HP ProLiant SL6000/SL6500 Scalable System Cabling Guide

Network cabling 20
The servers in the bottom half of the rack have a redundant adapter cabling configuration.
Network cabling with InfiniBand switches
By mounting InfiniBand switches with connectors at the rear of the rack, you can eliminate in-rack routing and
bending of the InfiniBand cables from the external network. This configuration also keeps the InfiniBand
connections isolated at the back of the rack, reducing physical interference with SFP transceivers.