said by majortom1029:
Cablevision didnt need docsis 3 to roll out 30/5 package when they first came out with that package. For 30/5 speeds only docsis 2 was needed.
Sure DOCSIS 2 could support it with a limited number of customers like when it "first came out", but it's much more efficient and scalable to a larger number of customers with DOCSIS 3.--
If it's important, back it up... twice. Even 99.999% availability isn't enough sometimes.