2-input video modulator for anal cameras, conceived to get even better integration between Duo System videointercom and videosurveillance. It allows to send on Duo bus the video signal generated by anal cameras standard resolution. It can be connected serial to Duo bus, without the need of further accessories or video distributors. It is powered directly by the bus, the input cameras can be managed in independent way by any other element of the system therefore as normal videosurveillance cameras, or they can be associated to one or more external stations to manage (completely flexible)pictures sent on the bus at the time of a call. For this last function, please check the compatibility with the external stations.