Power Components - Silicon Graphics Origin 300 User Manual

1: Introduction

Power Components

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The SGI Origin 300 system with NUMAlink module can consist of the following power
components:
• One or two power distribution units (PDUs) (refer to Figure 1-11) - The second PDU
is added to the system when more than 15 AC power receptacles are needed within
the rack.
The PDU inputs AC voltage from an external power receptacle and it can output
AC voltage to the Origin 300 base modules, an AC-powered NUMAlink module,
optional SGI Total Performance 900 (TP900) storage modules, USB hub, power bay
module, power strip, and Myrinet-2000 switch.
• One power strip - The power strip exists in the system when the system requires 11
to 15 AC power receptacles.
The power strip inputs AC voltage from the PDU and it can output AC voltage to
the Origin 300 base modules, an AC-powered NUMAlink module, optional TP900
storage modules, USB hub, power bay module, and Myrinet-2000 switch.
• One power bay module (refer to Figure 1-12) - The power bay module exists in the
system when the system contains a DC-powered NUMAlink module or a PCI
expansion module.
The power bay module inputs AC voltage from a PDU or power strip and converts
this AC voltage to 12 Vdc standby voltage and 48 Vdc. The power bay outputs this
voltage to the DC-powered NUMAlink module, the L2 controller, and PCI
expansion modules. The 48 Vdc powers on the NUMAlink module, the PCI
expansion modules, and the L2 controller. The 12 Vdc standby voltage powers on
the L1 controller logic within the NUMAlink module and the PCI expansion
modules.
The power bay module can house up to six power supplies; however, this system
requires only two or three power supplies. The third power supply is required
when the system has four PCI expansion modules. The outputs of the power
supplies are bused together. For example, when the power bay contains two power
supplies, the supplies provide the following power in an N+1 redundant
configuration: 1840 W at 48 Vdc and 90 W at 12 Vdc standby.
• One power supply - When the system has an AC-powered NUMAlink module, the
L2 controller receives power from a power supply that is attached to the side of the
rack. This power supply receives AC voltage from a PDU or power strip and
converts the voltage to 48 Vdc, which is the input voltage that the L2 controller
requires.
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