User Service Guide, Fifth Edition - HP Integrity rx8640 SEU

Figure 1-2 SEU (Without Front Bezel)
Features include:
• Better availability and up time than previous SEU
• Depth optimized (shallower, fewer racking issues)
• Increased performance density
• Increased PCI-X performance
• Internal removable media
• Up to four additional internal disks
• Dual power cords enable N+1 redundancy on AC input
• Up to sixteen additional PCI-X slots
• Combination of eight additional PCI-X slots and eight additional PCI-e slots (with PCI-X/PCIe
backplane).
• Core I/O functionality
• Up to two additional partitions for the server connected to the SEU
SEU System Backplane
The backplane provides inter-connection between the PCI backplane and the core I/O backplane.
The backplane also provides a connection point for the system bus adapter (SBA) link and routes
the SBA link signals to and from the PCI backplane board using a pair of high speed serial
unidirectional links known as E-link cables. The backplane receives primary (48 V) and standby
(12 V) power from the bulk power supplies and distributes this power to loads on the backplane
and to the other boards connected to it. Besides providing interconnect, the backplane also
16 Server Expansion Unit Overview