This is a T1 over a leased circuit between to locations and my side is a Opt 81c and the other is an NEC 2400 pbx. In my end, it happens to be loop 78 and channels 2, 4,5,6,7,13,15,16 are LCKO and the rest are IDLE. They were IDLE and fine until I disabled them as part of a test the other end...