The VLBA GigaBit-per-second data recording system

Astronomy and Astrophysics – Astronomy

Scientific paper

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Scientific paper

The VLBA Data Recording System was designed to support a peak aggregate data rate of 512 Megabits per second initially, and be expandable to peak aggregate rates of 1024 Megabits per second (``1 Gbps''). Budgetary constraints prevented even the planned initial capability from being completed as part of the VLBA construction project, and it is only now nearing completion. In the meantime, while the VLBA was being completed, Haystack Observatory developed and partially implemented the design of the Mark 4 recording system, a further development beyond the Mark 3A system upon which the VLBA system design was based. Mark 4 can record at aggregate data rates up to 1 Gbps. To maintain the VLBA's competitiveness in terms of sensitivity, and in particular to be ready for the ARISE Space VLBI mission's wideband data downlink, it is time now to exercise the expansion option designed into the VLBA Data Recording System. This paper describes current plans within NRAO for such a development. Besides the Gbps implementation originally foreseen for the VLBA Data Recording System, development of the Mark 4 system has made possible as alternative implementation. The relative merits of these two implementations are discussed.

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