Design of a meta-mesh of chain subnetworks: enhancing the attractiveness of mesh-restorable WDM networking on low connectivity graphs
Design of a meta-mesh of chain subnetworks: enhancing the attractiveness of mesh-restorable WDM networking on low connectivity graphs
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链子网元网格设计：增强低连接图上网格可恢复 WDM 网络的吸引力
DOI：
10.1109/49.974661
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发表时间：
2002
期刊：
影响因子：
--
通讯作者：
J. Doucette
中科院分区：
文献类型：
--
作者：
W. Grover;J. Doucette
我们开发了一种设计改进，以提高稀疏设施图上跨度可恢复网状网络的容量效率。新方法将网络视为“链子网络的元网格”。这使得 WDM 网状网络的前景比以前平均节点度较低的基于网状的设计更具经济可行性。元网格图是完整网络的同构，其中边要么是直接跨度，要么是 2 度节点链。主要优点是环回型备用容量仅针对在链中发起或终止的工作需求提供，而不是针对跨链的整个流。中转（“快速”）流在元网格图中完全受到网格保护，元网格图中的平均程度更高，因此网格恢复的效率比整个网络高。将快速光路整理到逻辑链旁路跨度上还可以节省节点设备。只有元网格节点需要光交叉连接功能。其他站点使用 OADM 和/或玻璃窗。由此产生的设计包括一类特殊的可恢复网络，它介于纯跨度恢复和路径恢复之间。路径恢复的大部分效率都已实现，但采用了更局部化的跨度恢复机制，并且可能比路径恢复更快、更简单。该概念适合使用具有无源波段直通功能的 OADM 来实现，以支持快速光路的逻辑链旁路跨度。
We have developed a design refinement to increase the capacity efficiency of span-restorable mesh networks on sparse facility graphs. The new approach views the network as a "meta-mesh of chain subnetworks". This makes the prospect of WDM mesh networking more economically viable than with previous mesh-based designs where the average nodal degree is low. The meta-mesh graph is a homeomorphism of the complete network in which edges are either direct spans or chains of degree-2 nodes. The main advantage is that loop-back-type spare capacity is provided only for the working demands that originate or terminate in a chain and not for the entire flow that crosses a chain. The transiting ("express") flows are entirely mesh-protected within the meta-mesh graph which is of higher average degree and hence efficiency for mesh restoration than the network as a whole. Nodal equipment savings also arise from the grooming of express lightpaths onto the logical chain-bypass span. Only the meta-mesh nodes need optical cross-connect functionality. Other sites use OADMs and/or glassthroughs. The resultant designs comprise a special class of restorable network that is intermediate between pure span restoration and path restoration. Most of the efficiency of path restoration is achieved, but with a span restoration mechanism which is more localized and potentially faster and simpler than path restoration. The concept lends itself to implementation with OADMs having a passive waveband pass-through feature to support the logical chain bypass spans for express lightpaths.