AMSYS Workshop ASP A. ROLLA P. WUILQUE Nom Fichier - 18/02/2003-1
AMSYS Workshop Content Simulation and validation approach Network Engineering Platform Multimedia System Validation Test-bed Nom Fichier - 18/02/2003-2
AMSYS Workshop Simulation/Validation approach Feasibility and early definition phases simulation simulation of system behavior emulation of new functionality trade off and benchmarking on existing technologies Design phase Early design validation made by software emulation Design validation by introducing, step by step, breadboards on a testbed. Preliminary assessment on performances. The successive phases are characterized by a progressive substitution of the breadboards with more representative equipment. Nom Fichier - 18/02/2003-3
Network Engineering platform Network Engineering Platform NEP Nom Fichier - 18/02/2003-4
Network Engineering platform Context The Network Engineering Platform is developed internally by ASP Main requirements : Compliance with the SATCOM DVB-RCS product Flexibility to support some enhancements (protocols, applications ) Fully integrated with COTS Network products Main objectives : Feasibility study for the new release of products Performance study for the new release product features Real time application demonstration Validation of Network architectures Nom Fichier - 18/02/2003-5
Network Engineering platform System emulation Emulated System architecture SOHO SME Router Router Remote Corporate Cache Cache Access Network Gateway Earth Station Master cache Streams control HUB Management Platform (proxy AAA) IP RAS VoIP Gateway AAA Portal Content MM call server PSTN Backbone VPN Content ISP Network Portal Firewall Corporate Intranet Edge WWW Internet AAA Content Provider Nom Fichier - 18/02/2003-6
Current System main features: Network Engineering platform System emulation Two-way multimedia system over GEO bent pipe satellite Available in Ku and Ka band delay loss models Based on DVB-RCS standard MPEG2/DVB-S on the forward link ATM/DVB-RCS on the return link with a DAMA scheme Dedicated to IP V4 Possible evolution to multispot OBP systems A wide variety of services are provided including: Fast Internet Access Virtual Private Networks IP Multicasting All Multicast and Unicast IP applications are supported! Nom Fichier - 18/02/2003-7
Network Engineering platform Functional architecture Application Servers & MBONE End User LAN Network Load Multicast IP Router BAS and GATEWAY Earth Station DiffServ, Multicast IP Router PPPoE Server Broadband Access Server Network Interfaces (NIC) Gateway Forward Segmenting M M T Gateway Return Relay Dynamic Access Load 1: IP Access Mode NIC : Return Link Return Segmenting NIC : Forward Link DVB-S Emulation ATM Link - SDH over OC3 GW Forward Scheduler Virtual BoD Requester BoD Requester MAC DVB Synchronization GW to s Satellite Link (Forward) s to GW Satellite Link (Return) Bidirectional DAMA Signaling Channels (BoD requests / TBTP) Quasi-Static Access Load CAC BoD Controler BoD Requester MAC DVB-RCS Signaling Return Segmenting DVB-S Emulation BoD Configuration Return : ATM/DVB-RCS Forward : MPE/MPEG2/DVB-S ATM Cells 2 : PPPoE Access Mode NIC : Return Link PPPoE Client NIC : Forward Link MPE Sections IP Packets Ethernet Frames (PPPoE Mode) DiffServ, Multicast IP Router End User LAN Nom Fichier - 18/02/2003-8
Network Engineering Platform Functional architecture Access functions Innovative real-time centralized access function enabling to avoid the signaling exchange inter-machines Forward link : Segmentation/Reassembly MPE/MPEG2 Bandwidth management (QoS) per PID similar to IP gateway management Return link : Segmentation/Reassembly AAL5/ATM Bandwidth management based on DAMA schemes In Software modules which enable Access function flexibility... Nom Fichier - 18/02/2003-9
Different access scheme Networking Functions Native IP with a static IP address assignment Network Engineering Platform Functional architecture ADSL in the sky : PPPoE access with a dynamic IP address assignment Multicast : Multicast protocol adaptation to the satellite context Benchmarking of Reliable multicast solutions QoS : QoS management in the satellite terminal Security : Ciphering / key exchanges schemes TCP acceleration : Benchmarking of Solutions VoIP demonstration : VoIP architecture demonstration And Much More... Nom Fichier - 18/02/2003-10
