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E-VLBI Progress with the LBA

E-VLBI Progress with the LBA. Chris Phillips, eVLBI Project Scientist November 2011. The LBA. Katherine. ATCA. Mopra. ASKAP. Parkes. Ceduna. Yarragadee. Tidbinbilla. Warkworth. Hobart. Network Links. ATCA. Mopra. ASKAP. Parkes. Ceduna. Tidbinbilla. AUT.

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E-VLBI Progress with the LBA

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  1. E-VLBI Progress with the LBA Chris Phillips, eVLBI Project Scientist November 2011

  2. The LBA Katherine ATCA Mopra ASKAP Parkes Ceduna Yarragadee Tidbinbilla Warkworth Hobart

  3. Network Links ATCA Mopra ASKAP Parkes Ceduna Tidbinbilla AUT Existing AARNet DWDM Network R+E DWDM Network (Under Installation) Hobart Future R+E DWDM Network

  4. Mount Pleasant (University of Tasmania) • 10 Gbps connection across Bass Strait • Wavelength, not fibre • Upgraded Mark5a and tested with eVLBI • Tested Mark5B+ for eVLBI compatibility • University infrastructure does not support jumbo frames, jive5ab (at time of testing) required them CSIRO. eVLBI Oz 2011

  5. Warkworth • See Tim’s talk next • 1 Gbps link NZ to Australia • eVLBI with DBBC/Mark5b achieved easily in February 2011 @ 512 Mbps CSIRO. eVLBI Oz 2011

  6. Hartebeesthoek • First eVLBI test run to LBA on 25 November 2010 • Using Mark5a hardware • Immediate fringes @ 512 Mbps CSIRO. eVLBI Oz 2011

  7. KVN • KVN-LBA tests planned for the next few weeks CSIRO. eVLBI Oz 2011

  8. e-Transport • All stations except Ceduna using e-Transport of data to a 3rd party data store • Tidbinbilla USB disk shuffle • Using grid-FTP, no certificates • Most sessions no disk swapping • ATCA 36 TB disk array • Parkes 48 TB disk array • Typically 100 TB/session • Typically no faster than mail • Kinder to disks • Lower overhead to staff CSIRO. eVLBI Oz 2011

  9. Parkes Data Store • 100% COTS solution • 4 U chassis with 24 2 TB SATA disks • SuperMicro • Adaptec hardware RAID card • ATCA Sun “Thumper” • 28x750 GB CSIRO. eVLBI Oz 2011

  10. ASKAP VLBI backend • ASKAP VLBI backend developed at Curtin by PhD student Bruce Stansby • Based on Signatec PX14400 sampler card • PCI-E x8 card • Dual channel 400 Mbps/14 bit (200 MHz bw) • Lab test dual pol 128 MHz • Deployed as 64 MHz dual • 4 Gbps recording ontoCOTS RAID0 CSIRO. eVLBI Oz 2011

  11. ASKAP eVLBI • Software conversion to 2 bit with AGC • Requires a few dedicated cores • Write to network or disk • Short term total power for free • 4 msec minimum integration time • 10s usec possible easily • Flexible design • Modified code to realtime spectrometer • Formats data as LBADR, Mark5B or VDIF • Still limited to 64 MHz bandwidth • First fringes 27 June 2011 • 128 MHz dual pol should work fine CSIRO. eVLBI Oz 2011

  12. PKS0637-752 ATCA image by L Godfrey (Curtin University)

  13. Banff SKA Forum e-VLBI demonstration • Live eVLBI demonstrated during Minister for Science press conference CSIRO. The high resolution component of ASKAP

  14. DIFX2.0 – Zoom Bands • DIFX Zoom Bands allows correlation of different bandwidth without resampling • Particular importance with ASKAP with inflexible sampling system • Use in fringe test in June 2011 • 1x64 MHz at Mopra, 3x16 MHz at other stations • 2x8 MHz zoom bands correlated CSIRO. eVLBI Oz 2011

  15. AARNet 40 Gbps trials • AARNet using CSIRO links to telescopes to test roll out of CISCO 40 Gbps technology • Parkes to ATCA, via Sydney • Deliberately long to showcase technology • Only requires upgrade of endpoint equipment, long haul infrastructure remains (optical amplifiers etc) • Current fibres support 80 wavelengths for a total of 3.2Tbps • 8 Tbps using 100 Gbps technology CSIRO. eVLBI Oz 2011

  16. Contact Us Phone: 1300 363 400 or +61 3 9545 2176 Email: enquiries@csiro.au Web: www.csiro.au Thank you Astronomy and Space Science Chris Phillips e-VLBI Project Scientist Phone: 02 93724608 Email: Chris.Phillips@csiro.au Web: www.atnf.csiro.au

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