Experiences Supporting By-Request Circuit-Switched T3 Networks (RFC1306)
Original Publication Date: 1992-Mar-01
Included in the Prior Art Database: 2000-Sep-12
Internet Society Requests For Comment (RFCs)
A. Nicholson: AUTHOR [+2]
This memo describes the experiences of a project team at Cray Research, Inc., in implementing support for circuit-switched T3 services. While the issues discussed may not be directly relevant to the research problems of the Internet, they may be interesting to a number of researchers and implementers.
Network Working Group A. Nicholson
Request for Comments: 1306 J. Young
Cray Research, Inc.
Experiences Supporting By-Request Circuit-Switched T3 Networks
Status of this Memo
This RFC provides information for the Internet community. It does
not specify an Internet standard. Distribution of this memo is
This memo describes the experiences of a project team at Cray
Research, Inc., in implementing support for circuit-switched T3
services. While the issues discussed may not be directly relevant to
the research problems of the Internet, they may be interesting to a
number of researchers and implementers.
Developers at Cray Research, Inc. were presented with an opportunity
to use a circuit-switched T3 network for wide area networking. They
devised an architectural model for using this new resource. This
involves activating the circuit-switched connection when an
application program engages in a bulk data transfer, and releasing
the connection when the transfer is complete.
Three software implementations for this feature have been tested, and
the results documented here. A variety of issues are involved, and
further research is necessary. Network users are beginning to
recognize the value of this service, and are planning to make use of
by-request circuit-switched networks. A standard method of access
will be needed to ensure interoperability among vendors of circuit-
switched network support products.
The authors thank the T3 project team and other members of the
Networking Group at Cray Research, Inc., for their efforts: Wayne
Roiger, Gary Klesk, Joe Golio, John Renwick, Dave Borman and Craig
Users of wide-area networks often must make a compromise between low
cost and high speed when accessing long haul connections. The high
money cost of dedicated high speed connections makes them
uneconomical for scientists and engineers with limited budgets. For
many traditional applications this has not been a problem. Datasets
can be maintained on the remote computer and results were presented
in a text-only form where a low-speed connection would suffice.
However, for visualization and other data transfer intensive
applications, this limitation can severely impact the usability of
high performance computing tools which are available only through
long-haul network connections.
Supercomputers are one such high performance tool. Many users who
can benefit from access to supercomputers are limited by slow network
connections to a centrally located supercomputer. A solution to this
problem is to use a circuit-switched network to provide high speed
network connectivity at a reduced cost by allocating the network only
when it ...