一般来说，载波监测系统的建立应符合以下两个原则：一是监测系统的成本造价必须低于被监测设备；
Normally, the establishment of carrier monitoring system follows two principles:its cost must be lower than that of monitored devices;
在光副载波复用(SCM)系统中若使用DOP作为DGD的监测信号将会遇到灵敏度低的问题。
The problem of low sensitivity will become seriously if DOP is used as the monitor signal of DGD in SCM system.
并着重介绍了利用电缆载波和电流监测等多种技术的电缆防盗报警系统。
And introduced the use electric cable carrier and the electric current monitor emphatically and so on many kinds of technical electric cable security alarm systems.
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