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Identifying Server Components 3
■ “Identifying FRUs in SPARC Enterprise T5120 Servers” on page 181
■ “Identifying FRUs in SPARC Enterprise T5220 Servers” on page 195
Infrastructure Boards in SPARC
Enterprise T5220 Servers
SPARC Enterprise T5220 servers are based on a 2U chassis family. The following
table provides a summary of the circuit boards used in these servers.
Board Description
Motherboard This board includes two CMP modules, slots
for 16 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 configuration 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 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)
This board carries 12V power from the power
supplies to the power distribution board over
a pair of bus bars.
In SPARC Enterprise T5120 servers, the power
supplies connect directly to the power
distribution board.
Paddle card This board serves as the interconnect between
the power distribution board and the fan
power boards, disk drive backplane, and front
I/O board.
Fan power boards (2) These boards carry power to the system fan
modules. In addition, these boards contain fan
module status LEDs and transmit status and
control data for the fan modules.