We recently moved two T1's from Ciena 3500 Sonet to Ciena 3932 TDM over Packet for transport between two CS1000 PBXs. Moving these T1's has caused frame slip errors DTA017 at a rate of 3-5 per hour. We think it has something to do with the clocking on the 3932 switch interrupting or corrupting the timing from the PBXs . Does anyone have an experience with the Ciena 3932 transporting T1s?