HI! There, i am baffled with this , iam upgrading a Mics 6.1KSU, it also has 6 port fiber slot with 2 0x12's with DS cards, i tried putting in 2 global CI cards with dip setting in right position. i found out i had a bad CI card could only get 4 trunks to work ,so i try to put back in 1 DS trunk card for the other 4 trunks and it wouldn't come back the 4 lines on DS card stayed flashing, swap the DS and Caller id card slots and the caller id lines work and the Ds lines flash , swap out Ds card with another same thing , i had to put both DS trunk cards back in the Ksu slot 3 and 4. my question is do both cards in the Ksu have to be the same 2 DS or 2 CI cards ??? I checked the programing for the cards and lines all was good.. :bang: Okay someone make loook stupid Please. :scratch: