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
cabinet has either two AC feeder boxes (one on each side of the cabinet), or four AC feeder boxes (two on each side of the cabinet).
- The AC feeder box(es) on one side of the cabinet must be connected to one power source, and the AC feeder box(es) on the other side of the cabinet must be connected to a separate power source.
- By default:
- If a cabinet has two AC feeder boxes, both share current.
- If a cabinet has four AC feeder boxes, the top two AC feeder boxes share current, and the bottom two AC feeder boxes share current.
- If the power source connected to the AC feeder box(es) on one side of the cabinet is lost, the current on the AC feeder box(es) connected to the remaining power source will increase to take over power for the lost source; however, the system will experience some operational degradation.
Each InfiniBand switch
and 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.