Cable From To
3  SAS signal cable for front 
backplane 2
SAS 0 and SAS 1 connectors on front 
backplane 2
C0 and C1 connectors on the 16i 
RAID adapter installed in PCIe slot 4
4  Power cable for front backplane 2 Power connector on front backplane 
2
Backplane power connector 2 on the 
system board
5  Power cable for front backplane 3 Power connector on front backplane 
3
Backplane power connector 3 on the 
system board
6  SAS signal cable for front 
backplane 3
SAS 0 and SAS 1 connectors on front 
backplane 3
C2 and C3 connectors on the 16i 
RAID adapter installed in PCIe slot 4
74 ThinkSystem SR650 Setup Guide