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1.3a.1.1 DNCP Series 400 (PA-8500) Cabinet: Front Components
For the components housed in the front of the cabinet, See Figure 1.2 which is also described in the following
paragraphs.
Figure 1.2. DNCP Series 400 (PA-8500) Cabinet: Front View
The amber cabinet fault light, located at the top of the cabinet frame, above the doors, illuminates when one or more
components within the cabinet have failed. (For a more detailed explanation of system status lights, refer to the Appendix.
The power trays are located just below the cabinet fault light:
Power Tray 2 (on the top) includes two power supply units to power the PCI card cage bays. At the base of Power
Tray 2 are two Alarm Control Units (ACUs). The ACUs control the speed of the cabinet fans, monitor the status of
components within the cabinet, and control the component status lights. One ACU is online, while the other is in
standby mode.
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Power Tray 1 (below Power Tray 2) includes two rectifiers to convert AC power to the necessary DC voltage for
the entire system.
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Below the power trays are two disk shelves. Each disk shelf has nine slots, the two leftmost slots are reserved for two disk
power supply units, the other slots house up to seven 9GB or 18GB Small Computer System Interface (SCSI) disk drives.
Chapter 1