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.
一种典型的WAN由称为信息包交换机的电子设备通过通信线路连接而成。
A typical WAN consists of electronic devices called packet switches interconnected by communication lines.
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