Ccsds standard on board interfaces sois
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CCSDS Standard On-Board InterfaceS (SOIS). Rick Schnurr NASA – Goddard Space Flight Center CCSDS – SOIS Sub-Network working group chair 2006 MAPLD International Conference Washington, D.C. September 25, 2006. CCSDS-SOIS Goal. To develop standards that will: Improve:

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CCSDS Standard On-Board InterfaceS (SOIS)

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Ccsds standard on board interfaces sois

CCSDS Standard On-Board InterfaceS (SOIS)

Rick Schnurr

NASA – Goddard Space Flight Center

CCSDS – SOIS Sub-Network working group chair

2006 MAPLD International Conference

Washington, D.C.

September 25, 2006


Ccsds sois goal

CCSDS-SOIS Goal

  • To develop standards that will:

    • Improve:

      • Process of spacecraft development and integration

      • Quality of the finished product

    • Facilitate adoption of new technologies

      • Hardware & software

      • Support international onboard interface interoperability.


Sois approach

SOIS - Approach

  • To standardise interfaces between items of spacecraft equipment by:

    • Specifying well-defined standard service interfaces and protocols

      • 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 different spacecraft platforms with little regard of implementation details


Sois architecture

SOIS - Architecture


Sois sub network 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-Network services onto a Data-Link using Sub-Network Convertence functions or Data Link specific functions.


Sub network architecture

PDU encapsulation

Others – USB, IEEE-802.11, One Wire

Ethernet

CAN

IEEE-1394

MIL-STD-1553

SpaceWire

Link Redundancy

Retry

Priority

Address Translation

PNP Support

Resource Reservation

Protocol Multiplex

Fragmentation

Sub-Network Architecture

SOIS - Subnetwork

Services: Sub Network

Time Distribution Service

Packet Transfer Service

Get/Set Parameter Service

Memory Read/Write Service

Device Discovery Service

Test Service

Bus Mapping

Sub-Network Convergence functions

Standard Data Links


Sois sub network architecture1

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 CCSDS-SOIS sub-network working group


Sois support for ccsds sois mapping

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

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.


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