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Appendix B Components B-5
■ For the bus connecting SC and SC as well as SC and crossbar unit, a high-speed
link is used.
■ For the bus connecting SC and MAC as well as SC and CPU, a high-speed link is
used.
■ For the memory, DIMM is used.
■ The CMU has a label bearing the printed component number and manufacture's
serial number.
B.2 CPU Module
CPU module consists of CPU and DDC. Up to four CPU modules can be mounted
on a CMU. There are four types of CPU modules.
FIGURE B-2 shows the CPU module.
FIGURE B-2 CPU Module
The CPU module has the following characteristics.
■ Active maintenance of CPU modules is possible using the DR function.
■ To perform active maintenance, you need to pull out the CMU from the system
before replacing the target CPU module.