数字电话网
- 网络Digital telephone network;ISDN;IDN
数字电话网-
数字电话网的同步问题
Synchronization in Digital Telephone Network
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中国大都市公用数字移动电话网发展探讨
The exploration on development of public digital mobile telephone network in metropolises of China
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ΔM与PCM兼用的数字电话模拟交换网
A Telephone Network Consisting of △ M and PCM Hybrid Digital Carrier and Analog Switching
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增量调制（ΔM）与脉码调制（PCM）兼用的数字电话模拟交换网具有灵活、经济及满意的质量等特点，适用于工业通信系统及其它类似场合。
A telephone network consisting of both △ M and PCM digital coding channels and analog switching is advantageous in flexibility and economization , also it has satisfactory quality , so it is suitable for applications in industrial communication systems and other similar fields .