| 摘要 |
PURPOSE:To establish the transfer signal generation circuit of small size and high reliability, by making the circuit with solidstate constitution, through the use of semiconductor logic circuit elements such as astable multivibrator, monomultivibrator and switching elements. CONSTITUTION:When a failure in the reception line is detected at the reception station having multiplex carrier telephne terminal station unit, the input of the frequency generation circuit 3 is grounded. The frequency generation circuit 3 having astable multivibrator is oscillated at the rectangular wave of the fundamental frequency to trigger the pulse width adjusting circuit 4 having the monostable multivibrator at the next stage resulting in being set to the specified pulse width, and the transfer signal is transmitted by using the transmission line of the reception station by turning ON and OFF the switching circuit 5 including the relay. Further, the display of the failure is made to the reception side of the transmission station to inform the cause to the failure on the transmission line at the transmission station. |
