Functions of the backbone: aggregation and transport evolution of the MSPP and MSTP concepts in .NET framework

Generation QR Code JIS X 0510 in .NET framework Functions of the backbone: aggregation and transport evolution of the MSPP and MSTP concepts
93 Functions of the backbone: aggregation and transport evolution of the MSPP and MSTP concepts
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The community network backbone, often spread across the metro access, collector and metro core areas, has two primary functions: aggregation and transport information While the optical
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network that comprises the backbone supports the function of transport quite effectively, it is the former function of data aggregation that needs critical attention in core network design The core represents an opportunistic medium, whereby multiple lower speed connections are grouped together, multiplexed onto a higher speed bandwidth pipe and transported seamlessly from one source node to another This philosophy entails the optical communication in the core to be relegated to lightpaths residing on wavelengths that have suf ciently large granularity, and further, that ingress nodes that act as sources for these lightpaths groom a large number of slower speed signals onto the lightpath The criterion for grooming is based on the source destination proximity requirement This means that at a source node S, all lower rate streams are groomed onto lightpath LSD say, with the criterion that each stream has destination D in mind This kind of system is also called single-hop grooming As opposed to single-hop grooming, we can also have multihop grooming, whereby a stream is groomed into a lightpath that is destined for some intermediate node, and further, the intermediate node has another lightpath destined for the nal destination node In that case, the intermediate node has the function of switching the lower rate stream from the ingress lightpath, to the egress lightpath, as shown in Figure 95 Note from Figure 95 that the most important element in both single and multihop systems is the digital cross connects The digital cross connect shown here is a conceptual element with various manifestations in real networks, such as STS-1 to OC N grooming (N = 3, 12, 48 or 192) or 10/100 to GigE grooming The digital cross connect has
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Single Hop Grooming of Lightpaths DIGITAL CROSS CONNECT DIGITAL CROSS CONNECT
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Figure 95 (a) Single and (b) multihop systems
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the functionality of multiplexing (grooming) slower rate signals into a faster rate signal, and thereby providing the much required high utilization of the available optical wavelength The principle behind electronic (digital) grooming is to multiplex as many slower rate signals onto one WDM channel as possible, as opposed to sending multiple slower rate signals each on a different WDM channel This is because the cost of related optics (transponders, etc) is high, though this economic issue is soon set to reverse with maturity of the technology However, despite the apparent future reversal, it can be expected that future networks will have a good blend of both digital cross connects and numerous WDM channels From the discussion above it is apparent that traf c grooming is an important aspect of network design, especially considering the cost saving achieved through it However, in real network systems, grooming has one more parameter attached to it, other than just pure traf c aggregation and TDMing namely service differentiation Individual data streams each have some service to offer and often function at different data rates Service differentiation leads to a QoS requirement change in networks For example, data services are best effort and do not need fast protection, while for voice services, anything more than 50 ms protection is unacceptable Further, we have a plethora of committed standardized transmission rates for clients to function on, such as OC-3, 12, 48, 192, Fiber channel 1, 2 and 4 G, resilient packet ring speeds, fast Ethernet and GigE/10GigE Multiplexing all of these on a common platform (if not a common card), and further demultiplexing them seamlessly at destination nodes on the same platform, has been proposed and this functional system is termed the multiservice provisioning platform, or MSPP (Figure 96) The MSPP concept provides a platform (hardware implementation) that allows multiple services to be provisioned in a network seamlessly The last word seamlessly is the key to the success of such a device and that is the essence of the function of provisioning MSPPs typically have multiple client interfaces that accept lower rate multiple service-based signals The MSPP then converts these signals into the appropriate network-side (as opposed to client-side) coarse granular signals The ne granularity of the
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