As a kind of newly developing business, its charge system and communication course control are closely combined together.

作为一种新兴业务，其计费系统与通信过程控制非常紧密地结合在一起。

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Field bus is a kind of serial digital data communication chain way, it links up to basically control in production field and high levels control course in the automation's control equipment.

现场总线是一种串行的数字数据通信链路，它沟通了生产领域的基本控制过程之间以及与更高层次控制过程的自动化控制设备之间的联系。

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The second refers to interactivity, through which the subscriber can have full interactive control over the whole course of communication. Finally, it is synchronization.

二是交互性，指向人们提供多种交互控制的机制，用户对通信的全过程有完整充分的交互控制能力。

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