The apparatus includes first, second and third connectors, a control signal generator (5.11) and first and second switches (5.9, 5.10). The first and second connectors each have a signal input terminal, a signal output terminal and a control signal terminal. The third connector has a signal input terminal (5.7) and eventually a control signal terminal (5.8). The first and second switching means each have first (a), second (b) and third (c) terminals, the first terminal (a) of the first switches (5.9) being coupled to the signal output terminal (5.5) of the second connector, the second terminal (b) of the first switches (5.9) being coupled to the signal input terminal (5.1) of the first connector, the first terminal (a) of the second switching means (5.10) being coupled to the signal output terminal (5.2) of the first connector, the second terminal (b) of the second switching means (5.10) being coupled to the signal input terminal (5.4) of the second connector. The first and second switches (5.9, 5.10) are adapted to couple the second (b) or the third (c) terminal to the first terminal (a) under the influence of a first or second control signal respectively, supplied by the control signal generator (5.11). The control signal generator (5.11) has a first terminal (10) coupled to the control signal terminals (5.3, 5.6) of the first and second connectors, and an output terminal (12, 13) for supplying the first and second control signal for the first and second switches (5.9, 5.10) respectively. The signal input terminal (5.7) of the third connector is coupled to the third terminals (c) of the first and second switches (5.9, 5.10). The control signal generator (5.11) is further adapted to generate a control signal for at least one of the first and the second switches, in response to the control signal applied to a second terminal (11).Further an input-output circuit is provided for coupling a controller included in the control signal generator (5.11) to line 10 of the SCART cable.