Service manual

1-58 AlphaServer GS80/160/320 Service Manual
1.14 Local I/O Riser Modules
There are two local I/O riser modules: one for the GS160/320 QBBs and
another for the GS80 QBBs.
1.14.1 System Box Local I/O Riser Module
The system box local I/O riser module provides two I/O port interfaces
to the QBB and two connections for I/O cables connected to the PCI I/O
subsystem through remote I/O riser modules in PCI boxes. The module
may be removed while other parts of the system remain operational.
There may be up to two optional local I/O risers in each QBB.
Figure 1– 25 System Box Local I/O Riser Module Block Diagram