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for Transmission Input Power Input Shunt (if available) Control Panel Line Fault output Relay (contacts closed to halt radio transmissions) Bell I Alarm output LED Status Indicators (Grn)(Red) AC DC ON / ON OFF / ON Indication AC input is on / DC output is on. Normal. AC input is off / DC output is from Battery only. Step down Transformer is defective or unplugged, or the AC outlet is off. Battery will eventually discharge. ON /OFF AC input is on / DC output is off. The auto-reset ove