1. SISG - SSI ADD Service, Physical, and Protocol View Document Figures Ver 0.4, 2 Sept 09 Peter Shames, et al

2. SSI I I User Applications User Applications Solar System Internet Service Provider (SS-ISP) User access points Network 1 I II Network 2 II Network n II I. Participating Network Peering Points

3. SSI I I User Applications User Applications Network layer Service Access Points BP, IP delay-aware apps Link BP delay- unaware apps LTP UDP IP Physical BP, IP

4. User nodes Terrestrial WANs Earth-Space Link Terminals Spaceborne Relays Planet-Space Link Terminals Planetary WANs SSI and user assets on the Earth SSI and user assets in space User nodes SSI and user assets on some planetary surface

5. SSI Service Infrastructure Service Provision Mission User Service Delivery Interfaces SD I/F SM I/F Service Management Interface Service Production Positioning & Timing Services Radiometric Services Return Data Delivery Services Forward Data Delivery Services CCSDS Cross Support Service Management CCSDS Cross Support Transfer Services & SSI SD I/F SM I/F Earth User Node Space Comm Elements Earth / Planet Space Link Terminal Space Link

6. Mission User SSI Service Execution Service Execution Resources Service Users Scheduling and Control Functions Network scheduling SM I/F SM I/F Mission scheduling Mission planning Equipment configuration, control, monitoring Config Profile DB Service Agreement DB Config Profile DB Service Agreement DB Service Delivery Interfaces Mission Planning, Scheduling and Execution Functions Request SSI service for mission XYZ using standard configuration abc 1.Forward SSI service 2. Return SSI service 3. Emergency end node delivery service FDF 1 2 3 Request Example: Service Delivery Example: Service Management Interface Mission Planning Manager Mission User Station S67 Space Missions

7. Mission User SSI Service Execution Service Execution Resources Service Users Scheduling and Control Functions Network scheduling SM I/F SM I/F Mission scheduling Mission planning Equipment configuration, control, monitoring Config Profile DB Service Agreement DB Config Profile DB Service Agreement DB Service Delivery Interfaces Mission Planning, Scheduling and Execution Functions Request TT&C service using mission XYZ standard configuration abc via Portal 1. Raw Radiometric service 2. Forward CLTU telecommand service 3. Return All Frames telemetry service FDF 1 2 3 Request Example: Service Delivery Example: Service Management Interface Mission Planning Manager Mission User Station S67 Space Missions

8. Service Delivery Interfaces CCSDS Space Link & SSI Services SSI Service Infrastructure Service Provision SD I/F SM I/F Service Production Positioning & Timing Services Radiometric Services Return Data Delivery Services Forward Data Delivery Services Earth / Planet Space Link Terminal Mission User SD I/F Space User Node SD I/F

9. SSI Service Infrastructure Service Provision SD I/F SM I/F Service Production Positioning & Timing Services Radiometric Services Return Data Delivery Services Forward Data Delivery Services SD I/F Service Delivery Interfaces CCSDS Space Link & SSI Services, Peering Service Management in-band Earth / Planet Space Link Terminal SSI Service Infrastructure Service Provision SD I/F SM I/F Service Production Positioning & Timing Services Radiometric Services Return Data Delivery Services Forward Data Delivery Services SD I/F Space Comm Relay / Link Element

10. User nodes Terrestrial WANs Earth-Space Link Terminals Spaceborne Relays Planet-Space Link Terminals Planetary WANs Network-network interface controlled by Peering Agreement User access interface controlled by User-Provider SLA User nodes User Applications User Applications User Applications User Applications End-to-End user application communications using SSI services

11. Earth / Planet Space Link Terminal Space User Access WAN Access Space Link Layer Processin g Network Layer Processing Service Management Network Control Data Store Space Asset Access Xmit / Recv Gnd Link Layer Processing Earth / Planet Space Link Terminals

12. Spaceborne Relays Spaceborne Relay Planet- Space Terminal Access Earth- Space Terminal Access Xmit / Recv Network Layer Processing Service Management Network Control Data Store Space Link Layer Processin g Space Link Layer Processin g Xmit / Recv Space User Access

13. Spaceborne Relays Spaceborne Relay Planet- Space Terminal Access Earth- Space Terminal Access Xmit / Recv Network Layer Processing Service Management Network Control Data Store Space Link Layer Processin g Space Link Layer Processin g Xmit / Recv Space User Access Emergenc y Comm Processin g

