通信技术日新月异,其总的发展趋势是数字化、综合化、智能化、宽带化和个人化。1.数字化目前,世界各国都在以数字化通信网络取代传统的模拟网络。我国公用电信网络也基本上实现了模拟技术向数字技术的转变,全国长途传输数字通信已达到90%,全国局用电话交换机基本上实现了数字程控化。 With the ever-changing communication technology, its general trend of development is digitization, integration, intelligence, broadband and personalization. 1. Digital At present, all countries in the world are replacing traditional analog networks with digital communication networks. China’s public telecommunications network has basically realized the transformation of analog technology to digital technology. The national long-distance transmission of digital communications has reached 90%. National Bureau of telephone exchange basically realized the digital programming.