The Z21 signal decoder is a universally applicable DCC decoder for complex bright signals. Z21 Signal Decoder The Z21 signal decoder is a universally applicable DCC decoder for complex bright signals. ? Widely configurable ? Compatible with Railcom The Z21 Signal Decoder is a Universally Applicable DCC DCCer for Complex Light Signals. Z21 Signal Decoder The Z21 Signal Decoder is a Universally Applicable DCC DCCer for Complex Light Signals. ? Updatable ? Extensively Configuble ? Compatible with Railcom Der Signal-DeCoder Z21 ist ein Universitell Edinsetzbarer DCC-Decoder Für Komplexe Lichtsignale. Z21-Signal-DeCoder Der Signal-DeCoder Z21 ist ein Universitell Edinsetzbarer DCC-Decoder Für Komplexe Lichtsignale. ? Aktualisierbar ? Umfangreich konfigurierbar ? Kompatibel Mit.