The combined company would control 30 percent of the cable market and about a third of all broadband connections. Comcast has agreed to divest of 3 million cable subscribers as part of the deal to keep its market share at the 30 percent threshold, formerly a statutory limit imposed by the FCC. While no longer mandated, the divestiture is seen as a goodwill gesture by Comcast to help push the merger through, Moffett said.