Superdome Servers - I/O Expansion Cabinet Guide, Fifth Edition

Chapter 1
Introduction
Overview
6
I/O Chassis
Each ICE can hold two 12-slot I/O chassis. PCI controller cards interface with cables that approach the I/O
chassis from the front. Cables are attached to the PCI cards from the front of the I/O chassis. The chassis can
be removed with or without extending the ICE tray. Figure 1-5 shows the I/O chassis being inserted into the
ICE.
Figure 1-5 I/O Chassis
XUC
The XUC provides utilities functions and clock distribution for components in the IOX. It is also connected to
the Superdome server by way of a GSP bus link. Each IOX cabinet requires one XUC.
The XUC provides utilities functions and clock distribution for IOX components. These components are the
ICE and XPC. The XUC provides clock signal distribution for the ICEs.
The XUC also provides a connection to the rear display module (RDM).
Cooling is provided by monitored and redundant (N+1=2), hot-swappable fans installed in a module. The fans
operate when Housekeeping voltage is supplied. Housekeeping voltage is converted to 12VDC on the Fan
Power Board (XfanB) located in the XUC fan module. The fans only operate when 48V is present.
Clock and GSP Bus cable shields are terminated at the rear bulkhead by cable mounted ferrules.