If the printer is attached to a network, then print a network setup page to verify the network connection. This page also provides important information that aids network printing configuration.
From the printer control panel, navigate to:
> Settings > Reports > 
> Network Setup Page >
Note: If an optional internal print server is installed, then Print Network [x] Setup Page appears.
Check the first section of the network setup page, and confirm that the status is Connected.
If the status is Not Connected, then the LAN drop may not be active, or the network cable may be malfunctioning. Consult your system support person for a solution, and then print another network setup page.