Edimax Technology PS-1210Un - Manual (Page 109)

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8.4.2 Wireless
If you want to use the print server through wireless LAN,
please set up the print server through Ethernet first and
make sure your wireless LAN setting is correct. After
setting the wireless LAN, unplug the Ethernet cable and
restart the print server, then you can start to use the print
server through wireless LAN. If the wireless configuration
does not work, please plug the Ethernet cable again,
restart the print server and configure the print server
through Ethernet until the wireless LAN settings are
correct.
8.4.2.1 General Setting