The Event Logger monitors and logs Digital Program Insertion (DPI) messages to verify correct transmission of signals via satellite. It watches for configured GPI state changes that indicate an expected DPI message. If the message is received on time, it is logged as a matched event. If not received on time, it is flagged as missed. The Event Logger also decodes DPI messages to help diagnose issues, and is compatible with various encoding systems. It has 6 ASI inputs, 108 GPI sensors, and logs data in real-time and for archiving.