I have (2) Cisco DTAs on my Comcast Account. THANK GOD they have nothing to do with my TiVo. I have CableCard in my TiVo. After two years with DTA - they are nothing but a nightmare. I'm still working with Comcast Tech Support to get them to work reliably. They keep loosing the Encryption Keys. I have replaced units. Tech Support has been here multiple times and found nothing wrong. Maybe they will work better in your area. I am working with firstname.lastname@example.org now to try and get things fixed.