| 摘要 |
PURPOSE:To constitute the space division type channel switch for the electronic exchange in such a way that the switch can be reset to the original state as long as the contents of the memory circuit has no change even the contents of the switch may change due to the external noise. CONSTITUTION:Detecting circuit 9 and 10 to detect the presence or absence of the holding current for switches 3-6, memory circuit 15 to memorize the connection pattern of the switch matrix, driving circuit 1 and 2 for switches 3-6, and holding current cut-off circuit 7 and 8 for switches 3-6 are provided for switches 3-6 of the space division type channel in the electronic exchange. Thus, the connection pattern of circuit 15 is compared with the detection result of the presence of the holding current for circuit 9 and 10. When no coincidence is obtained with the comparison result, circuit 1 and 2 plus circuit 7 and 8 are designated and driven by designation circuit 11 of the driving line and designation circuit 13 of the cut-off circuit in order to secure a coincidence between the connection state of the switch matrix and the connection pattern of circuit 15. |
