How so when the router the Zhongxing 531b use?

ZTE is a 531b both cats adsl, wireless ap, a network router equipment.
But my 531b Telecom is the later version of the custom can not be upgraded directly to pppoe dial-up tool.

So I would like to ask, what kind of ZTE 531b (white, the latter version) adsl ahead of the cat as a function of the router (wireless router).ps.I can buy a adsl cat.

Please help write specific rules, I would like to thank!

it is a router! The increase is a function of a cat, you do not dial-up, he is a router, three three wireless cable.