Design And Implementation Of Subway Communication System Based On Softswitch

Along with the rapid development of modern communication technology,the exchange of voice communications has evolved from the initial space division switch mode to the current packet-switch mode.However,in the next-generation voice switch network,the softswitch technology based on IP packet will gradually reduce the applications of other present switch technologies.This thesis firstly lists and demonstrates the development of voice communications swith technology,then analyzes some popular program-controlled swith technologies in the current domestic subway industry.Meanwhile,the related discussion on the current novel softswith technology has been carried on,and the structure constitutes,application characteristics,specific performance parameters of the system are analyzed in detail,especially on the new features provided by softswith technology.Finally,according to the network planning requirements of the Chengdu metro,especially considering the maintenance and expansion of the public telephone system after the subway network formation,and in comparing the existing program-controlled swith technology and softswitch technology,the design scheme of the subway telephone network based on the softswith tecenology is proposed.Softswitch design work in this thesis is closely combined with the future development trend of Chengdu Metro Construction,setting the ring subway engineering of Chengdu Metro Line 7,line 10 and COCC as an example.According to the demand analysis of the official telephone system based softswitch technology,the network architecture of the system is developed preliminarily,and then the construction of the official telephone system is studied and designed in detail.The specific design principles and implementation methods are determined by estimating the users scale of the future subway network.Any place that has computer network will have potential safety problems.For the principles of the safety and reliability of the softswith network,this important factors and principles of how to ensure safety is set forth in detail combing with the existing subway softswitch application in this thesis.Before the adoption of new technology in Metro Communication,it is necessary to carry out relevant safety research.At the same time,through the establishment of the h protocol process call instance model,the thesis focuses on the normal call flow of h protocol.For the follow-up of the subway soft switch maintenance work to provide the disposal process and detailed,improve maintenance efficiency.By the detailed discussion and Research on the subway communication technology based on Softswitch,the features and advantages of softswitch technology in the process ofthe development of the subway are fully demonstrated.By designing the new construction plan of the future subway communication system,it provides a good reference direction for the maintenance of communication system in the future work,and enhances the control efforts of the new technology of subway communication.