Power requirements

To get the best PoE performance, you should provide enough PoE power to exceed the maximum amount of power that is needed by all the PDs that are being used.

By connecting an external power supply you can optionally provision more PoE wattage per port and or supply the switch with redundant 12V power to operate should an internal power supply fail. A Power Supply Shelf (external power supply) can also be connected to these switches to provide extra or redundant PoE power.

See the PoE/PoE+ planning and implementation guide for detailed information about the PoE/PoE+ power requirements for your switch.