Hi! It's me again. I'm doing a great deal of work for this client that has the ITT 1A2 Key system. There are a few issues that, over time, I will post if I can't sort them out myself.

This problem I stumbled upon. The tip/ring polarity is correct from the demarc to the KSU. Leaving the KSU it's also correct. On the first 66 block it's reversed, but the color codes are correct. I thought that there might be something in between the KSU and the block, but I haven't found it yet, It's the only thing that could be the answer to me. Any ideas?

Thanks

Dave