said by tragik74:SB6141 doesn't support turbo plan.
Modem has nothing to do with turbo....
Also - I purchased a 6141 and had the same issues with 30/5 service - I was getting 5/1 with the modem. TW insisted they provisioned it correctly so I swapped it with a replacement from Amazon.
The new modem worked fine 30/5. Not sure if the old one was bad or TW just screwed up the provisioning