同轴电缆与光纤传输哪个好？安防市场向来不缺乏"战争"，前端监控摄像机模拟与高清的PK战仍在持续，而后端NVR与DVR不知何时也加入了这场无硝烟的战争中。更令人诧异的是，就连二者的传输方式也纷纷表态"站队"，力挺自己的队友。模拟与高清监控对应着同轴电缆与光纤传输，这仍旧是一场没有结局的对抗。

在视频传输系统中，摄像机的输出阻抗为75Ω，在CCTV工程中视频信号的传输主要用绝缘层为实心的聚乙烯SYV型同轴电缆，和绝缘层为泡沫聚乙烯SBYFV型同轴电缆。这两种电缆特性阻抗均为75Ω，在衰减量方面后者也比前者小。

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