随着数字技术的发展，在ＣＡＴＶ网上进行数据通信已成为一种新型业务，这是有效地利用剩余带宽资源进行多功能开发的一种途径，可实现互访、可视电话、会议电视等多种业务。数据通信系统一般由网络节点设备和用户接口设备组成，业务种类的不同，设于节点的网络设备也不完全一 With the development of digital technology, data communication over the CATV network has become a new type of service. This is a way to effectively exploit the remaining bandwidth resources for multi-functional development, enabling more visits, videophones, video conferencing and more Kind of business Data communication system generally consists of network node devices and user interface devices, different types of business, located in the node network equipment is not completely