1、CCSDS Standard On-Board InterfaceS (SOIS),Rick Schnurr NASA Goddard Space Flight Center CCSDS SOIS Sub-Network working group chair2006 MAPLD International Conference Washington, D.C. September 25, 2006,CCSDS-SOIS Goal,To develop standards that will: Improve: Process of spacecraft development and int
2、egration Quality of the finished product Facilitate adoption of new technologies Hardware & software Support international onboard interface interoperability.,SOIS - Approach,To standardise interfaces between items of spacecraft equipment by: Specifying well-defined standard service interfaces and p
3、rotocols Allow standardized access to sensors, actuators and generic spacecraft functions Spacecraft applications to be developed independently of the mechanisms that provide these services. Applications are insulated from the specifics of a particular spacecraft implementation may be reused across
4、different spacecraft platforms with little regard of implementation details,SOIS - Architecture,SOIS Sub-Network Architecture,SOIS Sub-Network defines abstract service interface Abstract because it is not Bus/LAN specific. Mapping describes how services are implemented on a specific bus Maps Sub-Net
5、work services onto a Data-Link using Sub-Network Convertence functions or Data Link specific functions.,Sub-Network Architecture,Packet Transfer Service,Get/Set Parameter Service,Memory Read/Write Service,Time Distribution Service,Device Discovery Service,Test Service,Services: Sub Network,Bus Mappi
6、ng,Sub-Network Convergence functions,Standard Data Links,SOIS - Subnetwork,SOIS Sub-Network Architecture,SpaceWire already supports most mapping functions defined. In many cases more than one mapping function exits for each block Example, GAP vs RMAP Mapping from SOIS services is a priority of the C
7、CSDS-SOIS sub-network working group,SOIS support for CCSDS SOIS Mapping,Protocol Mux SpaceWire Standard Fragmentation Not needed Reliability GOES reliability protocol GET/SET and Memory Read GAP or RMAP PNP some work in progress could be deferred Address translation needed Priority needed Resource reservation - needed,Conclusion,CCSDS SOIS Sub-network services and required mapping functions are well defined at this point. Packet service and quality of service model are also mostly complete Mapping SpaceWire to CCSDS SOIS is a logical next step. Input from the SpaceWire community is desired.,
