The Application Of Double DNI Inter-node Ring Using Double AU To Chieve In The SDH Local Network

This paper mainly discusses the implementation of local transmission networks SDH under the conditions of double node cross-loop service protection and low transmision rate. Now, this type of protection has been used successfully in the local network of our company through many times of test. It avoides effectively the loss when complex channel loops occur fault simultaneously, and thus improved greatly the running quality of the network.This paper consists of four sections. The importance of the security of the communication network was introduced in Chapter one and an overview of the SDH transmission system was presented in Chapter two. In Chapter three we discussed the transmission structure and the protection principle for the SDH network based on the theory of the SDH transmission system. The chapter four discussed the designing of this implementation modality.To realize the DNI double node cross-loop service protection , the configuration for realizing the fucntion of this system was discussed and some experimential data were given.We also explore the implementation ways and the application in view of SDH transmission system, analyze the structure of SDH system network and the principle of service realization. At the same time we give full consideration to the syeparameters such as the cost performance for designing the system. The design of this system can be used for reference for other complicated double fiber channel protection loop network service and improved the integrity competition advanage of the network of the operator.