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The fact of the matter is that various realities are at work here that occasionally clash with one another. Within the data center, terabytes of content are stored in massive disk farms. On the WAN side, terabits of transport bandwidth are provisioned for the transport of data center content. Both of these represent significant costs, but the revenues from sold bandwidth and hosted data center content (hopefully) offset the costs. The OAN represents the solution that sits between the data center and the wide area, delivering scalable bandwidth that offers QoS, protocol agnosticism, and scalable bandwidth.
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Throughout this final section we have discussed the applications that are emerging under the domain of SONET and SDH. These applications derive from a number of technology sources including native mode ATM, frame relay, private line data circuits, virtual private networks, DWDM-dependent wavelength-based services, and various flavors of Ethernet, IP, video, and wireless. The conclusion that is inevitably reached is multifaceted and is described here. Long live packet switching. There is an undeniable evolution underway during which circuit switching s influence is waning, while that of packet switching is waxing. The reasons for this evolution include more efficient use of network resources, the capability to converge multiple services on a single network fabric, and competition. Convergence is real. Get over it. It really is happening: IP is ascending to the throne of network layer protocols and will become the anointed protocol for routing purposes. All transported services are in various stages of reinventing themselves for transport across packet-based infrastructures. QoS is the most important differentiator. It isn t bandwidth, availability, age, or fancy names. Customers buy services because the services do what they need to do period. Companies that take the extra effort to understand customer requirements and customize service offerings to address the specific needs of each client s situation will ultimately win the game. Content is the real driver. The realization that customer-to-server and data center-to-data center traffic is eclipsing the traffic generated by pointto-point connectivity highlights the fact that content rules. Whether it s interactive video, MP3 music, live sports events, BBC music, medical imag-
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ing, or some other form of content, it s the real driver behind the bandwidth explosion. SONET and SDH are here to stay for the time being. They may have been around for a while, and they may not be the most flexible and accommodating protocols available, but they are deeply embedded in the network, offer a wide array of capabilities, are remarkably forgiving, and they work. Add to that list the fact that service providers know and understand them and you will see why revenues from these technologies will continue to grow for some time to come. Optical networking is the next big hero. It s true: optical, with its virtually unlimited bandwidth, ubiquity, protocol transparency, and vendor support, is in the game for the long haul. There is nothing else on the horizon that stands a chance of unseating it in the near term. Metro is the focal point for the foreseeable future. Currently, the area of greatest growth in the optical networking domain, the metro region, has long been somewhat ignored because SDH and SONET were simply not the best protocols to use there. Today, however, given the growth that is underway in the metro world and the bridging that must inevitably occur between the metro and core/long-haul domains, metro is becoming a market segment to be paid attention to. Ethernet has escaped from the LAN and is roaming free. Once considered to be an almost hobby-like protocol, Ethernet has become the darling protocol for office interconnection and, if you believe the tales of Yipes and Telseon, an ideal IP transport across the wide area as well. Who woulda thunk it. IP just isn t ready for primetime. It s a great protocol with tremendous promise and absolutely will become the protocol of choice for mixed service networks. Until it has the ability to deliver discernible, predictable, and controllable QoS, it will be required to work hand-in-glove with a robust switching fabric. Rings are making room for meshes. Ring architectures are fine for the requirements of the metro market where they are widely deployed, but they are giving way to mesh network designs in the long-haul and core domain. We have more than enough bandwidth for now. Parkinson was right when he wrote, Work expands to occupy the time allowed for it. A corollary to his now-famous law might be, Applications will always expand to occupy the bandwidth allotted to them. Today optical channels on the bottom of the Pacific Ocean are lying idle, but that condition is purely momentary.
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