14. Terrestrial/ Planetary WANs Terrestrial / Planetary WAN Access Network Layer Processing Data Store Earth - Space Link Terminal Access Ground User Access Service Management Network Control Gnd Link Layer Processin g Gnd Link Layer Processin g

15. User nodes Generic User Node Space Link Access Space Asset Access WAN Access Xmit / Recv Network Layer Processing Space Link Appl Svcs Application Layer Svcs Data Store User Applications Space Link Layer Processin g Gnd Link Layer Processing

16. User nodes Space User Node Space Link Access Space Asset Access Xmit / Recv Network Layer Processing Space Link Appl Svcs Data Store User Applications Space Link Layer Processin g Application Layer Svcs

17. User nodes Surface User Node WAN Access Network Layer Processing Application Layer Svcs Data Store User Applications Gnd Link Layer Processing

18. User nodes Space User Node Space Link Access Space Asset Access Xmit / Recv Space Link Appl Svcs Data Store User Applications Space Link Layer Processin g Application Layer Svcs

19. Hybrid nodes Hybrid Science / Relay Node Xmit / Recv Network Layer Processing Space Link Appl Svcs Application Layer Svcs Data Store User Applications Space Link Layer Processing Planet- Space Terminal Access Earth- Space Terminal Access Space Link Layer Processin g Xmit / Recv Space User Access Network Control

20. Physical Space Packet Link Network CLTU / AOS Frame Application File Internetworking Packet (DTN / IP) Transport FORWARD Raw Radiometric Bit-stream Delta-DOR Validated Radiometric Position Time Position & Time Service Users Radiometric Radiometric & Tracking Physical / Bitstream Frame App Data & Files Internetwork Voice / Video FilePktV/VInetAOSBitRad

21. Files Lander - Orbiter CCSDS Protocols DTN CFDP BP TM, TC, AOS Cod. RF & Mod Encap LTP BP Orbiter - Ground CCSDS Protocols DTN TM/TC/ AOS Encap TM, TC, AOS Cod. RF & Mod Encap BP Terrestrial WAN TCP/IP BP CFDP Files DTN Scenario n.6 (Basic) – ABBA All DTN CFDP, DTN, Encapsulation Packet and TM/TC/AOS Frame services DTN over TCP/IP Terrestrial NetworksSpacelink CFDP, DTN, Space/Encapsulation Packet and Prox-1 Frame services Spacelink Packet SAP Prox-1 Packet SAP Prox-1 Space Packets Encap Prox-1 DTN TCP/I P LTPTCP/I P Space Packets LTP v 1.3 - 28 July 2009 21 Spaceborne Relay Earth-Space Link Terminal Ground User Node Space User Node Encap

22. v 1.3 - 28 July 2009 22 Scenario n.6 (Basic) – ABBA All DTN Description –This scenario depicts the transfer of files and packets to a single Agency A Lander using the support of a Ground Complex (including the orbiter GDS) and an Orbiter provided by Agency B. –Both Agency A and B implement DTN. End to end services –Bidirectional transfer of files between the Lander and its control centre (CFDP over DTN) –Bidirectional transfer of packets (SPP or Encap) between the Lander and its control centre (SPP/Encap over DTN) Ground cross support services –Bidirectional transfer of DTN bundles between Lander Control Centre and Ground Complex (DTN over Encap) Space-Ground CCSDS services –Bidirectional DTN over LTP reliable link –Bidirectional Encapsulation Packet transfer –Bidirectional TM/TC/AOS frame transfer Space-Space CCSDS services –Bidirectional DTN –Bidirectional Prox-1 Packet transfer (Packet SAP of Prox-1) Agency specific functions –Agency B Orbiter must handle DTN routing and store & forward services

