Compaq GS320, GS160, GS80 System Box Architecture, System Box Block Diagram 16-Processor System

2.2System Box Architecture

The system box houses two quad building blocks (QBBs). Each QBB has a backplane with a switch interconnect that supports up to four CPU modules, four memory modules, two power modules, two I/O riser modules, and a global port. Figure 2–2 shows two system boxes connected by the hierarchical switch. Figure 2–3 shows one system box and the distribution board.

Figure 2–2 System Box Block Diagram (16-Processor System)

Modem

PCI Box

Standard

I/O SCM

Operator PCI Box

Console

PCI Box

PCI Box

PCI Box

PCI Box

PCI Box

PCI Box

System Box 1

CPU CPU CPU CPU
I/O	Switch	GP
MEM MEM MEM MEM

CPU CPU CPU CPU
I/O	Switch	GP
MEM MEM MEM MEM

System Box 2

CPU CPU CPU CPU
I/O	Switch	GP
MEM MEM MEM MEM

CPU CPU CPU CPU
I/O	Switch	GP
MEM MEM MEM MEM

Hierarchical

Switch

PK-0623-98

2-4 AlphaServer GS80/160/320 User’s Guide