After the game, NFL spokesman Michael Signora issued a statement on the behalf of the league, explaining that the equipment is handled by the league.
"In the first quarter of tonight's game, the Pittsburgh coaches experienced interference in their headsets caused by a stadium power infrastructure issue, which was exacerbated by the inclement weather," Signora said. "The coaches' communications equipment, including the headsets, is provided by the NFL for both clubs use on game day. Once the power issue was addressed, the equipment functioned properly with no additional issues."