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COMED ATM Payload Demonstrator

ATM-Workshop, Berlin, June 19, 2002


B. HespelerTesat-Spacecom

71522 Backnang, Germany



(1) Application Scenarios and Reference Payload Architecture

(3) COMED ATM Payload Demonstrator - Rationale and Objectives

(4) DVB-S Demodulator

(5) ATM Switch

(6) DVB-S Modulator

(7) Demonstrator Configuration and Tests Performed

(8) Conclusion

Table of Contents



Spotbeams

TV BroadcastProviders

Internet ServiceProviders

CoporateNetwords

Small User Terminals

Small User Terminals

Communication SatelliteServices:

Forward Links: - Digital Video Broadcast- Remote Video Broadcast- Internet Services

GEO - Broadband Satellite Systems

Return Links:- Video on Demand - Web Browsing- High Data Rate

Return Links

On-Board Functions:

- DemodulationHigh Data Rate Links: DVB-S Low Data Rate Links: DVB-RCS

- SwitchingATM / MPEG-Mux

- ModulationDVB-S



MEO - Communication Satellite Systems

Services: Symmetrical Links between Fixed Ground Stations or Vehicels, e.g. Leased Lines at 155 Mbps (STM-1)

Switching Scheme: ATM, Quasi-Static Connections

Transmission Waveform: DVB-S

Intersatellite Links: Optical

Throughput : 1 - 5 Gbps

Example: MEDIS



Reference Architecture of On-Board Processing Payload

FDMUXSynchron.Demod.

Decoder

ATM Cell Switch

orMPEG2-TSMultiplexer

InputProcess

DVB-S Demodulators( 1 - 50 Mbps)...

FramingEncoding

ModulationOutputProcess

DVB-S Modulators (50 Mbps)

High Data RateReturn LinksDVB-S n x (1 ... 50 Mbps)

...

...

...

...

... DVB-Sk x 50 Mbps

OBP Controller

FDMUX Synchron.Demod.n

Decoder

DVB-RCS Multi-Carrier Demodulator

...InputProcess

Low Data RateReturn LinksDVB-RCSl x 144 ... 2048 kbps

...

ATM / MPEG2 Packet Switch

User Return LinksUser Forward

Links

Gateway ForwardLinks

DVB-Sm x 50 Mbps

Synchron.Demod. Decoder

InputProcess

DVB-S Demodulators (155 Mbps)

...

...

...

FramingEncoding

ModulationOutputProcess

DVB-S Modulators (50 Mbps)

...

...

...

DVB-Sm x 50 Mbps

Gateway Return Links

On-Board Data Handling



COMED ATM Payload Demonstrator - Rationale and Objectives

Attractive Applications of On-Board Processing Payloads in the Field of Broadband GEO Systems and MEO Systems

Support of German Satellite Industry Necessary to Compete

Tesat-Spacecom and German DLR Initiated the COMED Program with the Following Objectives:

Development of the Basic Technology for On-Board Demodulators and Switches

On-Ground Demonstration of Technology and Capability at Tesat

In-Orbit Verification Envisaged



Characteristics Of DVB-S Demodulator

Parameter Value UnitTransmission Standard DVB-S -

Modulation Scheme QPSK -Decoding Reed-Solomon + Viterbi -

Synchronisation Carrier Frequency and PhaseClock Frequency and Phase

-

Input IF Frequency 0 ... 475 MHzNumber of Carriers 1 ... 5 -Carrier Bandwidth 1 ... 50 MHz

Total Input Bandwidth Max. 200 MHzUser Data Rates per Carrier 1 ... 100 Mbps

Overall Data Rate Max. 200 MbpsEb/N0 @ BER = 10-10 7.5 dBPower Consumption 15 (155 Mbps Version) W

Mass 3 (155 Mbps Version) kgStatus DVB-S Demodulator ASIC under De-

velopment, EM in Q4/2002-



Architecture of On-Board DVB-S Demodulator (155 Mbps)

AD-Conversion

DVB-SDemodulator and

Decoder CoreDVB-S

Demodulator andDecoder Core


Decoder CoreDVB-S

Demodulator andDecoder Core


Decoder Core

ChannelizerFPGA

De-serializer

1:4

8 BitData

4x8 BitData

Clock Factory

Configuration and Telemetry

Test Interface

Power Supply

Digital Signal Processing

8bit Data

8bit AddrTMTC

IF-Input-signal

JTAG

Supply-Voltages

UserData

Interface

User Data

Data Clock

IF = 475MHz

Total BW = 150 MHz

155 Mbps

400 MHz 100 MHz

5x8 Bit Data



Broadband Analog-to-Digital Interface

A/D-Converter

Deserializer (with Active Cooler)

