头端信号切换技术

James O. Farmer
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引用次数: 0

摘要

信号交换已经在CATV头端中实践,作为实现有限数量信道的更好利用以及商业删除和非复制替代的手段。在设计头端交换系统时,需要解决几个问题。可以在基带和IF切换之间进行选择,在特定条件下,每种切换都具有优势。不同类型的硬件可用于实现开关操作,包括机械开关和继电器以及电子开关。当开关操作涉及多个输入或输出时,可以采用不同的方法来实现信号分布,所选择的方法会影响隔离、损耗和复杂性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Headend Signal Switching Techniques
Signal switching has been practiced in CATV headends as a means of achieving better utilization of a limited number of channels and for commercial deletion and non duplication substitution. In designing a headend switching system, several problems need to be addressed. A selection can be made between baseband and IF switching, each having advantages under certain conditions. Different types of hardware are available to implement switching operations, including mechanical switches and relays, and electronic switches. When multiple inputs or output are involved in a switching operation, differing methods may be employed to implement signal distribution, with the method selected affecting isolation, loss, and complexity.
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