以下为句子列表：
英文: Addressable - Able to signal from the headend or hub site in such a way that only the desired subscriber's receiving equipment is affected, making it possible to send a signal to a subscriber to change their level of service (e.g. adding a new premium cha
中文: 有选址功能的--有选址功能的有线电视设备，能从有线电视设备前端或电线插孔发出节目信号，只有那些有需求的用户的接受设备才能收到此信号，这就能做到向用户发出信号来改变他们的服务水平，比如增加一个新的付费频道等。
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英文: Larger cable systems are often served by multiple hub sites, with each hub linked to the main headend by a transport link such as fiber optics, coaxial trunk cable or microwave.
中文: 每个分支有一条传送线路与主前端相连接，例如使用光纤、同轴电缆干线或微波。
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