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In the operate mode, the outputs are connected and the SFP-1 operates normally. B-Power Indicator LED - This LED lights when the SFP-1 is on and receiving power from the AC source. It will flash at one second intervals during warmup delay and muting. C-Power Switch - This toggle switch, when in the ON position, allows the SFP-1 to receive power, rendering the SFP-1 operational as indicated by the Power Indicator LED (B). When the switch is in the OFF position the SFP-1 is not receiving power and