Lenovo ThinkSystem SR650 V2 Maintenance Manual page 114

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 102.
The following shows the cable connections for the 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 48. Cable routing for the two 4 x 2.5-inch SAS/SATA middle backplanes and one 4 x 2.5-inch SAS/SATA rear
backplane
ThinkSystem SR650 V2Maintenance Manual
104
To
CFF expander: C3
CFF expander: C4
Riser 1: PWR1, PWR2
Riser 2: PWR1, PWR2
↔ ↔ ↔
, , , ...
1 1 2 2 3 3
↔
n n