I am going to upgrade one of my field sites from 3 T1s to an OC3. My question is a rather large and general question. What type of software would I need to use, HDLC, PPP, Frame Relay, ATM, yada yada yada. I am currently using Frame Relay everywhere else and would like to stay with it. Also, what type of card would I need to purchase from cisco to put in the two 7206VXR routers I have here and there?