| 摘要 |
PURPOSE:To effectively use a carrier telephony circuit, by providing a circuit contact-connected to a signal line in the carrier telephony circuit consisting of the parallel setting of a call line and the signal line, and transmitting a bit of information in a nonmodulated pulse string through the signal line. CONSTITUTION:A carrier telephony circuit 15 is constituted by setting a call line 16 and a signal line 17 in parallel. And each of both end parts of the call line 16 is connected directly to the information transmission device of a subscriber respectively. Also, both end parts of the signal line 17 are connected respectively to transmitter-receivers 20 and 21. Connection between those transmitter- receivers 20 and 21, and the signal line 17, is performed by, socalled, a connection bridge through contact coupling circuits 22 and 23 built in each of the transmitter-receivers 20 and 21. And an output information signal from each of the transmitter-receivers 20 and 21 is sent out to the signal line 17 in the form of the non-modulated pulse string, and the bit of information is transferred between the transmitter-receivers 20 and 21. Therefore, it is possible to transmit information signals separately by the call line 16, and the signal line 17.
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