| 摘要 |
A high-density system includes a backplane, a plurality of central processing unit (CPU) cards, and a servicing control system. The backplane has a servicing input/output (I/O) bus for carrying servicing I/O data. The central processing unit (CPU) cards are plugged into the backplane and connected to the servicing I/O bus. The servicing control system includes a switching system for selectively connecting only one of the CPU cards to the servicing I/O bus, and an I/O interface module electrically connected to the servicing I/O bus. The I/O interface module comprises at least a port to which an external device may be plugged. The servicing control system selectively enables only one of the CPU cards to send servicing I/O data to the port or to receive servicing I/O data from the port.
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