城市轨道交通公务电话系统组网方案的分析

城市轨道交通公务电话系统是轨道交通运营控制和管理的重要通信工具。本文通过对公务电话系统功能需求的分析，给出了专用通信网公务电话系统的几种组网方案。通过对这些方案的分析和比较，得出了适应目前我国城市轨道交通行业的公务电话组网方案。

The analysis of network scheme of public telephone system in urban railway transportation

Public telephone system in urban railway transportation is an important communication tool of urban railway transportation control and management. Based on the analysis of function about public telephone system, several schemes of public telephone system are given. Through comparing and analyzing these schemes, the network scheme that is adapted to the current the public telephone system of in urban railway transit industry is obtained.