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?4Channel Ethernet interface is switch interface, support VLAN

??Ethernet interface rate is 10/100M,duplex/half duplex adaptive

??Can command the remote interface loop back to maintain the circuit

?The transmission distance is up to 2-120Km without interruption

??AC 220V, DC-48V, DC24V can be optional

??DC-48V/DC24V power has polarity automatic detection function, you can install the device without differentiation between positive and negative polarity.