A system of wiring connections is used in which a combination of electro optical fibres and thin transducers are wrapped joint or other types of connection are available. The chassis layout associated with each row of printed cards consists of a lower part on which pairs suitable for electrical connection are provided, whilst the upper part can accommodate optical fibres and their transducers. This is done by having a slightly projecting accommodating a glass fibre (20) are situated. At the ends of these fibres, mounted in the projecting mounting blocks are transducers clamped firmly in place. These can be either transmitters or receivers. In either case, an electrical connection is also available, so that for example a receiver, an electrical connection, and a transmitter can all be accommodated in one block. Various possibilities arise from this of performing simple logic operations using these connections, and an AND gate and an OR gate are described.
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