HP LaserJet 9040mfp Guide De Mise En Route page 23

Connecting to Ethernet 10/100Base-TX network
Use the RJ-45 connector to connect the product to an Ethernet 10/100Base-TX network.
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1 Make sure that the product power cord is not connected to an outlet.
2 Pull the output device away from the product.
3 Connect a network cable to the RJ-45 connector.
4 Connect the other end of the cable to the network port.
5 Reattach the output device to the product.
Connect product cables 21