[Salva135]

From the Globe's Mike Reiss:

"Belichick said the Patriots operated without their coach-to-quarterback communication system for most of Sunday's game. He said it was unusual for that to happen and that the team went to a system in which they were signaling plays into Tom Brady."

This was brought up as an issue for the Redskins during their game last week in Foxborough, and I know it was talked about a bit when Spygate first opened and people were scrambling to find other examples of possibly dirty practices by the Pats.

Edit: It appears that it was the crowd noise being so loud that they had to abandon use of the communications equipment. The original report was poorly written and vaguely implied the system was inoperable from a technical standpoint. This was pointed out in the Colts-Noise thread.