The mixer is housed in a 8 module DIN enclosure. Powered by 120V mains supply, with dedicated output for powering switching device art. 1224A. Receives a Simplebus 1 type input signal and superimposes the monitor power supply for the riser. Up to 100 devices (door-entry phones and monitors) can be connected, distributed over 4 outputs. Equipped with a LED to signal any short-circuits detected on the lines. Equipped with 4 line termination terminals art. 1216. Dimensions: 140x140x67 mm (8 DIN modules). Allows management of alarm signals and intercom communication between users without requiring an interface or porter switchboard. It can be used for the call addressing of 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 without interface is present and active and when the alarm function is being managed on the system.