IBM RS/6000 7025 manual Cable to backplane D Or E as shown

6.	Install		an additional SCSI-2 adapter or					RAID adapter (if necessary) in one of
	empty PCI expansion slots. Refer to						“Installing Adapters” on page 5-30 for
	installation instructions; then				continue		to		the next step.
7.	Attach	cables to backplane D or E.
	a. When			installing a hot swap backplane,					connect the connector from the
	EPOW	cable to backplane D				or E as shown.

Chapter 5. Installing Options5-61