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通信现代化是世界各国为适应社会信息化需要的战略目标。现代通信网的演变历程大体要经历数字化、综合化和宽带化三个阶段，并向实现智能化、全球化和个人化的方向发展。在一些发达国家和我国发达地区，通信网的数字化已基本实现。下一步发展方向将是综合业务数字网（ＩＳＤＮ）。ＩＳＤＮ将成为本世纪末及２１世纪的通信网。我国也将在数字化的基础上发展ＩＳＤＮ。
The modernization of communications is a strategic goal of all countries in the world to meet the needs of social informatization. The evolution course of modern communication network generally goes through three stages of digitization, integration and broadbandization, and develops toward the realization of intelligence, globalization and personalization. In some developed countries and developed areas in our country, the digitization of communications networks has basically taken shape. The next step in the direction of development will be Integrated Services Digital Network (ISDN). ISDN will become the communication network of the end of this century and the 21st century. Our country will also develop ISDN on the basis of digitization.