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eVLBI Implementation

eVLBI Implementation. Steven Durand National Radio Astronomy Observatory, a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc. NRAO Five Year Plan. Work with Haystack Observatory,

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eVLBI Implementation

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  1. eVLBI Implementation Steven Durand National Radio Astronomy Observatory, a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc. Haystack - NRAO Collaboration

  2. NRAO Five Year Plan • Work with Haystack Observatory, and this eVLBI consortium, to seek out opportunities for collaboration • Fund a test eVLBI connection to Pie Town • Increase VLBA Bandwidth (1-2 GHz) Haystack - NRAO Collaboration

  3. Present Pie Town VLBA Characteristics • Digitize two VLBA IF’s • 0.5 to 1.0 GHz pass bands • Mark5 interface • Designed for VLBA/Mark4 correlators • Analog IF fiber connection (VLA to Pie town) • 100 Km single hop • Bi-direction communication • Pass four 50MHz wide Channels Haystack - NRAO Collaboration

  4. Haystack - NRAO Collaboration

  5. Pie Town eVLBA LinkDesign Goals • Replace BBC’s, samplers, and formatter with a DBE • Mark5 recorders required • Must be WIDAR compatible • Must be VSI-H compatible • Operational by 2008 (not 2009) Haystack - NRAO Collaboration

  6. VLBA Pie Town eVLBIRoad Map • First test – VLA to Haystack (May 07) • 32 Megabits data rate • $5K phone bill • Digital link from Pie town to VLA (2008) • Requires DBE, OC192 or Ethernet • de-Formatter and WIDAR compatible • eVLBI from Pie Town to Haystack • Requires Ethernet format Haystack - NRAO Collaboration

  7. VLA - MIT Haystack Link Haystack - NRAO Collaboration

  8. Internet2 Route Haystack - NRAO Collaboration

  9. eVLBI with NRAO Data • EVLA Data • Use the WIDAR correlator output • VSI to Ethernet converter (Mark5) • GBT Data? • VLBA Data • Last mile problem • Pie Town only Haystack - NRAO Collaboration

  10. DBE Block DiagramVersion I-3 V1 Haystack - NRAO Collaboration

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