ONE Concept

ONE Work area & lab setup

ONE Goals

• Provide single network interface regardless of physical link

• Provide reliable, isochronous message transport

Closed IONetClosed IONet

OpenInternet

Precipitation Processing System

Data

Workstation

Mission OperationsCenter

Data

Workstation

Data

MDP/CFDP

WSGTGN Router

WSGTGN Router

STGTGN Router

STGTGN Router

GuamGN Router

GuamGN Router

C&DH

IOO

PR-U MassStorageMass

Storage

GPM Spacecraft

GNC

95 kbps 95 kbps

PSE

1553

Ethernet

15 kbps

GMI

MDP/CFDPUDPCOP-1 like

One minute science data files

~ One minute insts HK files

~One minute

...

Instrument A

Instrument B

Instrument C

Instrument A

Instrument B

Instrument C

...

Instrument A

Instrument B

Instrument C

Instrument A

Instrument B

Instrument C

......

Instrument A

Instrument B

Instrument A

Instrument B

Instrument C

Instrument A

Instrument B

Instrument A

Instrument B

Instrument C

...

Instrument A

Instrument B

Instrument A

Instrument B

Instrument C

Instrument A

Instrument B

Instrument A

Instrument B

Instrument C

...

GPM Mission Data Flow Concept

1553GNC Components

25 kbps

PR-A

S/C HK files

BC

RT RT RT

BC

RT

RT

FileManager

FileXfer

Instr.Support

TlmOutput

NIC NIC

NIC

COMM

CmdIngest

SoftwareBus

NB

NIC

Prototype Goals

•Verify IP protocol use in real-time, flight environment• Maintain IP standard protocols• Use standard IP/Ethernet stacks – no modifications

• Implementation • minimize modifications to common executive services• maintain COP-1-like functionality• no isochrony

Prototype Effort Stack

PhysicalLayer

Data LinkLayer

NetworkLayer

Transport Layer

Application Layer

SOIFServicesApplications

UserApplications

Intra ProcessorCommunication

CommunicationServices

Transport API Messaging API File Transfer API Data Link API

SOIF NetworkManagement

Ethernet

Device Driver

IP Stack

UDP

Network Bus

Comm User Apps

Flight Software Architecture

PSE

Inter-task Message Router (SW Bus)

MemoryChecksum

EDACMemoryScrubber

Tlm &StatisticsMonitor

1 HzTime Synch

MDP/CFDP

ACSHK Data

AcquisitionManager

PSESupport

Health &Safety

Manager

SoftwareManager

TimeCode

StoredCommandProcessor

TelemetryOutput

FileManager

TransponderCmd (UDP COP-1)

Thruster InstrumentsACS

Components

AutonomousNavigation

SpacecraftAnalogs

PowerSupply

Electronics

Switch Commands & Readbacks

Commands

Common Executive

C&DH

CommandIngest

MemoryDwell

Real-time Telemetry (UDP)

Fire Cmd

ThrusterStatus Data

COMM(UL/DL I/F)

Sensor Data,Time

GNC

Actuator Cmd

InstrumentsSupport

Science,Housekeeping

Date

MassStorage

1553 BusSupport

Science & HK files (MDP/CFDP)

HGA

HGA CmdPosition

Network Support

NB

SpaceWireSupport

GSFC Protoype Effort - Commanding

• characteristics of commanding that need to be addressed for a complete IP/command implementation: acknowledgment, sequencing, and reliability

• Implement many of the COP-1 features including sequence verification, retransmit, bypass,

and lock-out • COP-1 functions are performed at the user application layer in the Command Ingest Task • CLCW will be used for verification and is downlinked by CI in a UDP packet, on a

separate UDP port • On the uplink side, the secondary header of the CCSDS command includes a sequence counter,

the unlock bit, and the bypass bit

GSFC Protoype Effort – Special Commanding

•There are 2 types of special commands:

• COM special command:• is distributed via hardwire•.defined by a specific, pre-determined UDP destination port• action of the COM special command is defined in the UDP data• The UDP data will either be formatted as a byte(s) or a CCSDS packet (TBD), but must be at a fixed offset from the IP header.

• Bus special command:• broadcast over the network• defined by the host id of the IP address equaling a value of 25• memory controller on the NIC will look at the UDP destination port to determine if the command is for its subsystem• If the command is valid, it will be executed by subsystem hardwares as defined in the UDP data• UDP command data must be at a fixed offset from the IP header

Dest Src CRCEthernet Frame(RFC 894)

IPPacket

VersionHdr lenTOS

TTL,Proto

SourceIP

DestIP

UDP PacketTotal Length,ID,Flags, Frag Offset

Type IP Hdr UDP Hdr Data(0800) (Command)

2 6 2 4 4

246-1500

266

HdrCksum

2

Source PortNumber

Destination Port Number

UDP Length

UDPChecksum

2 2 2 18-14722

UDPPacket

Data(Command)

IP Command Format

26-1480

PACKET ID

TYPE

3 111

VERID

SECHDRFLAG

APP ID

1

SEQFLAGS

SEQCNT

2 14

PACKET SEQCONTROL

PKTLEN

16

SECONDARY HEADER DATA

CMDSEQ

COUNT

CCSDS Command Format

8

By-pass

ControlCmd Flg

=01

Flags

5

spare

Secondary header bit 0 = 0 for non-CCSDS-defined header .

1

6 byte primary header 2 byte sec. header

GSE

Ethernet/IP Multi-node Testbed

C&DH

I/F

IP/TCP/UDP

561 NIC

SFDUs

GOAL: Add subsystem simulators

CONFIGURATION:Addition of PSE & GNC SimulatorsAddition of 561 Switch

NB

SB

TO

ASIST

Stack

GSFC561 Driver

MEDIACONVERTER

SWITCH

PSE Simulator

IP/TCP/UDPIP/UDP

IP/UDP

MEDIACONVERTER

MEDIACONVERTER

GNCSimulator

CI

GSE

GPM-Ethernet Multi-node Testbed with File Delivery

C&DH

I/F

IP/TCP/UDP

561 NIC

SFDUs

NB

SB

TO

ASIST

Stack

GSFC561 Driver

MEDIACONVERTER

SWITCH

PSE Simulator

IP/TCP/UDPIP/UDP

IP/UDP

MEDIACONVERTER

MEDIACONVERTER

GNCSimulator

COMMROUTER

FileDelivery

CI