The disclosure is directed to a system including a set of short-range wireless access points and a policy server. The set of short-range wireless access points are configured to provide a short-range wireless network having a coverage area and are configured to communicate with a wireless enabled device within the coverage area. The policy server is communicatively coupled with the set of short-range wireless access points and is configured to determine whether the wireless enabled device is located within a designated region within the coverage area based on data received from the set of short-range wireless access points.

 
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> Method for calculating availability for line power systems

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