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Power Supplies 7-3
7
7.2 Distribution
In the 16-slot and 8-slot systems there is a single peripheral power supply and
a slot for a PCM for each pair of board slots. There is a single alternating
current (AC) power cord for the whole system. AC is then distributed to each
of the PCMs within the chassis. The software monitors the status of the AC
power source. Current-sharing between power supplies provides redundant
power.
7.3 Peripheral Power Supply
The peripheral power supply in Figure 7-1 provides power to the peripheral
subsystems, the drives, the fans in the AC box, and the fan in the keyswitch
box. The PPS provides auxiliary 5V output to power the remote console. This
power supply incorporates current sharing to operate in redundant and
parallel operations. The peripheral power supply provides three precharge
outputs (3.3V, 5V, and 12V) to enable hot plug-in of system boards, PCMs, or
drives into an active centerplane.
In addition, the peripheral power supply incorporates current sharing on the
5V output for parallel operation with PCMs. Consequently, if a PCM fails, the
PPS provides redundant 5V output through the centerplane to the system
boards.
Figure 7-1 Peripheral Power Supply