.
A wireless LAN for home or small business use is a relatively simple configuration. The access point is built into the DSL/cable modem router, wireless network interface cards (NICs) are needed for any devices that will connect wirelessly, and there are some relatively simple setup procedures. Those procedures are simple for people with a networking background, but most non-technical users can t seem to figure out how to turn on the security or encryption features!
Commercial installations present a far greater challenge. Rather than one access point, we might need hundreds to cover a large building or campus. Security and privacy are mandatory requirements, and those systems must interoperate with the organization s overall security architecture. Further, we will need tools and systems that allow us to maintain and troubleshoot this complex infrastructure.
The requirement to support voice is a critical differentiator in WLANs. Where it might be adequate to provide data services in selected areas (e.g., conference rooms and public spaces) voice support requires pervasive coverage throughout the facility. If there is not sufficient capacity in a data network, users will get poor performance, but they will still be able to connect. Poor coverage in a voice network...
