Compaq GS160 - Manual (Page 38)

2-20 AlphaServer GS80/160/320 User's Guide
2.3.11 Hierarchical Switch
In two-box systems, a hierarchical switch links the QBBs through the
global ports.
The hierarchical switch connects QBBs in three- and
four-box systems also.
Figure 2–16 Hierarchical Switch
System
Box 2
System
Box 4
System
Box 3
System
Box 1
PK0626