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Enhancing VLBA Connectivity: Pie Town eVLBI Collaboration Roadmap

Explore collaboration opportunities and implement eVLBI connection between Haystack and Pie Town, enhancing VLBA's capabilities through increased bandwidth and upgraded equipment. The project aims to replace BBCs, samplers, and formatters with a DBE, ensuring compatibility with WIDAR and VSI-H standards for operational efficiency by 2008.

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Enhancing VLBA Connectivity: Pie Town eVLBI Collaboration Roadmap

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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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