A Network Simulator Development For Service Transportation And Protection Over SDH Networks

With the construction of “Smart Power Grids”, the role of power communication network in power systems is becoming increasingly important, the stability of power system is increasingly affected by power communication network failure. As SDH transmission network is the core part of power communication network, the reliability of it is an important research topic. In order to assess the reliability of SDH transmission network, simulation of SDH transmission network is needed.This thesis focuses on the design and implementation of SDH transmission network simulation. The main contents are as follows.Firstly, the thesis discusses the status quo of SDH transmission network simulation and presents a system development program, which is based on the GLASS / SSFNet simulation software. Then,the thesis gives the needs of SDH transmission network simulation, including system modeling,service simulation, fault and alarm simulation. The thesis analyses the calculation structure and the underlying code structure of GLASS / SSFNet.Secondly, the thesis presents a system architecture design of SDH transmission network simulation, including service transportation function and service protection function. In order to implement service transportation function simulation, the class ENIC, class MSAdaptor and class SNE are developed. In order to implement service protection function simulation, the class APS and class APSMessage are developed.Finally, the thesis designs test cases for simulation function, including service loopback test,service add / drop test and APS process tracking test. The feasibility and effectiveness of SDH transmission network simulation are verified.