The Communication and Media controller is the main control unit of the Communication Systems which implements all the control logic for management of the passenger audio (PA) and information (PIS) connections , as well as reporting their status to the MDS. As a space-saving measure, it also embeds an audio amplifier. The Passeger Information system (PIS) displays data and pre-recorded advertising media to the passengers in the vehicle, as well as displaying video or warning messages sent from the OCC to the train. Public Address (PA) system performs the emergency and security warning announcements broadcasting as main target. The PA system also offers functions such as announcements, automatic announcements, and is also able to broadcast the announcements from the Operation Control Center (OCC). SEPSAMEDHA's PIS controllers, are available in a Compact or Modular format. Both have the same technical features. The PIS controller also manages automatic voice and visual announcements, which can be programmed based on different variables such as time or train position.