Identifying Server Components 3
■“Identifying FRUs in SPARCEnterprise T5120 Servers” on page 181
■“Identifying FRUs in SPARCEnterprise T5220 Servers” on page 195
Infrastructure Boards in SPARCEnterprise T5220 Servers

SPARCEnterprise T5220 servers are based on a 2U chassis family. The following

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

Board Description
Motherboard This boardincludes two CMP modules, 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 board also supports a
top cover safety interlock (“kill”) switch.
Power supply backplane (SPARC
Enterprise T5220 Servers only)
Thisboard carries 12V power from the power
suppliesto thepower distribution board over
a pair of bus bars.
InSPARC Enterprise T5120 servers, the power
supplies connect directlyto the power
distribution board.
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 system fan
modules.In addition, these boards contain fan
module status LEDs and transmit status and
controldata for the fan modules.