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Appendix B Components B-15
■ The XBU has a normal mode and a degraded mode. In normal mode, all eight sets
operate; and in degraded mode in which a failure has occurred, the four sets
containing the failed set are disconnected, and operation continues with the
remaining four normal sets. If an XB fails, the system is shut down to disconnect
the four sets including the failed XB, and it is then automatically recovered.
■ A dedicated LSI chip is used for the crossbar switch (XB).
■ For the bus connecting CMU and XBU, a high-speed link is used.
■ For the bus connecting the IOU and XBU and the bus connecting XBUs of the base
cabinet and expansion cabinet, a high-speed link is being used.
■ The XBU has a label bearing the printed component number and manufacture's
serial number.