Whether it is normal that the fan status indicator of the USG6660 blinks green every two seconds

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If the FAN STATUS indicator is blinking green every two seconds (0.5 Hz), the new fan module works properly.

Other related questions:
Why the Fan Module Indicator is blinking green faster than usual?
The fan is working properly but not communicating with the MPU normally.

Indication of LOS indicator blinking at an interval of 3 seconds on Metro 100
If the LOS indicator blinks at an interval of 3 seconds, an MS_RDI alarm is detected on the LOS port. When this occurs, you need to check whether the LOS, LOF, and B2 alarms are generated on the peer port.

Meaning of colors of interface indicators on the S1700
For details about the meaning of each color of the indicators on the S1700, click S1700 Products Description and choose Hardware Structure > Indicator.

Why the Fan Module Indicator is blinking red ?
An alarm has been generated and needs to be handled. Possible causes of the alarm include errors of dual in-line package (DIP) switches, short-circuit, fan blades blocked, and fault of the fan module.

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