Argonne National Laboratory high-performance network support of APS experiments Page: 1 of 4
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Argonne National Laboratory high-performance network support of
M. J. Knott
Accelerator Systems Division. Argonne National Laboratory. 9700 South Cass Avenue, Argonne,
R. J. McMahon
Electronics and Computing Technologies Division, Argonne National Laboratory 9700 South Cass
Avenue, Argonne, Illinois 60439
(Presented October 19, 1995)
Argonne National Laboratory is currently positioned to provide access to high-performance
regional and national networks. Much of the impetus for this effort is the anticipated needs
of the upcoming experimental program at the APS. Some APS Collaborative Access
Teams (CATs) are already pressing for network speed improvements and security
enhancements. Requirements range from the need for high data rate, secure transmission of
experimental data to the desire to establish a "virtual experimental environment" at their
home institution. In the near future, 155 Megabit/sec (Mb/s) national and regional
asynchronous transfer mode (ATM) networks will be operational and available to APS
users. Full-video teleconferencing, virtual presence operation of experiments, and high-
speed, secure transmission of data are being tested, and in some cases, will be operational.
We expect these efforts to enable a substantial improvement in the speed of processing
experimental results as well as an increase in convenience to the APS experimentalist.
@1995 American Institute of Physics.
I. INTRODUCTION-THE DATA EXPLOSION
The Advanced Photon Source (APS) will enable
scientists to study more complex systems, faster
reactions and processes, and to gather data at a
greater rate and level, of detail than has been
possible to date. Each of these factors has the
independent potential of increasing by a large
degree the amount of experimental data collected.
This data could be stored at the experiment site or in
an APS or Argonne data storage facility, or it could
be stored on optical disks and transported to the
scientist's home institution for storage and use.
However, the continuing growth and increasing
speed of regional and national networks will make
possible the quick relocation of the data and will
open possibilities for rapid interaction of the
expose/analyze/modify/expose cycle for certain
types of experiments.
In addition, as more and faster data networks
become available, other uses of these networks, not
normally thought of, will become realizable and
even attractive for the APS experimentalists.
Network-based teleconferencing, remote monitoring
and control of some portion of the experiment itself,
and even educational experiences based on display
of the data from a running experiment will all be
within the realm of possibility.
0 1 T
II. APS NETWORK INFRASTRUCTURE
To provide for adequate security, initial
bandwidth and bandwidth growth, and user-to-user
separation, the APS is installing a network
infrastructure based initially on FDDI (100 Mb/s)
service to each lab office module (LOM). Each user
group, known as a Collaborative Access Team
(CAT) can receive Ethernet (10 Mb/s) of, FDDI
service from the router and hubs located in each
LOM. An average of three network subnets per
sector can be provided with the APS Class-B license
to allow for address separation between CATs and .
Figure I shows the APS FDDI network as a ring
network. It is physically a "collapsed ring" and will
allow an upgrade to switched FDDI in the future to
gain higher aggregate data throughput. Dark fibers
are available for special CAT needs. Also shown in
Figure 1 is an asynchronous transfer mode (ATM)
switch connected to all LOMs. This switch will be
utilized by those CATs which require very high data
transfer rates -- initially up to 622 Mb/s. The ATM
protocol allows data, voice, and video to be
intermixed while providing priority and "class-of-
service" to be maintained.
DISTRIBUTION OF THIS DOCUMENT IS UN1JlTl'
The submitted manuscript has been authored
by a contractor of the U. S. Government
under contract No. W-31-109.ENG-38.
- Accordingly, the U. S. Government retains a
nonexclusive, royalty-free license to publish
r or reproduce the pu~blishled form of this
contribution, or allow others to do so, for
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Knott, M.J. & McMahon, R.J. Argonne National Laboratory high-performance network support of APS experiments, article, December 31, 1995; Illinois. (digital.library.unt.edu/ark:/67531/metadc666551/m1/1/: accessed March 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.