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The research network serving for eVLBI application——CSTnet

The research network serving for eVLBI application——CSTnet. Xiaodan Zhang. Jun.2008. Outline. Introduction on CSTnet Testing and demo for eVLBI Challenge and thought. Development and resource. Export Resource. Incoming resources. Gloriad DV-NOC.

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The research network serving for eVLBI application——CSTnet

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  1. The research network serving for eVLBI application——CSTnet Xiaodan Zhang Jun.2008

  2. Outline • Introduction on CSTnet • Testing and demo for eVLBI • Challenge and thought

  3. Development and resource

  4. Export Resource

  5. Incoming resources

  6. Gloriad DV-NOC • http://dev.gloriad.org:8080/viz/dvnoc/dvnoc.html

  7. Background of BJLight • It’s built base on the project of CNGI • Having optical fiber connections with nearly 30 national science and technology networks cover many scientific areas • A exchange center on scientific data in China • Provide a platform and be a Promotion to national and international scientific cooperation and Application • Expansibility: abundant resources, dark fibers in Beijing(N*10G)

  8. Resources on Many Scientific Areas • China environmental Science Network • Chinese Area Integration science and technology Data Sharing Network • National Science and technology Library Network • Research of Petroleum Processing Network • National Center for Nanoscience and Technology Network • National Metrology Science Network • China Academy of Railway Sciences Network • China Water Resources and hydropower Research Network • Genomics Science Network • China Academy of Telecommunication Technology Network • Network of Chinese Center for Disease Control and Prevention • Chinese Academy of Social Sciences Network • Architectural Design Science Network • China Earthquake Data Center • China meteorological Data Sharing Network • China topography Science Data Sharing Network • China Forestry Data Sharing Network • Data-Sharing Network of Earth System Science • Network of Science on State Land and Resource • Sustainable Development Information Center • Geognosy and Mineral Resource Data Sharing Network • Chinese Medical and Health Network • China Communications Science Network • Basic Science Date Center • Advanced Manufacturing and Automation Network • China Hydrology Science Network • Chinese Academy of Agriculture Sciences Network

  9. Structure of BJLight

  10. Light path for eVLBI Netherland Seattle Beijing Xinjiang L.A. Shanghai Hawaii HK AU

  11. 2.5G 2.5G 10G 10G Beijing L.A. HK AU Seattle 2.5G 2.5G 10G HK Netherlands Chicago Seattle Gloriad-US 2.5G 2.5G 10G HK Chicago Seattle Light path status CN-AU eVLBI Jun.2008 CN-EUeVLBI Aug.2007 CN-USGloriad May.2006 Beijing

  12. Can’t support VCAT Drop in HK by VC4-4C 16VC4 VC4-4C VCAT 4*vc4 VC4-4C Encapsulation problem and solution 2.5G 2.5G 10G 10G Beijing HK L.A. AU Seattle Parkes,Mopra Sheshan, SH

  13. End to End Testing • Severs software Iperf version 2.0.2 Parameter:TCP windows size: 16M UDP bandwith:512M

  14. Test result for Sheshan and Parkes HKAU 622M Light path TCP:495Mbps LP:0% SHBJ L3 Network TCP:930Mbps LP:0% BJ HK 622M Light path TCP:490Mbps LP:0% Seattle BeiJing Los Angles ShangHai Hong Kong Honolulu Parkes

  15. Real-time Test Result on Jun 5

  16. Factors affecting the transmission rate • Network environment • Terminal Sever • System Kernel • Network Transfer Protocol

  17. Network Environment Seattle Chicago Los Angeles Hong Kong Honolulu Singapore Mopra

  18. Result

  19. Terminal Cases

  20. Network Transfer Protocol and other factors TCP Reliable Not so good bandwidth Fair Poor for long delay UDP No ACK Stable and high bandwidth Little data loss but OK Outstanding for long delay

  21. Challenges and Thought

  22. what we need? • Realtime • Long baseline between many telescopes 1000km ~ 20000km • No data loss, Some losses are tolerable • High speeds 128Mbps256Mbps  512Mbps  1024Mbps, more is better • Smooth, little jitter

  23. How to do it ? (1) • Transmit protocols UDP maybe is a logical solution Many researcher focus on it and make it applicable to all VLBI hardware and software Add some congestion control capabilities • Traditional multiple routes is hard to control, Light paths more better. Light path is still have problem, If point to point light path down….what you can do? Hybrid network Can we do some improves on our current network, Efficiency is important, can’t expand it blindly.

  24. How to do it ? (2) • Distributed framework distributed correlation • Parallel recording on hardware • Network traffic control • Dynamic Optical Networking • And so on

  25. Thanks!

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