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Appendix B Components B-15
FIGURE B-8 External I/O Expansion Unit Connection Card (PCIB-EX)
The PCIB-EX has the following characteristics.
■ Active maintenance of a PCIB_EX is possible using the PHP function.
■ Active installation or removal of PCI cards (including link cards) is possible using the
PHP function.
■ The maximum cable length for a card is 25 m.
B.9 Crossbar Unit
A crossbar unit (XBU: formal abbreviation is XBU_B) is mounted only in the 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.