| 摘要 |
PURPOSE:To make effective use the processing time and to increase the processing ability, by storing the average call production interval with calculation and performing the test instruction display to the subscriber only when the next call is absent more than the interval. CONSTITUTION:A charging information detection circuit 4 is connected to the subscriber line 2 tying between the subscriber circuit 1 and the exchanger 3, and the charging information detected at the detection circuit 4 is fed to a call production interval detection circuit 5 detecting the interval of call production. The information of the call production interal detected at the detection circuit 5 is stored in a memory circuit 6 and an arbitrary value is fed from an external call production interval set circuit 7 externally every subscriber to this circuit 6. Further, the average call production interval stored in the circuit 6 is fed to a comparison circuit 8, and it is compared with the call production interval of the detection circuit 5 obtained from the input of next call, and if the next call is absent more than the average call production interval, it is displayed on the display circuit 9 and an instruction is given to the test circuit 10 to perform test for the circuits including the detection circuits 4 and 5. |
