轨道交通通信系统技术发展是伴随通信系统整体技术发展而演进的,这其中传输系统作为基础通信系统为其它通信系统和业务系统提供基础承载通道,本文力求通过对传输系统近年来主流技术的演变分析,探讨传输系统在轨道交通行业未来的发展应用情况。引言轨道交通通信系统由专用通信系统、公安安防系统和民用通信引入系统构成,其中专用通信系统包括传输、公务电话、 The development of rail transit communication system evolves along with the overall technical development of communication system. The transmission system serves as the basic communication system to provide the basic bearing channel for other communication systems and business systems. This paper tries to analyze the evolution of mainstream technology in transmission system in recent years , Discuss the future development and application of transmission system in the rail transit industry. Introduction Rail transit communication system consists of special communication system, public security system and civil communication system. The special communication system includes transmission, business telephone,