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交换式数字视频接入系统采用共缆分纤方式分别用传输交互式基带数字信号，而用单向光纤同轴混合（ＨＦＣ）系统传输模拟信号，免去了双向ＨＦＣ 频分复用传输所带来的系列问题，大大简化了网络结构，文章在介绍了Ｃａｂｌｅ Ｍｏｄｅｍ 的基础上，分析了交换式宽带接入系统的技术特征以及其相对双向ＨＦＣ的接入优势，并讨论了其可能的应用前景
The exchangeable digital video access system uses the transmission mode of sub-cable and sub-fiber respectively to transmit the interactive baseband digital signal, while the analog signal is transmitted by the unidirectional optical fiber co-axial hybrid (HFC) system, eliminating the need for bidirectional HFC Based on the introduction of Cable Modem, this paper analyzes the technical characteristics of switched broadband access system and its access advantages to bidirectional HFC, and discusses its possible application prospects