23. Files Lander - Orbiter CCSDS Protocols DTN CFDP BP TM, TC, AOS Cod. RF & Mod Encap.SPP Direct TM/TC Proxy Encap SPPEncap LTP BP CFDP Orbiter - Ground CCSDS Protocols DTN TM/TC/ AOS Encap TM, TC, AOS Cod. RF & Mod Encap BP Terrestrial WAN TCP/IP BP CFDP Files DTN Scenario n.6 (Extended) – ABBA All DTN CFDP, DTN, Encapsulation Packet and TM/TC/AOS Frame services DTN over TCP/IP Terrestrial NetworksSpacelink CFDP, DTN, Space/Encapsulation Packet and Prox-1 Frame services Spacelink Packet SAP UDD SAP Prox-1 UDD SAP Packet SAP Prox-1 Direct TM/TC Space Packets Encap/ SPP Prox-1 DTN TCP/I P LTPTCP/I P Space Packets Direct TM/TC LTP v 1.2 - 24 July 2009 23 Spaceborne Relay Earth-Space Link Terminal Ground User Node Space User Node

24. v 1.3 – 3 Sept 2009 24 Scenario n.6 (Extended) – ABBA All DTN Description –This scenario depicts the transfer of files, packets and Direct TM/TC to a single Agency A Lander using the support of a Ground Complex (including the orbiter GDS) and an Orbiter provided by Agency B. –This is the same as Scenario 6 (Basic), but with extended functions for specialized and emergency communications handling –Both Agency A and B implement DTN. End to end services –Bidirectional transfer of files between the Lander and its control centre (CFDP over DTN) –Bidirectional transfer of packets (SPP or Encap) between the Lander and its control centre (SPP/Encap over DTN) –Bidirectional transfer of (packetized and non packetized) Direct TM/TC between the Lander and its control centre (as files with Orbiter Proxy processing) –Emergency mode delivery of SPP, TC, or other low level commands via orbiter proxy processing Ground cross support services –Bidirectional transfer of DTN bundles between Lander Control Centre and Ground Complex (DTN over Encap) Space-Ground CCSDS services –Bidirectional DTN over LTP reliable link –Bidirectional Encapsulation Packet transfer –Bidirectional TM/TC/AOS frame transfer Space-Space CCSDS services –Bidirectional DTN –Bidirectional Prox-1 data transfer (TC/TM frames, SPP, or other low level commands over UDD SAP) –Bidirectional Space/Encapsulation Packet transfer (Packet SAP of Prox-1) Agency specific functions –Agency B Orbiter must handle DTN routing and store & forward services the packing/unpacking of files (to convert between the Lander Direct TM/TC services and CFDP) the interpretation/addition of metadata / file delivery instructions, and proxy processing, reception and transmission of data types (direct TM/TC, files, Encapsulation packets)

25. Files Planet - Orbiter CCSDS Protocols DTN CFDP BP TM, TC, AOS Cod. RF & Mod Encap LTP BP Orbiter - Ground CCSDS Protocols DTN TM/TC/ AOS Encap TM, TC, AOS Cod. RF & Mod Encap BP Terrestrial WAN TCP/IP BP CFDP Files DTN Scenario n.6 (Planetary WAN) – ABBWA All DTN DTN over TCP/IP Terrestrial Networks Spacelink CFDP, DTN, Encapsulation and Prox-1 Frame services Spacelink Packet SAP Prox-1 Space Packets Encap DTN TCP/I P LTPTCP/I P Space Packets LTP v 1.3 - 28 July 2009 25 Encap BP DTN TCP/I P Packet SAP Prox-1 TCP/IP DTN TCP/I P Planetary WAN CFDP, DTN, Encapsulation Packet and TM/TC/AOS Frame services DTN over TCP/IP Terrestrial Networks Planet-Space Link Terminal Spaceborne Relay Earth-Space Link Terminal Ground User Node Space User Node

26. Current Forward TC Scenario – ABCBA Cross Support v 1.3 - 27 July 2009 26 Lander - Orbiter CCSDS Protocols Orbiter - Ground CCSDS Protocols Terrestrial WAN Direct TM/TC SPP Proxy File Processing Bitstream Transfer Files UDD SAP Priv TC RF & Mof Priv SLE CLTU File Radiation TC Code. RF Mod SLE CLTU Forward CFDP, Space Packet and TM/TC/AOS Frame services FTP File Transfer Files Direct TM/TC Files Non-DTN Files Non-DTN Space Packets Terrestrial Networks Spacelink CFDP, Space Packet and Prox-1 Frame services Spacelink UDD SAP Prox- 1 Non-DTN Phys Prox-1 SLE CLTU Forward FTP File Space Packets Direct TM/TC Files Non-DTN FTP File Forward FTP File FTP File Forward PrivateFil e Protocol Terrestrial WAN Lander Orbiter Lander MOC Orbiter MOC Terrestrial Networks Space Link Terminal Mission File Integration UDD / SPP Process Local Files Orbiter Local File Processing SPP Cod TC Spaceborne Relay Earth-Space Link Terminal Ground User Node Space User Node Spaceborne Relay MOC

