Dell PowerEdge R920 Owner's Manual page 104

Figure 58. 2.5 Inch (x24) SAS/SATA Backplane—Front view
1. jumper connector
3. SAS connector
5. backplane loops
7. backplane jumper connector
Figure 59. 2.5 Inch (x24) SAS/SATA Backplane—Back view
1. backplane power connector 1
3. system board miscellaneous signal cable
104
2. hard drive connector
4. hard drive connector
6. backplane hook (8)
2. backplane power connector 2