Dell PowerEdge T620 Owner's Manual page 98

Figure 52. Removing and Installing 2.5 Inch (x32) SAS/SATA Backplane With a Single PERC Card
1. signal cable
2. release pin
3. power connector
4. SAS A cable
5. SAS B cable
6. SAS A1 cable
7. SAS B1 cable
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8. signal cable
9. power cable
10. SAS A1 cable
11. SAS B1 cable
12. backplane