Cable Modem is type of netwoek bridge and medem that provides bi-directionary communication var radio frequency channel on a HFC and RFoG infrastructure
HFC stand for Hybrid fibre-coaxial( chinese is 混合光缆同轴）
RFoG stands for Radio Frequency over Glass,in which the coax partion of HFC network replaced by a single-fiber,passive optical architecture(PON)
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