27. Current Forward TC Scenario – ABCBA Description –This scenario depicts the current forward transfer of files (possibly containing packets or direct TC frames) to a single Agency A Lander using the support of a Ground Complex C and an Orbiter and Orbiter GDS provided by Agency B. –Neither Agency A, Agency B, nor the Ground Complex C implements DTN. End to end services (n.b. Forward only, return is different) –Mono-directional transfer of packets (within a file) between the Lander control centre and its Lander (protocols & process differs from agency to agency) –Mono-directional return of data from Lander to its control center (return direction protocols are different from forward, and differ from agency to agency) –Transfers require specialized manipulation of data by the Orbiter GDS and by the Orbiter –Process is almost entirely manual, including planning, file upload assembly, and any retransmission processing which must be explicitly commanded Ground cross support services (n.b. Forward only, return is different) –Mono-directional transfer of files between Lander Control Centre and Orbiter Control Centre (using FTP) –Mono-directional transfer of files between Orbiter Control Centre and Earth-Space Link Terminal, after integration of Lander file into Orbiter file upload (using SLE CLTU) –Mono-directional Space Packet transfer (within file, via orbiter, with special handling) –Private Orbiter Control Center to Orbiter file transfer protocol (mission and agency unique) Ground-Space CCSDS services (n.b. Forward only, return is different) –Mono-directional TC frame transfer using SLE-CLTU Space-Space CCSDS services (n.b. Forward only, return is different) –Mono-directional Prox-1 bitstream transfer (UDD SAP of Prox-1) –Mono-directional Space Packet transfer (after aligning data and extracting Packets from UDD SAP bitstream delivered by Prox-1) Agency specific functions (n.b. Forward only, return is different) –Agency B Ground Control Center must handle the packing/unpacking of files (to convert between the ground file transfer from Agency A and its file upload formats, and Handling of files according to its private uplink file transfer protocol, and the creation of the filename to provide metadata / file delivery instructions. –Agency B Orbiter must handle private “file forwarding” and data staging services the packing/unpacking of files (to convert between the Orbiter private file transfer protocol and Orbiter file store), and Interpretation of filename as metadata / file delivery instructions, and proxy processing and transmission of data types (direct TM/TC, files, Encapsulation packets) delivery of the file contents as a bitstream across the Proximity-1 UDD SAP. v 1.3 – 3 Sept 2009 27

28. Lander - Orbiter CCSDS Protocols Orbiter - Ground CCSDS Protocols Terrestrial WAN Direct TM/TC CFDP SPP File, SPP, Direct TM/TC Proxy UDD SAP Packet SAP CFDP SPP CFDP SPP TM, TC, AOS Cod. RF & Mod CFDP SPP File, SPP, Direct TM/TC proxy TM, TC, AOS Cod. RF & Mod CSTS File Forward/ Return CFDP, Space Packet and TM/TC/AOS Frame services CSTS Ground File Transfer Services Files Space Packets Direct TM/TC Non-DTN Space Packets Terrestrial NetworksSpacelink CFDP, Space Packet and Prox-1 Frame services Spacelink Scenario n.5 – ABBA All Non-DTN UDD SAP Packet SAP CFDP SPP Prox-1 Non-DTN CFDP SPP TM/TC, AOS Prox-1 Files v 1.2 - 24 July 2009 28 CSTS File Forward/ Return CSTS File Files Local Files Spaceborne Relay Earth-Space Link Terminal & MOC Ground User Node Space User Node

