基于CAN总线的船用数字程控交换机的软硬件设计

Hardware and Software Design of Digital PBX Based on CAN Bus

论文提出研制新型的基于CAN总线的数字程控交换机替换原有的全电子式自动电话交换机。因为数字交换方式,在通话语音响度、清晰度、串音干扰抑制、抗外部电磁及电源干扰等性能大大优于传统的模拟交换系统,在高性能处理机控制下还能提供原有交换机无法实现的多种新服务功能。程控交换机采用了分布式多处理机控制方式,无阻塞的数字时分交换网络,并采用高级语言设计系统软件,提高了软件系统的可靠性及可维护性。

This article is proposed to develop a new type of digital programme controlled telephone switching board which is based upon the CAN bus to replace the old automatic telephone switchboard. Because the performances such as the voice loudness and articulation, re straining crosstalk disturbance, resisting external electromagnetism and power interference and etc is greatly better than that of the tradition al simulative switching board. Under the control of the highperformance processor,the new digit switching board can provide some new serv ice functions, but the old one can＇t do it. The new switching board adopt the distributed multiprocessor control mode, digital time division and nonblocking switching network, and adopt highlevel language to design system software which can improve the reliability and the nmin tainability of the software system.