| 摘要 |
PURPOSE:To simplify the circuit constitution and reduce the size of the false call unit greatly by giving the control to each action of the false call unit as well as the oscillation start and stop of the false call unit via the transmission signal sent from the channel of the exchange. CONSTITUTION:The false call generation control to generate the false call with the control given from terminal unit 38 is given to the communication exchange circuit network of exchange 30. In this case, false circuits LNO, LN1-LNn which are connected via the same interface as that of circuit correspondence part 36 are provided to circuit process part 34 of exchange 30. False call unit 42 features the function to given the false action via circuits LNO-LNn to the subscriber unit and the trunk unit against exchange 30. Here the transmission signal sent from channel 32 of exchange 30 gives the control to the start/stop of transmission of unit 42 plus each action of unit 42. As a result, the circuit constitution can be simplified, at the same time reducing greatly the size of the false call unit. |
