15 in contrast with a large nonblocking switch we

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in Figure 7.15. In contrast, with a large nonblocking switch, we would simply connect the T terminations to T ports of this switch, resulting in a (WF + T ) × (WF + T ) switch overall. This situation somewhat reduces the appeal of a wavelength plane approach. To summarize, the wavelength plane approach needs to take into account the number of fibers, fraction of add/drop traffic, number of terminations, and their tun- ing capabilities as separate parameters in the design. With a large-scale switch, we can partition the ports in a flexible way to account for variations in all these param- eters; the only constraint is in the total number of ports available. See Problem 7.7 for another example of these types of trade-offs. Summary We studied the basic network elements constituting WDM networks in this chap- ter. We refer the reader back to Chapter 3 to get an understanding of the various technologies that are used to build these elements. The WDM network provides circuit-switched lightpaths that can have varying degrees of transparency associated with them. Wavelengths can be reused in the
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