The invention provides a method and system for connection set-up in a communication system which comprises a plurality of first processing units, e. The heating element is situated in a cavity formed by thermal insulating material in the assembly. In addition, the system includes a connector means providing a removable connection to the container. The sound path is defined by a first side surface with a concave curved surface and a second side surface with a convex curved surface that face each other with a space, and a third side surface and a fourth side surface that face each other with a space. When the blade is screwed by the bolt, a definite and solid positioning effect will be achieved if the flange contacts the expanded shoulder of the blade.