Connecting signal cables to two backplanes
When there are two backplanes installed, see the following illustrations for cable routing. 
8-bay backplane + 8-bay backplane
Two options are available for this combination:
Attention: When installing a 8-bay backplane and a AnyBay backplane, always install the 8-bay backplane to 
drive bay 0-7, and the AnyBay backplane to drive bay 8-15. 
1.  With SATA/SAS RAID adapter (16i)
Figure 31. Cable routing, 8-bay backplane + 8-bay backplane
Table 28.  Cables and adapters for routing
1  SATA/SAS RAID adapter (16i) 3  SATA/SAS signal cables (720 mm)
2  SATA/SAS signal cables (900 mm)
36 ThinkSystem SR850 Maintenance Manual