contact devices 8 for electrically making contact with the signal lines 32 arranged in or on the substrate 3 the contact elements 7 of the first receptacle device 51 and of the last receptacle device 54 form a unit together with the contact devices 8 the signal lines of the stub bus system are thus integrated into the connector 1 in the form of the contact connections 10 the length of the stubs and thus the effect of reflections is reduced the length of signal paths between the switching assemblies 2 and thus the signal propagation time differences between the individual switching assemblies 2 are likewise reduced the probability of defective connections between the connector 1 and the substrate 3 is reduced by virtue of the reduced number of soldering points required between the substrate 3 and the receptacle devices 51 54 on the substrate 3 there remains significantly more space for electrical lines below the connector 1 thereby facilitating the configuration of lines on the substrate 3 in fig3 the bus control module 31 and the switching assemblies 2 are connected via a series bus system up down approach the contact connections 10 in each case connect only two contact elements 7 in each case one contact element 7 is assigned to an output set 72 of contact elements 7 of a receptacle device 51 52 53 54 and the other contact element 7 is assigned to an input set 71 of a succeeding receptacle device 52 53 54 55 the series bus system requires a termination module 21 in the respectively last equipped receptacle device 54 an inventive connector for a star bus system is illustrated in cross section in fig4 a and in plan view in fig4 b in.