A system comprising first and second fire-resistant parts for at least temporary fire-resistant sealing of an opening in a wall in which at least one transport device, such as a cable, conduit or tube, has been fed through or will be fed through. A primary facility is provided that directly or indirectly receives requests from a requestor to store an actual data value. The channel includes a first wall and a second wall. A phase connection circuit coupled to the first processor and the second processor determines whether the first phase is equivalent to the second phase.