HP Jetdirect 250M User Manual page 30

Note: If your network wiring is hidden --
In many network installations, the network
components (hubs, switches, &c) are stored in a
wiring closet and the network wiring is hidden
in the walls. The only sign of a network that you
see in such an installation is a wall outlet that
has one or two network connectors. In this case,
make your network connection by connecting a
network cable between the print server and the
wall outlet. (If you have any questions about
such an installation, check with your network
administrator.)
Note that the illustration shows only the data
connections (network cables and printer cable);
we have omitted power cords from the
illustration to keep the drawings simple.