Internet service providers want to end the all-you-can-eat plans and get their customers paying à la carte.

But they are having a hard time closing the buffet line.

Faced with rising consumer protest and calls from members of Congress for new regulations, Time Warner Cable backed down last week from a plan to impose new fees on heavy users of its Road Runner Internet service.

The debate over the price of Internet use is far from over. Critics say cable and phone companies are already charging far more than Internet providers in other countries. Some also wonder whether the new price plans are meant to prevent online video sites from cutting into the lucrative revenue from cable TV service.

Cable executives say the issue is not competition but cost. People who watch or download a lot of movies and TV shows use hundreds of times more Internet capacity than those who simply read e-mail and browse the Web. It is only fair, they argue, that heavy users should pay more.