Dell PowerEdge T620 Owner's Manual page 88

Figure 42. Removing and Installing a 3.5 Inch (x8) Plus 2.5 Inch (x4) SAS/SATA Backplane
1. PCIe C cable
2. power connector
3. PCIe D cable
4. PCIe B cable
5. signal cable
6. PCIe B cable
7. power cable
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8. release pin
9. SAS B cable
10. signal cable
11. SAS A cable
12. backplane