Idle power is the actual power consumption of the device with no ports connected.
Heat dissipation does not include heat dissipated by the PoE-powered devices themselves. When more than four power cords are installed in a 5412R zl2 switch chassis, additional installation requirements are needed. Refer to the HPE 5400R zl2 Switches Quick Setup Guide and Safety/Regulatory Information manual for details. If you want more information you see this : https://www.arubanetworks.com/assets/ds/DS_5400Rzl2SwitchSeries.pdf
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