Since I´ve lost a few hours discovering how to configure my Trendnet TE100-P1U in CUPS, I think it´s good idea to post this how-to, in order to collaborate.
First, make sure cups service is up and running.
Then, open your browser and type "localhost:631", to open the CUPS administration page.
Click in "Add printer" and follow the instructions.
The trick part is to get the printer address right.
Choose for device "AppSocket/HP JetDirect" and as address:
(PS: printerIP should be your printer address, as in 192.168.102)
Then select the apropriate driver for your model (do not try to use generic drivers that´s not for your specifc printer)
Now it should work!