第三章中，介绍了HFC网络的结构并根据NDM - U模型给出了HF C宽带接入计费系统模型和系统数据流。
In the third chapter, HFC broadband network system technology is introduced and the billing system model and the system data follow are given according to NDM-U model.
第三章中，介绍了HFC网络的结构并根据NDM - U模型给出了HF C宽带接入计费系统模型和系统数据流。
In the third chapter, HFC broadband network system technology is introduced and the billing system model and the system data follow are given according to NDM-U model.
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