Nortel 2340 Configuration Manual page 36

36 Nortel WLAN Location Engine 2340 Web GUI
The Location APs you have installed (within a 300' radius of the calibration device) can be shown in the graph. If any are
missing, select Cancel and navigate to the Configuration -> Location APs page to evaluate the problem before
restarting calibration.
7
Capturing RF data for a RF fingerprint is a brief two part process in which you first stand in the center of
the RF fingerprint, and then walk a circle:
• For the first half of the calibration period (as measured by the flashing Progress label), stand
in the center of the RF fingerprint and slowly 'turn' in place, rotating a full 360 degree. The
reason you turn in place is to account for variations in the data caused by an RF shadow (i.e. a
surface, such as a girder, column, elevator shaft, stairwell, or even a human body). RF shadows
occlude the RF signal measured by a particular Location AP, distorting the representation of
the space the Nortel WLAN Location Engine Tracking Engine creates during calibration. By
turning in place, you ensure that the Nortel WLAN Location Engine Tracking Engine creates a
very strong representation of the center of the RF fingerprint.
• For the remaining 50% of the calibration (as indicated by the flashing Progress label), walk in
a circle, to vary the signal strengths received by nearby Location APs. The size of the circle for
smaller spaces, like offices, can be roughly one-third of the floor space. For example, in a
300 sq ft conference room, the circle you traverse can cover approximately 100 sq ft. For
spaces larger than 500 sq ft, the diameter of the circle can stay fixed at 15 ft, regardless of how
large the RF fingerprint is. Your rough sense of these proportions is good enough and you
don't need to measure the circle you traverse. After the calibration interval is completed (as
signaled by flashing Progress label), the RF Fingerprint Quality is displayed as follows:
❍
❍
❍
❍
If the quality is not Excellent, it means that the quality of the data collected by the WLE2340 was not
sufficient to create an accurate fingerprint of the space, and you can recapture data for the RF Fingerprint.
8
Click Save.
NN47250-504 (324122-A Version 01.01)
Excellent
Good
Fair
Poor.