This cable connects the backplane to one of Dells mini mono RAID controllers on the R730xd 12 Bay chassis.
Installation instructions
Plug one end into the backplane and then route the cable through the channel located on the right side of the server. The other end labeled PERC will terminate near the middle right side of the chassis. You will see the slot just before riser 1. Screw it down to a compatible DELL mini RAID controller.