E-VLBI Progress with the LBA Chris Phillips, eVLBI Project Scientist November 2011.

E-VLBI Progress with the LBA

Chris Phillips, eVLBI Project Scientist

November 2011

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The LBA

ASKAP

Ceduna

ATCA

Parkes

Mopra

Warkworth

Hobart

TidbinbillaYarragadee

Katherine

Existing AARNet DWDM Network

R+E DWDM Network (Under Installation)

Future R+E DWDM Network

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ASKAP

Ceduna

ATCA

Parkes

Mopra

AUT

Hobart

Tidbinbilla

Network Links

Mount Pleasant (University of Tasmania)

•10 Gbps connection across Bass Strait• Wavelength, not fibre

•Upgraded Mark5a and tested with eVLBI•Tested Mark5B+ for eVLBI compatibility

• University infrastructure does not support jumbo frames, jive5ab (at time of testing) required them

CSIRO. eVLBI Oz 2011

Warkworth

•See Tim’s talk next•1 Gbps link NZ to Australia•eVLBI with DBBC/Mark5b achieved easily in February 2011 @ 512 Mbps


Hartebeesthoek

•First eVLBI test run to LBA on 25 November 2010• Using Mark5a hardware

• Immediate fringes @ 512 Mbps


KVN

•KVN-LBA tests planned for the next few weeks


e-Transport

•All stations except Ceduna using e-Transport of data to a 3rd party data store• Tidbinbilla USB disk shuffle• Using grid-FTP, no certificates

•Most sessions no disk swapping• ATCA 36 TB disk array• Parkes 48 TB disk array

•Typically 100 TB/session•Typically no faster than mail

• Kinder to disks• Lower overhead to staff


Parkes Data Store

•100% COTS solution•4 U chassis with 24 2 TB SATA disks

• SuperMicro

•Adaptec hardware RAID card

•ATCA Sun “Thumper”• 28x750 GB


RAID0 5.5 Gbps

RAID5 5.2 Gbps

RAID6 4.1 Gbps

ASKAP VLBI backend

•ASKAP VLBI backend developed at Curtin by PhD student Bruce Stansby

•Based on Signatec PX14400 sampler card• PCI-E x8 card• Dual channel 400 Mbps/14 bit (200 MHz bw)• Lab test dual pol 128 MHz

•Deployed as 64 MHz dual• 4 Gbps recording onto

COTS RAID0


ASKAP eVLBI

• Software conversion to 2 bit with AGC• Requires a few dedicated cores

• Write to network or disk• Short term total power for free

• 4 msec minimum integration time• 10s usec possible easily

• Flexible design• Modified code to realtime spectrometer

• Formats data as LBADR, Mark5B or VDIF• Still limited to 64 MHz bandwidth

• First fringes 27 June 2011 • 128 MHz dual pol should work fineCSIRO. eVLBI Oz 2011

ATCA image by L Godfrey (Curtin University)

PKS0637-752

Banff SKA Forum e-VLBI demonstration

•Live eVLBI demonstrated during Minister for Science press conference

CSIRO. The high resolution component of ASKAP

DIFX2.0 – Zoom Bands

•DIFX Zoom Bands allows correlation of different bandwidth without resampling• Particular importance with ASKAP with inflexible

sampling system

•Use in fringe test in June 2011• 1x64 MHz at Mopra, 3x16 MHz at other stations• 2x8 MHz zoom bands correlated


AARNet 40 Gbps trials

•AARNet using CSIRO links to telescopes to test roll out of CISCO 40 Gbps technology

•Parkes to ATCA, via Sydney • Deliberately long to showcase technology

•Only requires upgrade of endpoint equipment, long haul infrastructure remains (optical amplifiers etc)

•Current fibres support 80 wavelengths for a total of 3.2Tbps• 8 Tbps using 100 Gbps technology


Contact UsPhone: 1300 363 400 or +61 3 9545 2176

Email: [email protected] Web: www.csiro.au

Thank you

Astronomy and Space ScienceChris Phillipse-VLBI Project Scientist

Phone: 02 93724608Email: [email protected]: www.atnf.csiro.au

E-VLBI Progress with the LBA Chris Phillips, eVLBI Project Scientist November 2011.

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