Compaq GS160, GS80, GS320 manual System Drawer Architecture, Two-Drawer Block Diagram

4.2System Drawer Architecture

The system drawer houses a QBB consisting of a backplane that supports four CPU modules, four memory modules, two power modules and two I/O riser modules. These modules are identical to those used in the box systems. The global port is part of the backplane. In a two- drawer system, the drawers are linked by a distribution board.

Figure 4–2 Two-Drawer Block Diagram

PCI Box

PCI Box

PCI Box

System Drawer 1

CPU	CPU	CPU	CPU
I/O	Switch		GP
MEM	MEM	MEM	MEM
			Distribution
System Drawer 2			Board
CPU	CPU	CPU	CPU

I/O	Switch			GP
MEM	MEM	MEM	MEM

PCI Box

PK-0630-99

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