asterix specification

Asterix category 065 - SDPS Service Status Reports

category: 065

edition: 1.5

date: 2020-06-18

Preamble

Surveillance data exchange.

Description of standard data items

I065/000 - Message Type

definition: This Data Item allows for a more convenient handling of the messages at the receiver side by further defining the type of transaction.

Element

bit size: 8

Values:

1:
SDPS Status
2:
End of Batch
3:
Service Status Report
Notes:
  • In application where transactions of various types are exchanged, the Message Type Data Item facilitates the proper message handling at the receiver side.

I065/010 - Data Source Identifier

definition: Identification of the system sending the data.

Group

I065/010/SAC - System Area Code

Element

bit size: 8

Raw Content

I065/010/SIC - System Identification Code

Element

bit size: 8

Raw Content

Note:

I065/015 - Service Identification

definition: Identification of the service provided to one or more users.

Element

bit size: 8

Raw Content

Note:
  • The service identification is allocated by the SDPS.

I065/020 - Batch Number

definition: A number indicating the completion of a service for that batch of track data, from 0 to N-1, N being the number of batches used to make one complete processing cycle.

Element

bit size: 8

Unsigned integer

I065/030 - Time of Message

definition: Absolute time stamping of the message, in the form of elapsed time since last midnight, expressed as UTC.

Element

bit size: 24

Unsigned quantity

LSB = 1/27 s ≈ 7.8125e − 3 s

unit: "s"

Note:
  • The time is reset to zero at every midnight.

I065/040 - SDPS Configuration and Status

definition: Status of an SDPS.

Group

I065/040/NOGO

Element

bit size: 2

Values:

0:
Operational
1:
Degraded
2:
Not currently connected
3:
Unknown

I065/040/OVL

Element

bit size: 1

Values:

0:
Default
1:
Overload

I065/040/TSV

Element

bit size: 1

Values:

0:
Default
1:
Invalid Time Source

I065/040/PSS - Processing System Status

Element

bit size: 2

Values:

0:
Not applicable
1:
SDPS-1 selected
2:
SDPS-2 selected
3:
SDPS-3 selected

I065/040/STTN - Track Re-numbering Indication

Element

bit size: 1

Raw Content

The STTN bit indicates when track numbering has been restarted. The STTN bit is a toggle bit that changes its value whenever the SDPS system starts re-numbering its tracks. Re-numbering of the track takes place either after SDPS start-up (cold or hot start-up) or when a configuration set has been changed (please note that the latter case is ARTAS specific behaviour and may be different in another SDPS).

Spare bits: 1

I065/050 - Service Status Report

definition: Report sent by the SDPS related to a service

Element

bit size: 8

Values:

1:
Service degradation
2:
Service degradation ended
3:
Main radar out of service
4:
Service interrupted by the operator
5:
Service interrupted due to contingency
6:
Ready for service restart after contingency
7:
Service ended by the operator
8:
Failure of user main radar
9:
Service restarted by the operator
10:
Main radar becoming operational
11:
Main radar becoming degraded
12:
Service continuity interrupted due to disconnection with adjacent unit
13:
Service continuity restarted
14:
Service synchronised on backup radar
15:
Service synchronised on main radar
16:
Main and backup radar, if any, failed

I065/RE - Reserved Expansion Field

definition: Expansion

Explicit (ReservedExpansion)

I065/SP - Special Purpose Field

definition: Special Purpose Field

Explicit (SpecialPurpose)

User Application Profile