Have a customer with an iDCS500, 2 PSUs. The analog ports in the odd slots are not getting ring generation. Analog ports in the even slots are working fine. Have tried replacing the PSUs and swapping the PSUs around. Issue remains on the original cards.

I've looked through the documentation I have on both R1 and R2, no where is there any mention of a Ring Generator. Does anyone know if there is such a thing and know where I could source one?