Service manual

1-4 AlphaServer GS80/160/320 Service Manual
1.2 GS160/320 System Building Block
The basic system building block for these systems is the quad building
block or QBB. A QBB consists of a backplane, up to four CPUs, up to
four memory modules, a directory module, up to two I/O riser modules,
a global port, two power modules, a power system manager module,
and a clock splitter module. The maximum number of QBBs in a GS160
is four and in the GS320 is eight. Each QBB has an ID number from 0 to
7.
Figure 1– 2 Quad Building Block Backplane
PK1505-99
2 3 4 5 4 5 6
110 5 4 5 4 11 12 13
1 7
19
8