公共电话交换网(PSTN)的线路和流量也在减少。

The number of lines and traffic of the Public Switched Telephone network (PSTN) network have also been decreasing.

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公共电话交换网(PSTN)是最广泛使用的通信线路，因此在PSTN线路上传输视频具有广阔的应用前景。

It is most extensively used Lines of Communication to Public Switched Telephone Network (PSTN), hence the video surveillance system based on PSTN possesses widespread application prospects.

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系统还利用由MODEM和公用电话交换网组成的通讯线路进行远程数据传输。

And that, teledata transfer are realized through Lines of Communication which is build-up by MODEM and Public Switched Telephone Network.

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系统还利用由MODEM和公用电话交换网组成的通讯线路进行远程数据传输。

And that, teledata transfer are realized through Lines of Communication which is build-up by MODEM and Public Switched Telephone Network.

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