电话集中机是一种直接为铁路行车服务的站场通信设备。老式电话集中机采用继电器、扳键等元件,性能单一,故障率高,且难与新的通信设备联接,已不能满足铁路运输高速发展的需要。为此,研制了新一代程控电话集中机。1　基本特点JΗC型程控电话集中机除具有一般集中机的基本功能外, The telephone concentrator is a station communication device that serves the railway traffic directly. Old telephone concentrator using relays, pull keys and other components, the performance of a single, high failure rate, and difficult to connect with the new communications equipment, can no longer meet the needs of the rapid development of railway transport. To this end, developed a new generation of program-controlled telephone centralized machine. 1 Basic Features JHC type program-controlled telephone centralized machine in addition to the general function of a centralized machine,