| 摘要 |
PURPOSE:To test a dialing function and an interface function easily, by providing an automatic dialing device with a testing device which simulates respective signals. CONSTITUTION:An automatic originating and terminating type network controller NCU forms an interface between a subscriber line and a modem to perform originating or terminating operation automatically. A pseudo NCU20, once a data terminal activates a call request signal CRQ, triggers a monostable multivibrator 26 with specified-time delay. The monostable multivibrator 26 generates a following number request signal PND, which is supplied to an automatic dialing device. As a result, dial data is sent out one after another. The signal PND is generated one after another until a signal showing the end appears, so the dialing function and interface function of the automatic dialing device are tested. |
