Abstract
Survivability is one of the most important requirements in design of
communications networks, since we as a society are increasingly relying on
the Internet, and service interruptions are very costly. Unfortunately, submarine
fibre-optic networks are vulnerable to unpredictable disasters, such as earthquakes
or nuclear explosions, which pose significant large-scale threats to the submarine
cables of modern telecommunication networks.In this paper, we formulate an optimization problem on the plane to
minimize the total cable cost under the survivability constraints. We consider
at first a simple example of a network of two nodes located on two different
islands and propose a rectangular topology network to reduce the probability
that all the cables are damaged simultaneously by a single disaster. Then
we consider cases of multiple cables, rectangular with rounded corners and
rhombus network topologies. Analytical results, validated by simulations,
for the survivability of all topology cases are presented including a comparison
of the various topologies. Finally, we extend the discussion to a network
with an arbitrary number of nodes and a general geography, and to various
scenarios of different disaster and cable break probability functions. Overall,
this paper provides a methodology for discussing and solving a real world
problem.
© 2012 IEEE
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