Traffic Grooming in Optical WDM Mesh Networks by Keyao Zhu

By Keyao Zhu

Optical-fiber applied sciences applying wavelength-division multiplexing (WDM) are at present being researched and commercially deployed to fulfill our expanding bandwidth necessities simply because, by utilizing WDM know-how, an optical fiber can aid a number of non-overlapping wavelength channels, every one of which usually operates on the facts expense of 10 Gbps or forty Gbps. besides the fact that, the bandwidth standards of purchaser connections are diversified and comparatively low, from 50 Mbps (and even decrease) to the complete bandwidth of a wavelength channel. which will successfully make the most of the community assets, a number of low-speed connections must be multiplexed onto a high-capacity wavelength channel, and so they have to be intelligently demultiplexed and switched at intermediate nodes sooner than attaining their locations. This challenge is often called site visitors grooming, that's a very vital challenge for either companies and proprietors. This booklet will trap the state-of-the-art within the layout and research of community architectures, protocols, and algorithms to enforce effective site visitors grooming in optical WDM mesh networks.

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By Keyao Zhu

Optical-fiber applied sciences applying wavelength-division multiplexing (WDM) are at present being researched and commercially deployed to fulfill our expanding bandwidth necessities simply because, by utilizing WDM know-how, an optical fiber can aid a number of non-overlapping wavelength channels, every one of which usually operates on the facts expense of 10 Gbps or forty Gbps. besides the fact that, the bandwidth standards of purchaser connections are diversified and comparatively low, from 50 Mbps (and even decrease) to the complete bandwidth of a wavelength channel. which will successfully make the most of the community assets, a number of low-speed connections must be multiplexed onto a high-capacity wavelength channel, and so they have to be intelligently demultiplexed and switched at intermediate nodes sooner than attaining their locations. This challenge is often called site visitors grooming, that's a very vital challenge for either companies and proprietors. This booklet will trap the state-of-the-art within the layout and research of community architectures, protocols, and algorithms to enforce effective site visitors grooming in optical WDM mesh networks.

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Extra resources for Traffic Grooming in Optical WDM Mesh Networks

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The network cost is measured by the fiber cost, OXC or DXC port cost, and WDM system cost used in the network. 8 (from [Cox and Sanchez, 2001]) gives an example on this network design and planner problem considering traffic grooming. 8(a) shows a four-node network and the traffic demands. Each link in Fig. 8(a) is a fiber conduit, which may carry multiple fiber links. Assume that the cost of a fiber going through one conduit is one unit and the capacity of a wavelength channel is OC-192. Five segments exist in Fig.

For example, these routes can be the firstshortest-path, the second-shortest-path, etc. When a connection request comes, the source node attempts to establish the connection on each of the routes from the routing table in sequence, until the connection is successfully established. Since fixed-alternate routing provides simplicity of control for setting up and tearing down connections, it is also widely used in the dynamic connectionprovisioning case. It has been shown that, for certain networks, having as few as two alternate routes provides significantly lower blocking than having full wavelength conversion at each node with fixed routing [Ramamurthy and Mukherjee,2002].

Let t(5, d) denote one connection request between s and d, which has not been successfully carried yet. Let C denote the wavelength capacity. • Maximizing Single-Hop Traffic (MST). The basic idea of this heuristic is introduced in [Mukherjee, 1997] for the traditional virtual-topology design problem. This simple heuristic attempts to establish lightpaths between source-destination pairs with the highest T{s,d) values, subject to constraints on the number of transceivers at the two end nodes, and the availability of a wavelength in the path connecting the two end nodes.

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