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T O P I C R E V I E W
hankypanky
Posted - Apr 24 2007 : 02:43:36 AM Hi,
I have been looking for a circuit that detects only on-hook/off-hook detection. But the circuit is not either on the subscriber (FXO) or central office (FXS) side (not on the edges of the tip/ring pair), it sits between them. The only requirement is to detect on-hook/off-hook states at the subscriber side. Can anyone has info on this topic?
Posted - Apr 24 2007 : 08:10:04 AM On-hook, a telephone draws no DC current. Off-hook it draws DC current. Simply make a DC current detector for each line.