I just setup a DTI link between an OP11C and an 81C, both running rlse 25.40. I'm using a 1.5mb DTI/PRI card in the 11C and a DDP in the 81C. I have a fiber link for the T1 span between the 2 systems. On both systems, the DTI loop will come up on a loopback but won't come up when talking one another. Worst then that, as soon as I remove the bidirectionnal loopback on the FO modem, the OP11C does an OS restart! Any idea anyone?