HP J2600A Installation Manual page 80

Cables and Connectors
This appendix lists cables that have been tested and verified for use with
this router module. It also includes minimum pin-out information, so
that if you wish to use an unlisted cable, you can verify that your cables
are correctly wired. Note that each pin-out does not necessarily match
the pin-out for the corresponding HP cable, but cables manufactured to
follow the minimum pin-out will function correctly. This appendix also
shows pin-outs for the loopback connector for the WAN port.
A-2