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External I/O Expansion Unit for SPARC Enterprise M
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000 Servers Installation and Service Manual • April 2011
1.1.2.1
AC Power
The PSU slots are powered through internal AC cables that extend out of the rear of
the chassis (item 7 in
The PSUs do not share AC current. Connect both internal AC cables to AC power.
The internal AC cable for a PSU is the cable terminating nearest that PSU slot.
The PSUs should be connected to two independent external AC power sources so
that service will not be interrupted if one AC power source fails.
1.1.2.2
Fans
A fan is located in the front of each PSU. If one fan fails, the remaining fan supplies
enough air to cool two I/O boats.
Note –
The fan might turn on when you insert a PSU into the External I/O
Expansion Unit. This is normal behavior if you are installing a second PSU while the
first PSU is powered on. The fan receives DC power through the centerplane.
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