| 摘要 |
PURPOSE:To obtain a simulation call test system for digital junction lines of a high economic effect, by utilizing an artificial call for subscriber lines for many purposes. CONSTITUTION:When the internal program of a processor 17 in a simulation call device 10 for subscriber line enters into the call starting sequence, the processor 17 closes the loop of an originating subscriber's circuit 11 to set the call start state and sends call start information to a processor 27 in an said call device 20 for junction line through information transmission/receiving circuits 15 and 25. As the result, the processor 27 sends start set information to a digital transmission and receiving control circuit 23, and this information is set to a signal bit train in the circuit 23, and call start information is sent to the other- party exchange through a digital signal transmitting and receiving circuit 22 to start the exchange. After receiving start confirmation information from the exchange side, a connection code is sent to call a terminating subscriber, and the train is confirmed by the receiving of a response signal from the terminating subscriber side, and the processor 27 is released. |
