The Catalyst switches support redundant AC-input or DC-input power supplies. You may use dual power supplies, as long as both have the same type, that is, either AC- or DC-input power. Each power supply has an individual power switch and a status LED on the supervisor engine.Both AC-input and DC-input power supplies support redundant hot swapping. When power is removed from one power supply, the redundant power feature causes the second power supply to produce full power.