A storage cell configuration including magnetoresistive storage elements located in a cell field between first lines and second lines. In use the bench is removed for seating purposes and the doors of the armoire are opened. A compressed spring biases the reverse flow valve member to its closed position. The first fiber assembly is disposed at the first groove of the optical bench and comprises a first sleeve fixed at the first groove and a first optical fiber which is disposed in the first sleeve and aligned with the light-emitting surface. In the new method, the data transmission rate can be significantly increased due to the increased reliability in the data transmission by means of the integration of a test signal.