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e-EVN: practical considerations

e-EVN: practical considerations. Arpad Szomoru. Outline. Work packages Currently underway Next. Work packages. Standard e-VLBI correlator mode: Wall-clock time vs ROT Centralized control Rapid response/ToO functionality: Real-time monitoring/feedback/analysis

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e-EVN: practical considerations

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  1. e-EVN: practical considerations Arpad Szomoru

  2. Outline • Work packages • Currently underway • Next

  3. Work packages • Standard e-VLBI correlator mode: • Wall-clock time vs ROT • Centralized control • Rapid response/ToO functionality: • Real-time monitoring/feedback/analysis • On-the-fly adjustment of observational/correlator parameters • Improved amplitude calibration • Data transport issues • Guaranteed (high) bandwidth • Transport protocols (modified TCP, UDP-based, VSI-e…) • Hardware issues • New control computers (reliability, speed) • Replacement of SUs (ageing, failing, rusting, unmaintainable, unfixable…) • Networking hardware (router, interfaces)

  4. e-VLBI correlator mode: control interfaces

  5. Monitoring tools: Integrating fringe display

  6. Monitoring tools: Data status monitor

  7. Rapid adjustment of correlator params: vex editor

  8. (near) Real-time analysis: streamlining of post processing

  9. Web-based Post-processing

  10. Current/future development • Telescope status monitor • Compilation of available telescope information • Adaptive scheduling • Capability to change order or length of observation of sources during experiment • Wb-based amplitude calibration • EVN calibration data not necessarily up-to-date • Logistical effort • Not only useful for e-VLBI (e.g. polarisation calibration)

  11. 1 Gbps 10 Gbps 155 Mbps 2.5 Gbps

  12. ORIENT: 2.5 G TEIN2: 622 M 100M 1G 155 M 2.5G 2.5G 34 M 50 M 1G 2.5G 1G SURFNet HKOEP Connectivity in/to China

  13. Connectivity improvements: Protocols: • Vlbi-udp under development in Manchester (Richard Hughes-Jones, Ralph Spencer & collaborators) • TCP modifications (Sansa, Kettenis). Issues with Mark5A code and newer Linux kernels • VSI-e. Needs Mark5B.. • Other protocols (tsunami?) Lightpaths across Europe • Affordable (probably for free) and available right now • Easily expandable

  14. Hardware New control computers • Solaris AMD servers, redundant power supplies • Interchangeable for maximum reliability • Cut down dramatically on (re-)start time • Removal of single points of failure Mark5 upgrade: • Motherboards, memory, power supplies • Mark5A→B: serial links, CIBs

  15. Network upgrade at JIVE: SX optics, router GÉANT Mk5 16 GE Lightpath N GE Lightpath OME network OME network Router Mk5 Mk5 Dynamic capabilities through DRAC 10 G IP IP/Lightpath Production e-VLBI via lightpaths Mk5

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