Dell PE R720XD Owner's Manual page 94

3. backplane signal cable
4. backplane power cable A
5. SAS B cable
Figure 54. Cabling Diagram—3.5 Inch (x8) SAS/SATA Backplane—PowerEdge R720
1. cable retention bracket
2. system board
3. integrated storage controller card
4. SAS connector (mini PERC SAS) on the system board
5. SAS connectors on the backplane (2)
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6. backplane power cable B