NGN(Next Generation Network)，即下一代通信网络。下一代网络是以软交换为核心的，能够提供包括语音、数据、视频和多媒体业务的基于分组技术的综合开放的网络架构，代表了通信网络发展的方向。NGN是在传统的以电路交换为主的PSTN网络中逐渐迈出了向以分组交换为主的步伐的。
介绍了下一代通信网络的体系结构、软交换的接入设备、设备间接口协议标准，讨论了下一代通信网软交换的组网问题。
Introduces the system structure, access equipment's soft switch, interface protocol of next generation network, and discusses the networking problems of soft switch in next generation network.
WATM被认为是下一代个人通信网络的解决方案，或是B - ISDN网络的无线延伸。
WATM is regarded as the solution of the next generation personal communication, or the wireless extension of B ISDN network.
MVB通信网络是为快速的过程控制优化的总线，且适合用作车辆总线，这就使得MVB逐渐成为下一代车辆的通讯总线标准。
MVB communication network is an optimized bus for control system, and it is suitable for vehicle bus. Then it is becoming the communication standard for future railway vehicles.
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