Fios guide says football on 504, 507, 576, 578, but no mention of who's playing. Guessing it's 507 since there's a pregame, but I'm dvr'ing the game so need to know for sure.
I assumed you're in the DC viewing area from those channel numbers.
All preseason games are on Comcast SportsNet (576) in full HD, with SD feeds being sent to local channels (504).
Ravens are on 578 and 507.
Yep, DC, thanks!