Network Engineering Platform Hardware architecture Platform based on standard LINUX PC (kernel 2.4) for the BAS, Satellite Access and the IP Satellite Easy reuse of Network modules available in the LINUX community Fully integrated in a Real System Architecture : Standard CPE (with any OS) COTS Network products Centralized platform control and monitoring Nom Fichier - 18/02/2003-11
Network Engineering Platform Hardware architecture Server CPE ADSL/RNIS Access Router INTERNET NEP Controller Satellite Access: s & Hub, Satellite Emulation Hub OC-3 ATM Ethernet BAS / ROUTER Ethernet Switch Sat. Term. IP Sat. Term. IP Sat. Term. IP BAS CPE 4 ADSL Modems CPE1 CPE2 CPE3 DSLAM CPE 5 Nom Fichier - 18/02/2003-12
Multimedia System Validation Test-bed Multimedia System Validation Test-bed MSVT Nom Fichier - 18/02/2003-13
Multimedia System Validation Test-bed Context The MSVT is developed by ASP under CNES contract Main requirements : Validation Test bed for Regenerative DBV-RCS GEO satellite Flexible and Modular for potential evolution and adaptation to future systems Main objectives : Early validation system before commercial phases C/D Functional tests on a loaded system Performances measurements on a loaded system Nom Fichier - 18/02/2003-14
Multimedia System Validation Test-bed Targeted system Regenerative Payload G/W Links User Links DVB-RCS uplink DVB-S downlink Gateways B-ISDN, ISDN, IP NCC User s Multi -beam coverage SCC NMC ISDN B-ISDN NCC SCC NMC = Integrated Services Digital Network = Broadband ISDN = Network Control Centre = Satellite Control Centre = Network Management Centre Nom Fichier - 18/02/2003-15
Multimedia System Validation Test-bed functional Architecture This physical link model takes the place of one logical link emulator for validating the interface between the physical and MAC layers Onboard Modem Breadboard Radio link Emulator Modem Breadboard Logical link Emulator Access Onboard ATM Switch Breadboard Logical link Emulator Logical link Emulator Access Access Logical link Emulator Network Control Center Simulator User User WAN Nom Fichier - 18/02/2003-16
System under test is represented by : Multimedia System Validation Test-bed Functional Architecture Breadboards (OBP ATM switch, OBP Demodulator) developed for a given project (ex. DOMINO 2) allow validation of feasibility of the equipment some features identical to target equipment Simulated Models (OBP controller, NCC) extracted from real time simulation platform behaves similarly to its target equipment Hardware/software models (NAT and ST / Access and physical Layer) generic limited representativeness due genericity purposes Nom Fichier - 18/02/2003-17
Multimedia System Validation Test-bed Functional Architecture Link emulators are either Physical delay, Doppler, phase noise, thermal noise or Logical delay A set of Test-bed Equipment Stimulators Analyzer synchronization of equipment Monitoring and exploitation of results Nom Fichier - 18/02/2003-18
Multimedia System Validation Testbed Validation Area Uplink Physical Layer Transmission BER, PER, CLR Measurements Radio spectral analysis, QPSK modulation analysis Synchronization and power Control Analysis of the NCR rebuilding Synchronization loop Power control schemes Nom Fichier - 18/02/2003-19
Multimedia System Validation Testbed Validation Area Access Layer protocols : Connection control DAMA schemes traffic exchanges between users System under Load Validation Services Demonstration Nom Fichier - 18/02/2003-20
Multimedia System Validation Testbed Target Systems The following systems will be validated with the MSVT : DOMINO2 On-Board ATM Packet switch+ ATM cell MCDDD DVB-RCS on the Uplink DVB-S on the Downlink AMEHRIS On-Board MPEG2 Circuit Switch+ MPEG packet MCDDD DVB-RCS on the Uplink DVB-S on the Downlink Nom Fichier - 18/02/2003-21