MASSACHUSETTS INSTITUTE OF TECHNOLOGY
HAYSTACK OBSERVATORY
WESTFORD, MASSACHUSETTS 01886
Telephone:
Fax:
978-692-4764
781-981-0590
23 October 2002
TO:
Distribution
FROM:
Alan R. Whitney
SUBJECT:
23 October 2002 e-VLBI telecon summary
Attendees:
Lee Foster, Paul Lang – GSFC
Tom Lehman - ISI
Steve Bernstein, Peter Schultz – MIT Lincoln Labs
Kevin Dudevoir, Hans Hinteregger, Arthur Niell, Mike Titus, Alan Whitney – Haystack Observatory
This telecon is one of an ongoing series of telecons to prepare for gigabit/sec e-VLBI demonstrations
between NASA GSFC and MIT Haystack Observatory using a combination of network facilities
including all or part of Glownet, Bossnet, ISI-E, SuperNet, Max and GSFC/HECN.
ACTION ITEMS ARE HIGHLIGHTED IN RED.
Status Reports
The attached figures of the e-VLBI path have been updated to reflect current status and are pretty
much self-explanatory. The following status updates were reported:
− Peter reported that Bossnet remains operational in GigE mode. Service may be upgraded
again to OC-48 when the new Qwest fiber is in place from ISI-E to Eckington (where Bossnet
connects).
− Tom reported that the ISI-E/Eckington link may go down anytime starting tomorrow morning
(24 Oct) as Verizon discontinues service. Qwest has the contract for the replacement fiber,
but Tom is not certain when that will be in place; it could be up to few weeks!
− On 15 Oct 02 the world’s first (we believe) successful international e-VLBI experiment was
conducted between Kashima, Japan and Haystack Observatory. At Haystack the data were
recorded on the Mark 5 system and at Kashima data were recorded on the Japanese K5
system. Data were transmitted via Abilene and GEMnet (across Pacific Ocean). The
observed data rate was ~1.6Mbps, considerably lower than the 20 Mbps expected; the cause is
being investigated. Data were sent in both directions and correlated at both Kashima and
Haystack. The results were nominal. We plan to continue a low level of experimental
activity with e-VLBI to Japan.
minutes20.doc 10/24/2002
1
− Alan reported that USNO plans to lease a dark fiber from GWU to USNO are moving along.
Everything is ready to go as soon as agreement with MAX is reached on usage fees.
Hopefully this issue will be settled in the near future so that things can move ahead
− Plans for a connection from Kauaii, Hawaii to Haystack, as discussed at the last e-VLBI
telecon, are still moving forward, but slowly.
Next e-VLBI experiment
The next e-VLBI experiment to attempt a direct data transfer from GGAO to Haystack was originally
scheduled for later this week or early next. But, as a result of the imminent downtime on the link
from GGAO to Haystack, as well as scheduled downtime on the GGAO antenna starting within a few
days and lasting up to a month, a decision was made to try to do a quick experiment on Thursday
morning (24 Oct). This will require some scrambling in order to get everything in place. [Postnote: It
worked! The experiment was successfully conducted just two hours before Verizon pulled the plug
on the network!]
Report Outline
After some discussion, the outline was modified to add ‘Westford connection’ as follows:
Executive Summary - Alan
Introduction - Alan
What is VLBI? - Alan
Why e-VLBI? - Alan
Goals of the 1-Gbps e-VLBI Demonstration - Alan
Elements of the 1-Gbps Demonstration
Mark 5 VLBI Data System – Alan
Westford connection - Alan
Glownet/Bossnet – Steve/Lorraine/Peter
ISI-E/Max – Tom/Jerry
GSFC Networks – Pat/Bill F./Paul/Kevin K./Dan
Haystack/GGAO – Kevin D./Alan/Bill W.
Testing and Performance – Tom/Bill F./Kevin K./Kevin D.
Results of e-VLBI Demonstration – Alan
Recommendations for further work/Future Directions in e-VLBI - All
Summary - Alan
Goal is to have first draft by end Nov 2002 and final report ready to submit for publication by end
Dec 2002. To be included as well: network diagrams, performance graphs, and e-VLBI results.
Everyone is asked to distribute draft material for comment; Alan will act as editor and prodder. We
expect final report will be 10-15 pages in length.
