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stations. The properties of the physical layer are hidden to maintain and secure the <br />configuration and the commissioning of the network database. <br />The ZigBee signal has the following characteristics: <br />• A 2.4 GHz wireless physical layer with a data rate of 250 kb/s <br />• An inexpensive installation <br />• Easy implementation <br />• Reliable data transfer <br />• 48.7 m (160 ft) operation range <br />• Very low energy consumption (Typically: 3.5 W, Maximum: 15 W, varies depending on <br />the gateway model) <br />3.2.1.1. Zigbee Signal <br />To optimize the Zigbee signal, it is important to consider obstructions and structures in the <br />layout design. The objects in the communication gateway's line of sight may reduce the <br />range of the Zigbee signal, thus affecting the communication between the gateway and <br />the charging stations. Materials such as wood and concrete will limit the range to a few <br />meters, whereas metal will completely block the signal. <br />NO SIGNAL <br />WEAK SIGNAL <br />Charging station Communication Charging station Communication <br />Gateway Gateway <br />Metallic Wall Concrete Wall <br />As such, to ensure a proper installation and communication, the communication gateway <br />must be installed in the following way: <br />• On a single level floor rather than a multi -level floor plan. <br />• Using at least one communication gateway per floor. <br />7 <br />