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数字化革命带来了HFC的变化,媒体和网络的双重融合将在今后改变广播电视系统的结构和运营模式,对传统广电传输网络提出了新的挑战。对于如何构建面向未来的广电交互信息传输网络,现在已形成共识的是采用IP技术和光纤传输技术建设宽带骨干传输网络,接入网部分的数据下行仍通过HFC网络传输至用户端。源于互联网的内容分发网络技术(Content Delivery Networks,即CDN),将在广电骨干传输网络中发挥重要的作用;另一方面IPQAM技术的迅速发展和普及,使得基于HFC+IP网络的业务模式得以全面推广。IPTV技术的成熟与应用,为电信行业开展视频业务提供了技术上的解决手段,也给广电行业的传统视频业务造成了巨大的冲击与威胁。要应对外界的竞争压力,广电必须充分应用双向有线电视网开展基于IPQAM技术的互动电视业务运营,积极推进IPQAM、CDN等技术在有线电视系统中的应用,才能稳固广电在视音频交互业务方面的优势。以VOD业务为代表的交互电视是当前的发展热点,如何充分结合CDN网络和IPQAM技术,构建新型的大规模商用VOD体系平台,是本文讨论的重点。
The digital revolution has brought about the change of HFC. The dual integration of media and network will change the structure and operation mode of radio and television system in the future, posing new challenges to the traditional radio and television transmission network. How to build a future radio and television interactive information transmission network, it is now agreed that the use of IP technology and optical fiber transmission technology to build broadband backbone transmission network, part of the access network data downlink is still transmitted through the HFC network to the client. Content Delivery Networks (CDNs), which originated from the Internet, will play an important role in the backbone transmission network of radio and television. On the other hand, the rapid development and popularization of IPQAM technologies will enable the business models based on HFC + IP networks Comprehensive promotion. The maturity and application of IPTV technology provide a technical solution for the video industry in the telecom industry, and also pose a huge impact and threat to the traditional video services in the broadcasting and TV industry. In order to cope with the competitive pressures of the outside world, radio and television must fully utilize the bidirectional cable television network to carry out interactive television service operation based on IPQAM technology and actively promote the application of technologies such as IPQAM and CDN in the cable television system in order to stabilize the broadcasting and television interactive service in terms of video and audio Advantage. The interactive TV represented by VOD service is the hotspot of development. How to fully integrate the CDN network and IPQAM technology to build a new type of large-scale commercial VOD system platform is the focus of this article.