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Caution – Do not configure the Sun Datacenter Switch 3456 with fewer than 18
fabric cards installed. Thermal requirements will not be satisfied.
Configuration Considerations
Filler Panels
To maintain proper airflow for adequate cooling, filler panels must be installed in
vacant line card and power supply slots. Besides directing airflow, the filler panels
close openings to the Sun Datacenter Switch 3456 chassis, preventing intrusion of
objects and contaminants to the chassis interior.
Line Card Distribution
Line cards are installed from the center out, across the available slots. The vacant
slots must have filler panels installed. For example, if only 12 line cards are to be
installed, they would occupy slots 6 through 17. Filler panels are installed in the
vacant slots (0 through 5 and 18 through 23).
Power Supplies
Power supplies are configured in a need+1 redundancy. A fully configured Sun
Datacenter Switch 3456 with 24 line cards and 18 fabric cards needs 14 power
supplies. Two power supplies act as redundant, one for each power bus. The power
supply slots are hard-wired to two power buses. Power supplies installed in the
lower row (PS0, PS1, and so on to PS7), provide power to line card slots 0 to 11 and
fabric card slots 9 to 17. Power supplies installed in the upper row (PS8, PS9, and so
on to PS15), provide power to line card slots 12 to 23 and fabric card slots 0 to 8.
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Sun Datacenter Switch 3456 Installation Guide • December 2008
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