I have a customer with a Triad 1 that I cannot get the CID to work. It works fine in my office but not at their site. Single line CID devices work, a Comdial DX-80 works but no serial output on the 9 port CID box in this location. I'm properly grounded, no AC ripple and no detectable RF. I'm at a loss. I've tried 3 different units that work OK in my office but no output at their location.

Anybody have an old 1480-00 they wish to let go reasonably or any good ideas as to what might be going on?

Thanks, Bill.