Lenovo ThinkSystem SR650 V2 Maintenance Manual page 117

Middle and rear backplanes: 8 x 2.5-inch SAS/SATA + 4 x 2.5-inch SAS/SATA
To connect the front backplanes, refer to "Front backplanes: 24 x 2.5-inch SAS/SATA" on page 105.
The following shows the cable connections for two 4 x 2.5-inch SAS/SATA middle backplanes and one 4 x
2.5-inch SAS/SATA rear backplane if installed.
From
Backplane 4: SAS
Backplane 5: SAS
Backplane 6: SAS
Backplane 4: PWR
Backplane 5: PWR
Backplane 6: PWR
Connections between connectors:
Figure 51. Cable routing for the 4 x 2.5-inch SAS/SATA middle backplanes and 4 x 2.5 SAS/SATA rear backplane
To
CFF expander: C3
CFF expander: C4
Riser 1: PWR1, PWR2
Riser 2: PWR1, PWR2
↔ ↔ ↔
, , , ...
1 1 2 2 3 3
↔
n n
.
Chapter 3 Internal cable routing
107