Thanks in advanced. I just want to make sure I am doing this right. I am going to be swapping out Tn754B 4 wire digital boards with TN2224CP 2 wire digital boards. I moved all the stations off of the boards. All the ports say P, I think I need to set these to U? Is there anything else I need to do other than busyout the boards, take them out, and put the new ones in. Will the switch reconize that it is the new digital boards?