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介绍了一个三级多媒体监控系统中ISDN通信子系统的设计和实现。该系统采用了标准接口Common-ISDN-API实现对ISDN通信设备支持。该文在讨论了CAPI的特点及其结构后，分析了如何利用软件实现ISDN多B信道连接的技术，并给出了利用该结构实现的ISDN通信子系统的组成和系统架构。
The design and implementation of ISDN communication subsystem in a three-level multimedia monitoring system are introduced. The system uses a standard interface Common-ISDN-API to achieve ISDN communications equipment support. After discussing the characteristics and structure of CAPI, this paper analyzes how to use software to realize ISDN multi-B channel connection, and gives the composition and system architecture of ISDN communication subsystem realized by this structure.