Server Technical Overview

Power
2-12
Power
Each cell is independently powered. The power system is fully distributed and consists
of the following components.
AC Connections
The AC input for each cell is two 15-ampere line cords. The line cords are connected to
the power strips mounted in the rear of the cell.
AC/DC Power Supplies
The AC/DC power supplies take the AC input power and produce the DC power used by
the cell components. Each cell contains two hot-pluggable AC/DC power supplies. The
power supplies are rated for a maximum of 1800 watts at 200 volts or 1000 watts at 100
volts. Actual cell power consumption is significantly less and is determined by the
system configuration and activity.
The output of the power supplies is 12 volts with a 3.3-volt keep-alive voltage for power
control.
The power supplies are self-cooled.
Figure 2-10
shows the location of the two power supplies on the back of the cell.
Figure 2-10 Power Supplies
Power Supply Indicators
The power supplies have a green LED to indicate the state of the power supply and an
amber LED to indicate a fault or failure in the power supply.
Power Control