Compaq GS160, GS80, GS320 manual Sample System Architecture

1.3System Architecture

Each QBB in a GS160/320 system and each QBB (system drawer) in a GS80 system has a backplane and a switch supporting the CPU modules, memory modules, and I/O riser modules. Figure 1–2 shows two QBBs in a single-box system.

Figure 1–2 Sample System Architecture

To PCI Boxes

To PCI Boxes

System Box

CPU	CPU	CPU	CPU
I/O	Switch		GP
MEM	MEM	MEM	MEM
			Distribution
			Board
CPU	CPU	CPU	CPU
I/O	Switch		GP
MEM	MEM	MEM	MEM
			PK-0601A-98

The backplane of each QBB (GS160/320 systems) and drawer (GS80 rack systems) contains the switch that interconnects the CPU modules, memory modules, and I/O riser modules.

The global port and distribution board provide the interconnect for the QBBs. In a two-box system, a hierarchical switch is used as the interconnect, in place of the distribution board.

I/O riser modules connect the PCI boxes to the QBB backplane.

Introduction 1-5