Figure 422. SAS/SATA cable routing to CFF expander and CFF 16i adapter
From To
1  Backplane 1: SAS 1  CFF expander: C0
2  Backplane 2: SAS 2  CFF expander: C1
3  Backplane 3: SAS 3  CFF expander: C2
4  CFF adapter: MB (CFF INPUT)
4  Onboard: PCIe 2
5  CFF expander: RAID/HBA 5  CFF adapter 
•  C0
•  C1
6  CFF adapter: PWR
6  Onboard: CFF RAID/HBA PWR
7  CFF expander: PWR
7  Onboard: CFF EXP PWR
400 ThinkSystem SR665 V3 User Guide