29. Scenario n.5 – ABBA All Non DTN Description –This scenario depicts the transfer of files, packets and Direct TM/TC to a single Agency A Lander using the support of a Ground Complex (including the orbiter GDS) and an Orbiter provided by Agency B. –Neither Agency A nor Agency B implements DTN. End to end services –Bidirectional transfer of files between the Lander and its control centre (CFDP with private file forwarding and staging functions) –Bidirectional transfer of packets (within a file) between the Lander and its control centre –Bidirectional transfer of (packetized and non packetized) Direct TM/TC/AOS frames between the Lander and its control centre (as files with Orbiter Proxy processing) Ground cross support services –Bidirectional “CSTS” transfer of files between Lander Control Centre and Ground Complex Space-Ground CCSDS services –Bidirectional CFDP (with private file forwarding and staging functions) –Bidirectional Space Packet transfer –Bidirectional TM/TC/AOS frame transfer Space-Space CCSDS services –Bidirectional CFDP (with private file forwarding and staging functions) –Bidirectional Space Packet transfer (using Packet SAP of Prox-1) –Bidirectional Prox-1 frame transfer (using UDD SAP of Prox-1) Agency specific functions –Agency B Ground Complex must handle the packing/unpacking of files (to convert between the ground file transfer services and CFDP) and the interpretation/addition of metadata / file delivery instructions. –Agency B Orbiter must handle private “file forwarding” and data staging services the packing/unpacking of files (to convert between the Lander Direct TM/TC services and CFDP) the interpretation/addition of metadata / file delivery instructions, and proxy processing, reception and transmission of data types (direct TM/TC, files, Encapsulation packets) v 1.2 - 24 July 2009 29

30. Lander - Orbiter CCSDS Protocols Orbiter - Ground CCSDS Protocols Terrestrial WAN File, SPP, Direct TM/TC Proxy CFDP SPP CFDP TM, TC, AOS Cod. RF & Mod Encap LTP BP DTN TM/TC/ AOS Encap CFDP TM, TC, AOS Cod. RF & Mod CFDP Encap LTP BP Non-DTNDTN Non-DTN Scenario n.7 – ABBA Non-DTN Agency supported by DTN Agency File, SPP, Direct TM/TC proxy Packet SAP UDD SAP Prox-1 Direct TM/TC CFDP SPP UDD SAP Space Packets Packet SAP Prox-1 Files CFDP, DTN, Encapsusaltion Packet and TM/TC/AOS Frame services CSTS Ground File Transfer Services Terrestrial NetworksSpacelink CFDP, Space Packet and Prox-1 Frame services Spacelink Prox-1 SPP CFDP v 1.2 - 24 July 2009 30 CSTS File Forward/ Return CSTS File Forward/ Return Files Space Packets Direct TM/TC CSTS File Files Local Files Spaceborne Relay Earth-Space Link Terminal Ground User Node Space User Node

31. Scenario n.7 – ABBA Non-DTN Agency supported by DTN Agency Description –This scenario depicts the transfer of files, packets and Direct TM/TC to a single Agency A Lander using the support of a Ground Complex (including the orbiter GDS) and an Orbiter provided by Agency B. –Agency A does not implement DTN while Agency B implements DTN. End to end services –Bidirectional transfer of files between the Lander and its control centre (CSTS and CFDP) –Bidirectional transfer of packets (within a file) between the Lander and its control centre –Bidirectional transfer of (packetized and non packetized) Direct TM/TC/AOS frames between the Lander and its control centre (as files with Orbiter Proxy processing) Ground cross support services –Bidirectional “CSTS” transfer of files between Lander Control Centre and Ground Complex Space-Ground CCSDS services –Bidirectional TM/TC/AOS frame transfer –Bidirectional Encapsulation Packet transfer –Bidirectional DTN (for DTN enabled agency) –Bidirectional CFDP Space-Space CCSDS services –Bidirectional CFDP (with DTN staging and forwarding) –Bidirectional Space Packet transfer (Packet SAP of Prox-1) –Bidirectional Prox-1 frame transfer (UDD SAP of Prox-1) Agency specific functions –Agency B Ground Complex must handle the packing/unpacking of files (to convert between the ground file transfer services and CFDP) and the interpretation/addition of metadata / file delivery instructions. –Agency B Orbiter must handle DTN routing and store & forward services the packing/unpacking of files (to convert between the Lander Direct TM/TC services and CFDP) the interpretation/addition of metadata / file delivery instructions, and proxy processing, reception and transmission of data types (direct TM/TC, files, Encapsulation packets) v 1.2 - 24 July 2009 31

