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Power Subsystem
The SRKA4 MP Server System uses a universal input-switching power subsystem (PSBS). This
subsystem provides up to 630 Watts DC. The subsystem also minimizes the RMS current drawn
from each AC line by providing power factor corrected AC input. The chassis can be configured
with one, two, or three 350-Watt power supply modules. Each module is designed to minimize
electromagnetic interference (EMI) and radio frequency interference (RFI).
The power subsystem consists of a power subsystem bay and up to three power supply modules.
The power supply modules are noted by "A" in Figure 18. The power subsystem bay contains a
power distribution board, which manages the power delivered by all functional power supplies.
The power subsystem can operate in either a nonredundant or redundant way. Operating in a
nonredundant way means that you are using only one or two power supply modules. If the module
ceases to function normally, the server system cannot function properly, if at all. A minimal
configuration supported by one module is one processor, four memory DIMMs, one hard drive that
is not 10K, one floppy drive, and one CD-ROM.
The safer approach is to use a redundant (2+1) power subsystem. To form a (2+1) redundant
power subsystem, the subsystem parallels the DC output of one power supply module with one or
two other modules. If one module ceases to function normally, the remaining modules provide
power to the server system and the system continues to function properly. Two power supply
modules are required to provide power to a fully configured SRKA4 MP Server System. The third
module provides redundancy. A fully configured system includes four processors, sixteen
gigabytes of memory, one floppy drive, one CD-ROM, five hard drives, and eight PCI add-in
boards.
The SKA4 baseboard contains three embedded voltage converters: two 5 V input and one
12 V input. The baseboard also provides three connectors supporting 8.3-compliant, plug-in
voltage regulator modules (VRM).
A Detailed Description of Chassis Features
A
Figure 18. Power Subsystem
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