Had same problem. Got it to work!!
I have DLink DP-311U and 2Wire Gateway router/modem 2701HG-B.
Solution: Connect DP-311U to router via network cable.
Then you can see it either with PS Admin or with browser http://192.168.0.10
should be default IP address of DLink Print Server. Set Connection Mode=Infrastructure, ESS-ID=2WIRExxx (xxx is your number of the router) - this is your network name, and wireless channel=1.
And the most important - change your IP Address to 192.168.1.xxx - xxx=choose a number over 64 if it's not taken already.
On your Gateway page: http://gateway.2wire.net/xslt?PAGE=J46&THISPAGE=A02_POST&NEXTPAGE=J46
Set Network Name=2WIRExxx, WIreless Channel=1, enable SSID Broadcast, Disable wireless network Security.
Once you get those numbers in, check connectivity with above programs with cable connected, or typing new print server IP address in browser. Then disable cable and check again. You should be able to see the box. Then connect print server to printer and make sure your printer settings on computer point to new IP address.