Infrastructure Boards; System Cables - Sun Microsystems Sun Fire X4450 Service Manual

1.2.1

Infrastructure Boards

The Sun Fire X4450
boards are listed in
Infrastructure Boards
TABLE 1-2
Board Description
Motherboard The motherboard includes CPU modules, a removable tray with
slots for 32 DIMMs, memory control subsystems, and the service
processor (lights out management (LOM)) subsystem.
The service processor (LOM) subsystem controls the host power
and monitors host system events (power and environmental).
The LOM controller draws power from the host's 3.3V standby
supply rail, which is available whenever the system is receiving
AC input power, even when the system is turned off.
Power distribution This board distributes main 12V power from the power supplies
board to the rest of the system. It is directly connected to the paddle
card, and to the motherboard via a bus bar and ribbon cable. It
also supports a top cover interlock ("kill") switch.
In the
power distribution board.
Paddle card This board serves as the interconnect between the power
distribution board and the fan power boards, Drives backplane,
and I/O board.
Fan power boards These boards carry power to the system fan modules. In
(2) addition, they contain fan module status LEDs, and transfer I
data for the fan modules.
Drives backplane This board includes the connectors for the drives, as well as the
interconnect for the I/O board, Power and Locator buttons, and
system/component status LEDs. The
eight-disk backplane. Each drive has an LED for power/activity,
fault, and ok-to-remove.
Front I/O board This board connects directly to the drives backplane. It is
packaged with the DVD drive as a single unit.
PCIe risers There are three risers per system, each attached to the rear of the
motherboard. In the Sun Fire X4450 server, each riser supports
two PCIe cards.
1.2.2

System Cables

The
Sun Fire X4450
1-4 Sun Fire X4450 Server Service Manual • November 2009
server has the following boards installed in the chassis. The
TABLE 1-2
Sun Fire X4450 , the power supplies connect directly to the
server internal cables are shown in
.
Sun Fire X4450
Reference
Section 4.8, "Servicing
the Motherboard
Assembly" on page 4-29
Section 5.5, "Servicing
the Power Distribution
Board (PDB)" on
page 5-12
Section 5.7, "Servicing
the Paddle Card" on
page 5-17
Section 5.1, "Servicing
2
C the Fan Power Boards"
on page 5-2
Section 5.3, "Servicing
the Drives Backplane"
has an on page 5-8
Section 3.5, "Servicing
the DVD/USB Module"
on page 3-21
Section 4.5, "Servicing
PCIe Risers" on
page 4-20
.
FIGURE 1-1