The red bell as shown above indicates and alarm condition is active.
而黄色警钟（屏幕上未显示）则显示敬告状态已激活。
The monitor is set to activate an alarm condition anytime the CO level exceeds 10 ppm (5 ppm in Canada).
一氧化碳水平超过百万分之10 就会发出警报。
SONET interfaces must not report an increase in BIP errors during a loss of signal or loss of frame alarm condition.
SONET接口必须在增加过程中的信号损失或丢失帧报警条件的BIP错误报告。
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