Functions: A/D-Conversion,Deserializer 1:2:4:8

Sampling Scheme Bandpass-Sampling A/D-Wordlength 8 bitEffective Wordlength 7 bitInput Frequency up to 1.5 GHzSampling Rate up to 1 GspsPower Consumption 10 WTechnology Space Qual. A/D-ConverterStatus Breadboard Verified

Frequency/MHz1 2 3 4 5

AnalogAA Filter

FS FIF

1 2 3 4 5400 500100 200

ISI 150 MHz

Image Original



On-Board ATM Switch -Design Trade-Offs

RequirementsSwitching Scheme Independent of Transmission ProtocolSupport Various Transmission Protocols: ATM, MPEG-Mux, IP, MPLS Scalability (Throughput 1.2 Gbps ... 10 Gbps)Support Quasi Static Connections

Technical SolutionUse Internal Label Switching (Insertion of 10 Byte Header) Separate Application Specific Functions and Generic Functions

Physical Layer Interface Unit (to Interface to Mod./Demod.)Port Controller (to Adapt to Switching Scheme) Generic Switch Element (to Perform Switching)

High Speed Data Interfaces to Interconnect Functional BlocksConfiguration of Links (VCI/VPI) through Controller Interface

ATM Cell (53 Byte)

Label(10 Byte)



Architecture of ATM-Switch Demonstrator (1.2 Gbps)

PCI/CPCIBridge

SpaceWire Links

To/From TM/TCInterface

PCI / Compact PCI Backplane

Loca

l PC

I Bus

Compact PCI Housing

Loca

l PC

I Bus

UTOPIA

Switch Element

Loca

l PC

I Bus

From Demodulator155 Mbps 1 2 3 4

Carrierboard Carrierboard ControllerBoard

CPCI BusPCI Bus

To Modulators155 Mbps

PCI/CPCIBridge

PCI/CPCIBridge

To/From ATM TestEquipment

ATMSwitch PortController

ATMSwitch PortController

Utopia toSpaceWireInterface

PowerPCControler

PHY SAR

ATMNTC

5 6 7 8

PhysicalLayer

InterfaceUnit

Physical Layer

Interface Unit

From Demodulator155 Mbps

To Modulators155 Mbps

ATMMPEG2......

......



FPGA DevelopmentsATM Switch Element

8 x8 Switch Matrix, 1,2 Gbps Throughput, Internal Packet Format Supports Various Packet Formats (MPLS, ATM, IP, MPEG2)Status: Verified in Target System

ATM Switch Port ControllerAdaption of ATM Cells to Internal Packet FormatStatus: Verified in Target System

Utopia to SpaceWire InterfaceAdaption of SpaceWire Interface to Utopia InterfacesStatus: Verified in Target System

Physical Layer Interface UnitInterface to Demodulator/Modulator Status: Verified in Target System

All FPGAs Realised with Xilinx Virtex IIDesign Is Compatible to Space Qualified ASICs



ATM-Switch - Hardware

ATM Port Controller/SwitchElement

Utopia toSpaceWire/Mod-Demod

Interface

User DataInterfaces

SpaceWire8 x 155 Mbps

Configuration& Monitoring

PCI BusInterface

Univeral ATM Switch Board (FPGA Based)

Univeral ATMSwitch Board

Compact PCI Unit



Architecture of On-Board ATM-Switch (5 Gbps)

SwitchPort

Controller

SwitchPort

Controller

SwitchPort

Controller

SwitchPort

Controller

SwitchPort

Controller

OISLT

Modulator

Multi CarrierDemodulator

Modulator


SwitchElement

8x8

SwitchElement

8x8

SwitchElement

8x8

SwitchElement

8x8

SwitchElement

8x8

SwitchElement

8x8

SwitchElement

8x8

SwitchElement

8x8

SwitchElement

8x8

SwitchElement

8x8

SwitchElement

8x8

SwitchElement

8x8

5Gbps/32-PortSwitch

PhyLayer

InterfaceUnit

Modulator

Multi CarrierDemodulator Phy

LayerInterface

Unit

Port 1

Port 2

OISLT

Port 15

Port 16

Modulator

Port 17

Port 18

Port 31

Port 32


Port 24Port 8

Modulator

Multi CarrierDemodulatorPhy

LayerInterface

UnitModulator


Modulator

Multi CarrierDemodulator Phy

LayerInterface

Unit

PhyLayer

InterfaceUnit Modulator


SwitchPort

Controller

PhyLayer

InterfaceUnit

PhyLayer

InterfaceUnit

SwitchPort

Controller

SwitchPort

Controller

SwitchPort

Controller

SwitchPort

Controller

PhyLayer

InterfaceUnit

PhyLayer

InterfaceUnit

PhyLayer

InterfaceUnit



OBP-Controller Software

Embedded Software: Control and Configuration of Switch and DemodTM/TC InterfacePower PC, Vx-Works, C

Satellite Ground Terminals:IP-ApplicationsLinux PC

Control Station:Configuration of OBP (Link Management)Graphical User InterfaceWindows NT, Java

TCPApp.

