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4-4 AlphaServer GS80/160/320 User’s Guide
4.2 System 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
System Drawer 1
System Drawer 2
CPU
MEM
I/O GP
CPU CPU CPU
Switch
MEMMEMMEM
Distribution
Board
CPU
MEM
I/O GP
CPU CPU CPU
Switch
MEMMEMMEM
PCI Box
PCI Box
PK-0630-99