The QBB backplanes are attached to a stiffener and mounted in a system box enclosure. Each backplane has a differently positioned cutout to accommodate the global port modules. A global port module is mounted on the front of one QBB and the other is mounted on the back of the other QBB, putting both global port modules near the distribution board (or the hierarchical switch) when the system box is installed in the cabinet.

The callouts in Figure 2–4 point to the location of these components in the system box:

I/O riser module area. Each QBB supports up to two I/O riser modules.

CPU module and memory module area. Each QBB holds four CPUs and four memory modules.

Global port area.

Backplane area.

GS160/320 System Overview 2-7

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Compaq GS320, GS80 manual GS160/320 System Overview