MASSACHUSETTS INSTITUTE OF TECHNOLOGY
HAYSTACK OBSERVATORY
WESTFORD, MASSACHUSETTS 01886
Telephone:
Fax:
978-692-4764
781-981-0590
22 November 2002
TO:
Distribution
FROM:
Alan R. Whitney
SUBJECT:
20 November 2002 e-VLBI telecon summary
Attendees:
Lee Foster, Kevin Kranacs, Bill Wildes – GSFC
Tom Lehman - ISI
Lorraine Prior – MIT Lincoln Labs
Kevin Dudevoir, Hans Hinteregger, Joe Salah, 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:
− New fiber is in place and operating between ISI-E and Eckington, as Tom reported to
everyone by e-mail.
− Lorraine and Tom reported that there are still problems trying to bring Bossnet back up to
OC-48. Tom suggested that some loopback testing with Sonet gear is being planned to isolate
the problem.
− Tom reported that Abilene connection at ISI-E should be in place in a couple of weeks.
Connection will be into ISI-E Juniper M40 (G10 on diagram). Kevin will send Haystack,
Hawaii and Germany IP information to Tom in support of the Abilene connection at ISI-E.
− Alan reported that agreement has been made with MAX to connect USNO to MAX via
George Washington University and that project is moving ahead. Agreement with NASA to
support e-VLBI as a sponsored project needs to be reached.
− Alan and Hans reported that the efforts to connect Kokee Park, Kauai, Hawaii and Wettzell,
Germany to Haystack are continuing, hopefully beginning to bear fruit within the next month
or so.
− Tom reported ISI is submitting proposal to NASA CAN for further development of high-datarate real-time data over shared network in collaboration with Haystack Observatory and
minutes21.doc 11/22/2002
1
NASA. e-VLBI is a major application that would benefit from this work. The proposal is due
26 Nov 02 with decisions to be announced late Feb 03.
Direct-transfer e-VLBI experiment
Alan reported that a successful direct-transfer e-VLBLI experiment was conducted on 24 Oct, just
two hours before Verizon pulled the plug on the ISI-E to Eckington connection! Due to operational
constraints at Westford, which was involved in scheduled observations at the time, GGAO had to
piggyback onto the Westford operating at the same 256 Mbps mode. A direct real-time transfer of
data was made from GGAO to Haystack at 256 Mbps (actually, 288 Mbps with parity overhead)
where it was recorded on disk. Correlation with the Westford data produced normal fringes.
There was a lot of scrambling done on a very short fuse to make this experiment happen and much
thanks is due to everyone involved.
Report Outline
The goal for the first draft of the final report has been moved to Monday, 9 Dec 2002. Please send
your contributions to Alan, who will act as editor and prodder.
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
Next telecon
Next telecon is scheduled for Wed, 18 December 2002 at 2 pm EDT.
Bill Wildes, GSFC
xc:
Steve Bernstein, LL
Dan Magorian, UMCP
Jim Calvin, LL
Tom Lehman, ISI
Lorraine Prior, LL
Jerry Sobieski, Max
Leslie Weiner, LL
Richard Crowley, Haystack
Herbert Durbeck, GSFC
Kevin Dudevoir, Haystack
Bill Fink, GSFC
Hans Hinteregger, Haystack
Lee Foster, GSFC
Arthur Niell, Haystack
Pat Gary, GSFC
Joe Salah, Haystack
Chuck Kodak, GSFC
Kevin Kranacs, GSFC
Paul Lang, GSFC
Aruna Muppalla, GSFC
minutes21.doc 11/22/2002
2
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
G6B
ponder
OC-48
Summit
5i
G4
G6C
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
Abilene
H7
MAX performance node;
need details
Test
WS?
Backup plan
Juniper
OC-48
M40
G9
H1
G12
GigE
GigE
Trans-
G1
GE
(’kame’)
G8
OC-48
WDM
G6
Summit
5i
(’omega’)
Tuner
Bossnet
GE
G7
MAX @ ISI-E (Jerry)
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
L6
Internet
L4
L2
Dedicated - no
scheduling necessary
(~500m)
RJ-45
Mark 5
NASA
LAN
L3A
RJ-45
L4A
Mark 5
Mark 5
Cntl
Cmptr
L5
Req’d during data acq
evlbi012.cdr
Figure 2: e-VLBI Path - ISI-E to GSFC/GGAO
20 Nov 02