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General Project Description As networks evolve to support more
bandwidth-intensive applications, and as rich multimedia and real-time services
become more popular, next generation networks are expected to support traffic
that will be heterogeneous in nature with both unicast and multicast
applications (e.g., software and video distribution, distributed computing,
etc.). There are also several
potential applications for groupcasts in optical networks, where optical
multipoint-to-multipoint sessions are set-up in wavelength-routed networks.
Many applications that require groupcast are widely deployed, such as
grid-computing, multi-party teleconferencing, distributed interactive
simulations, virtual private network (VPN) services and Ethernet LAN (E-LAN)
services to name a few. As wavelength-routed networks are deployed in great
numbers to meet scalability and bandwidth requirements in next-generation
networks, groupcast will be even more commonly utilized in optical networks
to serve multipoint-to-multipoint bandwidth intensive sessions.
Survivability, together with fault protection and restoration, is critical
for high-bandwidth optical networks. More traffic is concentrated on fewer
routes, increasing the number of customers that can be potentially affected
by a failure. In these networks it is essential to have
backup mechanisms to prevent the loss of information due to fiber cuts or
equipment failures, which may occur often enough to cause major service
disruptions. This loss could be even more crucial in the case of the
multicast traffic where a link in a �light-tree� carries traffic to multiple
destinations. In this project we will investigate the
problems of routing, grooming, and survivability for transparent optical
networks that support unicast, multicast, as well as groupcast applications.
In these transparent networks, where the signal stays in the optical domain
for the entire path, efficient routing and wavelength assignment of multicast
and groupcast connections becomes extremely important especially in light of
the multiple splits that the signal undergoes and the physical layer
impairments (crosstalk, dispersion, etc) that the optical signal� encounters. In the design of the algorithms
the physical layer impairments will be taken into consideration during the
provisioning of each application. The algorithms designed will be
incorporated in a software simulation tool that can be utilized by network
designers and researchers to design and evaluate the performance of
metropolitan optical networks when such applications are present. In this
way, more efficient networks can be deployed, thus lowering the cost of the
network operation and the cost of the services offered to the clients of the
telecommunications carriers and service providers. |
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