What exactly is the fan symbol above that small hole on the back?

None of the PDF's on the Promise website say anything about it, either...?

PROMISE SANLink3 T1 NBASE-T Ethernet Interface

PROMISE SANLink3 T1 NBASE-T Ethernet Interface

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1 Answer from the Community

  • Answer

    AFAICT without owning one, underneath the symbol is a small LED which lights up if the small fan inside the device turns itself on to cool down. I read somewhere that the fan is near quiet anyway, so nothing to worry about.