| 摘要 |
PURPOSE:To use one vertical bus to make call connection possible by cutting off temporarily a low-potential switch circuit and making it conductive again after the electron intersection element is made conductive. CONSTITUTION:For service connection between telephone sets 501 and 502, low- potential switch circuit 301 and high-potential switch circuit 201 are conductive to make electron intersection element 101 conductive. Next, low-potential switch circuit 301 is cut off temporarily and is switched to the current holding circuit 601 side to not only hold conduction of electron intersection element 101 but also make another electron intersection element 102, which is connected to the bus of the same high- potential switch circuit 201, conductive. Then, low-potential switch circuit 301 is made conductive again, thus supplying a holding current required for service to electron intersection elements on the same bus. |
