IBM System p Series Cabling Manual page 33

After you finish
__ Did you receive a cable hook with your rack shipment?
v No. Proceed to the next item.
v Yes. The cable hook can help manage the server cables in the back of the rack. To install the cable hook, slide
it into the slots located on the back of the rack as shown in the following figure:
__ Return to your initial server setup checklist and complete the next step.
See the back views of the model to see the connectors.
Cabling your model 9405-520 with a console
For a graphical representation of the slots and connectors that are referred to in this topic, see the back
views of the model.
Cabling a model 9405-520 or 9406-520 and a twinaxial console
Learn how to connect the twinaxial cable, power cords, external cables, and the optional electronic
customer support cable, cable the expansion units, attach devices, install the PCI Cryptographic
Coprocessor card, route the cables, and start the server.
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Cabling your server