Frequently it’s required to have some way to know whether or not you have AC power, or whether you’re on battery. A common trick on Mikrotik is to monitor the input voltage. When, however, you have a good DC UPS rather than running straight off the batteries this hack simply isn’t available (of course a really good unit will have SNMP and traps hopefully), or if you have some other router which can’t provide you the input voltage.
Enters the Ethernet AC switch, backed by an AC relay.
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