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Unformatted text preview: 618 WDM Network Design Summary We studied the design of wavelength-routing networks in this chapter. We saw that there is a clear benefit to building wavelength-routing networks, as opposed to simple point-to-point WDM links. The main benefit is that traffic that is not to be terminated within a node can be passed through by the node, resulting in significant savings in higher-layer terminating equipment. The design of these networks is more complicated than the design of traditional networks. It includes the design of the higher-layer topology (IP or SONET), which is the lightpath topology design problem, and its realization in the optical layer, which is the routing and wavelength assignment problem. These problems may need to be solved in conjunction if the carrier provides IP or SONET VTs over its own optical infrastructure. However, this is difficult to do, and a practical approach may be to iteratively solve these problems....
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- Spring '09