Abstract
Communication networks are often partitioned into tiers to provide a
convenient framework for their optimization, graceful growth, and evolution. We
extend the application of the Network Global Expectation model, which we have
recently described, by considering a two-tier architecture for a communication
network and analyzing the corresponding network requirements and costs using
expectation values evaluated over the entire network. We also explicitly treat
nonuniform traffic in the form of population-dependent demand. The capability of the
model is illustrated by demonstrating scenarios for which the two-tier architecture
may be used to reduce the cost of an optical fiber backbone network relative to a
single-tier solution.
© 2004 Optical Society of America
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