American Fibertek SMH10p-PoE - Manual (Page 26)

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3.5 Wiring the Fault Alarm Contact
The fault alarm contacts are in the middle of the terminal block connector as the picture
shows below. Inserting the wires, the switch will detect the fault status of the power
failure, or port link failure (available for managed model) and then forms an open circuit.
The following illustration shows an application example for wiring the fault alarm contacts.
[NOTE] The wire gauge for the terminal block should be in the range between 12 ~ 24
AWG.
Insert the wires into the fault alarm contacts