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e-EVN: practical considerations

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Presentation on theme: "e-EVN: practical considerations"— Presentation transcript:

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

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 N GE Lightpath 16 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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