T1 signalling: Um...I gotta double check that. We had the LEC change it and at this moment, I cannot remember...though B8ZS sounds about right.

Dip switches on T1 card. Yup, all switches on the face of the card are set for DID. The other jumpers are set for normal operation (versus loopback). No fault light appears on the card. Only the busy light engages when the channel is busy. I did have the main fault light on earlier when using a spare NRCU. Once it was replaced, the fault light went out.

NDTU is in T00 slot and slots T01, T02, T03, T04 and T05 are not occupied with any circuit boards.

I do have the manual with the T1 section. Is there a particular page you are referring to? Hmmm...let me double check all the settings as compared to the book.