Sun Microsystems 6.0005E+11 manual Distribution, Peripheral Power Supply

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6.2 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.

6.3 Peripheral Power Supply

The peripheral power supply in Figure 6-1 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 6-1Peripheral Power Supply

Power Supplies 6-3