Compaq AlphaServer 160 Betriebsanweisung PDF herunterladen (Seite 15)

Introduction 1-5

1.3 System 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

System Box

CPU

MEM

I/O GP

CPU CPU CPU

Switch

MEMMEMMEM

Distribution

Board

To PCI Boxes

To PCI Boxes

CPU

MEM

I/O GP

CPU CPU CPU

Switch

MEMMEMMEM

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.

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