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Issue
49 - September 2006
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Optical
HARNET: The next generation networking technology
By
C Y Kwok
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It
is the first time in years the local universities are able
to lease dark fibers from a local carrier for setting up the
Optical HARNET, an experimental optical network linking up
all the HARNET member institutions for collaborative research
and academic activities which require high network bandwidth.
The optical network was installed and became operational in
late August 2006. Previously, dark fibers of the local carriers
had been either virtually unavailable or unaffordable to their
customers. Currently, most major R&E (Research and Educational)
networks worldwide are built using optical circuits based
on a mix of TDM (Time-division Multiplexing) and DWDM (Dense
Wavelength Division Multiplexing) technologies. With the new
Optical network, HARNET is catching up with its counterparts
in the Asian Pacific region such as the R&E networks in
Mainland China, Taiwan, Japan, Korean and Singapore.
The Optical
HARNET will run in parallel with the existing HARNET (which
is based on GE circuits provisioned by using the Metro Ethernet
service of a local service provider) and will eventually replace
it. HARNET member institutions intend to make use of this
advanced next generation networking technology for:
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Providing on-demand high speed network connections to support
research and educational applications including Grid computing,
multimedia applications, high-resolution videoconferencing,
telemedicine applications and network infrastructure research,
etc.
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Supporting inter-institutional collaboration projects like
disaster recovery site using remote SAN technology
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Connecting to other advanced international R&E optical
networks
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Testing native IPv6 and other next generation network technologies
The Optical
HARNET consists of 8 nodes, one for each HARNET member. Initially
each node is equipped with two GE ports and one 2G Fiber Channel
port. One of the GE ports is used to interconnect the HARNET
members and the Internet2, while the other GE port and the
Fiber Channel port can be used for inter-institutional collaborative
projects. The three ports are sharing the same 10G ring using
TDM technology. Additional 10G rings can be provisioned by
adding a lambda (wavelength) over the same fiber ring using
DWDM technology, and a maximum of 72 lambdas can be supported
over the same fiber ring. At the moment, DWDM has not been
deployed, but another 10G fiber ring is used to connect 4
of the 8 nodes, forming a 4-node inner ring inside the 8-node
outer ring. As each 10G ring has an effective bandwidth of
5G due to the fact that half of the bandwidth is reserved
for ring protection, the total available bandwidth is 10G
for the Optical HARNET. DWDM can be enabled whenever additional
bandwidth is required with very little extra cost. As such,
unlimited network bandwidth can be made available to HARNET
on demand.
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