Optimizing a Network Plan 445Nortel WLAN—Management Software 2300 Series Reference GuideIf the measurements came from a site survey file, they are measurements between theportable AP (LOS point) and the PC running the site survey tool. If the measurementscame from AP radios in the network, they are measurements between AP radios.• The Total number of objects that will be corrected line indicates the number ofmeasurements that did experience attenuation. For existing RF objects, WLANManagement Software corrects the attenuation to match the results.For RF obstacles created by WLAN Management Software, the description isauto-generated and the obstacle type is Other. You can edit these values by selecting theobstacle, clicking the Edit properties icon to open the Modify RF Obstacle wizard, andmodifying the values. Click OK to close the wizard and save the changes. (See “To use theCreate RF Obstacle Dialog box” (page 102). The wizard is the same whether it is labeledCreate or Modify.)2 Click Finish.If the imported RSSI values do not match the values predicated by WLAN Management Software, WLANManagement Software looks for an RF obstacle in the plan that might be causing attenuation, and adjusts itsattenuation value in the plan so that the predicted RSSI matches the measured RSSI. However, the followingshould be noted:• The Optimize feature adjusts attenuation values only if the network plan has an RF obstacle in the line ofsight between measurement points (for example, between APs that made the measurements). WLANManagement Software does not create an obstacle to account for the RSSI if one does not already exist.• Only one obstacle between any two measurement points is adjusted, even if there are multiple obstaclesbetween the measurement points.The measurements reflect how well the measuring APs can hear one another, and do not directly measure howwell clients can hear the APs. For example, if the APs are mounted on the ceiling, attenuation of their signalsto one another might be less than the attenuation of the same signals when received by clients on desktops incubicles and offices.Locating and Fixing Coverage HolesAfter you import RF measurements and optimize, you can look for coverage holes by displaying coverage.Locating a Coverage Hole1 Select the RF Planning option in the main WLAN Management Software tool bar.2 Display the floor plan in the Content panel.3 In the Show RF coverage using listbox, select how you want to display the coverage:• Baseline Association Rate—Coverage is shown based on the AP radio baselineassociation rate. The baseline association rate is the typical data rate the radio isexpected to support for client associations. (The baseline association rate is specifiedduring planning, on a coverage area basis.)• Data Rate—Coverage is shown in colored bands that represent each of the datatransmit rates supported by the radio. These rates are standard for each radio type.
