said by GLIMMER:
how the hell do you figlure that?
most docsis1.1 builds will do 4-6 up and 20-30 down. Here in former insight land we are docsis 2.0 and it will do up to 10 up I have seen the speed tests before comcrap took over the area
Comcast isn't going to provision 22mbps for a single user into a 38mbps channel. By policy, they'll only give you the 22mbps tier if they can use a D3 modem to balance your traffic across at least 3x38mbps downstream channels. So yes, while it is indeed possible for a D1.1/2.0 modem to do 20-30mbps downstream, it is highly unwise to provision it that way given the current subscriber loading of the downstream channels.
You'll find this out when you try to order the Ultra service once it becomes available.