The mixer is contained in a 8 DIN module box. Powered by 230V mains, it has a dedicated output to power switching device art. 1224C. On input it receives a Simplebus 1 type signal and superimposes the monitor power supply for the riser. Up to 100 pieces of apparatus between entry phones and monitors can be connected, distributed over 4 outputs. Equipped with LEDs signalling any short-circuiting on the lines. Fitted with 4 terminals for line termination art. 1216. Dimensions: 140X140x67 mm (8 DIN modules).