The I/O subsystem consists of the local I/O interface (QBB) and the remote I/O interface (PCI box) connected by I/O cables.

A system can have up to 16 PCI boxes. To identify PCI boxes in a system, a node ID is set using the node ID switch located on the rear panel of each PCI box (see Figure 3–11).

GS160/320 System Configuration Rules 3-19

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Compaq GS320, GS80 manual GS160/320 System Configuration Rules