CORDLESS TELEPHONE SYSTEM
PURPOSE:To solve such a problem as an incoming is not transferred even if it comes to a line wire by resetting automatically a slave station to a receiving holding state, in the case a dial operation is not executed within a prescribed time after a circuit of the slave station and the line wire is f...
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Format: | Patent |
Sprache: | eng |
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Zusammenfassung: | PURPOSE:To solve such a problem as an incoming is not transferred even if it comes to a line wire by resetting automatically a slave station to a receiving holding state, in the case a dial operation is not executed within a prescribed time after a circuit of the slave station and the line wire is formed. CONSTITUTION:When only an answer switch 64 is operated in a slave station and only a tone signal f2 is transmitted to a master station, a circuit between a line wire and the slave station if formed, and simultaneously, an AND gate A13 of a reset circuit 37 of the master station is opened and a timer circuit 39 is actuated. When this timer circuit 39 executes time counting for a prescribed time and generates a pulse, an AND gate A14 is opened and a transistor Q8 is allowed to conduct, a relay RY-8 is excited and a relay contact is closed, and a tone signal f5 is generated. The slave station detects the tone signal f5, resets a flip-flop FF-9 and sets it to a receiving holding state. In such a way, in the case a dial operation is not executed within a prescribed time after the circuit of the slave station and the line wire is formed, the circuit can be cut off automatically, and such a problem as even if an incoming call comes to the line wire, it is not transferred can be solved. |
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