The switch that interconnects the CPU modules, memory modules, and I/O riser modules is built into the system drawer backplane.

In a two-drawer system, the system drawers are linked together through the global ports and the distribution board. A directory module is required in each system drawer in a two-drawer system.

GS80 Rack System Overview 4-5

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Image 73
Compaq GS160, GS320 manual GS80 Rack System Overview