It can utilize simple and quick protecting - switching scheme to recover single optical cable and equipment failure at 100 % rate 它能够利用简单快速的保护倒换方案对单个的光缆断裂和设备故障完成100的恢复。
This involves convergence between qos and bandwidth control , convergence between control and management , dynamic routing , protection conversion , etc . 研究qos和带宽控制、控制和管理的融合，研究动态选路和保护倒换等。
Methods of measurement for equipment used in digital microwave transission systems . part 2 : measurements on terrestrial radio - relay systems . section 6 : protection switching 数字微波传输系统中所用设备的测量方法.第2部分:地面无线接力系统的测量.第6节:保护倒换
As there is expected to be a huge traffic to be carried on one stm - 1 link , the possibility of failures is running high . therefore , when stm - 1 interfaces are implemented on the exchange , the backup and protection rotation of circuits and the detour of routes must be given adequate stress 由于一条stm - 1链路将承载大量的话路，电路故障会产生重大影响，因此交换机采用stm - 1接口，必须认真考虑电路的备份和保护倒换以及路由的迂回。
Thirdly , some key technologies of optical layer protection such as fault monitoring , location , switching corporation , protection switching time were studied in chapter 3 , a method of optical power monitoring for primary path and otdr monitoring for protection path was provided 随后研究了光层保护的网络故障监测、倒换判椐、故障定位、倒换协调、保护倒换时间等问题，提出了主通道光功率监测、备用通道背向散射曲线监测的故障监测方法。
Generally speaking , the difference between control and management can be measured . the difference between cross - connection and switching is measured by circuit granularity . likely , the difference between protection conversion of the bottom layer and dynamic routing of the ip layer can be measured 通常控制和管理的区别是有度的，例如交叉连接与交换的区别是用电路颗粒和反应时间来区别的，同样底层的保护倒换和ip层的动态选路之间的差别也有度。
At the same time , the assay analyzes and illustrates on ochsp and omsp at detail . based on the design of wdm optical net scheme , this assay write o - apsp , which utilizes k1 , k2 that come from osc to sending failure messages of nodes . it also built aps model which grounded on oms 在对wdm光网络结构实现方式详细研究的基础之上，本文编写了光网络自动保护倒换协议( o - apsp ) ，利用来自光监控通道( osc )的k1 、 k2aps倒换字节来传送节点故障信息，建立了基于光复用段自动保护倒换模块。
The major problems found in the test was that some overhead bytes of the stm - 1 signal processed on those exchanges were inconsistent with those in the transmission system . this would to some extent undermine the effective cooperation of the nm function between the exchange and the transmission system , obstruct the alarm judgement and locating and impede the realization of the protection rotation function 测试发现主要问题是各交换机stm - 1信号的部分开销字节与传输系统不一致，这会在一定程度上影响交换机与传输系统二者的网络管理功能的有效配合，影响告警的判断与定位，影响保护倒换功能的实现。
Basic interoperability test is designed to check alarms on physical connections , the error rate of information delivery and the 2mbits cross - connect state when stm - 1 signals pass the transmission system . high - level interoperability test is to check the consistency of generated against readout overhead bytes , alarms and the performance monitoring as well as the synchronization , protection rotation , the interworking possibility of nm information and the o & m capability 基本互通能力测试包括：检查物理连接是否告警，检查信息传送有无差错，交换机stm - 1经过传输系统进行2mbits交叉连接的测试；高层次互通能力测试包括：开销字节产生和读出的一致性，告警一致性，性能监视一致性，同步，保护倒换，网管信息互通的可能性及维护操作能力的测试等。
