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Appendix D
Rules for System Configuration
D-3
D.1.4
Power Supplies and Fan Cooling
1. Requirement — The fans in the power/cooling modules (PCMs) provide cooling
air only for the two adjacent board slots. Do not install a board in a slot that is not
cooled by a PCM.
2. Requirement — You must fill all empty slots (board slots and power supply slots)
to avoid loss of cooling air to the active boards. For further information on this
subject, see Section D.1.5 “Filler Panels and Load Boards.”
3. Under some circumstances, you may remove a power/cooling module from an
active system for a short time. However, if the boards in the adjacent slots create
large quantities of heat, it is safer to halt and power off the system first.
D.1.5
Filler Panels and Load Boards
1. Requirement — All empty board slots must be filled with filler panels or load
boards.
2. Requirement — For Enterprise 6500 systems, use load boards. A load board (part
number 501-3142) is identified by the presence of connector sockets and passive
circuitry, which reduces electrical noise at the center plane. Do not substitute filler
panels, which do not have load circuits.
3. Requirement — For Enterprise 5500 and 4500 systems, use filler panels (part
number 540-2592).
4. Requirement — Filler panels are required for all unused PCM bays.
D.2
SBus Modules
1. Install double-wide SBus cards only on the SBus+ I/O board, at SBus slots 1 and
2. The location of SBus slot 0 prevents its use with double-wide cards.
2. Double-wide SBus cards cannot be used with the G I/O board. The
middle card connector does not fit SBus cards.
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