The HP LaserJet 4000 printer can be connected to your office network if you have a network card installed in the EIO slot at the rear of the printer. You can configure the printer’s network settings using the JetAdmin software, or directly at the printer control panel. Use the printer keypad to scroll through the printer menus and enter the network settings manually if you know the IP address and other settings. Writer Bio

How to Configure Jetdirect EIO for an HP LaserJet 4000 - 85