Edimax Technology IC-1520POE - Manual (Page 48)

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Some FTP servers require passive mode, if you don’t
know, please ask FTP server’s administrator; most of
FTP servers will work fine with both modes, but if you
found that non-passive mode is not working, you can try
to use passive mode.
Click ‘Apply’ to save settings and make the new settings take effect.
After that, you can click ‘Upload a test file’ to send a file to the FTP server you set
here, so you can make sure the setting you specified here is correct and working.