D-Link DP-301U Manual page 28

Port Settings
In this field, you can assign the Port Name for the print server, and the description
for the Printer port. It also allows you to select the PJL Printer setting (Yes or No).
NOTE: PJL (Printer Job Language) has certain job requirements that must
be met to work correctly. For more information, please refer to your printer's
manual.
Once you have changed the settings in each option, click Apply Settings to store
the settings, or Cancel to abandon.
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