| 摘要 |
PURPOSE:To enable the remote control when no personnel is present at the master station, by the control from the station coupling the connumication signal from the first to the second line, in the connection of information telephone network for communication line. CONSTITUTION:The information telephone line used for the maintenance of communication lines consists of the first and second maintenance telephone lines 4 and 5, and the line 4 is not connected to the intermediate terminal stations E and Q to constitute independent communication sections, from the terminal station A to the E, from F to P, and from Q to V. The communication for the entire sections can be made by providing the means of coupling, as required, for the independent communication sections at the terminal stations C, M and Q as the line 5. As the means, the upward and downward communication lines 7, 8 of the first line are provided with the hybrid network circuit 11, and the circuit 11 is connected to the upward and downward communication lines 9 and 10 of the second line via the switch 15, and further, the receiver 12, transmitter 13 and signal detector 14 are connected via the circuit 11 to control the stations A-V to couple the communication signal. |
