Service manual

System Overview 1-1
Chapter 1
System Overview
The AlphaServer GS80/160/320 systems have two different design centers: one
with a small footprint and up to 8 CPUs, the other with a larger footprint that
expands to 32 CPUs. This chapter describes both types of systems, their
components, and their system enclosures. Most of the components between the
two are interchangeable.
Topics covered in this chapter are:
• GS160/320 System Cabinets
• GS160/320 System Building Block
• GS160/320 System Box
• GS80 Rack Cabinet
• GS80 System Drawer
• Operator Control Panel
• Hierarchical System Architecture
• System Management Architecture
• System Partitioning
• CPU Module
• Memory Module
• Power System Manager Module
• Clock Generation Modules
• Local I/O Riser Modules
• Power Modules
• Directory Module
• Global Port Module
• Global Port Distribution Board
• Hierarchical Switch
• H-switch Power Manager Module
• PCI Subsystem
• GS160/320 System Power
• GS80 System Power
• PCI Power Supply