网络可用性是业界SLA(服务等级协议)的重要指标之一, 提高光网络可用性是当今ISP(网络服务供应商)面临的现实问题, 同时也是国内外学术界研究的热点。文章在现有波分复用光网络研究的基础上, 利用Java语言编写启发式算法, 提出基于M∶N保护技术的可用性分析模型。结果表明, M∶N保护技术可以很大程度地提高光网络可用性, 链路保护技术较路径保护技术以耗费预留网络资源为代价可以获得更高的可用性。

Network availability is one of the important indexes of the Service Level Agreement (SLA) in the field of telecommunications and its improvement is a realistic issue for Internet Service Providers (ISP) and also a hot topic of research in the academic circles at home and abroad. On the basis of the existing researches on Wavelength Division Multiplexing (WDM) networks, this paper develops an heuristic algorithm using Java language and presents an M∶N protecting technology-based availability analysis model. The results show that this technology can enhance the network availability to a great extent and the link protecting technology can achieve still higher availability at the expense of consuming the reserved network resource than the path protecting technology.