Research And Implementation Of Analog Line Signaling In The Private Network

The private network usually apply to safety production, organization and management in some special industries and departments. Nowadays, with the development of the economy and the progress of the technology of information, the purpose of the private network is also changing. And the private PBX is the core equipment in the private network, it is responsible for analog telephone, wireless users, SIP telephone access and integrated services network, which simulate user as a private network switch in the basic user, and carries a lot of call task.This thesis mainly studies analog line signaling realization in call processing software of the private PBX, including the realization of the user’s picking hang up, the generation of signal, the design and implementation between analog line software and the maintenance software. This paper first studied the private network communication and the structure of the private PBX; The second, This paper introduces the basic call process of the analog line signal, and analyze the part of the analog line signal with the call control entity. The call control system is described by the finite state machine. The third, by using C language to achieve the function of the analog line calls and the connection between modules. Finally by writing the test cases, analog line signaling call processing tasks are sended to the call control software, the same as the call control software runs and outputs corresponding signaling primitives, so as to verify the feasibility of this research. The hardware platform of the main control board for the central processing unit(CPU) is the MOTOROLA MPC8086 chip, and the software platform is embedded VxWorks operating system, the developing and the compiling environment is wind river Tornado2.2 of the company.