| 摘要 |
PURPOSE:To realize an easy-to-handle false calling device by providing the outgoing terminal identification signal transmission means which displays the outgoing side to the outgoing terminal function circuit. CONSTITUTION:The function, which transmits the outgoing terminal identification signal displaying the outgoing side from pulse transmission circuit OS105 via hybrid circuit HYB109, is provided to outgoing terminal function circuit 101. And when incoming terminal function circuit TTL102 receives the incoming and gives the answer with reception of the outgoing terminal identification signal, the function has the self-return immediately or after a fixed time. In case the reception of the outgoing terminal identification signal is impossible, the function has the self-return after a fixed time longer than the time when the identification signal is received. In such way, the self-control deciding function formed by the simple means is added to TTL102 in order to constitute an easy-to-handle false calling device. |
