IBM Power 780 Technical Overview And Introduction page 80

In the rear of the rack, the FSP cables require only some room in the left side of the racks, as
Figure 2-16 shows.
Figure 2-16 Rear view of rack with detail of FSP flex cables
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IBM Power 770 and 780 (9117-MMD, 9179-MHD) Technical Overview and Introduction
Two Drawer Cable
Three Drawer Cable
Four Drawer Cable