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VLBI News

Tapasi Ghosh

The 3rd US VLBI Technical Group meeting took place at Arecibo on 29th
and 30th of November, 2007. Participants attended from NRAO/VLBA,
MIT/Haystack Observatory, and NAIC/Arecibo Observatory. They discussed
various aspects of on-going technical developments of relevance to
VLBI observations. The goal of these meetings is to promote coordinated
efforts toward producing next-generation VLBI data-acquisition systems,
recorders and correlators to be used in both astronomical and geodetic
studies during the decade following 2010.

Prior to this meeting, on 26th October, in the on-going effort toward
improving data connectivity to VLBI correlators, a test run was successful
in sending VLBI formatted data from Arecibo to the JIVE correlator in the
Netherlands at a sustained rate of 105 Mbps (Fig ...). This was achieved
over the existing 155-Mbps OC3 connection that is shared with three
campuses of the University of Puerto Rico (UPR). This success was made
possible by software developments undertaken at JIVE by EVN scientists and
engineers. Arecibo's connection to the Internet2 backbone, shared with
the UPR, will be upgraded to use gigabit ethernet. This will increase
the bandwidth for the steady connectivity to a rate of about 200 megabits/s,
and with rates of up to 512 megabits/s on demand during the low traffic
periods for special-purpose uses. A memorandum of understanding is due to
be signed with the UPR which will guarantee AO the use of this high-speed
link at its maximum data rates during future eVLBI experiments.