Cisco Nexus 7000 Hardware Installation And Reference Manual page 175

Chapter 6 Installing Power Supplies
Figure 6-10 Connecting a PIU to a Power Supply and a 3- or 6-kW Power Supply for Input Source Redundancy
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3-kW DC power supply (1 to 4)
Power interface unit (PIU)
Two DC power grids
Connecting a DC Power Supply to DC Power Sources
4 6-kW DC power supply (1 to 4)
5 Connections for 3 kW of available power
6 Connections for 3 kW of reserve power (input
source redundancy)
Cisco Nexus 7000 Series Hardware Installation and Reference Guide
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