Chapter 10. Using Site Survey ToolsThis chapter covers the following topics:Types of Site SurveysManual Site Survey ToolsAutomatic and Assisted Site Survey ToolsTheoretical Survey Tools Chapter 11, "Performing a WLAN Site Survey," covers the topics of survey procedures and what thresholds are needed to define the cell coverage.The tools selected for performing a survey depend on the level of completeness of the site infrastructure. Some tools require an existing wired LAN and the installation of at least some of the wireless infrastructure. Other tools can be used with little or no infrastructure in place. With any of the tools, the data rate will need to be configured for the minimum data rates required by design (based on applications to be used). Placement of access points (APs) will vary based on the type of survey, as will the transmitter power settings.Another factor that needs to be incorporated into the site survey plan is the client capability. Not all clients have the same antenna gain, antenna performance, transmit power, or receiver sensitivity. Before beginning any survey, you must determine the "worst-case" client that will be used at the site. Here, the term worst case describes the performance of the client, included in the site's design, that will exhibit the poorest range. You might need to test to determine which client that will be. For example, many clients offer 100 mW of transmitter power; but as mentioned in Chapter 5, "Selecting the WLAN Architecture and Hardware," many of the 802.11b and 802.11g clients on the market today only provide 30 mW. A search of the vendor's website might produce a data sheet with specifics about the radio performance. Virtually all devices with a radio will have an FCC ID (if sold in the United States). The FCC website stores PDF files of the radio transmitter specifications, which are public information. To access the information, use the first three characters of the FCC ID to search for the radio vendor's files. The site is |
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