IBM System x3750 M4 Type 8722 Installation And Service Manual page 126

10. Connect the two interposer cables (that are attached this backplane) to the
11. Connect the SAS signal cables to the two SAS signal connectors on the system
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System x3750 M4 Types 8722 and 8733: Installation and Service Guide
signal connectors on the other backplane in this configuration. The shortest
cable connects to the closest SAS signal connector on the other backplane. The
longest cable connects to the farthest SAS signal connector on the other
backplane.
board and route the cables through the SAS cable guide; then, connect the
other end of the signal cables to the backplane assembly.