Service manual

System Overview 1-1
Chapter 1
System Overview
This chapter introduces the DIGITAL AlphaServer 4000 and the DIGITAL
AlphaServer 4100 systems. These systems are available in cabinets or pedestals.
There are three system drawers; two, the BA30B and the BA30C, are used in the
AlphaServer 4000, and the third, the BA30A, is used in the AlphaServer 4100.
The pedestal system has one system drawer and up to three StorageWorks shelves.
The cabinet system can have a combination of system drawers and StorageWorks
shelves that occupy the five sections of the cabinet.
Topics in this chapter include the following:
• AlphaServer 4100 System Drawer (BA30A)
• AlphaServer 4000 System Drawer (BA30C)
• AlphaServer 4000 System Drawer (BA30B)
• Cabinet System
• Pedestal System
• Control Panel and Drives
• System Consoles
• System Architecture
• System Motherboard
• CPU Types
• Memory Modules
• Memory Addressing
• System Bus
• System Bus to PCI Bus Bridge Module
• PCI I/O Subsystem
• Server Control Module
• Power Control Module
• Power Supply