AT&T signs over $3 billion fiber deal with Corning as data demand surges

AT&T NYSE:T on Tuesday said it had signed a multi-year deal worth more than $3 billion with Corning NYSE:GLW to procure fiber and cable, as the telecom giant expands its network to meet surging demand for data.Corning shares rose 3.3% in premarket trading.Fiber network build-out has emerged as a cr…