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This is the video about Audio Frequency Junctions & Trunk Circuits Phantom Circuit for DC Signalling over four-wire audio frequency line. Loop/Disconnect Signalling, LDDC Signalling System, Long Distance DC Signalling.
This is the video about Audio Frequency Junctions & Trunk Circuits Phantom Circuit for DC Signalling over four-wire audio frequency line. Loop/Disconnect Signalling, LDDC Signalling System, Long Distance DC Signalling.
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