AT&T Inc. (T), joining the ranks of U.S. TV, Internet and wireless providers racing to consolidate, is in advanced talks to acquire DirecTV for about $50 billion, according to people familiar with the matter. Under the plan being discussed, management of DirecTV, the largest U.S. satellite-TV provider, will continue to run the company as a unit of AT&T, said the people, asking not to be named because the information is private. DirecTV Chief Executive Officer Mike White plans to retire after 2015, the people said.