IBM System p Series Cabling Manual page 86

Connecting the external cables
__ If you are using any optional adapters (such as token ring or 8-port EIA-232), connect the cables to the
appropriate adapter connectors in the PCI slots of your machine.
See Adapters, Devices, and Cable Information for Multiple Bus Systems
pseries/en_US/infocenter/base/hardware_docs/pdf/380516.pdf) for a description of cables and adapters that
might be installed on your workstation.
Note: If the cable did not come with your workstation, you will have to supply it.
Attaching devices using the system ports
__ If you have an IBM System p5 or eServer p5 server, the system ports on the back of the server are disabled
when your server is connected to an HMC.
Note: The attachment of high availability cluster multiprocessing IBM (HACMP) cables to the service processor
communications ports on the back of the server is not supported.
Connecting the power cords
__ Power cords should be routed through the retention rings or under the retention brackets that are provided to
prevent the power cords from becoming unplugged unexpectedly.
__ If your workstation is equipped with a retention ring, route the power cord through the ring before you
plug it into the back of the workstation. See the following figure as an example:
80
System i and System p: Cabling your server
(http://publib16.boulder.ibm.com/