I am told that this is used for d channels to terminate on but it seems that my pri cards are taking up 2 channels each despite that card having a d channel or not. I am currently using an old pbx g3siv6 and I am using the tn765 cards that allows for 8 physical processors to be used. I am maxed since each pri takes 2 processors for some reason. What card do I need to get more physical processors? if it is another tn765 where would that card go - in slot. I put it in a purple slot and it shorted the whole pbx so of course I am very hesitant now. Does anyone know what card I need or if that pbx can only handle 1 card and a max of 8 processor interface? Thanks for all the help guys.