Arecibo e-VLBI:
Networking Progress and Plans
Arun Venkataraman
NAIC/Arecibo Observatory
Current Network Architecture
GE Dark Fibre by Centennial
OC-48 UPR / Centennial
Jardín Botánico
UPR GSR
Villa Nevarez
HPCF 6513
ATM Backbone
Internet 2
Internet 1
Guaynabo
Angora
RUM
UPRU
HPFC ATM UNI Network
UPR ATM UNI Network
RCM
UPRH
UPRA
UPR RP
Cornell AO
UPRP
Cayey
UPRC
Centennial de Puerto Rico
UPR / HPCF ATM Project
SIZE
FSCM NO
DRAWN
OC-12
OC-3
DS-3
ISSUED
UPRAG
15-mar-2005
SCALE
n/a
UPRB
DWG NO
REV
UPR-HPFC0503
A
SHEET
1 OF 1
First eVLBI with JIVE: September
2004
The first eVLBI test observations took
place on Sept. 10, 2004. The source,
0528+134, was observed at 1.6 GHz using
an array consisting of Arecibo,
Cambridge (UK), Torun (Poland) and
Westerbork (Netherlands).
The observations resulted in the FIRST
transatlantic eVLBI image. Arecibo-Torun
was then the LONGEST real-time
interferometer baseline yet created.
(Top) The 1.6-GHz continuum image of
0528+134 at 80 mas resolution.
(Below) Visibility amplitude and phase
plots between Arecibo and other EVN
stations.
Data Path to JIVE
MK5
in2net
DAR/Formatter
¾PRISANET
¾AMPATH
¾Abilene
(US) of Florida Intl. Univ.
(US) of Internet 2.
¾SURFnet
JIVE
(PR) of the Arecibo Obs./UPR.
(NL) of SURFnet BV.
Data rate: 32 Mbps,
briefly sustained 80 Mbps.
Introduction to EXPReS
EXPReS Partners
19 partners, 21 telescopes, 6 continents, 7500 km longest baseline
UDP Test 10/25-6/07
GigE Solution into FIU @ Miami NAP
HPCF
GigE/EOS
UPR
Guaynabo
Internet2
FIU
Miami NAP
Centennial MPLS
Internet
Arecibo
AO
GigE
The interim solution
• “Non-peak” rate-limit to155Mbps
• “Peak” (12am-6am) rate-limit to 512Mbps
– Divert commodity Internet b/w to Internet2
– Notify UPR and Centennial in advance
– UPR reserve rate-limit to 60Mbps
• FIU (AMPATH) interface upgraded to GigE
• Possible connectivity via A-Wave/NLR
– Bypasses Abilene