Abstract: A mobile radio facility for installation in a motor vehicle which already includes a junction cable extending from a location in the trunk to a location in the passenger compartment, terminating at each end in a plug connector. The facility includes a radio unit which can be installed in the trunk and plug connected to the vehicular cable, and one or more peripheral units in the passenger compartment such as a micro-telephone, control panel and/or portable telephone. Each peripheral unit has at least a pair of identical plug-in terminals providing identical connections thereto. The facility also includes a plurality of additional junction cables, one of which is plug-connected at one end to the vehicular cable and at the other end to a plug-in terminal of one of the peripheral units. Each of the remaining cables is plug-connected at each end to a plug-in terminal of different peripheral units so as to establish a sequential order of interconnection of all such units to the vehicular cable.