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NEXPReS Period 3 Overview The hunt for 4Gbps fringes Or, may the fringe be with you Or, nothing like living on the edge Arpad Szomoru, JIVE
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4Gbps demo June 2012. A success (…) NEXPReS P3 Review – Dwingeloo, NL - 19 September 2013 Slide: 2
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What was needed for demo DBBC: digitize/packetize telescope signal Output on VSI, record on VSI-capable recorder (Mark5B/B+) With two B+ recorders, 4Gbps recording possible But only 2Gbps real-time Fila10G: takes DBBC output and converts it to 10GE Mark5B or VDIF Two 10G outputs: one to Mark5C recorder, one to correlator Harrobox: receives 4Gbps from Fila10G splits it into 4 1Gbps chunks (partial corner turn) streams to SFXC correlator NEXPReS P3 Review – Dwingeloo, NL - 19 September 2013 Slide: 3
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Final review demo Suggested to take place during final review (because what could possibly go wrong…) Three stations real-time at 4Gbps, closure phases Absolutely needed: Fila10G Onsala (board sent back to Medicina) Yebes (board sent back to Metsahovi) Working firmware previous version written for 2Gbps… Metsahovi joined team NEXPReS P3 Review – Dwingeloo, NL - 19 September 2013 Slide: 4
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The (tragic) Fila10G story Autumn 2012: Onsala and Yebes order Fila10G boards eta ~ December 2012 Jan 2013: On board X-ray testing, Ys board swapped for Nt ~ 2 weeks until delivery March 27: problems with boards (they do not work) (at all) X-ray tomography planned May 9: tests show missing connections and shorts in PCB 4 unpopulated boards available, + components But tests needed June 4: tests ok, but reason for problems still unclear Aug 9: four Fila10Gs have left manufacturer Aug 27: boards in Catania for final modifications and fixes Then to Effelsberg for final mounting 2 weeks ago: On receives board 1 week ago: Ys receives board NEXPReS P3 Review – Dwingeloo, NL - 19 September 2013 Slide: 5
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Desperate measures August 2013: I start hyperventilating But! Hartebeesthoek (South Africa) has 2 DBBCs and 2 FIla10Gs…. Very very very polite request to lend us those Fila10Gs But installed inside DBBCs, not trivial to extract, no enclosure, power supply Then realisation that connection to Hh is not limited to 2Gbps…. Hh on the team Needs to fix LO setting Needs Harrobox Sent from Torun (Poland) to Hh Arrived last week Ordered optical module But no-one knows when it will arrive JIVE orders one in Germany, arrived last week NEXPReS P3 Review – Dwingeloo, NL - 19 September 2013 Slide: 6
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Who needs testing? Early 2013: everything tested that can be tested Waiting for new firmware, hardware to arrive Summer arrives Still no Fila10G No new firmware Ef under maintenance People go on vacation!! End of August: new firmware!! Only Mh available for tests Results not encouraging But probably caused by lack of knowledge of hardware Last Monday: first opportunity EVER to run setup with real telescopes At end of day: fringe Mh – Ys, 16Gbps into JIVE End of Tuesday: reason for lack of fringes to other telescopes (probably) known NEXPReS P3 Review – Dwingeloo, NL - 19 September 2013 Slide: 7
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Final setup NEXPReS P3 Review – Dwingeloo, NL - 19 September 2013 Slide: 8
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Result….. NEXPReS P3 Review – Dwingeloo, NL - 19 September 2013 Slide: 9
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Result…? NEXPReS P3 Review – Dwingeloo, NL - 19 September 2013 Slide: 10
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Questions/Comments Contact Information: Arpad Szomoru Head Technical Operations and R&D JIVE szomoru@jive.nl Additional information available via http://www.nexpres.eu/ NEXPReS is an Integrated Infrastructure Initiative (I3), funded under the European Union’s Seventh Framework Programme (FP7/2007- 2013) under grant agreement no RI-261525. Slide: 11 NEXPReS P3 Review – Dwingeloo, NL - 19 September 2013
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