A rapid mounting hallow wall anchor comprises a cleat with latching tooth and hanging flange, and a T-shaped anchor structure with latching cogs on its stem. Selected nodes are determined as access points to the data network, such that each node may be a source node from which the selected data packets can be transmitted, or a destination node to which the selected data packets can be intended. In a specific embodiment, the lower cell includes a lower glass substrate material, e. A wide measurement ranging system includes range indicators including a highest range indicator, a plurality of intermediate range indicators, and a lowest range indicator. The other terminal of each switch is connected to one terminal of the DC power supply while the other terminal of each bidirectional switch is connected to the other terminal of the DC power supply.