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Research on Survivability of Automatically Switched Optical Network

Author: XuHaiBo
Tutor: WangYaMin
School: Xi'an University of Science and Technology
Course: Communication and Information System
Keywords: Automatic Switched Optical Network Shared Risk Link Group Protection and recovery Link availability
CLC: TN929.1
Type: Master's thesis
Year: 2011
Downloads: 44
Quote: 0
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Abstract


With the rapidly growing popularity of the Internet and Internet Protocol (IP, Internet Protocol) data services showing explosive growth, a variety of new services are emerging, such as video on demand, bandwidth leased virtual private network (VPN, Virtual Private Network) . This brings broad market prospects and new profit growth point to the supplier, but also its transmission network higher requirements. Using synchronous digital hierarchy (SDH Synchronous Digital Hierarchy) network of the wavelength division multiplexing (WDM Wavelength Division Multiplexing) technology can not fully utilize the bandwidth, and network configuration slow and complicated to operate. In order to meet the needs of network development, will SDH and WDM-based optical layer networking technology and IP-based network intelligence technology, a way to automatically complete the network connected to the new network - Automatic Switched Optical Network ( The ASON, Automatically Switched Optical Network) came into being. Network technology to ensure network survivability in the event of a failure to restore its damaged business, the paper around the ASON survivability expand research work and results are as follows: (1) describes the three planes of ASON function, connection network model. ASON survival technology and features. IP network survivability, SDH network survivability compared ASON survival advantage. ASON routing module, routing and routing needs, and used the Bellman-Ford, Dijkstra and A-Star three shortest path algorithm were compared and analyzed. (2) for the ASON protection mechanisms and recovery mechanisms were studied. In view of the application of ASON has strong flexibility and diversity, the article discusses the ASON protection and restoration of several application strategy. ASON protection and recovery programs combining research, and the protection and restoration of the ASON domain analysis. (3) set forth the concept of shared risk link group, as well as protection principle based on the path under the Shared Risk Link Group. Part of the risk separation on the basis of research currently widely used the completely risk separation routing algorithm (CRDRA, Complete Risk Disjoint Routing Algorithm) routing algorithm (PRDRA, Partial Risk Disjoint Routing Algorithm), and the algorithm simulation and result analysis . The results show that the improved algorithm is high stability, route calculation can get a higher success rate and better resource utilization. But when the business path fails, the protection path probability of successful protection business has decreased to some extent. Therefore, when the network throughput performance requirements of high reliability requirements of small business, it is recommended that using PRDRA path protection algorithm, and can meet different performance requirements by adjusting the weight of a link algorithm; On the contrary, when the business high reliability requirements should be used CRDRA as channel protection algorithm.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Wireless communications > Lightwave communications, laser communications
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