Dell PowerConnect W-Airwave User Manual page 17

To tune location accuracy, navigate to the Location Settings section on this page as described in
Table 6 Location Settings Section in VisualRF > Setup
Setting
Allowed deviation for
client placement
Maximum Rogue APs
per Floor Plan
To tune the frequency for calculating device locations within the VisualRF UI navigate to the Location
Calculation Timer Settings section as described in
Table 7 Location Calculation Timer Settings Section of VisualRF > Setup
Setting
Legacy Laptop Min/Max
(sec)
Legacy Laptop Number
of Samples
All of the other device types (phone, printer, scale, and so on) use the same methodology as detailed above.
Dell PowerConnect W AirWave 7.2 | VisualRF User Guide
Default Description
4 dB When VisualRF locates a client or rogue it utilizes signal metrics from all the APs that
hear the client or rogue device. VisualRF builds a fingerprint location for all clients with
similar transmit-power capability. All subsequent clients that fall within the deviation is
placed on the same location fingerprint or x, y coordinates.
Example: AP #1 hears client1 at -72, and AP #2 hears client 1 at -64. VisualRF calculates
the client's location to be at coordinates 100, 200. Client2 is heard by AP#1 at -71 and
AP#2 at -65.
VisualRF will use the average of the difference in signals (AP#1 -72 and -71) to see if the
client matches a pre-calculated location fingerprint. 1 + 1 (differences in signals) / 2 (# of
APs) = 1 which falls within the deviation of 2, hence the client would be located at
100,200.
20 Sets the maximum number of rogues AMP will place on a Floor. Use this filter in
combination with the RAPIDS Export Threshold configured on the RAPIDS > Setup page
to intelligently control the number of rogue devices displayed per floor.
NOTE: Increasing this value could increase the load on the server and the clutter on the
screen.
Default Description
90/360 This timer determines how often to calculate location for legacy laptop devices. Taken
with the data samples the calculation would follow:
After minimum timer (90 seconds) check to see if the number of data samples received
from all APs that hear this client are greater than or equal to the number of samples
setting for legacy laptop devices (default of 3 data samples).
If so (Yes to question above) then recalculate the client device's location based on the
samples received.
If not (No to the question above) then wait until the number of sample setting is met and
recalculate. If the number of samples is never met, wait until the maximum timer (360
seconds) and recalculate.
3 See definition above.
Table 8:
Table 6:
Setting Up and Tuning VisualRF | 15