The system is referred to as a dual AC system because the power subsystem in each cabinet can accommodate power from two separate power sources.
Each
PFC
cabinet has two AC boxes (one blue AC box and one orange AC box), providing dedicated inlets for the two power sources.
- Power cords from blue AC boxes must be connected to one power source, and power cords from orange AC boxes must be connected to a separate power source.
- By default, current is shared between the two AC boxes.
- If one power source is lost, the current on the AC box connected to the remaining power source will increase to take over power for the lost source; however, the system will experience some operational degradation.
Note that power connections to some Ethernet switches are not redundant. A system that loses operation on some of its power cords will lose operation on Ethernet switches that are connected to a single power supply. For information about which AC boxes provide power to which Ethernet switches, see the Cabling appendix and the Chassis Port Reference appendix in the Hardware Installation Guide for your system.