Need help setup new gateway..... - DirecTV

Trying to replace my old 2wire gateway with a new model (pace 5268AC). My old model only required an Ethernet cord, cable cord, and the power cord. The new model is saying I need a broadband connection. Can I connect the new with the cords I already have? I have a cable and internet plan with AT&T, no land-line for phone.I can't connect , would anyone know how to solve my problem? Please and thank you.

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