| 摘要 |
PURPOSE:To keep the synchronism between an exchange and a data service unit by allowing a data communication interface circuit to conduct a prescribed operation when the exchange restarts with a fault of the data communication interface circuit. CONSTITUTION:When the exchange restarts due to a fault of central processing circuit 10 of a data communication interface circuit 2, the interface circuit 2 transmits a line initializing request signal to a data service unit 3. Thus, the synchronism is obtained between the exchange 1 and the service data unit 3. The synchronism between the exchange and the data service unit is kept in such a way. |
