Dell PE R720XD Owner's Manual page 102

Figure 62. Removing and Installing the 3.5 Inch (x12) SAS/SATA Backplane—PowerEdge R720xd
1. release tabs (2)
2. pass-through I2C cable
3. left control panel cable
4. I2C cable
5. power cable A
6. USB cable
7. SAS cables (3)
102
8. power cable B
9. front I/O cable
10. right control panel cable
11. x12 hard-drive backplane
12. hard-drive backplane connectors (12)