I have REV D.
This makes me wonder now. I signed up for 10Mbps service ( during the summer ) and no mention of needing a new modem. The tech stopped by and checked the outside box and called in saying to drop the speed to 5Mbps. I think I have 6Mbps by checking my modem stats ( 6368 kBits down 896 kBits up ).
The DSL bill still says I have 10Mbps.
Thanks for your help tstolze