I inserted the wrong control board in the OLT, these types of control board this OLT does not support. After that, the fans started working very fast and making a lot of noise. After that, I replaced the control board. This type of control board is correct for this type of OLT. However, the fans still do the same thing - very quickly and make a lot of noise. Is the solution command: #fan speed mode manual ... and reduce fan speed?
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