1. SciSys SOIS Prototyping Activities
CCSDS Spring 2008 Meeting, Washington D.C, USA

2. Overview SOIS Reference Implementation GenFAS for MARC ASSERT & DisCo
Complete SOIS architecture for evaluation & feedback
GenFAS for MARC
SOIS used as basis of Avionics
ASSERT & DisCo
SOIS used as basis of Distributed Computing Middlewares
Future Opportunities
Flights?
11th March 2008
SciSys SOIS Prototyping Activities - CCSDS Spring 2008

3. SOIS Reference Implementation
SciSys (UK) and Astrium SAS (FR)
Customer: ESA
Jan – Oct 2008
Objectives:
Prototype SOIS architecture over SpaceWire and MIL-STD-1553B
Investigate SOIS Plug-and-Play architecture on SpaceWire
Deploy on ESA’s RASTA Test Facility for future use
Provide feedback on SOIS Red Books
Provide draft Device Enumeration and Virtualisation Red Books
11th March 2008
SciSys SOIS Prototyping Activities - CCSDS Spring 2008

4. SOIS Reference Implementation
Application Support Services:
Asynchronous Messaging Service (subset)
Command and Data Acquisition Services
Device Virtualisation Service (first prototype)
Device Data Pooling Service
Device Access Service
Device Enumeration Service (first prototype)
File Services
File Access Service
File Management Service
(File Transfer Service not addressed)
Time Access Service
(Packet Store Service not addressed)
11th March 2008
SciSys SOIS Prototyping Activities - CCSDS Spring 2008

5. SOIS Reference Implementation
MIL-STD-1553B Subnetwork Services:
Derived from ECSS 1553 Extensions WG
Packet Service (Best Effort & Reserved QoS only)
Memory Access Service
Synchronisation Service (TIME primitives only)
Device Discovery Service
Test Service
SpaceWire Subnetwork Services:
Derived from ECSS SpaceWire WG
Packet Service (Best Effort & Assured QoS only)
Memory Access Service (RMAP)
Synchronisation Service (Simulation of SpaceWire TimeCodes, TIME primitives only)
(Test Service not addressed)
11th March 2008
SciSys SOIS Prototyping Activities - CCSDS Spring 2008

6. SOIS Reference Implementation
Reference Mission on ESA’s RASTA Test Facility
LEON2 CPU, RTEMS RTOS, ANSI C
11th March 2008
SciSys SOIS Prototyping Activities - CCSDS Spring 2008

7. MARC – Modular Architecture for Robust Computing
Astrium Ltd (System, UK), SciSys (Software, UK), SEA (Hardware, UK)
Customer: ESA
Oct 2007 – Mid 2009
Objective:
Develop scalable decentralised Avionics and Payload Control based on SpaceWire Network and SOIS
QoS
Real-Time Command distribution using Reserved QoS
Payload Data distribution using Best Effort/Assured QoS
CCSDS Packet distributed between software using AMS and Packet Service
AOCS Transducers accessed and controlled using CDAS and Packet/Memory Access Service
Onboard Time distributed and synchronised includes use of Synchronisation Service (SpaceWire TimeCodes insufficient to be soley used)
11th March 2008
SciSys SOIS Prototyping Activities - CCSDS Spring 2008

8. MARC – UNIONICS System Architecture
Copyright SEA Ltd.
11th March 2008
SciSys SOIS Prototyping Activities - CCSDS Spring 2008

9. MARC – GenFAS Software Architecture
11th March 2008
SciSys SOIS Prototyping Activities - CCSDS Spring 2008

10. MARC – Demonstrator Architecture
Copyright SEA Ltd.
11th March 2008
SciSys SOIS Prototyping Activities - CCSDS Spring 2008

11. ASSERT Many European companies and academic institutes
Customer: EC 50:50 funded under Framework 6
Sept 2004 – Oct 2007
Objective:
Automated proof based System and Software Engineering for Real-Time Applications
Distributed, Dependable, Hard Real-Time Virtual Machine
Middleware, RTOS, Communications
Developed by ENST, UPM, UPD, SciSys and others…
Platforms
Ada 2005, ANSI C, GNAT for LEON2, TSIM LEON2 Simulator, SpaceWire packet tunnelling over UDP/IP
SOIS Prototypes:
Message Transfer Service over SpaceWire Packet Service (Best Effort and Assured QoS)
11th March 2008
SciSys SOIS Prototyping Activities - CCSDS Spring 2008

12. DisCo - Overview
Astrium SAS (System & Dem SW, FR), SciSys (Middleware SW, UK), consultancy from University of York and LAAS
Customer: ESA
Jan 2005 – Jan 2008
Objective:
Develop Distributed Computing Middleware for Payload Control
Platforms:
SpaceWire
LEON2 (Pender Electronics), DSP (Dundee), PC
ANSI C and RTEMS, VDP and Linux RTOS
SOIS prototypes – shared with GenFAS for MARC
Message Transfer Service, Device Access Service, Device Data Pooling Service , File Services, Time Access Service
SpaceWire Packet (Best Effort and Assured QoS), Memory Access, and Time Distribution Services
11th March 2008
SciSys SOIS Prototyping Activities - CCSDS Spring 2008

13. DisCo – Software Architecture
11th March 2008
SciSys SOIS Prototyping Activities - CCSDS Spring 2008

14. DisCo – Demonstrator Architecture
Copyright Astrium SAS
11th March 2008
SciSys SOIS Prototyping Activities - CCSDS Spring 2008

15. Future Opportunities Follow-on to SOIS Reference Implementation
Implementation of any missing services
E.g. EVENT.indication of Synchronisation Service
Integration into wider communications scenario simulation, inc. Space Link
Port to CAN?
Fault tolerance?
AOB
ExoMars Rover
ESA Aurora Programme mission
Phase B2
SOIS baselined for Rover Avionics by EADS Astrium Ltd
11th March 2008
SciSys SOIS Prototyping Activities - CCSDS Spring 2008