The Federal Communications Commission appears poised to pass a controversial set of rules that broadly create two classes of Internet access, one for fixed-line providers and the other for the wireless Net.

The proposed rules of the online road would prevent fixed-line broadband providers like Comcast and Qwest from blocking access to sites and applications. The rules, however, would allow wireless companies more latitude in putting limits on access to services and applications.

Before a vote set for Tuesday, two Democratic commissioners said Monday that they would back the rules proposed by the F.C.C. chairman, Julius Genachowski, which try to satisfy both sides in the protracted debate over so-called network neutrality. But analysts said the debate would soon resume in the courts, as challenges to the rules are expected in the months to come.

Net neutrality, broadly speaking, is an effort to ensure equal access to Web sites and cutting-edge online services. Mr. Genachowski said these proposed rules aimed to both encourage Internet innovation and protect consumers from abuses.