| 摘要 |
PURPOSE:To improve the efficiency of test work, by providing a fault testing equipment, which is provided with a shift register for storage of a dial number, a display for status monitor of each control signal, a changeover switch, etc., between a subscriber network control device and an automatic originating adapter. CONSTITUTION:A subscriber's line fault testing equipment 3 sets a channel between a network control device 1 and an automatic originating adapter 2 and has signal terminals which can transmit and receive respective control signals of four-bit dial numbers DS1-DS4, call request CRQ, dial number request DLO, dial number read DPR, next dial number request PND, connection completion DSC, and call abandonment ACL, and a receiver RV and a driver DV are connected to each terminal. A shift register REG is connected to the receiver RV for the terminal of DS1-DS4, and bits stored in the register REG are displayed on a display DISP through a decoder DEC. Light emitting diode PD for status monitor is connected to the driver DV for each control signal. Changeover switches SW1-SW12 are provided on signal lines of each receiver RV and driver DV and are used for the turn-back test. |
