concentration line meaning in Chinese

公共线
总线

The paper presents the development of the station network schemes for monitoring control system for electromechanical equipment of guangzhou metro , including local area network for communications within the station , plc controller and the configuration structure and characters of site concentration line and so on
摘要主要介绍广州地铁机电设备监控系统车站级组网方案的发展及演变过程，包括站内通信局域网、 plc控制器、现场总线等的配置结构和特点。