toll communication

To improve the service level of toll station, the end-to-end communication/ monitoring system has been used in freeway in recent years.

为提高收费站文明服务的水平、近年来，高速公路开始引入有线对讲/监听技术。

互联网摘选

This paper states the first opened digital railway division communication system which is constructed with Δ M multiplex transmission system and digital division telephone switching system on the toll symetrical cable at Zhengzhou-Luoyang Railway Division.

本文介绍了在郑州&洛阳区段的长途对称电缆上开通的我国铁路第一个数字式区段通信系统，它由△M多路复用传输系统和数字式区段电话交换系统构成。

互联网摘选