14 Device tracking concepts and featuresNN47250-504 (324122-A Version 01.01)Tracking PrecisionThe Nortel WLE2340 Tracking Engine can be configured to provide a spectrum of tracking precision. The greater theprecision, more the RF Fingerprints are required. For example:• Physical Perimeter: Device location is reported as inside or outside your company's physical perimeter.• Department: Device location is reported as inside a specific department within the physical perimeter or outside thephysical perimeter.• Room: Device location is reported as inside a specific room within the physical perimeter or outside the physicalperimeter.LocalesDuring calibration, a name is assigned to each discrete area that the Nortel WLE2340 monitors. In an office building,Locales can be named as Conference Room, Lobby, and Engineering Lab. In a corporate campus or multi-buildingmanufacturing facility, Locales can be named as Warehouse 1, Warehouse2, and Warehouse3. Locales can be of anysize, for example, a 500 square foot room or a 20,000 square foot warehouse.The number of Locales you create, can be named as many as required discrete Locales to match the precision level oftracking that you are implementing. Locale names correspond to buildings, floors, departments, or rooms. For example,for room level tracking precision, you create one locale for every room.Location APsThe Nortel WLE Tracking Engine relies on Location APs to monitor the airwaves for 802.11 traffic and report data thatthe Nortel WLE(2340) Tracking Engine uses to match the RF fingerprint of a device's current location to the RF finger-prints it has on file.RF FingerprintsThe Nortel WLE2340 creates RF Fingerprints by analyzing the RF characteristics of the space under surveillance. ThisRF data is automatically captured during the calibration phase of the deployment. Each RF Fingerprint created must be‘bound’ (associated) with a Locale.The number of RF Fingerprints that can be captured is directly proportional to the following:• size of the locales• size of the building• precision of tracking requiredFor more information on metrics for each level of tracking, see 'Deployment Types for Different Tracking Types'chapter.