Next telecon
Next telecon is scheduled for Wed, 20 November 2002 at 2 pm EDT.
minutes20.doc 10/24/2002
2
xc:
Steve Bernstein, LL
Jim Calvin, LL
Lorraine Prior, LL
Leslie Weiner, LL
Herbert Durbeck, GSFC
Bill Fink, GSFC
Lee Foster, GSFC
Pat Gary, GSFC
Chuck Kodak, GSFC
Kevin Kranacs, GSFC
Paul Lang, GSFC
Aruna Muppalla, GSFC
Bill Wildes, GSFC
Dan Magorian, UMCP
Tom Lehman, ISI
Jerry Sobieski, Max
Richard Crowley, Haystack
Kevin Dudevoir, Haystack
Hans Hinteregger, Haystack
Arthur Niell, Haystack
Joe Salah, Haystack
minutes20.doc 10/24/2002
3
Req’d during data acq
A0
Mk5 Cntl
Cmptr
A1
Westford Antenna
Millstone RPE Bldg (Lorraine)
Mark 5
A2
SX
1
Summit
1i
GigE
SX
Westford
LAN
Mark 5
Dedicated no scheduling
A2A
Alpine
A4
3804
Haystack Correlator
Internet
B1
Haystack
LAN
Mark 5
SX
28-1A
B2
GigE
B5
B2A
14
SX 28-1A
RJ-45
13
2
B4A
1
Mark 5
B3A Mark 5
LL
C2
Dedicated no scheduling
B1A
Corr
Cntl
Cmptr
(Shared with LL on
scheduled basis)
C3
16
Summit
WDM
GigE
5i
15
B6
Cisco
1500
GigE
RJ-45
B11
B3
Test
WS
Req’d during data processing
B4
Congress St
Boston
(~50 km)
Amp
D3
WDM
E6
E3
GigE
E2
E4A
Test
WS
GlowNet
Alpine
3804
E4
GigE
Test
WS
Bossnet (Peter/Steve)
ISI-E
Scheduling on
Bossnet calendar
GigE
Juniper
M20
1310
E7
E8
GigE
E5
(~100 km)
D1
Shared with MIT traffic
Cisco
1500
E1
D2
Lincoln Lab (Lorraine/Steve/Jim)
Schedule to be
coordinated with LL
3l (2 GigE + 1 OC-48)
Dell Poweredge 2500
(’evlibhay’)
GlowNet
E5A
GigE
8
A3
A1A
Schedule to be
coordinated with LL
C1
MIT
Campus
WDM
F1
E9
Other users (no control)
To be upgraded to OC-48
155x
Amp
Amp
F2
Bossnet currently running GigE
pending investigation and repair
(’superglide’)
(’evlbill’)
From ISI-E
Dell Poweredge 500SC
(provided by Haystack)
Figure 1: e-VLBI Path - Haystack to ISI-E
evlbi011.cdr
02 Oct 02
ISI-E (Tom)
Test
WS
Scheduling on
Bossnet calendar
Test
WS
G5
G7B
G2
GE
G6B
(’kame’)
G8
OC-48
WDM
G6
Summit
5i
(’omega’)
Tuner
Bossnet
GE
G7
MAX @ ISI-E (Jerry)
G6C
G1
OC-48
Switch
GigE
G3
H5
H2
GigE
H4
G11
OC-48
Borrowed OC-48
interface - may not
be able to keep
H3
Juniper
M160
DREN
GigE
H8
GigE
H9
Primary e-VLBI path
J3
Test
WS?
J2
Other users ( no control)
Cisco
4912
Switch
GigE
Summit
5i
H10
GigE
J4
J5
WDM
GigE
on loan from GSFC
H11
2 GigE l’s
LuxN
J6
J1
Need details
Needs configuration
H6
MAX/UMCP (Jerry/Dan)
No jumbo frames
No scheduling;
sufficient capacity
for e-VLBI
OC-48
Juniper
M160
Frame relay encapsulation
G10
H7
MAX performance node;
need details
Test
WS?
Backup plan
Juniper
M40
G9
H1
G12
GigE
GigE
Trans-
ponder
Summit
5i
G4
LX (~14km)
GSFC/Bldg 28 (Pat/Paul/Kevin/Bill F.)
K4
K1
WDM
GigE
K2
GigE LX (~7.25km)
1310
K7
Summit
5i
K3
K5A
K5
G4 Mac with
Yellowdog Linux
(’clifford’)
GGAO/Bldg 201 (Pat/Chuck)
Test
WS
Test
WS
K6
K6A
K5B
Cisco
12016
K6B
GGAO Antenna Trailer (Bill W./Chuck)
GigE Summit L3
GigE
L1
5i
L5
G4 Mac
(’pluto’)
Windows PC
(’xly’)
RJ-45
Test
WS
Internet
L4
L2
Dedicated - no
scheduling necessary
(~500m)
RJ-45
Mark 5
NASA
LAN
L3A
RJ-45
L4A
Mark 5
L6
Mark 5
Cntl
Cmptr
L5
Req’d during data acq
evlbi012.cdr
Figure 2: e-VLBI Path - ISI-E to GSFC/GGAO
02 Oct 02