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４．ＨＦＣ双向接入网 ＨＦＣ即混合光纤同轴电缆网（Ｈｙｂｒｉｄ Ｆｉｂｅｒ Ｃｏａｘ）。随着有线电视网与宽带信息业务的结合，广大有线电视用户可以利用现有的有线电视网享受到各种流行的数字新业务。 １９９５年 １１月，美国的一些有线电视经营商和研究机构ＣａｂｌｅＬ
4. HFC bidirectional access network HFC hybrid fiber coaxial cable network (Hybrid Fiber Coax). With the combination of cable television network and broadband information services, the majority of cable television users can enjoy all kinds of popular digital new services by using the existing cable television network. November 1995, CableL, a number of U.S. cable operators and research institutes