Ac Power; Fans; I/O Boats - Sun Microsystems SPARC Enterprise T5120 Installation And Service Manual

1.1.2.1

AC Power

The PSU slots are powered through internal AC cables that extend out of the rear of
the chassis (
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.
1.1.3

I/O Boats

The External I/O Expansion Unit can contain up to two I/O boats (
Note – The maximum number of I/O boats that can be attached to a server can vary
according to the server model. See
TABLE 1-1
Server Model
SPARC Enterprise T5120 Server
SPARC Enterprise T5140 Server
SPARC Enterprise T5220 Server
SPARC Enterprise T5240 Server
SPARC Enterprise T5440 Server
1-6 External I/O Expansion Unit Installation and Service Manual for SPARC Enterprise T5xxx Servers • April 2011
).
FIGURE 1-2
Number of I/O Boats Per Server
.
TABLE 1-1
Maximum Number of I/O Boats Supported
1
2
2 (Maximum of 1 I/O boat per processor)
2 (Maximum of 1 I/O boat per processor)
4 (Maximum of 1 I/O boat per processor)
).
FIGURE 1-4