| 摘要 |
PURPOSE:To make easy the restriction of call out, by performing normal monitor of the subscribing line through the use of memory circuit. CONSTITUTION:The condition of the subscriber is always monitored with L realy and it is transferred to the processor via the scanner with the AND elements 1 and 2, and when transmission is made, FF4 is set with the processor and the output closes the AND element 3, making ineffective the call out restriction information after the terminal LC. Further, when the call out is ended, FF4 is reset with the processor, making effective the element 3 resulting in restricting the transmission from the next. In the incoming call to the subscriber under the restriction of call out, FF4 is set at incoming call, the element 3 is closed, ignoring the restriction of call. Accordingly, only new call is restricted and other calls are monitored. |
