2SPARC Enterprise T5120 and T5220 Servers Service Manual • July 2009
Infrastructure Boards in SPARCEnterprise T5120 Servers

SPARCEnterprise T5120 servers are based on a 1U chassis family. The following

table provides a summary of the circuit boardsused in these servers.

Related Information
■“Infrastructure Boards in SPARCEnterprise T5220 Servers” on page 3
Board Description
Motherboard This boardincludes two CMPmodules, slots
for16 FB-DIMM, memory control subsystems,
and all service processor(ILOM) logic. It also
hosts a removable SCC module, which
contains all MAC addresses,host ID,and
ILOM configurationdata.
Power distribution board This boarddistributes main 12V power from
the power supplies to the restof the system.
Thisboard is directly connected to the paddle
card,and to the motherboard via a bus bar
and ribbon cable. This boardalso supportsa
top cover safety interlock (“kill”) switch.
Paddle card Thisboard serves as the interconnect between
the power distribution board and the fan
powerboards, disk drive backplane, and front
I/O board.
Fan power boards(2) These boardscarry power to the systemfan
modules.In addition, these boards contain fan
module status LEDs and transmit status and
controldata for the fan modules.
Harddrive backplane This boardincludes the connectors for the
harddrives. This board also contains the
interconnectfor the front I/O board, Power
and Locator buttons, and system/component
status LEDs.
Eachdrive has its own Power/Activity, Fault,
and Ready-to-Remove LEDs.
FrontI/O board Thisboard connects directly to the hard drive
backplane. This board is packaged with the
DVD drive as a single unit.