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VSI-E Status

Learn about the VSI-E Overview, Trial, e-Merlin project, and Next Steps presented at the U.S. VLBI Technical Coordination Meeting in Socorro, NM. VSI-E aims to establish a media-independent data format compatible with heterogeneous systems for efficient real-time transport using RTP and RTCP protocols.

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VSI-E Status

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  1. VSI-E Status Chester Ruszczyk / Alan Whitney MIT Haystack U.S VLBI Technical Coordination Meeting, Socorro NM

  2. Agenda • VSI-E Overview • VSI-E Trial • e-Merlin • Next Steps U.S VLBI Technical Coordination Meeting, Socorro NM

  3. VSI-E Overview • VSI-E primary objective • A media independent data format • Transmitted “on the wire” • from source to destination • DIM to DOM • Is compatible between heterogeneous DTSs • VSI-E Proposal extends • Real-time Transport Protocol (RTP) / RTP Control Protocol (RTCP) • Proposed as the basis for the VSI-E Standard • IETF Standards RFC3550, RFC3551, RFC3605 U.S VLBI Technical Coordination Meeting, Socorro NM

  4. VSI Model U.S VLBI Technical Coordination Meeting, Socorro NM

  5. VSI-E Trial • Non-real time transfer from • NyAlesund to Haystack • UDP Protocol • Rate Controlled at 100Mbps • UDP based protocols • vfer / UDT • Integrating functionality with EGAE software. U.S VLBI Technical Coordination Meeting, Socorro NM

  6. e-Merlin • As part of the express project • Goal is 4 Gbps • Over dedicated light paths • Use 4 iBoBs • 1 Gbps • Output is VSI-E Format • Over UDP protocol • Implemented UDP / IP protocol stack (~10% FPGA Fabric) • Using vtp libraries to test out functionality • To transfer data to Mark5B+ U.S VLBI Technical Coordination Meeting, Socorro NM

  7. Next Steps • Have the community ratify the specification • Ensure that work done for VSI-G (Gigabit layer 2 data format) • Extends easily to VSI-E • Extend VSI-E to handle corner turning format. • The VSI-H specification • Data rates of 2n Mbps to be selected by the DIM and DOM • Without effecting VSI-H standard. U.S VLBI Technical Coordination Meeting, Socorro NM

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