mpg/mpifr effelsberg – bonn fibre project and e-vlbi
Post on 22-Nov-2021
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German LOFAR stations
● 2 Gbit/s output data rate● 3 x 1 GbE needed per
station● Data of all LOFAR
stations to be routed through Jülich research centre
● At Jülich possible local correlation
● Jülich fibre to Aachen● Routed to Groningen ●
Effelsberg fibre project
● Proposed for eVLBI to Max Planck Society– Enabled 1st German LOFAR station at Effelsberg
● Financed 100% by MPG (some EU support)● Planning MPG, MPIfR, Faaron GmbH● Team at MPI:
– Dr. A. Oberreuter (computer division, project leader)
– Dr. W. Alef (VLBI technical department)
– Dr. W. Reich (LOFAR project manager)
– G. Bilski (administration)
Effelsberg fibre project● Estimated and planned cost 2 M€● Actual cost ~ 1 M€● Planning phase: 2006● Construction: 2007● Phase1: Effelsberg to MPIfR Bonn
finish according plan: 17.10.2007● Phase2: MPIfR to Bonn University (DFN POP)
end of November 2007● Operational: early 2008
Fibre usage
● E-VLBI transfer from Effelsberg to Bonn and Dwingeloo
● LOFAR transfer to Groningen● Store backup at Effelsberg (2nd site)● Effelsberg part of MPIfR LAN● Stream data from telescope into cluster at Bonn
for direct analysis (e.g. pulsars)
E-VLBI at Bonn● At present 1 GbE from MPI to Géant (Frankfurt)● Doing regular file transfers between geodetic
antennas and the MPI correlator(see C. Dulfer's talk)
● UT1 near real-time correlation● Some Mark 5 units have been upgraded with
new mainboards (2 x 1 GbE on board)● Effelsberg has Mark 5A&B unit with new server
mainboard
Planned E-VLBI at Bonn● 2 x 10 GbE lines plus a couple of 1 GbE
between MPI Bonn – Effelsberg ● 10 GbE or 4 x 1 GbE MPI Bonn to Groningen
for LOFAR and eVLBI (via Jülich/Aachen)– Dwingeloo with 1 GbE for eVLBI
● Cost ~ 30 to 60 k€/y + possibly cost for Surfnet+ 1GbE to Géant (Frankfurt)
● No real-time eVLBI planned at Bonn correlator● Real-time from Effelsberg for LOFAR and JIVE
VLBI correlator
Problem areas
● LOFAR is being descoped → less than 2 Gbit/s ?
● RZ Jülich is delaying purchase of hardware● LOFAR wants money for transfer over Surfnet ?● DFN is building new POP at Bonn university
→ delays ?● LOFAR possible over Internet (not P2P) ?● E-VLBI to Dwingeloo should be fine via 1 GbE
to Géant, but no contract at present
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