In recent years, with the rapid development of network and communication technology, it is possible to transmit video on real-time system.
近年来随着网络技术和通信技术的迅猛发展，使得实时视频传输成为可能。
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.
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。
News agency supposes information release centre, video audio-visual center, picture center, mass communication network, etc.
通讯社下设信息发布中心、视频音像中心、图片中心、大众传播网等。
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