| 摘要 |
PURPOSE:To automate a channel loop test by using a ringing signal transmitted to a subscriber line, driving a relay circuit thereby transmitting the output of an oscillating circuit to the subscriber line. CONSTITUTION:When a channel and a slave station 8 are designated in a controller 3 and a call test mode of the slave station 8 is set, a call is fed from a master station 2 to the slave slave station 8 and the ringing signal is transmitted to the subscriber line 14. This signal is fed also to an automatic response device 13, a call tone is returned automatically to the master station 2 via the subscriber line 14 to attain the confirmation of line connection. |
