The CPU, memory, power, and I/O riser modules plug into the backplane. Because of the orientation of the QBB backplanes, the modules are situated differently in the front and rear of the system box. See Section 3.5 for more information.

The switch interconnect on the backplane allows any processor to access any memory on the QBB. The backplane also provides power to the modules.

Global port module

Directory module

CPU module

Memory module

I/O riser modules

Clock splitter module

Power system manager (PSM) module

Main power module

Auxiliary power module

GS160/320 System Overview 2-9

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Image 25
Compaq GS80, GS320 manual GS160/320 System Overview