Objective : The objective of this topic is to compare the results of energy consumption measurements of different POE devices, in our case a Cisco POE switch, a sensor and a light, using power meter and Raritan. For each type of measurement we use 3 different topologies. First one by is connecting POE device directly to meter/Raritan. Second is connecting Cisco Power Injector to the meter/Raritan and the POE devices to PI. The last is connecting 2960 switch to meter/Raritan and POEs with the switch.