In the hybrid fiber-coax(HFC)architecture,the coax is a shared medium to which the network interface unit(NIU)of an end-user is attached for accessing a diversity of network services.

• 在HFC系统结构中,终端用户可以通过网络请求不同的业务服务,对于用户的网络接口单元(NIU),同轴电缆是其共用的传输介质。