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 To
Backplane 4: SAS
CFF expander: C3
Backplane 5: SAS
Backplane 6: SAS CFF expander: C4
Backplane 4: PWR
Riser 1: PWR1, PWR2
Backplane 5: PWR
Riser 2: PWR1, PWR2
Backplane 6: PWR
Connections between connectors: 
1  ↔  1 ,  2  ↔  2 ,  3  ↔  3 , ...  n  ↔  n
Figure 51. Cable routing for the 4 x 2.5-inch SAS/SATA middle backplanes and 4 x 2.5 SAS/SATA rear backplane
Chapter 3. Internal cable routing 107