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在现代社会,随着人们社会生活的范围扩大、节奏加快,通信已经成为社会交往中须臾不可离的纽带。各种通信手段,如电子信件、电话及传真等,把人们紧密地联结在一起。 现代通信网是信息社会的基础设施。任何一种通信业务都离不开通信网络,这种网络是由终端设备、传输设备和交换设备组成。 通信终端设备包括电话机、传真机、用户电报机、数据终端和图像终端等。把信号从一个地方传送到另一个地方,需要通过传输设备。电缆、海底电缆
In modern society, with the expansion of people’s social life and the accelerated pace of communication, communication has become an indispensable link in social interaction. Various means of communication, such as e-mail, telephone and fax, bring people together closely. Modern communication network is the infrastructure of information society. Any kind of communication business is inseparable from the communication network, this network is composed of terminal equipment, transmission equipment and switching equipment. Communication terminals include telephones, facsimile machines, subscriber telephones, data terminals and video terminals. Transmitting signals from one place to another requires the transmission of equipment. Cable, submarine cable