Primary D-Channel on span 1 down

Hi,
i’m having two HFC card configured to work in TE mode with bristuff, i.e. zaphfc, but, when I start asterisk I’m getting the same message all the time:

Primary D-Channel on span 1 down
Primary D-Channel on span 2 down

and I can’t receive calls or make a call. I’m trying everything…
If someone have an idea please let me know :wink: