{"vdl2":{"app":{"name":"dumpvdl2","ver":"2.6.0-5843a3a"},"t":{"sec":1781381304,"usec":623534},"freq":136975000,"burst_len_octets":53,"hdr_bits_fixed":0,"octets_corrected_by_fec":1,"idx":0,"sig_level":-5.768617,"noise_level":-14.481982,"freq_skew":-0.882770,"avlc":{"src":{"addr":"211658","type":"Ground station","status":"On ground"},"dst":{"addr":"39DE45","type":"Aircraft"},"cr":"Command","frame_type":"I","rseq":5,"sseq":4,"poll":false,"x25":{"err":false,"pkt_type":0,"pkt_type_name":"Data","chan_group":11,"chan_num":255,"sseq":1,"rseq":2,"more":false,"reasm_status":"skipped","clnp":{"err":false,"compressed":true,"local_ref_a":64,"priority":14,"lifetime":20.000000,"flags":246,"pdu_id":12639,"idrp":{"err":false,"pdu_type":4,"pdu_type_name":"Keepalive","seq":7,"ack":3,"credit_offered":4,"credit_avail":3}}}}}}
{"vdl2":{"app":{"name":"dumpvdl2","ver":"2.6.0-5843a3a"},"t":{"sec":1781381304,"usec":635661},"freq":136975000,"burst_len_octets":13,"hdr_bits_fixed":0,"octets_corrected_by_fec":0,"idx":0,"sig_level":-5.359084,"noise_level":-14.714314,"freq_skew":-0.401741,"avlc":{"src":{"addr":"39DE45","type":"Aircraft","status":"Airborne"},"dst":{"addr":"211658","type":"Ground station"},"cr":"Response","frame_type":"S","cmd":"Receive Ready","pf":false,"rseq":6}}}
{"vdl2":{"app":{"name":"dumpvdl2","ver":"2.6.0-5843a3a"},"t":{"sec":1781381311,"usec":505504},"freq":136975000,"burst_len_octets":34,"hdr_bits_fixed":0,"octets_corrected_by_fec":1,"idx":0,"sig_level":-5.025677,"noise_level":-16.239531,"freq_skew":-0.904507,"avlc":{"src":{"addr":"4D2535","type":"Aircraft","status":"Airborne"},"dst":{"addr":"283F57","type":"Ground station"},"cr":"Command","frame_type":"I","rseq":1,"sseq":2,"poll":false,"x25":{"err":false,"pkt_type":0,"pkt_type_name":"Data","chan_group":11,"chan_num":255,"sseq":5,"rseq":6,"more":false,"reasm_status":"skipped","clnp":{"err":false,"compressed":true,"local_ref_a":67,"priority":11,"lifetime":20.000000,"flags":246,"pdu_id":371,"cotp":{"pdu_list":[{"err":false,"tpdu_code":96,"tpdu_code_descr":"Data Ack","extended":false,"dst_ref":18131,"credit":3,"rseq":5,"variable_part_params":[{"name":"atn_checksum","value":[22,78,66,95]}]}]}}}}}}
{"vdl2":{"app":{"name":"dumpvdl2","ver":"2.6.0-5843a3a"},"t":{"sec":1781381313,"usec":799751},"freq":136975000,"burst_len_octets":14,"hdr_bits_fixed":0,"octets_corrected_by_fec":1,"idx":0,"sig_level":-5.609857,"noise_level":-16.308769,"freq_skew":-0.996167,"avlc":{"src":{"addr":"4A4D79","type":"Aircraft","status":"Airborne"},"dst":{"addr":"25D2F7","type":"Ground station"},"cr":"Response","frame_type":"S","cmd":"Receive Ready","pf":false,"rseq":4}}}
{"vdl2":{"app":{"name":"dumpvdl2","ver":"2.6.0-5843a3a"},"t":{"sec":1781381316,"usec":859512},"freq":136975000,"burst_len_octets":67,"hdr_bits_fixed":0,"octets_corrected_by_fec":0,"idx":0,"sig_level":-4.416542,"noise_level":-16.833265,"freq_skew":-0.964835,"avlc":{"src":{"addr":"1099EA","type":"Ground station","status":"On ground"},"dst":{"addr":"4D21F2","type":"Aircraft"},"cr":"Command","frame_type":"I","rseq":3,"sseq":3,"poll":false,"x25":{"err":false,"pkt_type":0,"pkt_type_name":"Data","chan_group":11,"chan_num":254,"sseq":1,"rseq":1,"more":false,"reasm_status":"skipped","clnp":{"err":false,"compressed":true,"local_ref_a":68,"priority":11,"lifetime":47.500000,"flags":192,"pdu_id":31417,"cotp":{"pdu_list":[{"err":false,"tpdu_code":240,"tpdu_code_descr":"Data","extended":false,"dst_ref":22,"sseq":7,"req_of_ack":0,"eot":1,"reasm_status":"skipped","variable_part_params":[{"name":"checksum","value":[108,105]}]}],"x227_apdu":{"acse_apdu":{"choice":"rlrq","data":{"release_request":{"reason":{"value":0,"value_descr":"normal"}}}},"cpdlc":{"atc_uplink_message":{"header":{"msg_id":7,"timestamp":{"date":{"year":2026,"month":6,"day":13},"time":{"hour":20,"min":8,"sec":36}},"logical_ack":"required"},"msg_data":{"msg_elements":[{"msg_element":{"choice_label":"CONTACT [unitname] [frequency]","choice":"uM117UnitNameFrequency","data":{"unit_name_frequency":{"unit_name":{"facility_designation":"EDWW","facility_name":"BREMEN","facility_function":"center"},"frequency":{"choice":"frequencyvhf","data":{"vhf":{"val":124.175000,"unit":"MHz"}}}}}}}]}}}}}}}}}}
{"vdl2":{"app":{"name":"dumpvdl2","ver":"2.6.0-5843a3a"},"t":{"sec":1781381317,"usec":620536},"freq":136975000,"burst_len_octets":32,"hdr_bits_fixed":0,"octets_corrected_by_fec":0,"idx":0,"sig_level":-4.529033,"noise_level":-16.888153,"freq_skew":-0.541168,"avlc":{"src":{"addr":"4D21F2","type":"Aircraft","status":"Airborne"},"dst":{"addr":"1099EA","type":"Ground station"},"cr":"Command","frame_type":"I","rseq":3,"sseq":4,"poll":false,"x25":{"err":false,"pkt_type":0,"pkt_type_name":"Data","chan_group":11,"chan_num":254,"sseq":1,"rseq":2,"more":false,"reasm_status":"skipped","clnp":{"err":false,"compressed":true,"local_ref_a":68,"priority":11,"lifetime":50.000000,"flags":192,"pdu_id":3281,"cotp":{"pdu_list":[{"err":false,"tpdu_code":96,"tpdu_code_descr":"Data Ack","extended":false,"dst_ref":24819,"credit":3,"rseq":8,"variable_part_params":[{"name":"checksum","value":[146,223]}]}]}}}}}}