I have looked into the NORTEL angle a bit, but time is not on my side. It does take a lot of time to research these things. A lot of the boards I have are still in the boxes they came in. But on the other hand a lot of the boxes are date for overnight delivery in 1993 through 1997. These units were still online until recently though. It is a hard call, especially since there is soooo very much that every moment I put off puts me farther behind. I would imagine that even telecom stuff reaches an end of life stage. I do know that the folks who replaced it could have cared less. They were just interested in installing their new equipment and told me so.