本文依据电子书交换系统(ebx)的DRM技术，构建了数字图书馆电子书服务的理论模式。
A theory pattern of e-book service is established for the digital library based on DRM technologies of e-book exchange (EBX) system.
模拟用户线接口电路是数字程控交换系统的重要组成部分。
Subscriber line interface circuit is an important part of digital program-controlled switching system.
本文叙述了一种适用于低速数字信道的地址编码时分交换系统的新的电路方案。
A new circuit scheme for the address coded TDM switching system of low speed digital channels is discussed in this paper.
先进的数字移动通信技术、sdh光通信系统技术、密集波分复用技术得到广泛采用，宽带综合业务数字网、at m宽带交换系统等高新技术正在网上试验。
Advanced technologies like digital mobile communications, SDH, dense WDM, etc. have found wide application and high and new technologies like B-ISDN and ATM are on trial over the network.
先进的数字移动通信技术、sdh光通信系统技术、密集波分复用技术得到广泛采用，宽带综合业务数字网、at m宽带交换系统等高新技术正在网上试验。
Advanced technologies like digital mobile communications, SDH, dense WDM, etc. have found wide application and high and new technologies like B-ISDN and ATM are on trial over the network.
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