It's very rare to see VDSL2 modems here in DR, Claro is the first ISP to use them, and only installs them for people getting one of the 2 most expensive tv packages, otherwise they install an adsl2+ modem, even if I get one I still need the PPPoE user/password, the only thing I know is that the username for that is "test", since the modem shows it, but nothing about the password of course... For adsl2-only modems the limit is set at their end and sync speed is set to 2336kbps (for a 2mbit plan), the same internet plan but including IPTV they install a Comtrend CT-5374 which has all the restrictions on the admin/admin login, the adsl2+ modems dont have any restrictions at all since they're capping the speed at their end.
I only have 1 TV box, but a friend has the same internet package and 3 tv boxes, they configured his VDSL2 service to sync at 12200kbps, so since he gets the same 2.5mbit, there's only like 9400kbps left for the 3 boxes, pretty sure in my case there's like 19-20mbit not being used at all.
For VDSL2 they offer 1-50mbit, for their FTTH 5-100mbit, they force you to pick a more expensive internet plan for those areas with FTTH, so if you want the 1, 2 or 3mbit plan, you cant get it... Seeing something like FTTH or even the service I got installed being capped this low is just sad...