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e-VLBI Development at Haystack Observatory

e-VLBI Development at Haystack Observatory. Alan R. Whitney Kevin Dudevoir Chester Ruszczyk Jason SooHoo. 5 th Annual e-VLBI Workshop Haystack Observatory 20 September 2006. Current Projects at Haystack Observatory. Network interfacing equipment for e-VLBI Mark 5 VLBI data system

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e-VLBI Development at Haystack Observatory

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  1. e-VLBI Development at Haystack Observatory Alan R. WhitneyKevin DudevoirChester RuszczykJason SooHoo 5th Annual e-VLBI WorkshopHaystack Observatory20 September 2006

  2. Current Projects at Haystack Observatory • Network interfacing equipment for e-VLBI • Mark 5 VLBI data system • Standardization (VSI-E) • Intelligent Applications • Automation of e-VLBI transfers an ongoing process • Development of optimization-based algorithms for intelligent applications ongoing (EGAE) • Intelligent optically-switched networks (DRAGON) • e-VLBI test experiments • Production e-VLBI • Put e-VLBI into routine use – progressing well in limited venues • Support e-VLBI development for VLBI2010 initiative

  3. Scorecard of Antenna/Correlator Connectivity • JIVE Correlator (6 x 1 Gbps) • Haystack (2.5 Gbps; plans to expand to 10Gbps) • Westford, MA (10 Gbps to Haystack; 1 Gbps to outside world) • Kashima, Japan (2.5 Gbps) • Usuda, Japan (2.5 Gbps) • Nobeyama, Japan (2.5 Gbps) • Koganei, Japan (2.5 Gbps) • Metsahovi, Finland (1 Gbps) • MPI (1Gbps) • Tsukuba, Japan (2.5 Gbps) • GGAO, MD (1 Gbps) • Onsala, Sweden (1 Gbps) • Torun, Poland (1 Gbps) • Westerbork, The Netherlands (1 Gbps) • Medicina (1 Gbps) • NyAlesund – (~80 Mbps) • Jodrell Bank (1 Gbps) • Arecibo, PR (155 Mbps) • Wettzell, Germany (~30 Mbps) • Kokee Park, HA (nominally ~30 Mbps, but currently disconnected) • TIGO (~2 Mbps) • Svetloe (speed unknown) In progress: • Hobart – expect fiber to station by Feb 2007 • Forteleza – funds secured for fiber connection at 2.5Gbps; contract has been signed; expect completion Feb 2007 • Zelenchukskaya – details unknown • Badary – details unknown

  4. VSI-E • Goals: • Efficient transport mechanism • Standard protocols • Internet-friendly transport • Scalable to 100Gbps • Suitable for real-time, quasi-real-time, and post-real-time data transmission • Ability to make use of multicasting to transport data and/or control information in an efficient manner • could be used in the future for support of distributed correlation

  5. VSI-E Status • Beta version of VSI-E is being tested in transfers from Kashima to Haystack and NyAlesund to Haystack (has been somewhat delayed by network availability at Haystack); expect result soon • Awaiting successful demonstration before final ratification; plan submission to Internet Engineering Task Force (IETF) as international standard • Working to make fast, efficient VSI-E implementation on Mark 5B

  6. DRAGON Collaboration • Collaborative development of API for control of dynamically optically switched networks • e-VLBI experiments using DRAGON optically-switched networks over part of the path • 512Mbps intercontinental real-time demonstration at SC05 in Seattle

  7. Bossnet Route

  8. Real-time e-VLBI SC05 DemoNov 2005 Real-time transmission and processing of data from antennas in Westford, MA, Greenbelt, MD, and Onsala, Sweden at 512 Mbps/antenna All except Kashima equipped with Mark 5 data systems; Kashima uses Japanese K5, included via VSI-E Correlation results displayed inreal-time at SC05 meeting

  9. Progress towards routine e-VLBI • April 2005 • Start routine e-VLBI transfer from Kashima and Tsukuba (>200Mbps) • Starting ~June 2005 • Automated regular e-VLBI UT1 Intensive data transfers from Wettzell to ISI-E (disks hand-carried to USNO for correlation) • A few start-up problems, but now operating fairly smoothly • Spring 2005 • Commitment to connect Hobart via optical fiber (schedule unknown) • September 2005 • All CONT05 data from Tsukuba transferred to Haystack via e-VLBI • Also – all Kashima and Syowa data now transferred via e-VLBI from Japan to Haystack • November 2005 • Project initiated to connect NyAlesund to Haystack through NASA/GSFC at up to 100Mbps • Data now transmitted routinely from NyAlesund, but slow data rate of ~80Mbps does not allow all data to be transferred; decision by NMA is pending whether to continue, upgrade, etc. • December 2006 • Funds secured to connect Fortaleza at 2.5 Gbps;will in place by Feb 2007

  10. Total data transferred: Tsukuba ~66TB Kashima/Syowa ~8TB NyAlesund ~6TB

  11. EGAE Progress • ‘Production’ e-VLBI facility has been established at Haystack to support routine e-VLBI transfers • EGAE is now supporting routine non-real-time e-VLBI data transfers from Tsukuba • EGAE will soon be used for routine e-VLBI transfers from Wettzell and NyAlesund

  12. File-naming for Mark 5B/e-VLBI For disk2file operations, Mark 5B has adopted the internationally agreed e-VLBI file-naming convention that uniquely identifies the data and carries all information necessary to satisfy VSI-E requirements, namely: <exp name>_<stn code>_<scan name>_bm=<bit-stream mask>.m5b Example: ‘exp103_ef_scan001_bm=0x0000ffff.m5b’ A file2disk operation will parse the file name and preserve all relevant information. Universal adoption of the internationally agreed conventions will result in easier e-VLBI data transfers with fewer errors.

  13. Future directions • Continued e-VLBI performance improvements, particularly with Mark 5B • Continuing development and support of routine e-VLBI transfers; distribution of EGAE software package to others (MPI, etc) • e-VLBI with 10GigE connections; motherboard and NIC performance evaluations • Development with community of high-speed serial specification forVSI-E (10GigE, etc) • Investigation of the use and value of Network Attached Storage as temporary buffer for e-VLBI data • Collaboration with NROA/VLBA in e-VLBI development and (hopefully) deployment • Continued close association with national and international community for global e-VLBI development and advocacy

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