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1引言在SDH传输系统的网络保护方式中,双纤双向复用段保护环由于节省传输带宽、配置简单等优点被广泛应用。但是,网络规模的增长和传输业务种类的增多。对保护倒换的成功率提出了更高的要求。因为复用段保护倒换采用APS(Automatic Protection Switching,自动保护开关)协议,
1 Introduction In the network protection mode of SDH transmission system, the dual fiber bidirectional multiplex section protection ring is widely used due to the advantages of saving transmission bandwidth and simple configuration. However, the growth of the network scale and the increase of types of transmission services. The success rate of protection switching put forward higher requirements. Because the multiplex section protection switching adopts APS (Automatic Protection Switching) protocol,