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B-46 SPARC Enterprise M8000/M9000 Servers Service Manual • October 2012
B.26 Switch Backplane
The Switch backplane (SWBP) is a PCB that has connectors to connect Media BP to multiple
IOUs. The SWBP is a unit that switches between IOUs to set which IOU is to control the
CD-RW/DVD-RW drive unit and the tape drive unit (TAPEU). One SWBP unit can be
mounted on the M8000 and M9000 (base cabinet), and two units can be mounted on the
M9000 (with expansion cabinet).
FIGURE B-41 shows the SWBP.
FIGURE B-41 Switch Backplane (SWBP)
The SWBP has the following characteristics.
■ Only cold replacement is available for the SWBP.
■ Twelve ports of expander are mounted to control eight IOUs, one CD-RW/DVD-RW drive
unit, and one tape drive unit.
■ The XSCF controls the settings for switching.
■ It supplies the power (12 V, 5 V) to Media backplane (CD-RW/DVD-RW drive unit and
tape drive unit).
■ The SWBP has a label bearing the printed component number and manufacture's serial
number.