A customer of mine has a Isotec 228 and a T-1 with 8 analog lines and Internet being delivered. The carrier has provided an adtran unit for delivery, conversion and seperation. We have went through 6 adtran units, something keeps burning out FXS lines on the adtran. The vendor did not have a replacement line card so he flipped 2 card positions and the trouble followed the bad card burning out the next 4 IAD600 FXS ports.
Any solution, this continues to happen.