Research On Subway Telephone System Based On Softswitch Technology

Rail telephone switching system is using for command and control, internal and external liaison, maintenance organizations, work calls, urgent and other infrastructure information transfer. Subway service telephone system mainly serves the metro internal operations, governance, repair, business communication and other office call contact, each subway line official telephone system is disconnected from others, only connected through the exchange of data in the control center or a temporary control center, the public telephone system can be used as an emergency communication dedicated telephone system when necessary. With the construction of the subway line network, the user demand for rail communication services for data, video conferencing, image, etc. are increasingly diversified, program-controlled switching technology single voice and low speed data services can not meet the internal rail demand for work. In this paper, use Kunming Rail Transit the first phase of the project and Line 3 as an example, it describes the technical characteristics of each program-controlled switching and soft switching technology, network architecture, and also provides the basis for post-Kunming Rail Transit Line 3 maintenance work in advance.Kunming subway telephone service system uses the program-controlled switching technology, in the temporary control center set up central control equipment, including SPC-PBX, trunking gateway, application servers, network management, billing systems, intelligent attendant console, signaling gateway and other equipment. Independent nodes, depot set up integrated access devices, connected via a transmission system interface, business telephone network. Construction and implementation of this paper is analyzing public telephone system system configuration, system capacity, terminal settings, system functions, describes the public telephone system.Kunming subway Line 3 telephone system service uses soft switching technology, Line 3 temporary control center responsible for the line circuit switched services, and temporary control center through interconnection with the first phase project, to achieve Line 3 line network with other business data exchange Thesis by analyzing Line 3 telephone system, system configuration, system capacity, terminal settings, system functions, elaborate soft switching technology to meet the basis of the original subway official business demand, and video conferencing capabilities, and saving construction costs and maintenance costs.