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为支持规模较大的电视会议，需要将多个ＭＣＵ级联起来，构成ＭＣＵ级联网。基于我们研制的已在郑州铁路局投入使用的ＮＪＵ系统和该系统进行级联工作，介绍级联组网的特点和级联网的软件算法。由于会议电视业务的多点连接特性，在以端口级联方式级联而成的ＭＣＵ级联网中级联信道可能被多个连接占用，为解决信道争用的问题。我们提出了ＭＣＵ端口／中继级联的方案。根据会议电视ＢＡＳ信令的结构，本文讨论了用硬件实现ＢＡＳ码的有效性检测、提取和插入；用软件完成ＢＡＳ码的有效性判断、解释和处理的方法及ＭＣＵ级联扩展后的基本业务的算法。
To support larger teleconferencing, multiple MCUs need to be cascaded together to form an MCU cascade network. Based on the NJU system that we developed and put into use in Zhengzhou Railway Bureau and the system for cascading work, we introduce the characteristics of cascaded networking and the software algorithms of cascaded networks. Due to the multipoint connection feature of the videoconferencing service, cascaded channels in an MCU cascade network cascaded through a port cascade may be occupied by multiple connections, so as to solve the channel contention problem. We propose a solution for MCU port / trunk cascading. According to the structure of conference TV BAS signaling, this paper discusses the validity detection, extraction and insertion of BAS code in hardware. The method of judging, explaining and processing the validity of BAS code by software and the basic service after MCU cascade expansion Algorithm.