| 摘要 |
PURPOSE:To obtain an exchange provided with a dial in function by providing a dial in control module for storing a dial number and transmitting a signal of completely receiving the number and the received number to a control circuit for controlling the entire of the exchange when the reception of the number is completed. CONSTITUTION:In the dial in control module 5, the reception of call information signal is extracted in an interface circuit 14 and informed to the control circuit 13 through a control information transmitting/receiving part 12. The circuit 13 forms a response signal and feeds to a trunk line attendant board interface circuit through the transmitting/receiving part 12, the circuit 14 and a trunk line attendant board connecting line 7. The circuit 13 makes a PB signal receiver 11 enable to receive the dial number consisting of the PB signal. When the receiver 11 completes the reception of the dial number, it is informed to the circuit 13 and when the circuit 13 detects the completion of the reception of the dial number, it transmits a dial signal receiving completion signal to an attendant board interface circuit through the transmitting/receiving part 12.
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