The Octel 350 power supply with part number 012-2037-000 is "hot pluggable" and operates at 5v DC.
The 012-2037-000 +5-Vdc power supplies are located at the front of each server cabinet, to the left of the logic bay. A pair of 012-2037-000 +5-Vdc power supplies provide power to the logic cards. A pair of +12-Vdc power supplies provides power to the fans and to the drive modules. Both the 5 Vdc and 12 Vdc power supplies are fully redundant. If one of the power supplies fails, the other power supply provides the full +5Vdc or +12Vdc needed to operate the cabinet. This is a convenience feature designed into the system to keep your Octel 350 running should one of the 012-2037-000 power supplies fail during normal operation. If the that happens, the Octel 350 sends out a code to let you know that a power supply has failed and the inline backup has gone live. In this way your system will not go down. However, it is important to replace the failed 012-2037-000 power supply so you will be guaranteed system operation should the backup power supply also fail.