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38 Sun Fire V490 Server Administration Guide • August 2004
■ J1103 – Labeled “Hi-Lo” on the PCI riser board, this jumper is reserved for future
use.
■ J1104 – Labeled “WREN” on the PCI riser board, this jumper controls write
permissions for the system Boot PROM. In the default position with the shunt
covering pins 1 and 2, the system Boot PROM is write-enabled. Moving the shunt
to the other position prevents updating the PROM.
About the Power Supplies
A central power distribution board (PDB) delivers DC power to all internal system
components. The system’s two standard power supplies—called Power Supply 0
and Power Supply 1—plug in directly to connectors on this board, and all of the
supplies installed share equally in satisfying the power demands of the system. AC
power is brought into the PDB by way of two board-mounted IEC320 receptacles,
each dedicated to one power supply.
The Sun Fire V490 system’s N+1 redundant power supplies are modular units,
designed for fast, easy installation or removal, even while the system is fully
operational. Power supplies are installed in bays at the front of the system, as shown
in the following figure.
FIGURE 3-7 Power Supply Locations
The power supplies operate over an AC input range of 200–240 VAC, 50–60 Hz,
without user intervention. The power supplies are capable of providing up to 1448
watts of DC power. The basic system configuration comes with two power supplies
installed, either of which is capable of providing sufficient power for a maximally
configured system.
L
ocation of Power Supply 0 Location of Power Supply
1