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#### Infrastructure Boards in the SPARC T3-1 Server

The following table provides an overview of the circuit boards used in SPARC T3-1 servers.

Board | Description
--- | ---
Motherboard | This board includes one CMP module, slots for 16 DIMM memory control subsystems, and a pluggable service processor module (Oracle ILOM). It also hosts a removable System Controller module (also called SCC), which contains all MAC addresses and host ID data.
Power distribution board | This board distributes main 12V power from the power supplies to the rest of the system. This board is directly connected to the connector board, and to the motherboard via a bus bar and ribbon cables. This board also supports a top cover safety interlock (“kill”) switch.
Power supply backplane | This board carries 12V power from the power supplies to the power distribution board over a pair of bus bars. It also delivers 3.3V standby power In SPARC T3-1 servers, the power supplies connect directly to the power distribution board.
Connector board | This board serves as the interconnect between the power distribution board and the fan power board, disk drive backplane, and front I/O board.
Fan power board | This board carries power to the system fan modules and fan module status LEDs. It also transmits status and control signals for the fan modules.
Hard drive backplane | This board provides connectors for the hard drive signal cables. It also serves as the interconnect for the front I/O board, Power and Locator buttons, and system/component status LEDs.
Front I/O board | This board connects directly to the hard drive backplane. It is packaged with the DVD drive as a single unit.

##### Related Information

- Internal System Cables

- Cable Routing Diagram for the Onboard SAS RAID Controller

- Cable Routing Diagram for the PCIe SAS RAID HBA

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