连接导向式(Connect-Oriented)的虚拟线路(Virtual Circuit)：讯息在传送前先建立一条逻辑的虚拟线路，在关闭连接时撤消。
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每个 虚拟线路上的通信可以用其自己特定的密钥进行加密。
Traffic on each virtual circuit can be encrypted with its own distinct key.
论述采用PSTN电话网，建立“虚拟”多点数据监测的依据和实现方法，实现利用既有PSTN电话网络和线路资源，完成多种信息采集、传送功能。
To make a good use of resource of the PSTN telephony lines, to complete various functions of data collection and transmission is also presented.
对电子线路传统实验方法与虚拟实验方法进行比较、分析，建议以传统实验方法为基础，重视和充分利用虚拟方法。
This article compares and analyses the traditional experimental methods and dummy ones, and suggests the traditional methods as a base, and strengthens and use dummy ones adequately.
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