At the telephone company end, ISDN lines connect to a digital switch.
在电话局一端，ISDN线连到数字交换机。
Within a few years the whole country will switch over to digital television.
几年内全国将会换上数字电视。
The function and principle of hitless switch in digital microwave system are introduced.
主要介绍了数字微波传输中无损伤切换的作用和基本原理。
The function and principle of hitless switch in digital microwave system are introduced.
主要介绍了数字微波传输中无损伤切换的作用和基本原理。
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