Dell External OEMR XL T620 Owner's Manual page 101

Figure 49. Cabling—3.5 Inch (x8) SAS/SATA Backplane With a Single PERC Card
1. power connector on backplane
2. SAS A connector on backplane
3. SAS B connector on PERC card
4. SAS A connector on PERC card
5. Power connector on PDB
6. signal cable on system board
7. signal cable on backplane
8. SAS B connector on backplane
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