| 摘要 |
PURPOSE:To elevate the working efficiency of an originating register without causing an erroneous connection, by providing a relay for monitoring the continuation of receiving of a multifrequency signal, to the originating register. CONSTITUTION:When an extension subscriber calls, it is connected to an originating register, thereafter, when a trunk line originating operation is executed, a multifrequency signal receiver receives it, and it is stored in a dial information storage circuit 80. As a result, it is decided as trunk line outgoing by a pretranslation circuit 81, a central control device starting relay 82 is energized, and also a contact 90 is closed. On the other hand, while a multifrequency signal is being received continuously, the contact 76a of a monitor relay 76 is closed, therefore, the central control device is not started. Accordingly, erroneous connection is not caused. In case of connecting each extension, the connection of each extension is decided by the pretranslation circuit 81, therefore, the contact 90 remains in opening. Accordingly, when the final digit of an extension number is received, the central control device starting relay 82 is energized immediately. |
