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The Metro Explosion
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The metro region has enjoyed a great deal of technological attention in the last 18 months because service providers have realized that this region of the network has an enormous unmet need, and the service providers, along with their manufacturer partners, have the wherewithal to address it. The metro business market relies heavily on LAN technology, largely the various flavors of Ethernet (traditional 10-Mbps, 100-Mbps Fast Ethernet, and 1,000-Mbps Gigabit Ethernet) for the transport of corporate data among workers in one or more locations. The problem they face today is the result of changing corporate work models. More and more, the concept of the single, monolithic corporate headquarters building is going away in favor of numerous smaller work locations that are located closer to the customer and closer to suburban areas where employees live, illustrated in Figure 6-13. The need to share information among the people in those locations has not changed (in fact, driven by the awareness of the strategic value of shared information and interest in knowledge management, it may actually be greater), so cost-effective solutions are needed to provide a way to transport Ethernet traffic across the metropolitan area. SONET and SDH have emerged as clear contenders for this responsibility, and manufacturers have announced Ethernet-to-SONET/SDH-to-Ethernet products that meet the demand.
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From Rings to Meshes
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Rings are wonderfully innovative network solutions, but they do have limitations. First, in spite of all the capabilities they bring to the network, they are not particularly flexible in terms of deployment. Users of them are forced to transport their traffic along the single path that the ring provides,
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Players and Futures in the SONET/SDH Game
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Figure 6-13 The metro environment.
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even if that path is a long way around from the source to the destination of the transmission. In many cases, this poses no problem, but for the many delay-sensitive applications that are emerging on the scene, such as voice over IP, interactive and distributive video, and others, the added delay can change the perceived quality of service, especially if a ring switch has occurred, that adds even more end-to-end delay. In response to this evolving perception, a new architecture has emerged on the scene. Interestingly enough, it is not a new model, but rather one that has been around for along time. Mesh architectures are suddenly enjoying great attention as the next generation of networking to inherit the crown from the pure ring. This model, shown in Figure 6-14, offers the multiple route capabilities of a dedicated network span alongside the survivable nature of a ring. The bulk of the network is clearly a collection of point-to-point facilities that provide shortest distance transport between any two end points, as illustrated by Figure 6-15. However, the collection of dotted lines clearly represents a ring, and the large number of alternate routes means that survivability is assured alongside guarantees of least-hop routing. In the real world, fiber
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Players and Futures in the SONET/SDH Game
Players and Futures in the SONET/SDH Game
Figure 6-14 A mesh network.
Figure 6-15 Logical rings in a mesh environment.
has now been deployed so extensively and universally that the ability to build mesh networks has not become a problem. The real issue with SONET and SDH as they evolve to accommodate the needs of the so-called next-generation network is this: both must be modified in some way to transport the variety of data types that have emerged
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