By Keyao Zhu
ISBN-10: 0387254323
ISBN-13: 9780387254326
ISBN-10: 0387270981
ISBN-13: 9780387270982
Optical-fiber applied sciences using wavelength-division multiplexing (WDM) are presently being researched and commercially deployed to fulfill our expanding bandwidth requisites simply because, by utilizing WDM know-how, an optical fiber can help a number of non-overlapping wavelength channels, each one of which generally operates on the information cost of 10 Gbps or forty Gbps. even if, the bandwidth necessities of shopper connections are different and comparatively low, from 50 Mbps (and even decrease) to the total bandwidth of a wavelength channel. with a purpose to successfully make the most of the community assets, a number of low-speed connections have to be multiplexed onto a high-capacity wavelength channel, they usually must be intelligently demultiplexed and switched at intermediate nodes earlier than attaining their locations. This challenge is often called site visitors grooming, that's an exceptionally very important challenge for either companies and proprietors. This e-book will catch the cutting-edge 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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Additional info for Traffic Grooming in Optical WDM Mesh Networks
Example text
3. 3. Node architecture 2: SONET over WDM. ADMs. ) or switched to another ADM and sent out on another wavelength. 3 presents a SONET-over-WDM node architecture. ) and SONET framing schemes can provide TDM-based fast multiplexing/demultiplexing capability, compared with the software-based scheme in Fig. 2. The disadvantage of this approach is the high cost of SONET components, such as ADM and DXC. In reality, both kinds of access stations may be used together to be connected with an OXC in order to have a multi-service provisioning platform (MSPP) for accessing an OXC in a carrier's network.
Maximizing Resource Utilization (MRU). Let H{s,d) denote the hop distance on physical topology between node pair (s^d). Define T{s,d)/H{s,d) as the connection resource utilization value, which represents the average traffic per wavelength link. This quantity shows how efficiently the resources have been used to carry the traffic requests. This heuristic tries to establish the lightpaths between the node pairs with the maximum resource utilization values. When no lightpath can be set up, the remaining blocked traffic requests will be routed on the virtual topology based on their connection resource utilization value t{s^ d)/H (5, d), where t{s, d) denotes a blocked connection request, and H (5, d) denotes the hop distance between s and d on the virtual topology.
This quantity shows how efficiently the resources have been used to carry the traffic requests. This heuristic tries to establish the lightpaths between the node pairs with the maximum resource utilization values. When no lightpath can be set up, the remaining blocked traffic requests will be routed on the virtual topology based on their connection resource utilization value t{s^ d)/H (5, d), where t{s, d) denotes a blocked connection request, and H (5, d) denotes the hop distance between s and d on the virtual topology.