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在分析 CATV、计算机、电信三网的特点和互连存在问题的基础上 ,提出了基于 HFC的三网合一实现方案 ,该方案能将 CATV、电信和计算机三网融合在一起 ,以实现语音、视频、数据等多媒体信息的综合传输 .详细介绍了三网合一的网络结构、系统功能业务和频谱分配 .系统的网络结构主要由路由器、交换机、前端单元(HEU )和远端接口单元 (RIU )组成 ;功能业务主要包括模拟专线业务、ISDN业务、高速 Internet和数据信息服务业务、多媒体信息服务和视频点播业务、视频会议和可视电话业以及遥测服务 ;频谱分配为三段 ,即 0～ 5 0 MHz,5 0～ 5 5 0 MHz和5 5 0～ 75 0 MHz.
Based on the analysis of the characteristics and interconnection of CATV, computer and telecom networks, this paper proposes a scheme of triple play based on HFC, which can combine CATV, telecom and computer triple play to realize voice , Video, data and other multimedia information.This paper introduces in detail the network structure, system function service and spectrum allocation of triple play.The system’s network structure mainly consists of router, switch, front end unit (HEU) and remote interface unit RIU). The functional businesses mainly include analog private line services, ISDN services, high-speed Internet and data information services, multimedia information services and video on demand services, video conferencing and videophone services, and telemetry services. ~ 50 MHz, 50 ~ 550 MHz and 550 ~ 75 0 MHz.