| 摘要 |
The extension ring signal controller comprises positive operation power supply means coupled to the positive power of a general telephone, a controller coupled to a ring signal generator, first relay means coupled to the positive power of the general telephone, the ring signal generator, the controller and a transformer and switched to the positive power of the general telephone by the ring signal generator and transformer according to the control of the controller, second relay means coupled to the positive operation power supply means and controller and switched according to the controller, and a line state detector coupled to the positive power of the general telephone and the relay means and detecting a dial pulse transmitted, thereby simplifying circuit configuration.
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