论文部分内容阅读
ISDN是由电话网络发展而来,并提供终端到终端的数字连接,以支持包括语音和非语音的业务,并且用户可以通过有限的一组标准多用途接口来连通的大范围的网络业务。ISDN是对传统电话网的增强,这意味ISDN终端应该能插入世界上任何位置的ISDN中,并且仍提供完整的特性和功能。 一、ISDN概述 自70年代ISDN概念提出之后,西方电信发达国家就已经开始了ISDN技术的研究及终端产品的开发,有些国家还制定了ISDN发展计划,将ISDN的发展作为90年代电信发展的主要战略目标。
ISDN is evolved from the telephone network and provides end-to-end digital connectivity to support a wide range of network services including voice and non-voice services, and the user’s connectivity through a limited set of standard multipurpose interfaces. ISDN is an enhancement of traditional telephone networks, which means that ISDN terminals should be plugged into ISDN anywhere in the world and still provide full features and functionality. I. Overview of ISDN Since the concept of ISDN was put forward in the 1970s, the developed countries of the Western Telecom started the research on ISDN technology and the development of end products. Some countries also formulated the ISDN development plan. Taking the development of ISDN as the main telecom development in the 1990s Strategic objectives.