Download Important advice for installation / configuration of your GATEWAY 500 with Dual Fiber Optic Terminals for Audi with MOST Optical fiber System 1. Installation of GATEWAY 500 unit Dual FOT For All Audi vehicles: A good location to mount the GATEWAY 500 unit is at the CD Changer behind the glove box. If the vehicle is equipped with the in-dash CD Changer, install the GATEWAY 500 unit behind it. Interfacing in the MOST optical ring should be done as shown in the installation guide. For All Audi vehicles NOT equipped with a factory CD Changer, the GATEWAY 500 interface shall be integrated into the optical MOST ring at the output of the head unit. For All Audi vehicles equipped with a factory CD Changer, the GATEWAY 500 interface shall be installed at the factory CD Changer location. 2. Configuration of the DIP switches on the GATEWAY 500 interface When the unit is shipped, the DIP switch setting is not configured on your GATEWAY 500, depending on the car radio / navigation system you MUST choose the right DIP switch setting.