asterix 023 "CNS/ATM Ground Station and Service Status Reports" edition 1.3 date 2021-09-27 preamble Surveillance data exchange. items 000 "Report Type" definition This Data Item allows for a more convenient handling of the reports at the receiver side by further defining the type of transaction. element 8 table 1: Ground station status report 2: Service status report 3: Service statistics report remark NOTES: 1. In applications where transactions of various types are exchanged, the Report Type Data Item facilitates the proper report handling at the receiver side. 2. All Report Type values are reserved for common standard use. 010 "Data Source Identifier" definition Identification of the Ground Station from which the data is received. group SAC "System Area Code" element 8 raw SIC "System Identification Code" element 8 raw remark Note: - The up-to-date list of SACs is published on the EUROCONTROL Web Site (http://www.eurocontrol.int/asterix). 015 "Service Type and Identification" definition Identifies the type of service being reported. group SID "Service Identification" element 4 raw STYP "Type of Service" element 4 table 1: ADS-B VDL4 2: ADS-B Ext Squitter 3: ADS-B UAT 4: TIS-B VDL4 5: TIS-B Ext Squitter 6: TIS-B UAT 7: FIS-B VDL4 8: GRAS VDL4 9: MLT remark Note: - The service identification is allocated by the system. - The service identification is also available in item I021/015. 070 "Time of Day" definition Absolute time stamping expressed as UTC time. element 24 unsigned quantity 1/2^7 "s" remark Notes: 1. The time of day value is reset to zero each day at midnight. 100 "Ground Station Status" definition Information concerning the status of a Ground Station. extended NOGO "Operational Release Status of the Data" element 1 table 0: Data is released for operational use 1: Data must not be used operationally ODP "Data Processor Overload Indicator" element 1 table 0: Default, no overload 1: Overload in DP OXT "Ground Interface Data Communications Overload" element 1 table 0: Default, no overload 1: Overload in transmission subsystem MSC "Monitoring System Connected Status" element 1 table 0: Monitoring system not connected or unknown 1: Monitoring system connected TSV "Time Source Validity" element 1 table 0: Valid 1: Invalid SPO "Indication of Spoofing Attack" element 1 table 0: No spoofing detected 1: Potential spoofing attack RN "Renumbering Indication for Track ID" element 1 table 0: Default 1: Track numbering has restarted - GSSP "Ground Station Status Reporting Period" element 7 unsigned quantity 1 "s" >= 1 <= 127 - remark Notes: 1. A time source is considered as valid when either externally synchronised or running on a local oscillator within the required accuracy of UTC. 2. Bit 8 (NOGO), when set to “1” indicates that the data transmitted by the GS is not released for operational use. 3. Bit 2 indicates that the allocation of Track-IDs (Item I021/161) was re-started. 101 "Service Configuration" definition Information concerning the configuration of a Service. extended RP "Report Period for Category 021 Reports" element 8 unsigned quantity 1/2 "s" SC "Service Class" element 3 table 0: No information 1: NRA class 2: Reserved for future use 3: Reserved for future use 4: Reserved for future use 5: Reserved for future use 6: Reserved for future use 7: Reserved for future use spare 4 - SSRP "Service Status Reporting Period" element 7 unsigned quantity 1 "s" >= 1 <= 127 - 110 "Service Status" definition Information concerning the status of the Service provided by a Ground Station. extended spare 4 STAT "Status of the Service" element 3 table 0: Unknown 1: Failed 2: Disabled 3: Degraded 4: Normal 5: Initialisation - 120 "Service Statistics" definition Statistics concerning the service. Provides counts of various ADS-B message types that have been received since the report was last sent. repetitive 8 group TYPE "Type of Report Counter" element 8 table 0: Number of unknown messages received 1: Number of too old messages received 2: Number of failed message conversions 3: Total Number of messages received 4: Total Number of messages transmitted 20: Number of TIS-B management messages received 21: Number of Basic messages received 22: Number of High Dynamic messages received 23: Number of Full Position messages received 24: Number of Basic Ground messages received 25: Number of TCP messages received 26: Number of UTC time messages received 27: Number of Data messages received 28: Number of High Resolution messages received 29: Number of Aircraft Target Airborne messages received 30: Number of Aircraft Target Ground messages received 31: Number of Ground Vehicle Target messages received 32: Number of 2 slots TCP messages received REF "Reference from which the Messages Are Countered" element 1 table 0: From midnight 1: From the last report spare 7 CV "32-bit Counter Value" element 32 raw 200 "Operational Range" definition Currently active operational range of the Ground Station. element 8 unsigned quantity 1 "NM" remark Notes: 1. Maximum value indicates “maximum value or above”. RE "Reserved Expansion Field" definition Expansion explicit re SP "Special Purpose Field" definition Special Purpose Field explicit sp uap 010 000 015 070 100 101 200 110 120 - - - RE SP