To plan for the power requirements of a switch, you must determine each of the following:
Power requirements for all of the switch components
Minimum number of power supplies required to power the components installed in the switch
Power mode to use and the number of additional power supplies required for that mode
You must also ensure that the circuit used for the switch is dedicated to the switch to minimize the possibility of circuit
failure. Also, ensure that the switch uses either AC or DC power sources, not a mix of AC and DC power sources.
When you know the amount of power that is required for operations (available power) and redundancy (reserve power), you can
plan for the required number of input power receptacles within reach of the switch location.