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1引言目前,东方有线网络有限公司(OCN)正在上海市推行互动电视,建设基于有线双向网络的交互数字电视(ITV)平台,以满足用户按需点播(Video on
1 Introduction At present, Oriental Cable Network Co., Ltd. (OCN) is implementing interactive television in Shanghai to build an interactive digital television (ITV) platform based on a two-way cable network to meet the demand of users on-demand