Power Supplies

There are several types of power supply modules, but all have two LEDs. The locations of the green (power) LED and the yellow (service) LED vary according to the module type.

Peripheral Power Supplies

The system has one peripheral power supply/AC unit (PPS/AC), located at the rear of the cabinet.

The system may also have the optional auxiliary peripheral power supply (PPS), located at the front of the cabinet. If the auxiliary PPS is not installed, the slot contains a thermal protection module.

On both the PPS/AC and the PPS, the green Component Power LED is located above the yellow Service LED. The Component Power LED is lit when the power supply is operating, but does not necessarily indicate that the DC outputs are fully within specification. The yellow Service LED is lit when a DC power output has failed or a voltage level is out of specification.

Power/Cooling Modules

The system has up to three power/cooling modules (PCMs).

Each PCM has two LEDs. The green Component Power LED is located below the yellow Service LED. Table 9-3 summarizes the LED codes for the PCM.