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本文从CCITT第XVIII研究组所制定的数字网规范的角度,回顾和综述了1985年以来数字网技术的进展,着重介绍了在ISDN用户线数字传输技术、ISDN中开发分组交换能力的方法、宽带ISDN、新的同步数字系列和语声处理等方面,CCITT的重要决策和成果,并指出今后的发展方向。
This paper reviews and summarizes the advances in digital network technology since 1985 in the perspective of digital network specifications developed by the Study Group XVIII of CCITT, highlighting the development of packet-switching capabilities in ISDN subscriber line digital transmission technology, ISDN, broadband ISDN, the new Synchronous Digital Series and voice processing, CCITT’s important decisions and achievements, and pointed out the future direction of development.