长途通信网 meaning in English
toll network
trunk network
Examples
- As soon as sdh appeared , it obtains broad applications in many fields including wan ( wide area network ) , lan ( local area network ) and man ( metropolitan area network )
正是这些pdh无法比拟的优势使得sdh一经出现,就显示出了强大的生命力,在城域主干网,长途通信网和广域网中得到了越来越广泛的应用。