Users Guide

272 | Using VisualRF Dell PowerConnect W-AirWave |Version 7.3
 You should delete and resurvey an area or a floor plan after a remodel or significant interior movement.
 Surveys should be conducted during normal business hours to reflect normal RF activity on the floor.
 11a clients automatically inherit the proper transmit power from the 11g configuration. Example: 30mW Pre-
2006 laptops equate to 20mW for 11a clients.
 AMP dynamically assigns a transmit power to every client based on OUI as shown in Table 150. This step
increases the accuracy for surveys by allowing an override.
Adding Location Probability Regions
Location probability regions are optional regions that can be used to increase the accuracy of device location in
VisualRF.
VisualRF calculates device locations based on probability. VisualRF determines the probability of a device being
located in every grid cell and places the device where the probability is the highest.
Probability regions will add or remove up to 20% chance from the device location probability. They can be used to
push users into regions where they are more likely to be located, like conference rooms and cubical farms, or they
can be used to pull users out of regions where they are less likely to be like parking lots and courtyards.
To add a probability region to a floor plan, follow these steps:
1. Select the Edit menu and click the Draw Region option.
2. Outline the desired probability region. Double click to end the outline process.
3. Name the region, select a Region Type of Location Probability and select OK.
4. Move the location probability slider to the desired level, as shown on Figure 208. Very Low will decrease the
probability of a device being placed in that region by 20%. Very High will increase the probability of a device
being placed in that region by 20%.
Table 150 Auto-assigned Client Type and Transmit Power
Client Type Transmit Power 11g
Pre-2006 Laptops 30 mW
Post -2006 Laptops 100 mW
SOHO WLAN Cards (D-Link, Net Gear, LINKSYS) 30 mW
RFID Tags 10 mW
PDA 20 mW
iPhone 20 mW
Desktop 100 mW
Cisco Cards 100 mW