It has three PRI's A,B,C,D trunk groups and you can put the DTI cards in two places on MICS1 and 2 "off core" places, specifically slot 1 in a 12X0 connected Via fiber MOD 03-08. It Nulls out the slot 2 and 3 for each of the 12X0 trunk mods configured this way. I think you can have 3 active at...