Installation Guide, Third Edition - Server Expansion Unit

Chapter 1
Introduction
Detailed Server Expansion Unit Description
13
Server Expansion Unit Description
Dimensions
The dimensions of the Server Expansion Unit are as follows:
• Width: 17.5 inches, constrained by electronic industries alliance (EIA) standard 19-inch racks.
• Depth: Defined by cable management constraints to fit into a standard 36-inch deep rack:
* 25.5 inches from front rack column to PCI connector surface.
* 26.7 inches from front rack column to core I/O connector surface.
* 30 inches overall package dimension, including 2.7 inches protruding in front of the front rack columns.
• Height: 9U (15.75 inches) constrained by package density.
System Chassis
Refer to Figure 1-7 on page 14 during the following discussion.
The mass storage section located in the front allows access to removable mass storage devices without
removal of the bezel (not shown.) The mass storage bay accommodates two 5.25-inch removable media devices
and up to four 3.5-inch hard drives. The front panel display board, containing LEDs and the system power
switch, is located directly above the hard drive media bays.
Below the mass storage section and behind a removable bezel are two PCI DC-to-DC power supplies. Each
power supply powers only one I/O partition.
The bulk power supply (BPS) section is partitioned by a sealed metallic enclosure located in the bottom of the
package. This enclosure houses the two fully redundant BPSs.