Have the same problem but with ethernet connection and D-LINK 604T. Shows as connected to AOL broadband as 2mb/s but is only actually 1mb/s downstream, although 256 mb/s is going upstream?
Unlikely to be USB as even version 1 works at 11mb/s, v2- 480mb/s
Will get hold of AOL.....will let you know any results...don't hold your breath