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This DC power supply can be installed in either of the two slots at the top of the Smart 16e Shelf. If only one power supply is used, the blank power supply face-plate furnished with the rack should be installed over the unused slot. The Smart 16e Shelf is fully operational with one power supply; however, a second supply can be added to provide backup for the power supply subsystem. With the two-supply configuration, one of the supplies will operate in a hot-standby mode (the corresponding output on the standby supply will automatically provide the power required if any one of the four outputs from a supply fails or begins to operate out of specifications).