8i RAID adapter (Trimode)
The following shows the cable connections for the 8 x 2.5-inch Anybay configuration with one Trimode 8i 
RAID adapter for U.3 drives.
From To
Backplane 1: SAS Trimode 8i RAID adapter on PCIe slot 2: C0
Connections between connectors: 
1  ↔  1 ,  2  ↔  2 ,  3  ↔  3 , ...  n  ↔  n
Figure 82. Cable routing for the 8 x 2.5-inch Anybay configuration with one Trimode 8i RAID adapter
130 ThinkSystem SR650 V2Maintenance Manual