If you are refering to Quintum A800, you log into the unit using the RS232 input. Enter the I.P. address of the unit. Once you have an I.P. address on it,plus the mask and the default gateway, conect it to a P.C.using a hub or a reverse ethernet cable.
Using a normal standar browser, open up http:// plus the I.P. address.
You will get into the gui that way.
Warning: The GUI is almost useless. Not enough for a mediocre setup. Some thing could be done only on CLI,either trough telnet or via RS232.