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文中提出一个用于小集团的小型可视电话模拟交换系统和现有的公共电话网同时使用的系统。该系统采用单片机进行控制，并可与微机接口，方便管理，能够扩展多种功能。
In this paper, a small video phone analog switching system for small groups and a system for simultaneous use of the existing public telephone network are proposed. The system uses a microcontroller to control and interface with the computer for easy management, to expand a variety of functions.