8i/16i RAID/HBA adapter + 8i RAID adapter (Trimode)
The following shows the cable connections for the 8 x 2.5-inch SAS/SATA + 8 x 2.5-inch Anybay 
configuration with one 8i/16i RAID/HBA adapter and one Trimode 8i RAID adapter for U.3 drives.
From To
Backplane 1: SAS 8i/16i* RAID/HBA adapter on PCIe slot 2:
•  Gen 3: C0C1
•  Gen 4: C0
Backplane 2: SAS Trimode 8i RAID adapter on PCIe slot 3: C0
Note: *If a 16i RAID adapter is used, SAS cable 
1  has an extra dummy connector (not shown in below 
illustration) to connect to the other connector of the 16i RAID adapter.
Connections between connectors: 
1  ↔  1 ,  2  ↔  2 ,  3  ↔  3 , ...  n  ↔  n
Figure 94. Cable routing for the 8 x 2.5-inch SAS/SATA + 8 x 2.5-inch Anybay configuration with one 8i/16i RAID/HBA 
adapter and one Trimode 8i RAID adapter
Chapter 3. Internal cable routing 139