Simplified WLAN Deployment Processes with Assisted Site Surveys
Site surveys are a critical part of any WLAN design.These surveys help the design team identify placement locations for APs, determine how many APs are needed, identify possible areas of RF interference, and determine the expected range of the WLAN along with a slew of other important information.With the amount of time and effort required to complete these surveys, they can be very costly and are typically outsourced to an outside contractor that has a great deal of experience and access to RF scanning equipment.This process is time consuming, mostly due to the fact that a great deal of guesswork is involved in the initial planning followed by modifications to improve performance post-implementation. The Cisco wireless-aware LAN framework has some features that help make this part of the design phase much easier.The wireless-aware framework allows the network administrator to use tools included with the WLSE to perform their own site surveys using in-house staff, thus cutting down on cost and time. Using these tools, administrators can follow a simple 5-step process to perform a complete site survey in the WLAN environment.These five steps are: 1. A floor plan of the location to be surveyed is imported into the tool. The tool supports a variety of electronic file formats including .bmp, .jpg, and .gif. If an electronic file is unavailable, a rough building diagram can be drawn within the tool. 2. Initial AP locations are added to the diagram to provide a rough estimate of the number of APs required for the facility. 3. Cisco Aironet Series APs are installed in the facility at locations corresponding to their diagram placements. 4. The installed Cisco Aironet Series APs are set to a site survey mode known as “AP Scan Mode,” where they all assume the same channel and transmit at maximum power. In this mode, the APs detect the presence of one another and automatically select transmit power, frequency selection, and other settings to fully cover the facility area. 5. Finally, the AP RF settings are fine-tuned in the “Client Walkabout” mode. In this mode, an individual walks the facility areas where coverage is needed, including the perimeter, with a client device that is sending continual RF measurements back to the Cisco Aironet Series APs. These steps are all that are required to perform a site survey using the Cisco wireless-aware LAN framework. All future WLAN management and monitoring can be done through the WLSE based on current information from the constant WLAN RF monitoring data stream. Additional APs can be added or existing APs can be moved based on this information.
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