90年代末以来,广电网络双向改造的问题一直在讨论之中。HFC同轴双向接入一直是广电网络改造的主流技术,但是真正运行得好的HFC双向网络不多。数字电视整体转换后,网络双向化的问题重新凸显出来,没有双向的网络,不可能开展交互式业务;没有交互业务,广电难以适应激烈的市场竞争。开展 Since the late 1990s, the issue of two-way transformation of radio and television networks has been under discussion. HFC co-axial two-way access has been the mainstream technology of radio and television network transformation, but really good HFC two-way network is not much. After the overall conversion of digital television, the issue of bidirectional network re-highlighted itself. There is no two-way network and it is impossible to carry out interactive services. Without interactive services, it is difficult for broadcasting to adapt to fierce market competition. Carry out