That's not really valid anymore. VM have retired that router in many sites and haven't used it for broadband for a while. They don't use that architecture either. They've moved away from I-CMTS to M-CMTS and CCAP.
Loads of resources on CCAP throughout, though the issue I have is at my optical node.
VM Business Voom 3 I do not work for VM. I do work in IT, but haven't a clue about it. No, I will not fix your computer. I wouldn't know how to anyway.