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B-38 SPARC Enterprise M8000/M9000 Servers Service Manual • June 2010
B.23 PSU Backplane
PSU backplane (PSUBP) is a PCB that has a connector for interconnecting multiple
power supply units (PSU) concurrently operated. There are two types of PSUBP,
namely the PSUBP_A commonly used for all SPARC Enterprise and the PSUBP_B
for the M8000 only.
The PSUBP is shown in
FIGURE B-34 and FIGURE B-35.
FIGURE B-34 PSU Backplane (PSUBP_A)
FIGURE B-35 PSU Backplane (PSUBP_B)
The PSUBP has the following characteristics.
■ Because the PSUBP is a built-in unit in the cabinet, only cold replacement is
available for the PSUBP.
■ The PSUBP connects the output of PSU to each unit through system backplane
(BP_A or BP_B).
■ PUSBP_A allows connection to up to five PSUs.
■ The PUSBP_B enables connection to up to four PSUs.
■ The PSUBP has a label bearing the printed component number and manufacture's
serial number.