The invention relates to a telecommunications network configured for providing access to a plurality of terminals is proposed and a method therefore. The method involves replacing the left and right termini of the adenovirus with the corresponding termini from an adenovirus which grow efficiently in the desired cell line. The ingress system includes a first free queue and a first flow queue. A further advantage is that the dental ceramic blocks are securely held apart from one another on the dental mount and therefore cannot damage one another when they are moved or transported. The plug guard has hollow protrusions corresponding to the protruding plates of the electrical plug, grooves corresponding to the hollow protrusions and holes corresponding to the shafts.