20 Deployment metrics for different tracking typesNN47250-504 (324122-A Version 01.01)Access ControlAccess Control, also referred to as Perimeter Control deployments. They are similar to Content Delivery deployments,but require more comprehensive location information, covering all possible avenues of access into a facility. Therefore,this level of tracking requires a greater number of Location APs, Locales, and RF Fingerprints.LocalesFor this type of tracking, you need to initially determine which areas are to be secured and to what level. Then, createLocales accordingly. For example, you may decide you need room-level tracking in the Executive offices, but justdepartment-level tracking elsewhere. This would require a Locale in each office in the Executive Suites and a Localeevery 3,000 square feet in the rest of the building.Location AP Placement/DensityThe general guideline for building-level perimeter tracking is one Location AP for every 3,000 to 4,000 square feet ofspace. In addition, for each building, make sure that there are two APs within 50 feet of the building entrance or exit. Fordeployments that require maximum security, deploy Location APs outside as well (for example, on awnings). As youtest the deployment with walkthroughs, you may find that you need to add Location APs to provide more data in aparticular area.When using this density of Location APs in a deployment, typical precision and latency numbers can be expected in therange of 5 meters within 3 minutes.RF FingerprintsThis type of location tracking requires one RF Fingerprint per Locale. More RF Fingerprints may be used in certain tran-sition points to enable the Nortel WLE2340 to correctly report the location of a device when it passes through thetransition from one Locale to the next.Note. For buildings that wrap around and enclose space (outside), such as buildings inthe shape of the letter ‘C’, increase the number of Location APs.