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Air Restrictor Board
An air restrictor board is a blank board with a air deflector fin to simulate the
airflow pattern of an actual board. If air restrictor boards are not installed in
blank slots, a "thermal short" condition is created. Thermal shorts severely
reduce the system cooling capability, which can lead to equipment damage.
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Backplane
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The backplane is located in the center of the chassis. The power supply
connects on one side of the backplane and the disk cards connect on the other.
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Board
The term board refers to printed circuit boards larger than a certain size (for
example, larger than 3x5-inch SBus cards and SPARC modules).
The disk card is the only board type installed in this system.
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Card Cage
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By convention, boards are installed in a card cage, rather than a board cage.
The system card cage is the portion of the system accessed from the enclosure
that contains up to four boards. The card cage provides card guides on either
side which serve to guide the board into the backplane.
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Disk card
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An optional SCSI-2 disk expansion board featuring four 3 1/2-inch disk drives.
The card cage can accommodate up to four, residing in slots 0-3.
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Key Switch
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The key switch on the system front panel has two positions. This switch is set
to On at the factory and should be left in that position.
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FRU (Field Replaceable Unit)
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Field replaceable units are server subassemblies which can be replaced at the
customer site by trained, qualified service personnel.