IPEth-MACCLIP

AAL5ATM

IPEth-MACCLIP

AAL5ATM

TCPApp.

IPEth-MAC

IPEth-MAC

ATM

TCPApp.

IPEth-MAC

ATMAAL5ATM

UDPApp.

IPEth-MAC Eth-MAC

ATM

OBPATMSGTATMSGTAPP

UDPIP

Multicast-ProxyAAL5Multicast-Proxy

Eth-MAC

UDPIP

Unicast-Szenario

Multicast-Szenario

SGTATM SGTAPP

OBPATMSGTATMSGTAPP SGTATM SGTAPP

SpaceW SpaceW SpaceW SpaceW

SpaceW SpaceW SpaceW SpaceW



Characteristics of On-Board ATM-Switch

Parameter Value UnitSwitching Architecture Shared Memory, Label

Switching-

Supported Transmission Protocols/Formats IP, ATM, MPLS, MPEG2 -Switch Matrices 8 x 8, 16 x 16, 32 x 32 -

Data Interfaces (SpaceWire) 155 MbpsThroughput of Single Switch Element 1.2 GbpsMax. Throughput (4 Level Cascade) 10 Gbps

Status FPGA Based Demonstator Suc-cessfully Tested,

Concept and Parts Transferableto Space Qualified Hardware

-



Characteristics of On-Board DVB-S Modulator

Parameter Value UnitOperating Freq. Range 17.7 ... 20.2 GHz

Modulation Scheme QPSK -Formatting and Coding According to DVB-S Std. -Transmission Data Rate Up to 70 Mbps

Carrier Suppression > 30 dBSingle Sideband Suppression > 30 dB

RF Output Power -20 ... 0 in Steps of 0.5 dB dBmAmplutide Accuracy 0.2 dB

Phase Accuray 3 Deg.Size 142 x 86 x 15 mm³Mass 250 g

Power Consumption 4 WTemperature Range -20 ... + 60 °C

Status EQM Successfully Tested -



Block Diagram of On-Board DVB-S Modulator

Microwave Section

Baseband Section

Analogue I/Q Modulator

90°

CONTROLSECTION

LO_i

n

QPS

K_ou

t

DA

DA

Formatter

SOSF

Clock1

Clock2

DATA

+6V

-6V

SDB

+3.1

V 6

+5V

-5,2

V

+ 3V

V



On-Board DVB-S Modulator - EQM

FormatterEncoder/

ASIC

D/A-Converters

Direct Modulator

MIC



Overview of COMED OBP Payload Demonstrator

Sat. GroundTerminalSimulator

Data Link(Ether/IP)

Demonstrator Local Area Network (DLAN)

ApplicationTerminal

(PC)

Data Link(Ether/IP)

Data Link(Ether/IP)

ApplicationTerminal

(PC)

ApplicationTerminal

(PC)

Test Monitoring& Control Station

(PC)

ATM Cell Generatorand Analyser

Test DataLink

(UTOPIA)

On Board Switch

Test Modulator

DVB-SDemodulator

OBP Payload Demonstrator

HP ATM TestEquipment

DVB-SModulator



RF-Link

Data Links (SpaceWire)



ATM-SwitchSatellite Ground Terminals 1... 3




Configuration of Demonstrator



Configuration of Connections



Configuration of ATM Switch Port Controller



COMED OBP Payload Demonstrator

Analysis of Switching Characteristics under Various Application and Load Conditions

Throughput Cell Loss RateBack Pressure Mechanism

Characterisation of End-to End Data TransmissionBit Error RateQuality of Service (Jitter) etc.

Demonstration of Unicast and Broadcast Applications

Demonstration of IP-Applications (IP-Radio, MP3 Streaming)

Demonstration of Complete DVB-S / ATM Based Communication System with Real Hardware Suited to be Transferred to Space Qualified Technology



Conclusion

On-Board Equipment under Development at Tesat-SpacecomDVB-S DemodulatorATM-SwitchDVB-S Modulator

Attractive Technical Solutions Available Flexibility in Data Rates, Carrier Frequency, Transmission ProtocollsExcellent Performance Concepts Providing Minimum Mass and Power

Functions Verified through COMED ATM Payload Demonstrator

Transfer to Space Qualified Hardware Feasible

Prepared to Deliver Flight Hardware

comed atm payload demonstrator - emmelmann.org€¦ · atm-workshop, berlin, june 19, 2002 comed...

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