高速公路紧急电话系统

Freeway Emergency Telephone System

ET-1型紧急电话系统安装在沈大高速公路辽阳管理所,于1990年8月20日投入运行.该系统控制台(或称主机)设置在辽阳管理所(下王家),在所辖51公里路段的道路两侧共设置51部紧急电话分机.本文主要论述紧急电话系统构成、紧急电话传输系统、系统功能、电原理、紧急电话分机结构和系统的实用性.

ET-1 type emergency telephone system has been put into operation in Shenyang-Dalian Freeway. The main Controller of the system is installed in Xiawangjia and covers fifty kilometers of the freeway with fifty-one extensions. In this paper, the composition of the system, transmission system, system function, electrical principles and structure of emergency telephone extensions as well as its practicability are presented.