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Generate Code39 in Software Figure 7-16 The network s three functional regions.

Figure 7-16 The network s three functional regions.
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And the benefits of this architectural modification There are many, and they include the following:
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The capability to provide support for multiple services including ATM, frame relay, and MPLS-enhanced IP True, guaranteed, end-to-end, user-definable QoS, Per VC queuing, and QoS-aware routing Management control at the data link layer (layer 2) to improve the traditional operations, administration, maintenance, and provisioning (OAM&P) functions that are associated with the management of network resources Seamless network availability and flexibility through lossless switchover, automatic protection switching, and traffic management functions The capability to transport diverse services over a single, shared network infrastructure The capability to provide end-to-end, measurable QoS Support for an efficient mix of traffic types A flexible migration path with interfaces to existing DCS and SONET/SDH equipment The growth potential to deliver as-yet-unknown services
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So how would these capabilities be realized in the network The answer lies in the overall architecture of the network itself, specifically the optical core surrounded by a ring of layer 2 and 3 services. Let s first consider the layer 2 and 3 service environment as having two major segments. The first is the multiservices ATM segment. The services that can be delivered from this segment include frame relay, ATM, MPLS (standards-based MPLS), private line, voice, and DSL. Now consider the MPLS/IP segment. Services that can be offered from this segment include MPLS/IP and frame relay. What holds the two segments together is MPLS. In most cases, this is expected to be MPLS running over packets over SONET/SDH at OC48c/STM16 or OC192c/STM64. As we observed earlier in the book, two key goals are associated with the deployment of telecommunications technologies: cost reduction and the creation of additional revenue. Cost reduction can be accomplished readily with the deployment of new technology solutions, particularly in legacy data installations. Manufacturers have stepped up to this challenge by designing and manufacturing devices with characteristics that address the customer concerns that are
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frequently cited. These characteristics include the highest port density per installed chassis and multiservice support of the lowest lifecycle cost through the capability to add cards rather than change entire network elements as customer service requirements evolve. Additionally, these products take advantage of the strengths of high-speed layer 2 switching, offer a range of granular QoS levels, and provide the capability to deliver such IP-based applications as virtual private networks (VPNs), virtual routing capabilities, voice, fax, and video-over-IP, and IP Multicast. Given that investments in legacy switching infrastructures continue, there is no question that they will remain a significant part of the evolving IP-over-ATM network. The evolution that most see is a slow but steady evolution from a circuit-based architecture to one based on packet switching, with ATM providing the capability to ensure QoS and toll-quality services. In effect, ATM will replace traditional class four tandem switches. The other area of financial impact is revenue generation. New applications demand the shortest possible predictable end-to-end latency (40 microseconds), multiple priorities per installed port, and prioritized weighted fair queuing and scheduling to permit the delivery of predictable quality voice over IP (VoIP), video, and differentiated data services over an all-IP backbone. In this environment, offered applications include CBR over IP; voice, video, and virtual leased line services; guaranteed service-level agreements; enhanced services such as multicasting with multiple classes for real-time and non-real-time transport; and finally the capability to offer high degrees of network reliability and availability through the use of inservice software upgrades, circuit and device redundancy, and so on. All of these lend a degree of capability to modern data applications in the SONET and SDH realm.
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