CSAB counselling will start after the completion of JoSAA counselling. There are various channels in CSAB and these channels will open separately in online mode. Till now any specific dates have not been announced by the authority. The official dates are yet to come. Check out this link here http://engineering.careers360.com/articles/csab and keep visiting the official website for furthur updates. As mentioned in the official website, the authority can release the counselling schedule very soon.