Asterix is utility used to read and parse EUROCONTROL ASTERIX protocol data from stdin, file or network multicast stream and print it to standard output in text, XML or JSON format. Source can be used to generate Wireshark dissector for ASTERIX protocol. All ASTERIX categories are defined through XML definition file.
Used "eurocontrol-cat011-pt8-ed1-3.pdf" as reference.
Line 418, under Data Item 245, "transponde" => "transponder".