Fujitsu SPARC ENTERPRISE M8000 Manual de usuario Pagina 460

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B-14 SPARC Enterprise M8000/M9000 Servers Service Manual August 2009
B.9 Crossbar Unit
A crossbar unit (XBU: formal abbreviation is XBU_B) is mounted only in the SPARC
Enterprise M9000 server. The XBU consists of a connector and a crossbar switch
(XB). The connector is used to physically connect a CMU and IOU, and the XB
switches logical connections and controls data transfer between the CMU and IOU.
Up to eight XBUs can be mounted in a cabinet.
FIGURE B-9 shows the XBU_B.
FIGURE B-9 Crossbar Unit (XBU_B)
The XBU has the following characteristics.
Only cold replacement is available for the XBU.
In the SPARC Enterprise M9000 server (with an expansion cabinet) model, control
over the expansion cabinet is done by connecting the XBUs of both base cabinet
and expansion cabinet with cables.
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