MPG/MPIfR

Effelsberg – Bonn fibre

project

and

E-VLBI Status at the MPIfR

100m radio telescope Effelsberg

VLBI correlator at the MPIfR

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

Effelsberg – Bonn fibre in NRW

Effelsberg – Bonn fibre

Digging for the fibre

Some videos

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