So I just bought my very first 1A2 KSU, a 551c with the ringing generator included. It will come with 400D line cards which I know from reading the various threads most likely won't work for me because I need cards that will work on bridged/metallic ringing. Will 400H cards do the trick? I will most likely be putting this system behind my ACS, which is behind my comcast voice modem. Definitely not grounded ringing like a true telco line. This is my first foray into 1A2 so I will definitely have many more questions to come. Without this forum I wouldn't likely even attempt this. You guys are an amazing source of information and I can't thank you enough.
