MAGIC AD1 ETI decoder monitors ETI output signal of an ensemble multiplexer. System allows simultaneous monitoring of all DAB and DAB+ audio data streams. System can be connected anywhere in 2-Mbit/s signal (NA, G.704 and NI, G. 703) to be monitored or it can be connected in parallel with signal path. All audio programmes in data stream are monitored and an individual programme can be extracted and decoded. Audio signal can be output as an analogue or digital (AES/EBU) signal. Additionally, headphones output is available. An external alarm indication is possible via two relay outputs and six TTL outputs. MAGIC AD1 ETI has also an integrated protocol storage which gives additional information about errors that have occurred in ETI data stream.