32. Files DTN CFDP BP Orbiter - Ground CCSDS Protocols Terrestrial WAN BP CFDP Files Terrestrial NetworksSpacelink UDD SAP Packet SAP Prox-1 Direct TM/TC Space Packets Encap/ SPP Prox-1 Space Packets Direct TM/TC v 1.2 - 24 July 2009 32 Spaceborne Relay Earth-Space Link Terminal Ground User Node Space User Node DTNNon-DTN DTN Scenario n.8 – ABBA DTN Agency supported by Non-DTN Agency CFDP, Space Packet and TM/TC/AOS Frame services CSTS Ground File Transfer Services Space/Encapsulation Packet and Prox-1 Frame services File, Encap, SPP, Direct TM/TC Proxy Packet SAP CFDP SPP TM, TC, AOS Cod. RF & Mod CFDP SPP File Proxy TM, TC, AOS Cod. RF & Mod CSTS File Forward/ Return UDD SAP CFDP SPP TM/TC, AOS Prox-1 CSTS File Forward/ Return CSTS File Files Local Files Lander - Orbiter CCSDS Protocols Encap SPP Encap.SPP DTN Files

33. v 1.1 - 22 June 2009 33 Scenario n.8 – ABBA DTN Agency supported by Non-DTN Agency Description –This scenario depicts the transfer of files, packets and Direct TM/TC to a single Agency A Lander using the support of a Ground Complex and an Orbiter provided by Agency B. –Agency A implements DTN while Agency B does not implement DTN End to end services –Bidirectional transfer of files between the Lander and its control centre, using CFDP over DTN –Bidirectional transfer of packets between the Lander and its control centre (Orbiter Proxy, only to support Direct TM/TC) –Bidirectional transfer of Direct TM/TC between the Lander and its control centre (Orbiter proxy via UDD) –Bidirectional transfer of the DTN bundle protocol between the Lander and its control centre (Orbiter proxy via SPP) Ground cross support services –Bidirectional “CSTS” transfer of files between Lander Control Centre and Ground Complex Space-Ground CCSDS services –Bidirectional TM/TC/AOS frame transfer –Bidirectional Space Packet transfer –Bidirectional CFDP Space-Space CCSDS services –Bidirectional Prox-1 frame transfer (UDD SAP) –Bidirectional CCSDS [Space/Encapsulation] Packet transfer (Packet SAP of Prox-1) Agency specific functions –Agency B Ground Complex must handle the packing/unpacking of files (to convert between the ground file transfer services and CFDP) and the interpretation/addition of suitable metadata. –Agency B Orbiter must handle private “file forwarding” and data staging services the packing/unpacking of files (to convert between the Lander Direct TM/TC services and CFDP) the interpretation/addition of metadata / file delivery instructions, and proxy processing, reception and transmission of data types (direct TM/TC, files, Encapsulation packets)

34. BACKUP

35. v 1.1 - 22 June 2009 35 Lander - Orbiter CCSDS Protocols Prox-1 SPP/Enc. TM, TC, AOS Cod. RF & Mod EncapSPP Orbiter - Ground CCSDS Protocols CFDP TM/TC/AOS SPP CFDP SPP TM, TC, AOS Cod. RF & Mod CFDP SPP CSTS File Forward/ Return Terrestrial Networks CSTS File Forward/ Return DTNNon-DTN DTN Scenario n.8 – ABBA DTN Agency supported by Non-DTN Agency CFDP, Space Packet and TM/TC/AOS Frame services CSTS Ground File Transfer Services Terrestrial NetworksSpacelink Space/Encapsulation Packet and Prox-1 Frame services Spacelink Packet SAP UDD SAP Prox-1 File Proxy Files File, Encap, SPP, Direct TM/TC Proxy BP Files Space Packets Direct TM/TC Encap.SPP UDD SAP Packet SAP Prox-1 Direct TM/TC Space Packets CFDP BP Files CFDP Encap

36. User Node Terrestrial WAN Earth- Space Link Terminal Space -borne Relay Planetary WAN User Node Earth- Space Link Terminal User Node Space -borne Relay User Node

37. SCaN Service Execution Service Provision Mission User Mission User Service Delivery Interfaces SD I/F SD I/F SM I/F Service Management Interface Radiometric Services Return Data Delivery Services SM I/F Service Production Positioning & Timing Services Forward Data Delivery Services Network service execution systems Service Client / Software InterfaceSpecifications SoftwareDefinedRadio Space Missions

38. Architecture What are its elements? Ops. Concept How is it operated? SSISSI I I User Applications User Applications