IBM F50 RS/6000 7025 - Manual (Page 206)

b. Attach the new power cable to backplane D or E.
c. Connect the other end of the power cable to the power supply.
d. After the connection have been made, neatly place the cables into the power
supply side tray.
e. Locate the SCSI cable.
f. Before connecting the SCSI cable, fill in your SCSI cable labels. Fill in the
bank identifier (D or E) and the adapter slot (such as 1P, 2P, 3P). Refer to
the following illustration to help you label your cable properly.
5-62 IBM RS/6000 7025 F50 Series User's Guide