Dell PowerEdge R710 Series Hardware Owner's Manual page 184

Figure 6-5. SAS Backplane Board for 3.5-Inch Hard Drives (6 Slots)
1
1 drive 1 connector
3 drive 3 connector
5 drive 5 connector
7 backplane power (BP_PWR)
9 SAS B connector
184
Jumpers and Connectors
2
3
front
9
back
4 5
8
2 drive 0 connector
4 drive 2 connector
6 drive 4 connector
8 SAS A connector
6
7