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The NDRM-20 is a rack mount 20 call access/camera and communication control systemfrom Aiphone which is specially designed to communicate between a remote intercomstation and a central master console. The NDRM-20 control system comes with anexpandable system of up to 100 intercoms, an electronic tone/LED call master function, 4station expansion modules, as well as open voice simplex communication, and a 500mWcommunication output. The NDRM-20 control system also features a modular phone jack,inbuilt relays for a door release, and comes capable of controlling external devices such asCCTV camera when an associated substation is selected, or a maglock or door strike canbe selectively controlled. This advanced control system is easy to install, and offers highquality performance and reliable operation within many applications.