'The mixer is contained in a 8 DIN module box. Powered by 120 V mains, it has a dedicated output for switching device power supply art. 1224A. On input it receives a Simplebus 1 type signal and superimposes the monitor power supply for the riser. Up to 100 pieces of apparatus including door-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). Allows alarm signalling management, as well as the intercom facility between users without the aid of an interface or porter switchboard. It allows call addressing for up to 120000 users. The mixer is not compatible with the TOP system when several main and secondary switchboards are used in the same system, when the intercom function is present and active without an interface and when the alarm function is being managed on the system.