Video multiplexer Features: The video multiplexer bundles the video signals of door stations, DCS-camera gateways, and DCS-IP gateways. A video multiplexer can merge the video signals from three door stations with colour cameras. Using two video multiplexers, the video signals from up to 5 door stations can be merged. The combination housing makes three mounting types possible: Surface-mounted (in a standard junction box). Flush-mounted (in a device box). As a DRA device (with the included DRA adapter). Notes : No further configuration is necessary during start-up because the video multiplexer automatically adapts to the existing mains supply.