Only the single front-mounted USB 3.0 port of the TBT3-UDV dock supports BC 1.2 charging. 

For example, a mobile phone that supports BC 1.2 charging will charge when connected to the front USB 3.0 port of the dock, even if the dock is not connected to a laptop. 

The remaining four USB 3.0 ports on the back of the dock will only provide standard USB power to USB devices (up to 900mA) when the dock is connected to a host laptop. They do not provide any special charging capabilities, and they will not provide power if the dock is not connected to a host laptop.