said by djrobx 
:Funny - without CDV availability, Comcast's node and other cable equipment probably wouldn't be battery backed, and you'd be SOL in a power outage anyway!
-- Rob
I've had battery backups for a long time (just plain good idea for your computer equipment) and the node's had battery backups long before they started offering CDV anywhere. Power can be a tricky thing - you can have power and the neighbors across the street not. Imagine if your Comcast would have always gone out if anywhere between them and you SOMEBODY somewhere didn't have power.
